Shear pin selection

Taper pins are usually used as shear pins. The tapered hole drilled through the shaft and the attaching component can be drilled to locate the pin. The location being that part of the taper in which you find the shear forces desired. The pins come in many different sizes.

There is one prevailing standard in imperial sizes, the ASME B18.8.2

Here is a good reference guide

http://www.who-sells-it.com/images/catalogs/808/pdf_775.pdf

We use a friction type clutch to address this problem. Shear pins although great in theroy do leave a little to be desired. Using a friction type clutch allows EXACT settings to be made depending on the troque, load and speed of the device. We are having a lot less problems now than with shear pins.

Brass & make sure to leave a little gap between the shafts.

We have a similar case where we want to use a shear pin. Due to the low applied loads we are thinking of using a material with a relatively low shear strength. This makes us think to use some type engineering plastic or brass. The problem with brass (our first choice) is that the shear strength can range from 50 to 500 MPa. Can anyone advise on a) better material. b) more definite values for the shear strength of brass. c) why should one allow for a "little gap" between the sliding/rotating surfaces?

The shear force will depends on material which vary from batch to batch. You can get them to shear within a range but not exactly. You'll want it to be brittle, high hardness through and small diameter. You can grind standard size pin down to require diameter at the center. You should make a few and do test to make sure.

Pineapple

we are having redex make tension levller which is used for levelling flat sheet. their we use EN 8 material for shearing pin which working well.