Fasteners

STAINLESS STEEL HEX CAP SCREWS (FINISHED HEX BOLTS)

Nominal Size ₁ or Basic, Product Diameter		D		F			G		H			J	L		Y
		Body Diameter		Width Across Flats			Width Across,orners		Height			Wrenching,Height	Thread Length forScrew Lengths		Transition Thread Lengths
		Body Diameter		Width Across Flats			Width Across,orners		Height			Wrenching,Height	6 in, &Shorter	Over 6 in.	Transition Thread Lengths
		Max	Min	Basic	Max	Min	Max	Min	Basic	Max	Min	Min	Basic	Basic	Max
1/4	0.2500	0.2500	0.2450	7/16	0.438	0.428	0.505	0.488	5/32	0.163	0.150	0.106	0.750	1.000	0.250
5/16	0.3125	0.3125	0.3065	1/2	0.500	0.489	0.577	0.557	13/64	0.211	0.195	0.140	0.875	1.125	0.278
3/8	0.3750	0.3750	0.3690	9/16	0.562	0.551	0.650	0.628	15/64	0.243	0.226	0.160	1.000	1.250	0.312
7/16	0.4375	0.4375	0.4305	5/8	0.625	0.612	0.722	0.698	9/32	0.291	0.272	0.195	1.125	1.375	0.357
1/2	0.5000	0.5000	0.4930	3/4	0.750	0.736	0.866	0.840	5/16	0.323	0.302	0.215	1.250	1.500	0.385
9/16	0.5625	0.5625	0.5545	13/16	0.812	0.798	0.938	0.910	23/64	0.374	0.348	0.250	1.375	1.625	0.417
5/8	0.6250	0.6250	0.6170	15/16	0.938	0.922	1.083	1.051	25/64	0.403	0.378	0.269	1.500	1.750	0.455
3/4	0.7500	0.7500	0.7410	1-1/8	1.125	1.100	1.299	1.254	15/32	0.483	0.455	0.324	1.750	2.000	0.500
7/8	0.8750	0.8750	0.8660	1-5/16	1.312	1.285	1.516	1.465	35/64	0.563	0.531	0.378	2.000	2.250	0.556
1	1.0000	1.0000	0.9900	1-1/2	1.500	1.469	1.732	1.675	39/64	0.627	0.591	0.416	2.250	2.500	0.625
1-1/8	1.1250	1.1250	1.1140	1-11/16	1.688	1.631	1.949	1.859	11/16	0.718	0.658	0.461	2.500	2.750	0.714
1-1/4	1.2500	1.2500	1.2390	1-7/8	1.875	1.812	2.165	2.066	25/32	0.813	0.749	0.530	2.750	3.000	0.714
1-3/8	1.3750	1.3750	1.3630	2-1/16	2.062	1.994	2.382	2.273	27/32	0.878	0.810	0.569	3.000	3.250	0.833
1-1/2	1.5000	1.5000	1.4880	2-1/4	2.230	2.175	2.598	2.480	1-5/16	0.974	0.902	0.640	3.250	3.500	0.833
1-3/4	1.7500	1.7500	1.7380	2-5/8	2.625	2.538	3.031	2.893	1-3/32	1.134	1.054	0.748	3.750	4.000	1.000
2	2.0000	2.0000	1.9880	3	3.000	2.900	3.464	3.306	1-7/32	1.263	1.175	0.825	4.250	4.500	1.111
2-1/4	2.2500	2.2500	2.2380	3-3/8	3.375	3.262	3.897	3.719	1-3/8	1.423	1.327	0.933	4.750	5.000	1.111
2-1/2	2.5000	2.5000	2.4880	3-3/4	3.750	3.625	4.330	4.133	1-17/32	1.583	1.479	1.042	5.250	5.500	1.250
2-3/4	2.7500	2.7500	2.7380	4-1/8	4.125	3.988	4.763	4.546	1-11/16	1.744	1.632	1.151	5.750	6.000	1.250
3	3.0000	3.0000	2.9880	4-1/2	4.500	4.350	5.196	4.959	1-7/8	1.935	1.815	1.290	6.250	6.500	1.250

