What it is / Who it’s for The FingerTech 30T S3M timing pulley is built for combat-robotics teams who want reliable, no-slip belt drives. Designed to mount directly to the F4006 740KV brushless outrunner, it helps you deliver controlled, efficient power to weapons or drivetrains without adding unnecessary mass. How it works Precision-machined from anodized 6061-T6 aluminum, the pulley meshes with 4 mm-wide S3M (3 mm-pitch) timing belts for smooth, positive engagement. The lightweight body reduces rotating inertia while the steel flanges keep the belt centered under shock and side load. What’s included / What you’ll need Pulley with steel flanges and a 4 mm bore; the rotor face mounts via 4× M3 on a 12 mm bolt circle (F4006 pattern). You’ll need a matching 4 mm-wide S3M belt and appropriate M3 hardware for your stack-up. Why this pulley It balances strength, weight, and accuracy—only 13.8 g while standing up to repeated hits. Ideal for beetleweight weapons and compact custom builds where every gram counts but durability still matters. Safety & best practices Before power-up, verify pulley and motor alignment, belt tracking, and tension. Keep debris out of the belt path; foreign material can cause slip or premature wear in match conditions. Learn more / Guides Build a proven weapon drive by pairing this pulley with the FingerTech F4006 motor and 4 mm S3M belts. Need a different mounting style? Compare the 30T S3M no-hub pulley for alternate setups.
