142 (ISO 28B)

Metric Standard Sprockets Unfinished Bore

DIN 8187

ISO 606 B

BS 228

Part Number Example:

142B34

142 = Single Strand Ametric® Sprocket

(2142 = Double Strand Ametric® Sprocket)

(3142 = Triple Strand Ametric® Sprocket )

(1-3/4 Inch Pitch x 1-1/4 Inch Tooth Width to European/British Standard)

28 B ISO Roller Chain Sprocket

B = With Hub (A = No Hub)

34 = 34 teeth

(34H = 34 Hardened Teeth -- See Flame Hardened Section)

(34SS = 34 Teeth Stainless Steel -- See Stainless Steel Section)

34PM = 34 Teeth Plastic Molded -- See Plastic Injection Molded Section)
PDF - Sprockets-MetricBSMinimumplainbore.pdf