What is the hardness of a Grade 8 bolt?
Materials - Medium Carbon Steel Bolts in SAE J429 (Grades 2, 5 and 8)
|Grade||Nominal size, inches||Core hardness, Rockwell|
|2||¾ - 11/2 inch||B70 to B100|
|5||¼ - 1 inch||C25 to C34|
|1 - 1-1/2 inches||C19 to C30|
|8||¼ - 1-1/2 inches||C33 to C39|
What is a 10.9 grade bolt?
Bolt Grade Markings and Strength Chart
|Grade and Material||Mechanical Properties|
|Proof Load (psi)|
|Class 8.8 Medium carbon steel, quenched and tempered||600|
|Class 10.9 Alloy steel, quenched and tempered||830|
|Class 12.9 Alloy steel, quenched and tempered||970|
Is a 10.9 Bolt stronger than Grade 8?
Also known as A-2 stainless, 18-8 is the most common grade of stainless steel for general use. A tempered medium carbon steel. Class 10.9 is stronger than class 8.8, and is commonly found in high strength automotive applications. Class 10.9 is similar to grade 8.
What is medium carbon steel?
Also known as mild steel, it is a low-cost material that is easy to shape. While not as hard as higher-carbon steels, carburizing can increase its surface hardness. Medium Carbon Steel – Composition of 0.29%-0.54% carbon, with 0.60%-1.65% manganese.
What is a grade 8.8 bolt?
The first digit relates to the ultimate strength of the material, whilst the second is the ratio of yield stress to ultimate strength. Thus grade 4.6 bolts have an ultimate material strength of 400N/mm2 and the uield (or proof) stress is 60% of the ultimate strength.
How many marks are on a Grade 8 bolt?
Grade 5 bolts have 3 marks or lines on the head that are in the shape of a “Y”. Grade 8 bolts have 6 marks on the head.
What is a Grade 8 nut?
A grade 8 bolt is stronger than the more commonly used grade 5. It is made of alloy steel and has six radial lines on the top of the bolt head. Grade 8 bolts have a tensile strength of 150,000 pounds per square inch.
What is turn of the nut method?
Failure to do so will result in inadequate bolt pretension and loose connections. Turn-of-Nut is performed by rotating the nut or bolt of a fastener assembly a specific turn angle based on the fastener's length, and diameter while restraining the unturned element from rotating.
What is stronger grade 5 or 8 bolt?
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.
What is a Grade 8 washer?
Grade 8 SAE Flat Washers are manufactured from High Strength Alloy Steel. It is recommended that a Grade 8 Flat Washer be used with Grade 8 Nuts and Bolts.
What is a grade G nut?
Flange nuts, prevailing torque, Grade 8 (grade G) steel plain finish. Nut size (A.K.A. diameter) is the size bolt that the nut is used with.
What is a Grade 9 bolt?
Grade 9 Hex Head. The Grade 9 Bolting system develops the highest clamp force available in a standard bolt/nut assembly and it is frequently referred to by one of the folowing trade names: L9, PFC9, or F911. Special Alloy steels and heat treatments are used to achieve 180,000 psi tensile strength.
Which is stronger grade 8 or stainless steel?
Grade 8 bolts have a proof load of 120,000 pounds per square inch. The minimum strength of stainless steel bolts is 40,000 to 90,000 psi. The minimum strength of grade 8 bolts is 130,000 psi. Grade 8 bolts are much stronger than stainless steel.
12.9 grade steel means that a component manufactured form this grade of steel has 12X100 N/mm^2 tensile strength and 9 is a multiplier means 90% of 1200 = 1080 N/mm^2 is the yield strength of the grade. Similarly we also have grade 8.8 , 10.9 , 6.8 also.
Updated: 26th August 2018