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ASME B18.9 No 3 Square Neck Countersunk

https://youtu.be/8q2yb47BAcc?si=dZeMn0oXGJTmV-Kk

Dimensions of ASME B18.9 No 3 Square Neck Countersunk Head Plow Bolts

Nominal or Basic Bolt Diameter, DDiameter of Full Size Body, EDiameter of Head, AMaximum Feed Thickness, FDepth of Square and Head, SWidth of Square, BMaximum Radius on Corners of Square, R
MaxMinMaxMin. SharpABS Min with flatMaxMin (Basic)MaxMin (Basic)
Regular Head
5/160.3120.2990.6050.5780.5630.0250.2690.2430.3250.3130.031
3/80.3750.360.7080.6710.6560.0310.3120.2810.3870.3750.047
7/160.4380.4210.8260.7810.7660.0360.3640.3280.450.4380.047
1/20.50.4830.9450.890.8750.0420.4170.3750.5150.50.047
9/160.5920.5441.04510.9690.0450.4610.4160.5780.5630.078
5/80.6570.6061.1471.0941.0630.050.5060.4560.640.6250.078
3/40.7820.7291.3031.251.2190.050.5410.4910.7650.750.078
7/80.9380.8531.5121.4691.4060.0630.6260.5630.9060.8750.094
11.0620.9761.71.6561.5940.0630.690.6271.03110.094
Repair Head
5/160.3120.2990.5560.5310.5160.020.2320.2120.3250.3130.031
3/80.3750.360.6590.6240.6090.0250.2720.2470.3870.3750.047
7/160.4380.4210.7790.7340.7190.030.3240.2940.450.4380.047
1/20.50.4830.8980.8431.8280.0350.3750.340.5150.50.047
9/160.5920.5441.0020.9530.9220.040.4230.3830.5780.5630.078
5/80.6570.6061.0961.0471.0160.040.4580.4180.640.6250.078
3/40.7820.7291.2521.2031.1720.040.4930.4530.7650.750.078
7/80.9380.8531.4651.4221.3590.050.5730.5230.9060.8750.094
11.0620.9761.6531.6091.5470.050.6370.5871.03110.094

Notes :

  • Where specifying nominal size in decimals, zeros preceding the decimals and in the fourth decimal place shall be omitted.
  • This size is not recommended.
  • The letter “R” shall be shown on top of the repair head to distinguish it from the regular head bolt.