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Set Screw Hub - 1/4" Bore
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Price: $8.14
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Sparkfun Item #: ROB-12488 -

"Set screw hubs offer a cheap way to attach hub mount gears or wheels to a shaft. The hub offers 4 equally spaced 6-32 tapped holes utilizing the 0.77" hub pattern and is precision machined from 6061 T6 aluminum. The set-screw is 10-32 and uses a 3/32” hex key. This hub has a ¼" bore. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics...

Bearing Mount - Flat (1/4" Bore)
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Price: $9.77
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Sparkfun Item #: ROB-12328 -

"These flat bearing mounts attach to the face of a channel or plate and have a ball bearing with a 1/4” bore for shafts. They can be used in conjunction with angle brackets to be mounted inside channels or in other configurations. These bearing mounts have a width of 1.31”, a thickness of 0.20”, a 0.25” bore bearing, and utilize the 1.5” hub pattern. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball...

Timing Pulley - Shaft Mount (10T; 6mm Bore)
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Price: $11.95
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Sparkfun Item #: ROB-12490 -

"These shaft-mountable aluminum timing pulleys use XL timing belts and attach to a 6mm output shaft with a set screw. They have 10 teeth with a gear pitch of 1/5P, an outer diameter of 0.6”, a bore of 6mm, and requires a belt width of 3/8”. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components can be intuitively connected together....

Set Screw Hub - 5mm Bore
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Price: $8.14
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Sparkfun Item #: ROB-12404 -

"Set screw hubs offer a cheap way to attach hub mount gears or wheels to a shaft. The hub offers 4 equally spaced 6-32 tapped holes utilizing the 0.77" hub pattern and is precision machined from 6061 T6 aluminum. The set-screw is 10-32 and uses a 3/32” hex key. This hub has a 5mm bore. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components...

Set Screw Hub - 6mm Bore
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Price: $8.14
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Sparkfun Item #: ROB-12318 -

"Set screw hubs offer a cheap way to attach hub mount gears or wheels to a shaft. The hub offers 4 equally spaced 6-32 tapped holes utilizing the 0.77" hub pattern and is precision machined from 6061 T6 aluminum. The set-screw is 10-32 and uses a 3/32” hex key. This hub has a 6mm bore. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components...

Shaft Coupler - 1/4" to 6mm
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Price: $8.14
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Sparkfun Item #: ROB-12211 -

"These stainless steel shaft couplers allow you to couple two size shafts together. They can be used for connecting motor shafts to drive shafts, or two different-sized shafts. These shaft couplers have a length of 0.75”, a outer diameter of 0.42”, and couple 1/4” to 6mm shafts. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics...

Timing Belt - XL (per foot)
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Price: $6.58
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Sparkfun Item #: ROB-12156 -

"These are resistant XL sized timing belts that fit snug inside of the Actobotics timing pulleys. Each belt is made out of neoprene with fiberglass cords running its length to provide a fair ammount of strength and durability. The timing belts have a width of 3/8", a length of 12", and a 1/5P. Note: This belt is sold by the foot in custom lengths. No returns will be accepted for custom cut lengths. Dimensions: Length - 12" Width - 3/8" Pitch - 1/5 Documents: Product Page (615152) Product Video...

Shaft - D-Shaft (Stainless; 1/4"D x 3.00"L)
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Price: $3.25
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Sparkfun Item #: ROB-12473 -

"These 3" long stainless steel D-Shafts have a diameter of ¼". The flat edge that runs the length of the shaft makes it an ideal drive shaft, when used with a gear, pulley, or even a shaft coupler. Dimensions: Length - 3” Diameter - 1/4” Flat Edge Width - 0.16" "

Hub Arm - Double (6")
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Price: $21.18
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Availability: Out of Stock
Sparkfun Item #: ROB-12413 -

"These aluminum double servo hub arms can bolt directly to the aluminum hub on servo power gearboxes via four 6-32 x 3/8" machine screws. Each double hub arm has a length of 6” and utilizes the 0.77” hub pattern. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components can be intuitively connected together. The wide range of components...

Bearing Mount - Flat (3/8" Bore)
Price: $10.58
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Availability: Out of Stock
Sparkfun Item #: ROB-12260 -

"These flat bearing mounts attach to the face of a channel or plate and have a ball bearing with a 3/8” bore for shafts. They can be used in conjunction with angle brackets to be mounted inside channels or in other configurations. These bearing mounts have a width of 1.31”, a thickness of 0.20”, a 0.375” bore bearing, and utilize the 1.5” hub pattern. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and...

