A brake or clutch rivet typically has a 150 degree flat countersunk head. They are recommended for the attachment of friction materials. The countersunk rivet head is designed to mate with the counter bore in the friction material. Industry Standard Brake and Clutch rivets have straight, semi-tubular holes. When a properly designed rivet is matched with a well designed anvil, the rivet will clinch the friction material to the shoe tightly.
Many years ago, brake rivets were produced from (expensive) brass material. The Industry then moved to brass plated steel rivets as they still looked like brass but were much less expensive. By the mid to late 1970’s, most brake shoe manufacturers had switched to zinc with yellow dichromate plating. The zinc-yellow plating still looked like brass yet provided better corrosion resistance than brass plated rivets. Brake and clutch rivets today are produced from low carbon steel and are plated with customer specified zinc with yellow or zinc with clear plating.
Expensive design options:
Taper tubular wall rivets and/or stress relieved rivets (heated after manufacture to soften the rivet) were often specified years ago due to the high rejection rate of the steel used at that time. The taper wall and/or stress relieved rivets permitted this rivet style to clinch over more readily on the raw material that was available at that time. Other expensive tubular hole rivet and other rivet design options are available today; however, the straight semi-tubular hole rivet design remains the most popular and appropriate brake rivet design as it functions well and does not add unnecessary cost to your rivet purchases.
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