![[Tsubaki] — BS85 Series Backstop Cam Clutch (Conveyor, Medium (BS65~85))](https://img.prosourcemro.com/2026/05/001-305-1024x1024.png)
Cam Clutches
TSUBAKI
[Tsubaki] — BS85 Series Backstop Cam Clutch (Conveyor, Medium (BS65~85))
Family ID: TSB-BS85
Tsubaki Cam Clutch BS Series — backstop clutch exclusively for conveyor reverse-rotation prevention (low-speed use). BS-HS Series also available with improved maximum free-running speed and allowable torque. Torque range: 94~980,000 N·m (30~100,000 kgf·m). Keyway type: J = new JIS standard / E = old JIS type 2. Torque arm (TA) and safety cover (SC) available as accessories.
4 product codes available in this family
Product Codes & Specifications
| Product Code | Description | Brand | Spec | ||
|---|---|---|---|---|---|
| BS85-70J | BS85 — Bore Ø70 mm (J-type keyway) | Tsubaki | Series: BS85 | Type: Backstop Cam Clutch — Conveyor Reverse Prevention | Torque Range: 94~980,000 N·m (30~100,000 kgf·m) | Speed: Low-speed use | Keyway: J = New JIS Standard / E = Old JIS Type 2 | BS-HS Series: Enhanced free-running speed and torque available on request | Application: Conveyor backstop, incline conveyor reverse-rotation prevention | Bore: Ø70 mm | Keyway: J (New JIS Standard) | ||
| BS85-75J | BS85 — Bore Ø75 mm (J-type keyway) | Tsubaki | Series: BS85 | Type: Backstop Cam Clutch — Conveyor Reverse Prevention | Torque Range: 94~980,000 N·m (30~100,000 kgf·m) | Speed: Low-speed use | Keyway: J = New JIS Standard / E = Old JIS Type 2 | BS-HS Series: Enhanced free-running speed and torque available on request | Application: Conveyor backstop, incline conveyor reverse-rotation prevention | Bore: Ø75 mm | Keyway: J (New JIS Standard) | ||
| BS85-80J | BS85 — Bore Ø80 mm (J-type keyway) | Tsubaki | Series: BS85 | Type: Backstop Cam Clutch — Conveyor Reverse Prevention | Torque Range: 94~980,000 N·m (30~100,000 kgf·m) | Speed: Low-speed use | Keyway: J = New JIS Standard / E = Old JIS Type 2 | BS-HS Series: Enhanced free-running speed and torque available on request | Application: Conveyor backstop, incline conveyor reverse-rotation prevention | Bore: Ø80 mm | Keyway: J (New JIS Standard) | ||
| BS85-85J | BS85 — Bore Ø85 mm (J-type keyway) | Tsubaki | Series: BS85 | Type: Backstop Cam Clutch — Conveyor Reverse Prevention | Torque Range: 94~980,000 N·m (30~100,000 kgf·m) | Speed: Low-speed use | Keyway: J = New JIS Standard / E = Old JIS Type 2 | BS-HS Series: Enhanced free-running speed and torque available on request | Application: Conveyor backstop, incline conveyor reverse-rotation prevention | Bore: Ø85 mm | Keyway: J (New JIS Standard) |