Bearing Mount - Flat (5/8" Bore)
Price: $12.21
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Availability: Out of Stock
Sparkfun Item #: ROB-12554 -

"These flat bearing mounts attach to the face of a channel or plate and have a ball bearing with a 5/8” bore for shafts. They can be used in conjunction with angle brackets to be mounted inside channels or in other configurations. These bearing mounts have a width of 1.31”, a thickness of 0.20”, a 0.625” bore bearing, and utilize the 1.5” hub pattern. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and...

Bearing Mount - Pillow Block (1/4" Bore)
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Price: $9.77
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Availability: Back Order
Sparkfun Item #: ROB-12333 -

"Pillow block bearing mounts attach to the outside of a channel and can be used as simple hinges. These bearing mounts have a width of 1.32”, a thickness of 0.25”, a 0.25” bore bearing. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components can be intuitively connected together. The wide range of components makes building...

Bearing Mount - Pillow Block (3/8" Bore)
Price: $10.58
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Availability: Out of Stock
Sparkfun Item #: ROB-12100 -

"Pillow block bearing mounts attach to the outside of a channel and can be used as simple hinges. These bearing mounts have a width of 1.32”, a thickness of 0.25”, a 0.375” bore bearing. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components can be intuitively connected together. The wide range of components makes building...

Bearing Mount - Pillow Block (5/8" Bore)
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Price: $12.21
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Sparkfun Item #: ROB-12541 -

"Pillow block bearing mounts attach to the outside of a channel and can be used as simple hinges. These bearing mounts have a width of 1.32”, a thickness of 0.25”, a 0.625” bore bearing. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components can be intuitively connected together. The wide range of components makes building...

Cable Carrier - 10x15mm (0.5m Length)
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Price: $17.86
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Sparkfun Item #: ROB-13207 -

"No, this isn’t a tank tread, this is a 0.5m long Cable Carrier with 10x15mm bits composing its main body and two screw fasteners at each end for efficient mounting. Sometimes called a “drag chain,” each carrier can be used in projects with a large number of moving parts to protect internally installed cables, pipes, or tubes so they can be bent and moved while remaining protected. Cable carriers can most commonly been found in 3D printers and CNC machines but they can be...

Clamping Hub - 1/4" Bore
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Price: $13.03
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Sparkfun Item #: ROB-12238 -

"These clamping hubs are a great and cost-effective choice when attaching hub mount gears or wheels to shafts or tubes and can be a better option than set screw hubs if you don’t want to risk damaging whatever you need clamped. These clamping hubs have a ¼" bore, four 6-32 tapped holes, one 6-32 machine screw for tightening, and utilizes the 0.77" hub pattern. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball...

Clamping Hub - 4mm Bore
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Price: $13.03
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Sparkfun Item #: ROB-12455 -

"These clamping hubs are a great and cost-effective choice when attaching hub mount gears or wheels to shafts or tubes and can be a better option than set screw hubs if you don’t want to risk damaging whatever you need clamped. These clamping hubs have a 4mm bore, four 6-32 tapped holes, one 6-32 machine screw for tightening, and utilizes the 0.77" hub pattern. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings....

Clamping Hub - 5mm Bore
Price: $13.03
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Availability: Out of Stock
Sparkfun Item #: ROB-12361 -

"These clamping hubs are a great and cost-effective choice when attaching hub mount gears or wheels to shafts or tubes and can be a better option than set screw hubs if you don’t want to risk damaging whatever you need clamped. These clamping hubs have a 5mm bore, four 6-32 tapped holes, one 6-32 machine screw for tightening, and utilizes the 0.77" hub pattern. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings....

Clamping Hub - 6mm Bore
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Price: $13.03
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Sparkfun Item #: ROB-12264 -

"These clamping hubs are a great and cost-effective choice when attaching hub mount gears or wheels to shafts or tubes and can be a better option than set screw hubs if you don’t want to risk damaging whatever you need clamped. These clamping hubs have a 6mm bore, four 6-32 tapped holes, one 6-32 machine screw for tightening, and utilizes the 0.77" hub pattern. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings....

