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Double Coil Helical Spring Lock Washers for Wood Structures

ASME B 18.21.3 - 2008 (R2013)

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美标ASME B18.21.3 - 2008 (R2013) ASME18.21 Double Coil Helical Spring Lock Washers for Wood Structures
Nominal Diameter
3/8 1/2 5/8 3/4 7/8 1
d Nominal Size
min
max
dc max
a min
max
H min
w min
n max
t min
0.3750 0.5000 0.6250 0.7500 0.8750 1.0000
0.385 0.510 0.635 0.760 0.885 1.010
0.408 0.535 0.660 0.791 0.915 1.040
0.814 1.035 1.284 1.415 1.808 1.928
30° 30° 30° 30° 30° 30°
35° 35° 35° 35° 35° 35°
0.530 0.530 0.785 0.785 0.860 0.860
0.196 0.243 0.302 0.302 0.437 0.437
0.145 0.145 0.220 0.220 0.229 0.229
0.156 0.156 0.234 0.234 0.250 0.250
①,Washers shall be made from material meeting the chemical composition requirements of the following standards:
a、up to and including 3/4 in. carbon steel -SAE J403 1055-1065(UNS G10550-G10650);
b、7/8 in. and above boron steel -SAE J411 10B55-10B65
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