ANSIB18.2.1–1981

STAINLESS STEEL HEAVY HEX CAP SCREWS

Nominal Size ₁ or Basic, Product Diameter		D		F			G		H			J	L		Y
		Body Diameter		Width Across Flats			Width Across,orners		Height			Wrenching,Height	Thread Length forScrew Lengths		Transition ThreadLengths
		Body Diameter		Width Across Flats			Width Across,orners		Height			Wrenching,Height	6 in,& Shorter	6 in.	Transition ThreadLengths
		Max	Min	Basic	Max	Min	Max	Min	Basic	Max	Min	Min	Basic	Basic	Max
1/2	0.5000	0.5000	0.482	7/8	0.875	0.850	1.010	0.969	5/16	0.323	0.302	0.215	1.250	1.500	0.385
5/8	0.6250	0.6250	0.605	1-1/16	1.062	1.031	1.227	1.175	25/64	0.403	0.378	0.269	1.500	1.750	0.455
3/4	0.7500	0.7500	0.729	1-1/4	1.250	1.212	1.443	1.383	15/32	0.483	0.455	0.324	1.750	2.000	0.500
7/8	0.8750	0.8750	0.852	1-7/16	1.438	1.394	1.660	1.589	35/64	0.563	0.531	0.378	2.000	2.250	0.556
1	1.0000	1.0000	0.976	1-5/8	1.625	1.575	1.876	1.796	39/64	0.627	0.591	0.416	2.250	2.500	0.625
1-1/8	1.1250	1.1250	1.098	1-13/16	1.812	1.756	2.093	2.002	11/16	0.718	0.658	0.461	2.500	2.750	0.714
1-1/4	1.2500	1.2500	1.223	2	2.000	1.938	2.309	2.209	25/32	0.813	0.749	0.530	2.750	3.000	0.714
1-3/8	1.3750	1.3750	1.345	2-3/16	2.188	2.119	2.526	2.416	27/32	0.878	0.810	0.569	3.000	3.250	0.833
1-1/2	1.5000	1.5000	1.470	2-3/8	2.375	2.300	2.742	2.622	15/16	0.974	0.902	0.640	3.250	3.500	0.833
1-3/4	1.7500	1.7500	1.716	2-3/4	2.750	2.662	3.175	3.035	1-3/32	1.134	1.054	0.748	3.750	4.000	1.000
2	2.0000	2.0000	1.964	3-1/8	3.125	3.025	3.608	3.449	1-7/32	1.263	1.175	0.825	4.250	4.500	1.111
2-1/4	2.2500	2.2500	2.214	3-1/2	3.500	3.388	4.041	3.862	1-3/8	1.423	1.327	0.933	4.750	5.000	1.111
2-1/2	2.5000	2.5000	2.461	3-7/8	3.875	3.750	4.474	4.275	1-17/32	1.583	1.479	1.042	5.250	5.500	1.250
2-3/4	2.7500	2.7500	2.711	4-1/4	4.250	4.112	4.907	4.688	1-11/16	1.744	1.632	1.151	5.750	6.000	1.250
3	3.0000	3.0000	2.961	4-5/8	4.625	4.475	5.340	5.102	1-7/8	1.935	1.815	1.290	6.250	6.500	1.250

ANSIB18.2.1–1981

STAINLESS STEEL HEX NUTS &
HEX JAM NUTS

		F			G		H			H1			Hex Nuts Specified, Proof Load		Jam Nuts All Strength Levels
Nominal Size₁, or Basic Major Diameter of Thread		Width Across Flats			Width Across,Corners		Thickness,Hex Nuts			Thickness,Hex Jam Nuts			Up to 150,000 psi	150,000 psi and Greater	Jam Nuts All Strength Levels
Nominal Size₁, or Basic Major Diameter of Thread		Basic	Max	Min	Max	Min	Basic	Max	Min	Basic	Max	Min	Runout of Bearing Face, FIR Max
1/4	0.2500	7/16	0.438	0.428	0.505	0.488	7/32	0.226	0.212	5/32	0.163	0.150	0.015	0.010	0.015
5/16	0.3125	1/2	0.500	0.489	0.577	0.557	17/64	0.273	0.258	3/16	0.195	0.180	0.016	0.011	0.016
3/8	0.3750	9/16	0.562	0.551	0.650	0.628	21/64	0.337	0.320	7/32	0.227	0.210	0.017	0.012	0.017
7/16	0.4375	11/16	0.688	0.675	0.794	0.768	3/8	0.385	0.365	1/4	0.260	0.240	0.018	0.013	0.018
1/2	0.5000	3/4	0.750	0.736	0.866	0.840	7/16	0.448	0.427	5/16	0.323	0.302	0.019	0.014	0.019
9/16	0.5625	7/8	0.875	0.861	1.010	0.982	31/64	0.496	0.473	5/16	0.324	0.301	0.020	0.015	0.020
5/8	0.6250	15/16	0.938	0.922	1.083	1.051	35/64	0.559	0.535	3/8	0.387	0.363	0.021	0.016	0.021
3/4	0.7500	1-1/8	1.125	1.088	1.299	1.240	41/64	0.665	0.617	27/64	0.446	0.398	0.023	0.018	0.023
7/8	0.8750	1-5/16	1.312	1.269	1.516	1.447	3/4	0.776	0.724	31/64	0.510	0.458	0.025	0.020	0.025
1	1.0000	1-1/2	1.500	1.450	1.732	1.653	55/64	0.887	0.831	35/64	0.575	0.519	0.027	0.022	0.027
1-1/8	1.1250	1-11/16	1.688	1.631	1.949	1.859	31/32	0.999	0.939	39/64	0.639	0.579	0.030	0.025	0.030
1-1/4	1.2500	1-7/8	1.875	1.812	2.165	2.066	1-1/16	1.094	1.030	23/32	0.751	0.687	0.033	0.028	0.033
1-3/8	1.3750	2-1/16	2.062	1.994	2.382	2.273	1-11/64	1.206	1.138	25/32	0.815	0.747	0.036	0.031	0.036
1-1/2	1.5000	2-1/4	2.250	2.175	2.598	2.480	1-9/32	1.317	1.245	27/32	0.880	0.080	0.039	0.034	0.039