Gear - Hub Mount (64T; 0.5" Bore)
Price: $21.18
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Availability: Out of Stock
Sparkfun Item #: ROB-12265 -

"These hub-mountable aluminum gears are ideal for transmitting motion from a motor or servo to a wheel or shaft. These gears have 64 teeth with a gear pitch of 32P, an outer diameter of 2.063”, a bore of 0.50”, and utilizes the 0.77” and 1.5" hub pattern. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components can be intuitively...

Gear - Hub Mount (72T; 0.5" Bore)
Price: $21.18
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Availability: Out of Stock
Sparkfun Item #: ROB-12368 -

"These hub-mountable aluminum gears are ideal for transmitting motion from a motor or servo to a wheel or shaft. These gears have 72 teeth with a gear pitch of 32P, an outer diameter of 2.312”, a bore of 0.50”, and utilizes the 0.77” and 1.5" hub pattern. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components can be intuitively...

Gear - Hub Mount (84T; 1.0" Bore)
Price: $21.18
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Availability: Out of Stock
Sparkfun Item #: ROB-12206 -

"These hub-mountable aluminum gears are ideal for transmitting motion from a motor or servo to a wheel or shaft. These gears have 84 teeth with a gear pitch of 32P, an outer diameter of 2.688”, a bore of 1”, and utilizes the 1.5” hub pattern. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components can be intuitively connected...

Gear - Pinion Gear (16T; 6mm Bore)
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Price: $21.18
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Availability: Back Order
Sparkfun Item #: ROB-12248 -

"These pinion gears attach to a 6mm D-shaft or gear motor using a setscrew. These gears have 16 teeth with a gear pitch of 32P, an outer diameter of 0.563”, and a bore of 6mm. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components can be intuitively connected together. The wide range of components makes building complex electromechanical...

Gear - Pinion Gear (20T; 0.25" Bore)
Price: $21.18
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Availability: Out of Stock
Sparkfun Item #: ROB-12529 -

"These pinion gears attach to a ¼” D-shaft or gear motor using a setscrew. They have 20 teeth with a gear pitch of 32P, an outer diameter of 0.688”, and a bore of 0.25”. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components can be intuitively connected together. The wide range of components makes building complex...

GoPro Hero 2 Camera Mount
Price: $16.29
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Availability: Out of Stock
Sparkfun Item #: ROB-12467 -

"These GoPro camera mounts provide you with a simple and lightweight way to attach your Hero or Hero 2 to you Actobotics project. Each camera mount can be mounted in any direction and can be attached to any channel, hub mount, or servo block that utilizes the 0.77" hub pattern. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components can be...

Hub Adapter - 1.50" to 1.50"
Price: $6.51
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Availability: Out of Stock
Sparkfun Item #: ROB-12129 -

"This hub adapter lets you connect Actobotics parts with a 1.5" hub pattern to parts with a 1.5" hub pattern. The hole alternate between tapped and untapped, which makes mating two components easy. These adapters are ideal for mounting two different hub patterns: mating hubs to gears, sprockets, or wheels. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all...

Hub Mount - 90 Degrees
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Price: $8.14
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Sparkfun Item #: ROB-12102 -

"These 90 degree hub mounts mate directly to Actobotics channels in multiple positions and are useful as attachment points for shafts and tubes with a 0.5" diameter. Each hub mount has two 0.5" bores and utilize the 0.77" hub pattern. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components can be intuitively connected together. The wide range of...

Hub Mount - Quad (Mount B)
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Price: $8.14
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Sparkfun Item #: ROB-12255 -

"These quad hub mounts can attach to the end or the middle of Actobotics channels to provide you a 90 degree angle with additional attachment points for Actobotics project. These hub mounts have a width of 1.32”, a thickness of 0.25”, a 0.50” bore, and utilize the 0.77” hub pattern. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all...

Hub Spacer - 1"
Price: $3.25
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Availability: Out of Stock
Sparkfun Item #: ROB-12421 -

"These ½" bore hub spacers allow you to space your sprocket, gear, wheel, or other attachment from the mating hub. These hubs utilize the 0.77" hole pattern common throughout Actobotics. This spacer is 1" thick. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components can be intuitively connected together. The wide range of components makes...

