ASME B18.2.2 Hex Flange Nuts

ASME B18.2.2 Hex Flange Nuts Standard covers the dimensional requirements for nine product types of inch series bolts and screws recognized as American National Standard. Also included are appendices covering gaging procedures, grade markings for bolts and screws, formulas on which dimensional data are based, and a specification to assist in identifying a product as being a screw or a bolt. Where questions arise concerning acceptance of product, the dimensions in the tables shall govern over recalculation by formula. Heavy hex structural bolts, formerly covered in ASME B18.2.1, are now covered in ASME B18.2.6.
The inclusion of dimensional data in this Standard is not intended to imply that all of the products described herein are stock production sizes. Consumers should consult with suppliers concerning lists of stock production sizes.

ASME B18.2.2 Hex Flange Nuts Dimensions (mm)

Nominal Size	Basic Major Diameter of Thread	Width Across Flats, F		Width Across Corners, G		Diameter Flange, B		Nut Thickness, H		Minimum Wrenching Length, J	Minimum Flange Thickness, K	Maximum Runout of Bearing Surface to Thread Axis, FIM
		Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.
ASME B18.2.2 - #6	0.138	0.302	0.312	0.342	0.361	0.406	0.422	0.156	0.171	0.1	0.02	0.014
ASME B18.2.2 - #8	0.164	0.334	0.344	0.381	0.397	0.452	0.469	0.187	0.203	0.13	0.02	0.016
ASME B18.2.2 - #10	0.19	0.365	0.375	0.416	0.433	0.48	0.5	0.203	0.219	0.13	0.03	0.017
ASME B18.2.2 - #12	0.216	0.428	0.438	0.488	0.505	0.574	0.594	0.222	0.236	0.14	0.04	0.02
ASME B18.2.2 - 1⁄4	0.25	0.428	0.438	0.488	0.505	0.574	0.594	0.222	0.236	0.14	0.04	0.02
ASME B18.2.2 - 5⁄16	0.3125	0.489	0.5	0.557	0.577	0.66	0.68	0.268	0.283	0.17	0.04	0.023
ASME B18.2.2 - 3⁄8	0.375	0.551	0.562	0.628	0.65	0.728	0.75	0.33	0.347	0.23	0.04	0.025
ASME B18.2.2 - 7⁄16	0.4375	0.675	0.688	0.768	0.794	0.91	0.937	0.375	0.395	0.26	0.04	0.032
ASME B18.2.2 - 1⁄2	0.5	0.736	0.75	0.84	0.866	1	1.031	0.437	0.458	0.31	0.05	0.035
ASME B18.2.2 - 9⁄16	0.5625	0.861	0.875	0.982	1.01	1.155	1.188	0.483	0.506	0.35	0.05	0.04
ASME B18.2.2 - 5⁄8	0.625	0.922	0.938	1.051	1.083	1.248	1.281	0.545	0.569	0.4	0.05	0.044
ASME B18.2.2 - 3⁄4	0.75	1.088	1.125	1.24	1.299	1.46	1.5	0.627	0.675	0.46	0.06	0.051
GENERAL NOTES: (a) For additional requirements refer to section 3, General Data. (b) Concentricity of Tapped Hole. Axis of tapped hole shall be concentric with axis of nut body within a tolerance equal to 3% (6% FIM) of the maximum width across flats.

ASME B18.2.2 Hex Flange Nuts Dimensions (Inch)

Nominal Size	Basic Major Diameter of Thread	Width Across Flats, F		Width Across Corners, G		Diameter Flange, B		Nut Thickness, H		Minimum Wrenching Length, J	Minimum Flange Thickness, K	Maximum Runout of Bearing Surface to Thread Axis, FIM
		Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.
ASME B18.2.2 - #6	0.138	0.302	0.312	0.342	0.361	0.406	0.422	0.156	0.171	0.1	0.02	0.014
ASME B18.2.2 - #8	0.164	0.334	0.344	0.381	0.397	0.452	0.469	0.187	0.203	0.13	0.02	0.016
ASME B18.2.2 - #10	0.19	0.365	0.375	0.416	0.433	0.48	0.5	0.203	0.219	0.13	0.03	0.017
ASME B18.2.2 - #12	0.216	0.428	0.438	0.488	0.505	0.574	0.594	0.222	0.236	0.14	0.04	0.02
ASME B18.2.2 - 1⁄4	0.25	0.428	0.438	0.488	0.505	0.574	0.594	0.222	0.236	0.14	0.04	0.02
ASME B18.2.2 - 5⁄16	0.3125	0.489	0.5	0.557	0.577	0.66	0.68	0.268	0.283	0.17	0.04	0.023
ASME B18.2.2 - 3⁄8	0.375	0.551	0.562	0.628	0.65	0.728	0.75	0.33	0.347	0.23	0.04	0.025
ASME B18.2.2 - 7⁄16	0.4375	0.675	0.688	0.768	0.794	0.91	0.937	0.375	0.395	0.26	0.04	0.032
ASME B18.2.2 - 1⁄2	0.5	0.736	0.75	0.84	0.866	1	1.031	0.437	0.458	0.31	0.05	0.035
ASME B18.2.2 - 9⁄16	0.5625	0.861	0.875	0.982	1.01	1.155	1.188	0.483	0.506	0.35	0.05	0.04
ASME B18.2.2 - 5⁄8	0.625	0.922	0.938	1.051	1.083	1.248	1.281	0.545	0.569	0.4	0.05	0.044
ASME B18.2.2 - 3⁄4	0.75	1.088	1.125	1.24	1.299	1.46	1.5	0.627	0.675	0.46	0.06	0.051
GENERAL NOTES: (a) For additional requirements refer to section 3, General Data. (b) Concentricity of Tapped Hole. Axis of tapped hole shall be concentric with axis of nut body within a tolerance equal to 3% (6% FIM) of the maximum width across flats.