Mar 24, 2014 · Mechanical specs of 4130 and ETD-150 are both on the minimum side of the Grade 8 spec. Grade 8 specs serve the fastener industry where shear, fatigue, bending, and …

Jun 30, 2022 · 4140 (a likely material for a grade 8 fastener) in 1/2 diameter and less will just self quench if heated up past A3 in a spot like this. so softening in place is most likely not gonna …

Jul 30, 2010 · Grade 8's made of stainless are counterfeit or a different class of bolt. They are heat treated and tempered so they will have a rockwell of 25-40. With carbide tooling they cut …

Jul 1, 2020 · Currently working on a quote and had questions on processing for a general call out of "Grade 8.8 Minimum " as a material requirement on a print. Was wondering If we just …

Jul 2, 2007 · grade 8 SAE J429 is made from medium carbon alloy steel, quenched and tempered proof load 120,000 psi, Yield strength (min)130,000 psi, tensile strength (min)150,000 psi

May 19, 2004 · Grade 8 are in the 175 ksi range. A common pre heat treat 4130 is ETD 150. It is chemically relatively unspecified, but produced to 150 ksi strength. There also used to be an …

May 11, 2016 · According to the charts I've seen 5/8 allen heads are <> 15/16 / 24mm dia, so how about an M42 HSS Rotabroach cutter, and drill the outside of the head away leaving the …

Oct 11, 2003 · I am searching for the best drill bit to drill .0625" hole in a 7/16"-14 grade 8 bolt. The hole location is across the flats and is used for safety wire. My test today was poor. The …

Jan 23, 2009 · A regular drill bit will make short work of a Grade 8 fastener. Thinking the thread form and the bolt head have slightlty improved material properties due to the compressive …

Dec 3, 2021 · You are already removing two of the requirements of grade 8 - heat treat after threading and rolling threads - It might be time to get engineer or at least client to sign off. You …