How do you soften a Grade 8 bolt?

Can you break Grade 8 bolts?

Grade-8 bolts are difficult to cut, but can be done with the use of a high-speed cutoff wheel. … Put your safety glasses on and install the diamond cut-off wheel to the Dremel tool. Mark the bolt where you want to cut it and run a nut onto the threads of the bolt, past where you will cut.

Is a Grade 8 bolt hardened?

Grade 8 bolts have been hardened more than grade 5 bolts. Thus they are stronger and are used in demanding applications such as automotive suspensions. Grade 8 bolts have 6 evenly spaced radial lines on the head. Grade G is roughly equivalent to Grade 8.

Is a Grade 8 bolt strong?

Commercial-grade 8 bolts are the strongest option available. They’re made from medium carbon alloy steel and have markings that include six raised dashes. The psi of the bolt is 150,000, meaning that it can withstand great deals of pressure because of the way it was quenched and tempered.

What is the yield strength of a Grade 8 bolt?

The nominal size of the grade 8 bolts can be from 1/4″ to 1 1/2″. The minimum yield strength of this grade bolt is 130,000 psi. A maximum of 120,000 psi of tensile force (proof load) can be applied to grade 8 bolts.

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What grade are hardened bolts?

Grade 5 bolts are case hardened, meaning the bolt has been heated enough to hardened the outside of the bolt but not enough to harden the inside portion. Grade 5 bolts are identified by 3 evenly spaced radial lines on the head.

What type of drill bit is best for hardened steel?

Go to a hardware or home improvement store for a cobalt bit that is designed specifically for drilling through steel. You want a cobalt bit, as it’s a type of high-speed steel (HSS) that has more cobalt in it and is strong enough to cut through hardened steel.

Can hardened steel be drilled?

Drills for Hardened Steel. These carbide tipped drills are ideal for locksmiths, auto mechanics or any operator drilling into hardened steel. Can be used to drill out broken bolts, studs, taps and drill bits. They also cut hard steel such as safes, bearing races and dies.

What kind of steel are Grade 8 bolts made of?

Grade 8 (SAE J429) is a medium carbon alloy steel with one of the highest tensile strengths available. With a minimum tensile strength of 150 ksi and a minimum yield of 130 ksi, Grade 8 has a higher tensile and yield strength than other steel grades such as Grade 5 and B7.

What is the strongest metal for bolts?

The strongest commercial-quality bolt is grade 8, marked by six raised dashes; its medium-carbon alloy steel has been quenched and tempered to achieve a tensile strength of 150,000 psi.