4 Stage Viper-Slide Kit (Belt-Driven, 240mm Slides)


Meet the shorter brother of the 336mm Viper-Slide Kit! Whereas some applications focus on maximizing reach, sometimes your project also needs to play limbo.

Belt Drive

A timing belt adds simplicity and reliability to the drive system. Say goodbye to controlling tension variances with a spring, and hello to quick rigging and excellent consistency from one cycle to the next. Whereas cable has the ability to move about freely when slack is introduced, a belt is limited by its width, and thus easier to tame.


This kit is highly mountable to almost anything goBILDA®. Its extension end boasts a grid-pattern of both thru-holes and threaded holes for the secure attachment of components. We’re talking ServoBlocks™, U-Channel, and more!

Unlimited Direction, Awesome Compactness

This kit’s stable linear motion means you can extend it in whatever direction you choose. It’s capable of a maximum of 696mm of travel (difference between retracted and extended length) while measuring a compact 288mm retracted length.

Motor Compatibility

Just install a motor of your choice to get the Viper-Slide Kit up and running! The kit’s 1201-0043-0005 Quad Block Pattern Mount and 8mm REX Sonic Hub are both super-compatible with whatever goBILDA® 5203 Series Yellow Jacket Planetary Gear Motor you choose.

A 60 Tooth GT2 Pulley drives this kit 120mm per rotation. With a maximum travel distance of 696mm, the kit reaches full extension at ~5.8 rotations of its motor’s shaft.

The fastest motor we recommend is a 13.7:1 (435RPM) gear motor. That ratio can extend all four stages in just under a second! Because of such high potential speed, we recommend using the encoder on the 5203 Series motor to start and stop your kit at appropriate limits.

Don't Forget

Be sure to purchase the 5203 Series Yellow Jacket Planetary Gear Motor of your choice to power this kit. If you are using a REV hub, don't forget to pick up a motor cable adaptor! If you plan to use the motor's encoder (which we highly recommend), you will want an encoder cable.


Weight 1206g (Motor Not Included)
Spool Rotations to Max Extension 2088° (~5.8 Rotations)

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