ANSIB18.2.2–1972

STAINLESS STEEL SQUARE &
HEX MACHINE SCREW NUTS

Nominal Size1,or Basic,Thread Diameter		F			G		G1		H
		Width Across Flats			Width Across Corners				Thickness
		Width Across Flats			Square		Hex		Thickness
		Basic	Max	Min	Max	Min	Max	Min	Max	Min
0	0.0600	5/32	0.156	0.150	0.221	0.206	0.180	0.171	0.050	0.043
1	0.0730	5/32	0.156	0.150	0.221	0.206	0.180	0.171	0.050	0.043
2	0.0860	3/16	0.188	0.180	0.265	0.247	0.217	0.205	0.066	0.057
3	0.0990	3/16	0.188	0.180	0.265	0.247	0.217	0.205	0.066	0.057
4	0.1120	1/4	0.250	0.241	0.354	0.331	0.289	0.275	0.098	0.087
5	0.1250	5/16	0.312	0.302	0.442	0.415	0.361	0.344	0.114	0.102
6	0.1380	5/16	0.312	0.302	0.442	0.415	0.361	0.344	0.114	0.102
8	0.1640	11/32	0.344	0.332	0.486	0.456	0.397	0.378	0.130	1.117
10	0.1900	3/8	0.375	0.362	0.530	0.497	0.433	0.413	0.130	0.117
12	0.2160	7/16	0.438	0.423	0.619	0.581	0.505	0.482	0.161	0.148
1/4	0.2500	7/16	0.438	0.423	0.619	0.581	0.505	0.482	0.193	0.178
5/16	0.3125	9/16	0.562	0.545	0.795	0.748	0.650	0.621	0.225	0.208
3/8	0.3750	5/8	0.625	0.607	0.884	0.833	0.722	0.692	0.257	0.239

1 Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.	2 Square machine screw nuts shall have tops and bottoms flat, without chamfer. The bearing surface shall be perpendicular to the axis of the threaded hole pitch cylinder within a tolerance of 4 deg.	3 Hexagon machine screw nuts shall have tops flat with chamfered corners. Diameter of top circle shall be equal to the maximum width across flats within a tolerance of minus 15 percent. The bearing surface shall be perpendicular to the axis of the threaded hole pitch cylinder within a tolerance of 4 deg.	4 Bottoms of hexagon machine screw nuts are normally flat, but for special purposes may be chamfered, if so specified by purchaser.

