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Socket Shoulder Bolt

ASTM A574 Socket Head Shoulder Bolts, sometimes called stripper bolts or just shoulder bolts, have a smooth shoulder that is larger than the thread diameter, running down the majority of the length of the fastener. The shoulder, having a larger diameter than the threads allows the fastener to be used in rotating applications such as pulley shafts, bearing pins, axles, and pivot points. The thread length is standard for a given diameter. Unlike most fasteners, socket head shoulder bolts are not sized by the thread diameter and length under the head, rather the diameter and length of the shoulder itself. Dimensional specifications are governed by ASME B18.3.

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Governing Standards
Mechanical Properties
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Dimensional Specifications

Dimensional Specifications

Dimensional SpecificationsAlloy Steel Socket Shoulder Bolt

Per ASME B18.3-2003
Size	Nominal	D		A		H		C	J		T	M	R
		Shoulder Diameter		Head Diameter		Head Height		Chamfer or Radius	Hexagon Socket Size		Key Engage- ment	Fillet Transition Diameter	Head Fillet Radius
		Max	Min	Max	Min	Max	Min	Max	Nom		Min	Max	Min
1/4	0.2500	0.2480	0.2460	0.3750	0.3570	0.1880	0.1770	0.0200	1/8	0.1250	0.0940	0.2760	0.0090
5/16	0.3120	0.3105	0.3085	0.4380	0.4190	0.2190	0.2090	0.0260	5/32	0.1560	0.1170	0.3450	0.0120
3/8	0.3750	0.3730	0.3710	0.5620	0.5430	0.2500	0.2400	0.0310	3/16	0.1880	0.1410	0.4130	0.0150
1/2	0.5000	0.4980	0.4960	0.7500	0.7290	0.3120	0.3020	0.0400	1/4	0.2500	0.1880	0.5500	0.0200
5/8	0.6250	0.6230	0.6210	0.8750	0.8530	0.3750	0.3650	0.0500	5/16	0.3120	0.2340	0.6870	0.0240
3/4	0.7500	0.7480	0.7460	1.0000	0.9770	0.5000	0.4900	0.0600	3/8	0.3750	0.2810	0.8260	0.0300
1	1.0000	0.9980	0.9960	1.3120	1.2870	0.6250	0.6100	0.0830	1/2	0.5000	0.3750	1.0980	0.0400
1 1/4	1.2500	1.2480	1.2460	1.7500	1.7230	0.7500	0.7350	0.1020	5/8	0.6250	0.4690	1.3680	0.0500
1 1/2	1.5000	1.4980	1.4960	2.1250	2.0950	1.0000	0.9800	0.1380	7/8	0.8750	0.6560	1.6380	0.0600
1 3/4	1.7500	1.7480	1.7460	2.3750	2.3450	1.1250	1.1050	0.1570	1	1.0000	0.7500	1.9080	0.0700
2	2.0000	1.9980	1.9960	2.7500	2.7200	1.2500	1.2300	0.1760	1 1/4	1.2500	0.9370	2.1780	0.0800
See Notes		1		8								6

Size	Nominal	K	F	D1			G		I	N		E	P
		Shoulder Neck Diameter	Shoulder Neck Width	Nominal Thread Diameter		Threads per Inch	Thread Neck Diameter		Thread Neck Width	Thread Neck Fillet		Thread Length	Chamfer or Radius
		Min	Max	Nominal Thread Diameter		Threads per Inch	Max	Min	Max	Max	Min	Basic	Max
1/4	0.2500	0.2270	0.0930	#10	0.1900	24	0.142	0.133	0.083	0.023	0.017	0.375	0.010
5/16	0.3120	0.2890	0.0930	1/4	0.2500	20	0.193	0.182	0.100	0.028	0.022	0.438	0.010
3/8	0.3750	0.3520	0.0930	5/16	0.3125	18	0.249	0.237	0.111	0.031	0.025	0.500	0.010
1/2	0.5000	0.4770	0.0930	3/8	0.3750	6	0.304	0.291	0.125	0.035	0.029	0.625	0.010
5/8	0.6250	0.6020	0.0930	1/2	0.5000	13	0.414	0.397	0.154	0.042	0.036	0.750	0.015
3/4	0.7500	0.7270	0.0930	5/8	0.6250	11	0.521	0.502	0.182	0.051	0.045	0.875	0.015
1	1.0000	0.9770	0.1250	3/4	0.7500	10	0.638	0.616	0.200	0.056	0.049	1.000	0.020
1 1/4	1.2500	1.2270	0.1250	7/8	0.8750	9	0.750	0.726	0.222	0.062	0.056	1.125	0.020
1 1/2	1.5000	1.4780	0.1250	1 1/8	1.1250	7	0.964	0.934	0.286	0.072	0.066	1.500	0.020
1 3/4	1.7500	1.7280	0.1250	1 1/4	1.2500	7	1.089	1.059	0.286	0.072	0.066	1.750	0.020
2	2.0000	1.9780	0.1250	1 1/2	1.5000	6	1.307	1.277	0.333	0.102	0.096	2.000	0.020
See Notes		6	6	10			7		7	7

