Inch Series Socket Head Shoulder Screws

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Inch Series Socket Head Shoulder Screws

Inch Series Socket Head Shoulder Screws size chart per. ASME B18.3 size and engineering date table chart.

Shoulder Screw

Shoulder screw deatails

Applicable Standards: ASME B18.3.
Tensile Strength: 140,000psi min.,
Yield Strength 120,000 psi min.
Hardness: R_C32 minimum.

Nominal Shoulder Diameter	D(1) Shoulder Diameter Max. - Min.	A Head Diameter Max. Min.	H Head Side Height Max. Min.	S Head Height Min.	J Hex Socket Size Nominal	T Key Engagement Min.	E(3) Thread Length Basic
1/4	0.2480 - 0.2460	0.375 - 0.357	0.188 - 0.177	0.157	1/8	0.094	0.375
5/16	0.3105 - 0.3085	0.438 - 0.419	0.219 - 0.209	0.183	5/32	0.117	0.438
3/8	0.3730 - 0.3710	0.562 - 0.543	0.250 - 0.240	0.209	3/16	0.141	0.500
1/2	0.4980 - 0.4960	0.750 - 0.729	0.312 - 0.302	0.262	1/4	0.188	0.625
5/8	0.6230 - 0.6210	0.875 - 0.853	0.375 - 0.365	0.315	5/16	0.234	0.750
3/4	0.7480 - 0.7460	1.000 - 0.977	0.500 - 0.490	0.421	3/8	0.281	0.875
1	0.9980 - 0.9960	1.312 - 1.287	0.625 - 0.610	0.527	1/2	0.375	1.000
1 1/4	1.2480 - 1.2460	1.750 - 1.723	0.750 - 0.735	0.633	5/8	0.469	1.125
1 1/2	1.4980 - 1.4960	2.125 - 2.095	1.000 - 0.980	0.842	7/8	0.656	1.500
1 3/4	1.7480 - 1.7460	2.375 - 2.345	1.125 - 1.105	0.948	1	0.750	1.750
2	1.9980 - 1.9960	2.750 - 2.270	1.250 - 1.230	1.054	1 1/4	0.937	2.000

Nominal Shoulder Diameter	M Head Fillet Ext. Above D Max. Min.	K Shoulder Neck Diameter Min.	F Shoulder Neck Width Max.	Dt Basic Thread Diameter And Pitch	G Thread Neck Diameter Max. Min.	I Thread Neck Width Max.	N Thread Neck Fillet Max. Min.
1/4	0.014 - 0.009	0.227	0.093	#10-24	0.142 - 0.133	0.083	0.023 - 0.017
5/16	0.017 - 0.012	0.289	0.093	1/4-20	0.193 - 0.182	0.100	0.028 - 0.022
3/8	0.020 - 0.015	0.352	0.093	5/16-18	0.249 - 0.237	0.111	0.031 - 0.025
1/2	0.026 - 0.020	0.477	0.093	3/8-16	0.034 - 0.291	0.125	0.035 - 0.029
5/8	0.032 - 0.024	0.602	0.093	1/2-13	0.414 - 0.397	0.154	0.042 - 0.036
3/4	0.039 - 0.030	0.727	0.093	5/8-11	0.521 - 0.502	0.182	0.051 - 0.045
1	0.050 - 0.040	0.977	0.125	3/4-10	0.638 - 0.616	0.200	0.055 - 0.049
1 1/4	0.060 - 0.050	1.227	0.125	7/8-9	0.750 - 0.726	0.222	0.062 - 0.056
1 1/2	0.070 - 0.060	1.478	0.125	1 1/8-7	0.964- 0.934	0.286	0.072 - 0.066
1 3/4	0.080 - 0.070	1.728	0.125	1 1/4-7	1.089 - 1.059	0.286	0.072 - 0.066
2	0.090 - 0.080	1.978	0.125	1 1/2-6	1.307 - 1.277	0.333	0.102 - 0.096

Notes:

1. Thread Length Tolerance: -0.020in. for sizes up to 3/8 in., inclusive, and -0.030 for sizes over 3/8 inch.

2. Concentricity: Head shall be concentric with the shoulder within 1 percent (2 percent total runout) of the nominal diameter D or 0.003 inch (0.006 inch total runout), whichever is greater. Concentricity, parallelism, bow and squareness of shoulder to thread shall be within 0.005 inch total runout per inch of shoulder length, with a maximum of 0.025 inch, when firmly seated against the shoulder in a threaded bushing, and checked on the shoulder a distance of 2F from the underside of the head. Threads of bushing shall be basic size, and busing OD and ends shall be concentric and square with the axis.

3. Bearing surface: The plane of the bearing surface of the head shall be perpendicular to the axis of the shoulder within a maximum deviation of 2 degrees.

Standard Lengths

Nominal Shoulder (Screw) Length	Standard Length Increment
1/4 through 3/4	1/8
3/4 through 5	1/4
Over 5	1/2

Mechanical Properties and Tightening Torques

Nominal Shoulder Diameter	Nominal Thread Size	Tensile Strength Threads Pounds Min.	Single Shear Strength		Hex Key Size	Tightening Torque Inch-Pounds
Nominal Shoulder Diameter	Nominal Thread Size	Tensile Strength Threads Pounds Min.	Pounds Min. Thread Neck	Shoulder	Hex Key Size	Tightening Torque Inch-Pounds
1/4	10-24	2540	1250	4515	1/8	50
5/16	1/4-20	4610	2340	7100	5/32	125
3/8	5/16-18	7600	3970	10280	3/16	265
1/2	3/8-16	11240	5985	18350	1/4	470
5/8	1/2-13	20570	11140	28785	5/16	1150
3/4	5/8-11	32770	17800	41515	3/8	2000
1	3/4-10	48430	26800	74000	1/2	4000

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