STAINLESS STEEL HEAVY HEX NUTS &
HEAVY HEX JAM NUTS

		F			G		H			H1			Hex Nuts Specified, Proof Load		Jam Nuts All Strength Levels
Nominal Size₁, or Basic Major Diameter of Thread		Width Across Flats			Width Across,Corners		Thickness,Hex Nuts			Thickness,Hex Jam Nuts			Up to 150,000 psi	150,000 psi and Greater	Jam Nuts All Strength Levels
Nominal Size₁, or Basic Major Diameter of Thread		Basic	Max	Min	Max	Min	Basic	Max	Min	Basic	Max	Min	Runout of Bearing Face, FIR Max
1/4	0.2500	1/2	0.500	0.488	0.577	0.556	15/64	0.250	0.218	11/64	0.188	0.156	0.017	0.011	0.017
5/16	0.3125	9/16	0.562	0.546	0.650	0.622	19/64	0.314	0.280	13/64	0.220	0.186	0.020	0.012	0.020
3/8	0.3750	11/16	0.688	0.669	0.794	0.763	23/64	0.377	0.341	15/64	0.252	0.216	0.021	0.014	0.021
7/16	0.4375	3/4	0.750	0.728	0.866	0.830	27/64	0.441	0.403	17/64	0.285	0.247	0.022	0.015	0.022
1/2	0.5000	7/8	0.875	0.850	1.010	0.969	31/64	0.504	0.464	19/64	0.317	0.277	0.023	0.016	0.023
9/16	0.5625	15/16	0.938	0.909	1.083	1.037	35/64	0.568	0.526	21/64	0.349	0.307	0.024	0.017	0.024
5/8	0.6250	1-1/16	1.062	1.031	1.227	1.175	39/64	0.631	0.587	23/64	0.381	0.337	0.025	0.018	0.025
3/4	0.7500	1-1/4	1.250	1.212	1.443	1.382	47/64	0.758	0.710	27/64	0.446	0.398	0.027	0.020	0.027
7/8	0.8750	1-7/16	1.438	1.394	1.660	1.589	55/64	0.885	0.833	31/64	0.510	0.458	0.029	0.022	0.029
1	1.0000	1-5/8	1.625	1.575	1.876	1.796	63/64	1.012	0.956	35/64	0.575	0.519	0.031	0.024	0.031
1-1/8	1.1250	1-13/16	1.812	1.756	2.093	2.002	1-7/64	1.139	1.079	39/64	0.639	0.579	0.033	0.027	0.033
1-1/4	1.2500	2	2.000	1.938	2.309	2.209	1-7/32	1.251	1.187	23/32	0.751	0.687	0.035	0.030	0.035
1-1/8	1.3750	2-3/16	2.188	2.119	2.526	2.416	1-11/32	1.378	1.310	25/32	0.815	0.747	0.038	0.033	0.038
1-1/2	1.5000	2-3/8	2.375	2.300	2.742	2.622	1-15/32	1.505	1.433	27/32	0.880	0.808	0.041	0.036	0.041
1-5/8	1.6250	2-9/16	2.562	2.481	2.959	2.828	1-19/32	1.632	1.556	29/32	0.944	0.868	0.044	0.038	0.044
1-3/4	1.7500	2-3/4	2.750	2.662	3.175	3.035	1-23/32	1.759	1.679	31/32	1.009	0.929	0.048	0.041	0.048
1-7/8	1.875	2-15/16	2.938	2.844	3.392	3.242	1-27/32	1.886	1.802	1-1/32	1.073	0.989	0.051	0.044	0.051
2	2.000	3-1/8	3.125	3.025	3.608	3.449	1-31/32	2.013	1.925	1-3/32	1.138	1.050	0.055	0.047	0.055
2-1/4	2.2500	3-1/2	3.500	3.388	4.041	3.862	2-13/64	2.251	2.155	1-13/64	1.251	1.155	0.061	0.052	0.061
2-1/2	2.5000	3-7/8	3.875	3.750	4.474	4.275	2-29/64	2.505	2.401	1-29/64	1.505	1.401	0.068	0.058	0.068
2-3/4	2.7500	4-1/4	4.250	4.112	4.907	4.688	2-45/64	2.759	2.647	1-37/64	1.634	1.522	0.074	0.064	0.074
3	3.0000	4-5/8	4.625	4.475	5.340	5.102	2-61/64	3.013	2.893	1-45/64	1.763	1.643	0.081	0.070	0.081
3-1/4	3.2500	5	5.000	4.838	5.774	5.515	3-3/16	3.252	3.124	1-13/16	1.876	1.748	0.087	0.075	0.087
3-1/2	3.5000	5-3/8	5.375	5.200	6.207	5.928	3-7/16	3.506	3.370	1-15/16	2.006	1.870	0.094	0.081	0.094
3-3/4	3.7500	5-3/4	5.750	5.562	6.640	6.341	3-11/16	3.760	3.616	2-1/16	2.134	1.990	0.100	0.087	0.100
4	4.0000	6-1/8	6.125	5.925	7.073	6.755	3-15/16	4.014	3.862	2-3/16	2.264	2.112	0.107	0.093	0.107

ANSI B18.22–1972

STAINLESS STEEL REGULAR HELICAL SPRING LOCK WASHERS1

Nominal Washer Size		A		B	T	W
		inside Washer Size		Outside,Diameter	Mean Section,Thickness,( 2,)	Section,Width
		Max	Min	Max2	Min	Min
NO.2	0.086	0.094	0.088	0.172	0.020	0.035
NO.3	0.099	0.107	0.101	0.195	0.025	0.040
NO.4	0.112	0.120	0.114	0.209	0.025	0.040
NO.5	0.125	0.133	0.127	0.236	0.031	0.047
NO.6	0.138	0.148	0.141	0.250	0.031	0.047
NO.8	0.164	0.174	0.167	0.293	0.040	0.055
NO.10	0.190	0.200	0.193	0.334	0.047	0.062
NO.12	0.216	0.227	0.220	0.377	0.056	0.070
1/4	0.250	0.262	0.254	0.489	0.062	0.109
5/16	0.312	0.326	0.317	0.586	0.078	0.125
3/8	0.375	0.390	0.380	0.683	0.094	0.141
7/16	0.438	0.455	0.443	0.779	0.109	0.156
1/2	0.500	0.518	0.506	0.873	0.125	0.171
9/16	0.562	0.582	0.570	0.971	0.141	0.188
5/8	0.625	0.650	0.635	1.079	0.156	0.203
13/16	0.688	0.713	0.698	1.176	0.172	0.219
3/4	0.750	0.775	0.760	1.271	0.188	0.234
11/16	0.812	0.843	0.824	1.367	0.200	0.250
7/8	0.875	0.905	0.887	1.464	0.219	0.266
15/16	0.938	0.970	0.950	1.560	0.234	0.281
1	1.000	1.042	1.017	1.661	0.250	0.297
1-1/16	1.062	1.107	1.080	1.756	0.266	0.312
1-1/8	1.125	1.172	1.144	1.853	0.281	0.328
1-3/16	1.188	1.237	1.208	1.950	0.297	0.344
1-1/4	1.250	1.302	1.271	2.045	0.312	0.359
1-5/16	1.312	1.366	1.334	2.141	0.328	0.375
1-3/8	1.375	1.432	1.398	2.239	0.344	0.391
1-7/16	1.438	1.497	1.462	2.334	0.359	0.406
1-1/2	1.500	1.561	1.525	2.430	0.375	0.422