1. Shoulder. Shoulder refers to the enlarged unthreaded portion of the screw, the diameter of which serves as the basis for derivation of the nominal size.
6. Neck and Fillet Under Head. Screws may be necked under the head at the option of the manufacturer. The fillet extension above D, at the intersection of the head bearing surface and neck or shoulder, shall be controlled by maximum dimension M and minimum radius of curvature R. (See Detail Y)
7. Neck Under Shoulder. The neck under the shoulder shall allow the shoulder to seat against the face of a standard basic GO thread ring gage.
8. Head Diameter. The head may be plain or knurled at the option of the manufacturer.
10. Threads. Threads shall be Unified external thread: Class 3A, UNC Series. Acceptability is to be based on System 22, ASME B1.3M. Class 3A does not provide a plating allowance. When plated products are required, it is recommended that they be procured from the manufacturer.

Socket Shoulder Bolt

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Body Diameter Length Thread Diameter Thread Pitch Thread Length Item # Availability Price Quantity UOM

1/4

3/8

#10

0.3750

SCSB0250037

In Stock

$1.29155/EA

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1/4 X 3/8 X #10-24 A574 ALLOY STEEL SOCKET SHOULDER BOLT

$1.29155/EA

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Quantity	Price
Quantity	Price
1	$1.29155/ EA
840	$1.20426/ EA
3340	$1.13717/ EA
14990	$0.77357/ EA

5/16

3/8

1/4

0.4375

SCSB0310037

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$1.37445/EA

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5/16 X 3/8 X 1/4-20 A574 ALLOY STEEL SOCKET SHOULDER BOLT

$1.37445/EA

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Quantity	Price
Quantity	Price
1	$1.37445/ EA
560	$1.28155/ EA
2220	$1.21016/ EA
9990	$0.82322/ EA

3/8

5/16

0.5000

SCSB0370037

In Stock

$1.29331/EA

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3/8 X 3/8 X 5/16-18 A574 ALLOY STEEL SOCKET SHOULDER BOLT

$1.29331/EA

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In Stock

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Quantity	Price
Quantity	Price
1	$1.29331/ EA
320	$1.2059/ EA
1250	$1.13872/ EA
5630	$0.77462/ EA

ASTM A574	Covers the requirements for quenched and tempered alloy steel hexagon socket-head cap screws, 0.060 through 4 in. in diameter where high strength is required.
ASME B18.3	Covers the complete general and dimensional data for various types of hexagon socket cap screws, shoulder screws, set screws, and hexagon keys recognized as an American National Standard.
ASME B1.1 UNC & UNF Class 2A	Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

Alloy Steel, Quenched & Tempered			Per ASTM A574-13
Nominal Diameter	Full-Size Screws		Machined Test Specimen				Product Hardness
	Tensile Strength	Proof Load	Yield Strength at 0.2% offset	Tensile Strength	Elongation in 5D	Reduction of Area	Product Hardness
	ksi	ksi	ksi	ksi	%	%	Rockwell
1/2" & under	180 min	140	153 min	180 min	10 min	35 min	39-45 HRC
over 1/2"	170 min	135	153 min	170 min	10 min	35 min	37-45 HRC

Per ASTM A574-13
Material	Heat Analysis				Product Analysis
	Carbon	Phosphorus	Sulfur	Alloying Elements	Carbon	Phosphorus	Sulfur	Alloying Elements
	% by weight	% by weight	% by weight	Alloying Elements	% by weight	% by weight	% by weight	Alloying Elements
Quenched and tempered alloy steel	0.33 min	0.035 max	0.040 max	(1)	0.31 min	0.040 max	0.045 max	(1)

Socket Shoulder Bolt

Technical Data

Governing Standards

Governing StandardsAlloy Steel Socket Shoulder Bolt

Mechanical Properties

Mechanical PropertiesAlloy Steel Socket Shoulder Bolt

Chemical Properties

Chemical PropertiesAlloy Steel Socket Shoulder Bolt

Dimensional Specifications

Dimensional SpecificationsAlloy Steel Socket Shoulder Bolt

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1/4 X 3/8 X #10-24 A574 ALLOY STEEL SOCKET SHOULDER BOLT

5/16 X 3/8 X 1/4-20 A574 ALLOY STEEL SOCKET SHOULDER BOLT

3/8 X 3/8 X 5/16-18 A574 ALLOY STEEL SOCKET SHOULDER BOLT