Motor Mount - C Style
Price: $8.14
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Availability: Out of Stock
Sparkfun Item #: ROB-12168 -

"The C Style Motor Mount is a low-profile mount for your standard or precision gear motors. Two screws secure your motor while 2 tapped 6-32 holes allow you to connect to Actobotics channels, or other mounts, hubs, or adapters.These mounts fit flush against channels making them ideal for driving gears or pulleys. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all...

Motor Mount - Swivel Clamp (32mm)
Price: $9.77
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Availability: Out of Stock
Sparkfun Item #: ROB-12180 -

"This motor mount connects to other Actobotics products with a swivel mount, allowing you to easily attach your motor to gears or pulleys. A set screw on the swivel mount (sold separately below) allows you to position the motor accurately and lock in its position. You can even rotate the motor inside the mount by loosening the set screw. All these adjustments make for a very versatile mount. This mount works with motors with a 32mm body diameter. Actobotics is a robotics building system based...

PVC Clamp Hub B - 1.315"
Price: $17.08
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Availability: Out of Stock
Sparkfun Item #: ROB-12592 -

"This PVC clamp mount has a 1.315" bore, providing an easy way to incorporate standard 1" PVC pipe into your next project. Two set screws secure to the end of a 1" pipe, and 4 tapped 6-32 holes at the other end make for attachment points to hubs or other Actobotics products. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components can be...

PVC Clamp Mount - 1.315"
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Price: $11.95
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Availability: Back Order
Sparkfun Item #: ROB-12591 -

"This PVC clamp mount has a 1.315" bore, providing an easy way to incorporate standard 1" PVC pipe into your next project. A set screw secures the pipe while 2 6-32 tapped holes provide attachment points to additional parts. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components can be intuitively connected together. The wide range of components...

ServoBlock Kit - Hitec Standard (Hub Shaft)
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Price: $44.01
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Availability: Back Order
Sparkfun Item #: ROB-12347 -

"ServoBlocks increase a servo’s load-bearing capabilities by helping to isolate the lateral load from the servo spline and case. The extreme versatility of ServoBlocks allow users to create complex, extremely rigid, structures with ease using standard Hitec servos. The 1/2” aluminum hub shaft provides multiple mounting options using 6-32 screws. The robust 6061 T-6 aluminum framework acts as a servo exoskeleton, greatly enhancing the mechanical loads the servo can withstand. Our...

ServoBlock Kit - Hitec Standard (Plain Shaft)
Price: $40.75
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Availability: Out of Stock
Sparkfun Item #: ROB-12203 -

"ServoBlocks increase a servo’s load-bearing capabilities by helping to isolate the lateral load from the servo spline and case. The extreme versatility of ServoBlocks allow users to create complex, extremely rigid, structures with ease using standard Hitec servos. Using a clamping hub (not included) on the 1/2” aluminum servo shaft provides an easy way to adjust the position of the component attached to the ServoBlock. The robust 6061 T-6 aluminum framework acts as a servo...

Set Screw Hub - 1/2" Bore
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Price: $8.14
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Availability: Back Order
Sparkfun Item #: ROB-12494 -

"Set screw hubs offer a cheap way to attach hub mount gears or wheels to a shaft. The hub offers 4 equally spaced 6-32 tapped holes utilizing the 0.77" hub pattern and is precision machined from 6061 T6 aluminum. The set-screw is 10-32 and uses a 3/32” hex key. This hub has a ½" bore. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics...

Set Screw Hub - 1/8" Bore
Price: $8.14
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Availability: Out of Stock
Sparkfun Item #: ROB-12108 -

"Set screw hubs offer a cheap way to attach hub mount gears or wheels to a shaft. The hub offers 4 equally spaced 6-32 tapped holes utilizing the 0.77" hub pattern and is precision machined from 6061 T6 aluminum. The set-screw is 10-32 and uses a 3/32” hex key. This hub has a 1/8" bore. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components...