1 Formerly designated Medium Helical Spring Lock Washers.

2 The maximum outside diameters specified allow for commercial tolerances on cold drawn wire.

ANSI B18.21.1–1972

STAINLESS STEEL HEXAGON &
SPLINE SOCKET HEAD CAP SCREWS (1960 SERIES)

Nominal Size or Basic Screw Diameter		D		A		H		S	M	J		T	G	K
		Body,Diameter		Head Diameter		Head Height		Head Side Height	Spline Socket Size	Hexagon,Sprocket Size		Key Engage- ment	Wall Thick- ness	Chamfer or Radius
		Max	Min	Max	Min	Max	Min	Min	Nom	Nom		Min	Min	Max
0	0.0600	0.0600	0.5680	0.096	0.091	0.060	0.057	0.054	0.060	0.050		0.025	0.020	0.003
1	0.0730	0.0730	0.0695	0.118	0.112	0.073	0.070	0.066	0.072	1/16	0.062	0.031	0.025	0.003
2	0.0860	0.0860	0.0822	0.140	0.134	0.086	0.083	0.077	0.096	5/64	0.078	0.038	0.029	0.003
3	0.0990	0.0990	0.0949	0.161	0.154	0.099	0.095	0.089	0.096	5/64	0.078	0.044	0.034	0.003
4	0.1120	0.1120	0.1075	0.183	0.176	0.112	0.108	0.101	0.111	3/32	0.094	0.051	0.038	0.005
5	0.1250	0.1250	0.1202	0.205	0.198	0.125	0.121	0.112	0.111	3/32	0.094	0.057	0.043	0.005
6	0.1380	0.1380	0.1329	0.226	0.218	0.138	0.134	0.124	0.133	7/64	0.109	0.064	0.047	0.005
8	0.1640	0.1640	0.1585	0.270	0.262	0.164	0.159	0.148	0.168	9/64	0.141	0.077	0.056	0.005
10	0.1900	0.1900	0.1840	0.312	0.303	0.190	0.185	0.171	0.183	5/32	0.156	0.090	0.065	0.005
1/4	0.2500	0.2500	0.2435	0.375	0.365	0.250	0.244	0.225	0.216	3/16	0.188	0.120	0.095	0.008
5/16	0.3125	0.3125	0.3053	0.469	0.457	0.312	0.306	0.281	0.291	1/4	0.250	0.151	0.119	0.008
3/8	0.3750	0.3750	0.3678	0.562	0.550	0.375	0.368	0.337	0.372	5/16	0.312	0.182	0.143	0.008
7/16	0.4375	0.4375	0.4294	0.656	0.642	0.438	0.430	0.394	0.454	3/8	0.375	0.213	0.166	0.010
1/2	0.5000	0.5000	0.4919	0.750	0.735	0.500	0.492	0.450	0.454	3/8	0.375	0.245	0.190	0.010
5/8	0.6250	0.6250	0.6163	0.938	0.921	0.625	0.616	0.562	0.595	1/2	0.500	0.307	0.238	0.010
3/4	0.7500	0.7500	0.7406	1.125	1.107	0.750	0.740	0.675	0.620	5/8	0.625	0.370	0.285	0.010
7/8	0.8750	0.8750	0.8647	1.312	1.293	0.875	0.864	0.787	0.698	3/4	0.750	0.432	0.333	0.015
1	1.0000	1.0000	0.9886	1.500	1.479	1.000	0.988	0.900	0.790	3/4	0.750	0.495	0.380	0.015
1-1/8	1.1250	1.1250	1.1086	1.688	1.665	1.125	1.111	1.012	–	7/8	0.875	0.557	0.428	0.015
1-1/4	1.2500	1.2500	1.2336	1.875	1.852	1.250	1.236	1.125	–	7/8	0.875	0.620	0.475	0.015
1-3/8	1.3750	1.3750	1.3568	2.062	2.038	1.375	1.360	1.237	–	1	1.000	0.682	0.523	0.015
1-1/2	1.5000	1.5000	1.4818	2.250	2.224	1.500	1.485	1.350	–	1	1.000	0.745	0.570	0.015
1-3/4	1.7500	1.7500	1.7295	2.625	2.597	1.750	1.734	1.575	–	1-1/4	1.250	0.870	0.665	0.015
2	2.0000	2.0000	1.9780	3.000	2.970	2.000	1.983	1.800	–	1-1/2	1.500	0.995	0.760	0.015
2-1/4	2.2500	2.2500	2.2280	3.375	3.344	2.250	2.232	2.025	–	1-3/4	1.750	1.120	0.855	0.031
2-1/2	2.5000	2.5000	2.4762	3.750	3.717	2.500	2.481	2.250	–	1-3/4	1.750	1.245	0.950	0.031
2-3/4	2.7500	2.7500	2.7262	4.125	4.090	2.750	2.730	2.475	–	2	2.000	1.370	1.045	0.031
3	3.0000	3.0000	2.9762	4.500	4.464	3.000	2.979	2.700	–	2-1/4	2.250	1.495	1.140	0.031
3-1/4	3.2500	3.2500	3.2262	4.875	4.837	3.250	3.228	2.925	–	2-1/4	2.250	1.620	1.235	0.031
3-1/2	3.5000	3.5000	3.4762	5.250	5.211	3.500	3.478	3.150	–	2-3/4	2.750	1.745	1.330	0.031
3-3/4	3.7500	3.7500	3.7262	5.625	5.584	3.750	3.727	3.375	–	2-3/4	2.750	1.870	1.425	0.031
4	4.0000	4.0000	3.9762	6.000	5.958	4.000	3.976	3.600	–	3	3.000	1.995	1.520	0.031

