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Jul292013

04:29:57 pm

Shoulder studs

Shoulder studs, or S studs can be used in all different types of applications. Shoulder studs can either be welded to a flat surface or to the inside or outside of an angle. They are also used as mountings for panels and hardware when a standoff shoulder is necessary. The length you will see listed of a shoulder stud is the length of the stud before it is welded. Studs with diameters of half an inch and lower will be about an eighth of an inch shorter when welded. Those with diameters of 5/8 and will be approximately 3/16 shorter after welding.

 

The studs are generally made out of low carbon steel but are also available in stainless steel that can be welded. The material that the studs is made of depends on the range of temperature that the service will be in. Shoulder studs made by Nelson SBL studs have a weld base diameter that is larger than the threaded extension diameter. The weld base diameters they are available in range from through 1. They have threaded extension sizes up to 7/8-9. The thread size and the partner number are determined by the chuck size.

 

Shoulder bolts are used as bearings and spacers. They are used in applications such as shafts for cam rollers and other rotating parts, and as pivots and stud bolts, and also as bearing pins for swings arms, links and levers. They are often used with bronze sleeve bearings and are used as guides in blanking and forming presses, and in punch and die operations. S bolts usually have a cylinder shaped head, a cylindrical shoulder, and a threaded section. They have a small area in the middle of the threads and shoulder which is undercut to allow for a tight fit against the mating surface. S bolts are used along with nuts and tapped holes. The shoulder part is the enlarged and unthreaded part of the screw, which is the basis of the nominal size. The size of the shoulder ranges between 0.002 and 0.004 of the nominal size. A half inch shoulder bolt will have a shoulder diameter of 0.498 maximum.

 

Since s bolts have a hex socket, they should be tightened with a hex driver. When the size is 1 and under, the hex socket will be half the shoulder diameter. For sizes of 1 to 2, the hex socket is a little larger than half. Since the s bolt is internally wrenched, clearance around the wrench head is not needed for the bolt to be installed. S bolts are standardly finished with a plain steel finish so there is no inclination to rust.

 

The following is a chart of the size dimensions of shoulder studs.

 

Nominal Size
(Shoulder Dia.)

Head
Dia.

Head
Height

Hex
Soc.
Size

Thread

Fraction

Decimal

Max

Max

Size

Length

1/4

0.250

3/8

3/16

1/8

10-24

3/8

5/16

0.312

7/16

7/32

5/32

1/4-20

7/16

3/8

0.375

9/16

1/4

3/16

5/16-18

1/2

1/2

0.500

3/4

5/16

1/4

3/8-16

5/8

5/8

0.625

7/8

3/8

5/16

1/2-13

3/4

3/4

0.750

1

1/2

3/8

5/8-11

7/8

 

Shoulder studs

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