Finer Power torque Limiter Bronze Bush RTL89-BUSH

These are bronze bushes for the RTL50, RTL65, RTL89, RTL127 and RTL178 torque limiters. The bush carries the centre member, which is your own sprocket, pulley or plate and sits between the friction facings. The centre member is not included with the limiter.

Each size has a bush outside diameter that matches the bore of the centre member (30, 41, 49, 74 and 105mm), and the bush is available in several lengths. It has the minimum number of sprocket teeth for each chain size and bush length.

Where this product is used

• Centre member bearing in RTL series torque limiters
• Replacing a worn bush in a torque limiter
• Fitting a sprocket as the centre member of a torque limiter
• Overload protection on chain and sprocket drives

Features

• Bronze bush for RTL50 to RTL178 torque limiters
• Outside diameter from 30 to 105mm to match the centre member bore
• Bush lengths from 3.8 to 22mm, for each size
• Minimum sprocket teeth for 06B to 24B chain
• Outside diameter tolerance for every size

Key specifications

Sizes available

Choosing the right option

Choose the bush size from the torque limiter size, and the bush length from the thickness of the centre member that sits between the friction facings.

The centre member bore comes in a +0.033 to +0.054mm tolerance, depending on size, against a bush outside diameter tolerance of -0.020 to -0.071mm. The centre member should be machined flat and square on its rubbing surface (Ra 1.6 is recommended), free of rust, scale and oil.

RTL50: 9.525 06B chain needs 20 teeth minimum with the 3.8mm bush; 12.7 08B chain needs 16 teeth minimum with the 6mm bush.

RTL65: 12.7 08B chain needs 20 teeth minimum with the 6mm bush; 15.875 10B chain needs 17 teeth minimum with the 8mm bush.