ARP M10 x 1.25, .375 height, Nut Kit - 8740 Chrome Moly M10-1.25 - Socket Size: 16mm 12pt
Both 4130 and 8740 chrome moly are alloy steels with similar chemistry. The 4130 has only .3% carbon and can’t be hardened as high as 8740, which has .4% carbon. Also, 8740 has about .45% nickel and 4130 has none. Both have moly (most alloy steels have moly). The chromium content of 4130 is slightly higher, .95% instead of .55%. However, 8740 is generally considered to have slightly better toughness due to the nickel.
Features
- 8740 Chrome Moly
- 0.375 Height
