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» Fastener & Gasket » ASME B18.2.1 Lobed Head Screws

ASME B18.2.1 Lobed Head Screws

September 27, 2019

Technical Drawing

ASME B18.2.1 lobed head screw

Drawing for the external lobed head screw conforming to ASME B18.2.1.

3D drawing for lobed head screw

The 3D drawing for an external lobed head screw conforming to ASME B18.2.1.

ASME B18.2.1 has specified (external) lobed head screws in nominal sizes 1/4″ through 1-3/8″. The nominal sizes also indicate basic major diameter of the thread. Similar to the hex flange screw, a lobed head screw shall be formed as one piece but is constructed in three sections: externally lobed head, flange, and thread rod. The flange section works as a washer but provide better tightening. The external lobed head, often in six lobes, provides a easy way to drive the screw by using a sleeve-like screwdriver. As illustrated in the drawing: C – flange diameter; G – width across corners; B – maximum minor diameter; H – head height; K – flange thickness; each size should have a mating drive size Dr.

Dimensions

SizeGH
Max.Min.
1/4"0.28700.2550.245
5/16"0.36200.3230.313
3/8"0.43100.3940.384
7/16"0.49900.4720.462
1/2"0.57100.5150.505
9/16"0.64500.5510.541
5/8"0.71500.6300.620
3/4"0.86000.7870.777
7/8"1.00000.8660.856
1"1.13801.0631.053
1-1/8"1.28001.1811.171
1-1/4"1.42001.2991.289
1-3/8"1.56201.4171.407
*All dimensions are in inch units.

SizeBK
Max.Min.
1/4"0.20730.0700.060
5/16"0.26630.1000.090
3/8"0.31030.1250.115
7/16"0.36130.1550.145
1/2"0.41130.1600.150
9/16"0.46630.1650.153
5/8"0.51830.2000.188
3/4"0.61830.2550.243
7/8"0.71930.2700.260
1"0.83930.3550.343
1-1/8"0.94330.3820.370
1-1/4"1.04630.4220.410
1-3/8"1.15130.4530.441
*All dimensions are in inch units.

SizeDrC
Max.Min.
1/4"E80.3750.365
5/16"E100.4690.457
3/8"E120.5620.550
7/16"E140.6560.642
1/2"E160.7500.735
9/16"E180.8440.828
5/8"E200.9380.921
3/4"E241.1251.107
7/8"E281.3121.293
1"E321.5001.479
1-1/8"E361.6881.665
1-1/4"E401.8751.852
1-3/8"E442.0622.038
*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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