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» Fastener & Gasket » ASME B18.2.1 Hex Cap Screw

ASME B18.2.1 Hex Cap Screw

September 27, 2019

Technical Drawing

ASME B18.2.1 hex cap screw

Drawing for the hex cap screw made in accordance with ASME B18.2.1.

The hex cap screw, manufactured in accordance with the ASME B18.2.1, is the most classic screw with a hexagonal head. It can fit an pre-tapped hole without using a nut. The basic dimensions include E: body diameter; H: head height; F: width across flats; G: width across corners; LT: nominal thread length for screw lengths; J: minimum wrenching height.

Dimensions & Weight

SizeEF
Max.Min.Max.Min.
1/4"0.25000.24500.4380.428
5/16"0.31250.30650.5000.489
3/8"0.37500.36900.5620.551
7/16"0.43750.43050.6250.612
1/2"0.50000.49300.7500.736
9/16"0.56250.55450.8120.798
5/8"0.62500.61700.9380.922
3/4"0.75000.74101.1251.100
7/8"0.87500.86601.3121.285
1"1.00000.99001.5001.469
1-1/8"1.12501.11401.6881.631
1-1/4"1.25000.23901.8751812
1-3/8"1.37501.36302.0621994
1-1/2"1.50001.48802.2502175
1-5/8"1.62501.61302.4382.356
1-3/4"1.75001.73802.6252.538
1-7/8"1.87501.86302.8122.719
2"2.00001.98803.0002.900
2-1/4"2.25002.23803.3753.262
2-1/2"2.50002.48803.7503.625
2-3/4"2.75002.73804.1253.988
3"3.00002.98804.5004.350
*All dimensions are in inch units.

SizeJH
Max.Min.
1/4"0.1060.1630.150
5/16"0.1400.2110.195
3/8"0.1600.2430.226
7/16"0.1950.2910.272
1/2"0.2150.3230.302
9/16"0.2500.3710.348
5/8"0.2690.4030.378
3/4"0.3240.4830.455
7/8"0.3780.5630.531
1"0.4160.6270.591
1-1/8"0.4610.7180.658
1-1/4"0.5300.8130.749
1-3/8"0.5690.8780.810
1-1/2"0.6400.9740.902
1-5/8"0.6941.0380.962
1-3/4"0.7481.1341.054
1-7/8"0.8021.1981.114
2"0.8251.2631.175
2-1/4"0.9331.4231.327
2-1/2"1.0421.5831.479
2-3/4"1.1511.7441.632
3"1.2901.9351.815
*All dimensions are in inch units.

SizeLTG
≤6"≥6"Max.Min.
1/4"0.7501.0000.5050.488
5/16"0.8751.1250.5770.557
3/8"1.0001.2500.6500.628
7/16"1.1251.3750.7220.698
1/2"1.2501.5000.8660.840
9/16"1.3751.6250.9380.910
5/8"1.5001.7501.0831.051
3/4"1.7502.0001.2991.254
7/8"2.0002.2501.5161.465
1"2.2502.5001.7321.675
1-1/8"2.5002.7501.9491.859
1-1/4"2.7503.0002.1652.066
1-3/8"3.0003.2502.3822.273
1-1/2"3.2503.5002.5982.480
1-5/8"3.5003.7502.8152.686
1-3/4"3.7504.0003.0312.893
1-7/8"4.0004.2503.2483.099
2"4.2504.5003.4643.306
2-1/4"-5.0003.8973.719
2-1/2"-5.5004.3304.133
2-3/4"-6.0004.7634.546
3"-6.5005.1964.959
*All dimensions are in inch units.

ASME B18.2.1 Nine Types of Bolts & Screws
Square Head BoltHex BoltHeavy Hex Bolt
Askew Head BoltHex Cap ScrewHeavy Hex Screw
Hex Flange ScrewLobed Head ScrewLag Screw
Click to view the dimensions of ASME B18.2.1 bolt and screw. Please contact our technical teams for the unit weight of each screw.

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