Below is a general manufacturer product group description. Please note the information below is not item specific. Item specifics are above in product details.

We have a few choices when it comes to choosing a piston pin. 5115 Material pins are chromium alloy and steel case hardened to 58-64 Rockwell C designed for normal wear and tear. 52100 Material Pins are high carbon chromium-bearing steel made of aircraft quality alloy and case hardened to 54-56 Rockwell C for high load capacity. 9310 Material Pins are high quality low carbon and are case hardened to 59-63 Rockwell C for turbo or nitrous applications.
5115 Material Pin


Standard grade chromium alloy steel
Case hardened to 58-64 Rockwell C
Ground to a surface finish of .15 Ra or better
Designed to withstand the normal wear and tear of an aftermarket engine


52100 Material Pin


High carbon, chromium-bearing steel
Aircraft quality alloy
Case hardened to 54-56 Rockwell C
Through hardened
Ground to a fine finish
Designed for high load capacity
Designed for outstanding wear and abrasion resistance


9310 Material Pin


High quality, low carbon, case hardened steel
Case hardened to 59-63 Rockwell C
Ground to a superfinish (.025 Ra or better)
Designed for use in applications which require high surface strength combined with high core toughness
Excellent to use in applications where high contact stress is combined with high shock and impact loading, such as turbo / nitrous applications