Shaft - D-Shaft (Stainless; 1/4"D x 12"L)
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Price: $7.65
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Availability: Back Order
Sparkfun Item #: ROB-12548 -

"These 12" long stainless steel D-Shafts have a diameter of ¼". The flat edge that runs the length of the shaft makes it an ideal drive shaft, when used with a gear, pulley, or even a shaft coupler. Dimensions: Length - 12” Diameter - 1/4” Flat Edge Width - 0.16" "

Shaft - D-Shaft (Stainless; 1/4"D x 2.375"L)
Price: $2.76
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Availability: Out of Stock
Sparkfun Item #: ROB-12540 -

"These 2.375" long stainless steel D-Shafts have a diameter of ¼". The flat edge that runs the length of the shaft makes it an ideal drive shaft, when used with a gear, pulley, or even a shaft coupler. Dimensions: Length - 2.375” Diameter - 1/4” Flat Edge Width - 0.16" "

Shaft - Solid (Stainless; 1/2"D x 10"L)
Price: $12.38
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Availability: Out of Stock
Sparkfun Item #: ROB-12359 -

"These 10" long stainless steel shafts have a diameter of ½". These shafts are solid, which makes them an ideal choice for axles. These shafts have a Rockwell Hardness rating of 8 Note: For a drive-shaft, check out d-shafts instead. Dimensions: Length - 10” Diameter - 1/2” "

Shaft - Solid (Stainless; 1/2"D x 5"L)
Price: $6.67
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Availability: Out of Stock
Sparkfun Item #: ROB-12542 -

"These 5" long stainless steel shafts have a diameter of ½". These shafts are solid, which makes them an ideal choice for axles. These shafts have a Rockwell Hardness rating of 8 Note: For a drive-shaft, check out d-shafts instead. Dimensions: Length - 5” Diameter - 1/2” "

Shaft - Solid (Stainless; 1/2"D x 6"L)
Price: $7.81
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Availability: Out of Stock
Sparkfun Item #: ROB-12326 -

"These 6" long stainless steel shafts have a diameter of ½". These shafts are solid, which makes them an ideal choice for axles. These shafts have a Rockwell Hardness rating of 8 Note: For a drive-shaft, check out d-shafts instead. Dimensions: Length - 6” Diameter - 1/2” "

Shaft - Solid (Stainless; 1/2"D x 7"L)
Price: $8.95
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Availability: Out of Stock
Sparkfun Item #: ROB-12466 -

"These 7" long stainless steel shafts have a diameter of ½". These shafts are solid, which makes them an ideal choice for axles. These shafts have a Rockwell Hardness rating of 8 Note: For a drive-shaft, check out d-shafts instead. Dimensions: Length - 7” Diameter - 1/2” "

Shaft - Solid (Stainless; 1/2"D x 8"L)
Price: $10.09
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Availability: Out of Stock
Sparkfun Item #: ROB-12395 -

"These 8" long stainless steel shafts have a diameter of ½". These shafts are solid, which makes them an ideal choice for axles. These shafts have a Rockwell Hardness rating of 8 Note: For a drive-shaft, check out d-shafts instead. Dimensions: Length - 8” Diameter - 1/2” "

Shaft - Solid (Stainless; 1/4"D x 1"L)
Price: $0.96
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Availability: Out of Stock
Sparkfun Item #: ROB-12259 -

"These 1" long stainless steel shafts have a diameter of ¼". These shafts are solid, which makes them an ideal choice for axles. These shafts have a Rockwell Hardness rating of 8 Note: For a drive-shaft, check out d-shafts instead. Dimensions: Length - 1” Diameter - 1/4” "

Shaft - Solid (Stainless; 1/4"D x 2"L)
Price: $1.45
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Availability: Out of Stock
Sparkfun Item #: ROB-12392 -

"These 2" long stainless steel shafts have a diameter of ¼". These shafts are solid, which makes them an ideal choice for axles. These shafts have a Rockwell Hardness rating of 8 Note: For a drive-shaft, check out d-shafts instead. Dimensions: Length - 2” Diameter - 1/4” "

Shaft - Solid (Stainless; 1/4"D x 4"L)
Price: $2.43
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Availability: Out of Stock
Sparkfun Item #: ROB-12165 -

"These 4" long stainless steel shafts have a diameter of ¼". These shafts are solid, which makes them an ideal choice for axles. These shafts have a Rockwell Hardness rating of 8 Note: For a drive-shaft, check out d-shafts instead. Dimensions: Length - 4” Diameter - 1/4” "

Shaft - Solid (Stainless; 1/4"D x 9"L)
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Price: $4.88
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Availability: Back Order
Sparkfun Item #: ROB-12178 -

"These 9" long stainless steel shafts have a diameter of ¼". These shafts are solid, which makes them an ideal choice for axles. These shafts have a Rockwell Hardness rating of 8 Note: For a drive-shaft, check out d-shafts instead. Dimensions: Length - 9” Diameter - 1/4” "