ANSI B29.1
Part Number Example:
DQD80F30Hp>D = Double Strand
QD = QD Type Bushing
80 = No. 80-2 Roller Chain Sprocket
F = F Type QD Bushing
30 = 30 teeth
H = Hardened Teeth
PDF - Sprockets-AmericanStandardforQDTypeBushings.pdf
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