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Top Tooling American Standard Acme Serrations

For: Pratt Burnerd, Buck, Cushman, S. P. and others

Soft Jaws
Chuck SizePart NumberLength AHeight BWidth CTongue DBolt Size EHole Spacing FKey Slot G
8"7749-220383.75"2.0"1.5".67"1/2"1.25.601"
10"7749-260474.12"2.31"1.75".75"1/2"1.75"1.031"
12"7749-320565.12"2.31"1.75".875"5/8"2.0"1.031"
15", 18" & 20"8140-405336.0"3.31"2.5"1.0"3/4"2.5"1.531"
21"-Up8140-505336.0"3.31"3.0"1.25"7/8"3.0"1.531"
Chuck SizePart NumberHTapped Hole TOffset Pointed
Part Number
Offset Pointed
A
HExtra High
Part Number
Extra High
B
8"7749-220382.12"10-247749-22038OPN/A7749-22038EHN/A
10"7749-260472.12"5/16"-187749-26047OP5.5"3.5"7749-26047EH3.31"
12"7749-320562.87"5/16"-187749-32056OP5.5"3.25"7749-32056EH3.31"
15", 18" & 20"8140-405332.62"3/8"-168140-40533OP7.5"4.25"8140-40533EH4.81"
21"-Up8140-505332.62"3/8"-168140-50533OP7.5"4.25"8140-50533EH4.81"
T-Nuts 
Chuck SizePart NumberLength AHeight BWidth CNeck DBolt Size EHole Spacing FShoulder G
8"2749-024072.0"1.0".94".670"1/2"-131.25".44"
10"2749-024172.5".64".94".678"1/2"-131.75".38"
12"2749-024273.0".74"1.06".802"5/8"-112.0".44"
15", 18" & 20"8130-405313.5".93"1.25".933"3/4"-102.5".55"
21" & Up8130-505314.25"1.18"1.55"1.159"7/8"-93.0".68"
Keys
Chuck SizePart NumberLength AHeight BWidth CNeck DBolt Size E
8"2749-024051.5".38".6".156"10–24
10" & 12"2749-024151.70".5"1.030".25"5/16"-18
12"2749-024252.25".5"1.030".25"5/16"-18
15” & Up8130-405302.87".5"1.530".25"3/8"-16
Hard Top Jaws
Chuck SizePart NumberLength AHeight BWidth CTongue DSlot EBolt Spacing F
8"7749-220363.50"2.0"1.75".67".601"1.25"
10"7749-260424.25"2.50"1.75".75"1.031"1.75"
12"7749-320524.87"2.50"1.75".87"1.031"2.0"
15", 18" & 20"8130-406325.5"3.31"2.5"1.0"1.531"2.5"
21" & Up8130-505326.5"3.31"2.5"1.25"1.531"3.0"