ANSIASME B18.3–1982

STAINLESS STEEL HEXAGON & SPLINE SOCKET SET SCREWS

Nominal Size or Basic Screw Diameter		J		M	T		C		R	Y
		Hexagon,Socket Size		Spline Socket Size	Min Key Engagement to Develop Functional Capability of Key		Cup and Flat,Point Diameters		Oval Point Radius	Cone Point Angle90º ± 2º,For These Nominal,Lengths or Longer:118º ± 2º,For Shorter,Nominal Lengths
		Nom		Nom	Hex Socket T,Min	Spline Socket T Min	Max	Min	Basic
0	0.06	0.028		0.033	0.05	0.026	0.033	0.027	0.045	5/64
1	0.073	0.035		0.033	0.06	0.035	0.04	0.033	0.055	3/32
2	0.086	0.035		0.048	0.06	0.04	0.047	0.039	0.064	7/64
3	0.099	0.05		0.048	0.07	0.04	0.054	0.045	0.074	1/8
4	0.112	0.05		0.06	0.07	0.045	0.061	0.051	0.084	5/32
5	0.125	1/16	0.062	0.072	0.08	0.055	0.067	0.057	0.094	3/16
6	0.138	1/16	0.062	0.072	0.08	0.055	0.074	0.064	0.104	3/16
8	0.164	5/64	0.078	0.096	0.09	0.08	0.087	0.076	0.123	1/4
10	0.19	3/32	0.094	0.111	0.1	0.08	0.102	0.088	0.142	1/4
1/4	0.25	1/8	0.125	0.145	0.125	0.125	0.132	0.118	0.188	5/16
5/16	0.3125	5/32	0.156	0.183	0.156	0.156	0.172	0.156	0.234	3/8
3/8	0.375	3/16	0.188	0.216	0.188	0.188	0.212	0.194	0.281	7/16
7/16	0.4375	7/32	0.219	0.251	0.219	0.219	0.252	0.232	0.328	1/2
1/2	0.5	1/4	0.25	0.291	0.25	0.25	0.291	0.27	0.375	9/16
5/8	0.625	5/16	0.312	0.372	0.312	0.312	0.371	0.347	0.469	3/4
3/4	0.75	3/8	0.375	0.454	0.375	0.375	0.45	0.425	0.562	7/8
7/8	0.875	1/2	0.5	0.595	0.5	0.5	0.53	0.502	0.656	1
1	1	9/16	0.562	–	0.562	–	0.609	0.579	0.75	1-1/8
1-1/8	1.125	9/16	0.562	–	0.562	–	0.689	0.655	0.844	1-1/4
1-1/4	1.25	5/8	0.625	–	0.625	–	0.767	0.733	0.938	1-1/2
1-3/8	1.375	5/8	0.625	–	0.625	–	0.848	0.808	1.031	1-5/8
1-1/2	1.5	3/4	0.75	–	0.75	–	0.926	0.886	1.125	1-3/4
1-3/4	1.75	1	1	–	1	–	1.086	1.039	1.312	2
2	2	1	1	–	1	–	1.244	1.193	1.5	2-1/4

ANSIASME B18.3–1982

STAINLESS STEEL ROUND HEAD SQUARE NECK BOLTS (CARRIAGE BOLTS)

