Inch series · technical reference

Finished Hex Nut Dimensions

Finished hex nut envelope dimensions for common inch UNC sizes. This is not a chart for thin, heavy-hex, flange, prevailing-torque or metric nuts.

Source: ASME B18.2.2.

StandardASME B18.2.2.4A · Inch Series
RevisionSource review · 2026-09
Unitsinches
CAD ORTHOGRAPHIC REFERENCEASME B18.2.2.4A · INCH SERIES REFERENCE
ASME B18.2.2 finished hex nut dimension drawing, side view with dimension callouts, 1/4-20 UNC reference size
SIDE VIEW · HEIGHT REFERENCE · 1/4-20 UNC
ASME B18.2.2 finished hex nut dimension drawing, end view showing width across flats and across corners, 1/4-20 UNC reference size
TOP VIEW · ACROSS FLATS · 1/4-20 UNC

Reference size shown: 1/4-20 UNC. The drawing identifies dimension locations only. Use the table for nominal data and confirm the exact product configuration before ordering.

Finished hex nut envelope dimensions
Nominal sizeTPIs — WAF basicm — height basice — corners
1/4 in200.43750.2190.505 max
5/16 in180.50000.2660.577 max
3/8 in160.56250.3280.650 max
7/16 in140.68750.3750.794 max
1/2 in130.75000.4380.866 max
9/16 in120.87500.4841.010 max
5/8 in110.93750.5471.083 max
3/4 in101.12500.6411.299 max
7/8 in91.31250.7501.516 max
1 in81.50000.8591.732 max
1-1/4 in71.87501.0632.165 max
1-1/2 in62.25001.2812.598 max

Illustration is not to scale. Use the stated standard and product specification for tolerance, grade and thread-class requirements.

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