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ANSI B29.1
Part Number Example:
140TL32.3535ANSI
140 = No. 140 Roller Chain Sprocket (D140 = Double, T140 = Triple)
TL = Taper Lock Type Bushing
32 = 32 Teeth (32H = 32 Hardened Teeth)
3535 = 3535 Taper Lock Bushing
Note ANSI refers to American Standard Unified Threads used in North America. ANSI Bushings use ANSI 1/2-13 UNC (American) threads. They differ from 1/2 inch BSW (British Standard Whitworth thread) 1/2" x 12tpi BSW used in Europe, and are not interchangeable with 1/2 inch ANSI threads.
Only bushing sizes 2517, 3525 and 3535 use 1/2 inch non-interchangeable ANSI threads.
PDF - Sprockets-AmericanStandardforTaper-LockTypeBushings.pdf
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