Nominal Size1,or Basic,Bolt Diameter		F		A		H		O		P		Q	R
		Body Diameter		Head Diameter		Head Height		Square Width		Square Depth		Corner Radius on Square	Fillet,Radius
		Max	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max	Max2
NO.10	0.1900	0.199	0.182	0.469	0.438	0.114	0.094	0.199	0.185	0.125	0.094	0.031	0.031
1/4	0.2500	0.260	0.237	0.594	0.563	0.145	0.125	0.260	0.245	0.156	0.125	0.031	0.031
5/16	0.3125	0.324	0.298	0.719	0.688	0.176	0.156	0.324	0.307	0.187	0.156	0.031	0.031
3/8	0.3750	0.388	0.360	0.844	0.782	0.208	0.188	0.388	0.368	0.219	0.188	0.047	0.031
7/16	0.4375	0.452	0.421	0.969	0.907	0.239	0.219	0.452	0.431	0.250	0.219	0.047	0.031
1/2	0.5000	0.515	0.483	1.094	1.032	0.270	0.250	0.515	0.492	0.281	0.250	0.047	0.031
5/8	0.6250	0.642	0.605	1.344	1.219	0.344	0.313	0.642	0.616	0.344	0.313	0.078	0.062
3/4	0.7500	0.768	0.729	1.594	1.469	0.406	0.375	0.768	0.741	0.406	0.375	0.078	0.062
7/8	0.8750	0.895	0.852	1.844	1.719	0.469	0.438	0.895	0.865	0.469	0.438	0.094	0.062
1	1.0000	1.022	0.976	2.094	1.969	0.531	0.500	1.022	0.990	0.531	0.500	0.094	0.062

ANSI B18.5 -1978

1 Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.

2 The minimum radius is one half of the value shown.

ANSI B18.5 -1978

STAINLESS STEEL HEX LAG SCREWS

Nominal Size1,or Basic,Product Diameter		E		F			G		H			S	R
		Body or,Shoulder Diameter		Width Across Flats			Width Across,Corners		Height			Shoulder,Length	Radius of Fillet
		Max	Min	Basic	Max	Min	Max	Min	Basic	Max	Min	Min	Max	Min
NO.10	0.1900	0.199	0.178	9/32	0.281	0.271	0.323	0.309	1/8	0.140	0.110	0.094	0.03	0.01
1/4	0.2500	0.260	0.237	7/16	0.438	0.425	0.505	0.484	11/64	0.188	0.150	0.094	0.03	0.01
5/16	0.3125	0.324	0.298	1/2	0.500	0.484	0.577	0.552	7/32	0.235	0.195	0.125	0.03	0.01
3/8	0.3750	0.388	0.360	9/16	0.562	0.544	0.650	0.620	1/4	0.268	0.226	0.125	0.03	0.01
7/16	0.4375	0.452	0.421	5/8	0.625	0.603	0.722	0.687	19/64	0.316	0.272	0.156	0.03	0.01
1/2	0.5000	0.515	0.482	3/4	0.750	0.725	0.866	0.826	11/32	0.364	0.302	0.156	0.03	0.01
5/8	0.6250	0.642	0.605	1-15/16	0.938	0.906	1.083	1.033	27/64	0.444	0.378	0.312	0.06	0.02
3/4	0.7500	0.768	0.729	1-1/8	1.125	1.088	1.299	1.240	1/2	0.524	0.455	0.375	0.06	0.02
7/8	0.8750	0.895	0.852	1-5/16	1.312	1.269	1.516	1.447	37/64	0.604	0.531	0.375	0.06	0.02
1	1.0000	1.022	0.976	1-1/2	1.500	1.450	1.732	1.653	43/64	0.700	0.591	0.625	0.09	0.03
1-1/8	1.1250	1.149	1.098	1-11/16	1.688	1.631	1.949	1.859	3/4	0.780	0.658	0.625	0.09	0.03
1-1/4	1.2500	1.277	1.223	1-7/8	1.875	1.812	2.165	2.066	27/32	0.876	0.749	0.625	0.09	0.03

ANSIB18.21–1981

STAINLESS STEEL SLOTTED FLAT COUNTERSUNK HEAD MACHINE SCREWS

Nominal Size1,or Basic,Bolt Diameter		L2	A		H2	J		T		F4		G4
		These Lengths or Shorter are Undercoat	Head Diameter		Head,Height,Ref	Slot Width		Slot Depth		Protrusion Above Gaging,Diameter		Gaging,Diameter
		These Lengths or Shorter are Undercoat	Max Edge Sharp	Min. EdgeRounded or Flat	Head,Height,Ref	Max	Min	Max	Min	Max	Min	Gaging,Diameter
0000	0.0210	–	0.043	0.037	0.011	0.008	0.004	0.007	0.003	*	*	*
000	0.0340	–	0.064	0.058	0.016	0.011	0.007	0.009	0.005	*	*	*
00	0.0470	–	0.093	0.085	0.028	0.017	0.010	0.014	0.009	*	*	*
0	0.0600	1/8	0.119	0.099	0.035	0.023	0.016	0.015	0.010	0.026	0.016	0.078
1	0.0730	1/8	0.146	0.123	0.043	0.026	0.019	0.019	0.012	0.028	0.016	0.101
2	0.0860	1/8	0.172	0.147	0.051	0.031	0.023	0.023	0.015	0.029	0.017	0.124
3	0.0990	1/8	0.199	0.171	0.059	0.035	0.027	0.027	0.017	0.031	0.018	0.148
4	0.1120	3/16	0.225	0.195	0.067	0.039	0.031	0.030	0.020	0.032	0.019	0.172
5	0.1250	3/16	0.252	0.220	0.075	0.043	0.035	0.034	0.022	0.034	0.020	0.196
6	0.1380	3/16	0.279	0.244	0.083	0.048	0.039	0.038	0.024	0.036	0.021	0.220
8	0.1640	1/4	0.332	0.292	0.100	0.054	0.045	0.045	0.029	0.039	0.023	0.267
10	0.1900	5/16	0.385	0.340	0.116	0.060	0.050	0.053	0.034	0.042	0.025	0.313
12	0.2160	3/8	0.438	0.389	0.132	0.067	0.056	0.060	0.039	0.045	0.027	0.362
1/4	0.2500	7/16	0.507	0.452	0.153	0.075	0.064	0.070	0.046	0.050	0.029	0.424
5/16	0.3125	1/2	0.635	0.568	0.191	0.084	0.072	0.088	0.058	0.057	0.034	0.539
3/8	0.3750	9/16	0.762	0.685	0.230	0.094	0.081	0.106	0.070	0.065	0.039	0.653
7/16	0.4375	5/8	0.812	0.723	0.223	0.094	0.081	0.103	0.066	0.073	0.044	0.690
1/2	0.5000	3/4	0.875	0.775	0.223	0.106	0.091	0.103	0.065	0.081	0.049	0.739
9/16	0.5625	–	1.000	0.889	0.260	0.118	0.102	0.120	0.077	0.089	0.053	0.851
5/8	0.6250	–	1.125	1.002	0.298	0.133	0.116	0.137	0.088	0.097	0.058	0.962
3/4	0.7500	–	1.375	1.230	0.372	0.149	0.131	0.171	0.111	0.112	0.067	1.186

ANSI B18.6.3 -1972

1 Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.

*Not practical to gage.

ANSI B18.6.3–1972

STAINLESS STEEL SLOTTED PAN HEAD MACHINE SCREWS

Nominal Size1,orBasic,Product Diameter		A		H		R	J		T
		Head Diameter		Head Height		Head Radius	Slot Width		Slot Depth
		Max	Min	Max	Min	Max	Max	Min	Max	Min
0000	0.0210	0.042	0.036	0.016	0.010	0.007	0.008	0.004	0.008	0.004
000	0.0340	0.066	0.060	0.023	0.017	0.010	0.012	0.008	0.012	0.008
00	0.0470	0.090	0.082	0.032	0.025	0.015	0.017	0.010	0.016	0.010
0	0.0600	0.116	0.104	0.039	0.031	0.020	0.023	0.016	0.022	0.014
1	0.0730	0.142	0.130	0.046	0.038	0.025	0.026	0.019	0.027	0.018
2	0.0860	0.167	0.155	0.053	0.045	0.035	0.031	0.023	0.031	0.022
3	0.0990	0.193	0.180	0.060	0.051	0.037	0.035	0.027	0.036	0.026
4	0.1120	0.219	0.205	0.068	0.058	0.042	0.039	0.031	0.040	0.030
5	0.1250	0.245	0.231	0.075	0.065	0.044	0.043	0.035	0.045	0.034
6	0.1380	0.270	0.256	0.082	0.072	0.046	0.048	0.039	0.050	0.037
8	0.1640	0.322	0.306	0.096	0.085	0.052	0.054	0.045	0.058	0.045
10	0.1900	0.373	0.357	0.110	0.099	0.061	0.060	0.050	0.068	0.053
12	0.2160	0.425	0.407	0.125	0.112	0.078	0.067	0.056	0.077	0.061
1/4	0.2500	0.492	0.473	0.144	0.130	0.087	0.075	0.064	0.087	0.070
5/16	0.3215	0.615	0.594	0.178	0.162	0.099	0.084	0.072	0.106	0.085
3/8	0.3750	0.740	0.716	0.212	0.195	0.143	0.094	0.081	0.124	0.100
7/16	0.4375	0.863	0.837	0.247	0.228	0.153	0.094	0.081	0.142	0.116
1/2	0.5000	0.987	0.958	0.281	0.260	0.175	0.106	0.091	0.161	0.131
9/16	0.5625	1.041	1.000	0.315	0.293	0.197	0.118	0.102	0.179	0.146
5/8	0.6250	1.172	1.125	0.350	0.325	0.219	0.133	0.116	0.197	0.162
3/4	0.7500	1.435	1.375	0.419	0.390	0.263	0.149	0.131	0.234	0.192

ANSI B18.6.3–1972
1 Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.

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