What grade are metric socket head cap screws?

A: Standard inch socket head cap screws are not designated by a grade like hex cap screws. A standard inch socket head cap screw is 20% stronger than Grade 8 hex cap screws and 50% stronger than Grade 5 hex cap screws. Metric socket head cap screws are designated by classes – Class 8.8, Class 10.9 & Class 12.9.

What are the different grades of bolts?

There are several grades of bolts but the three common grades for SAE are 2, 5 and 8. The common class (grades) for metric are 5.8, 8.8, 10.9 and 12.9. Each grade has a specific bolt strength. No matter the system used to grade the bolts, the higher number means the stronger the bolt.

What is the highest grade of bolt?

grade 8 bolt
A grade 8 bolt is the highest grade SAE bolt. Grade 8 bolts have a minimum tensile strength of 150,000 PSI. As a comparison, the ASTM A325 bolt is roughly equivalent to the SAE grade 5. A grade 8 bolt would be one that meets ASTM A490 standards.

What is a metric bolt grade?

Metric Grades. The strength grade of a metric bolt, known as its property class, consists of two numbers separated by a dot. The property class is expressed in raised or depressed numerals on top or on the side of the bolt head, according to rules set by the International Standards Organization.

What are the different types of bolts?

There are dozens of different types of bolts, some of which include anchor bolts, arbor bolts, elevator bolts, hanger bolts, hex bolts, J bolts, lag bolts, rock bolts, shoulder bolts and U bolts. Additionally, bolts are available in a wide range of materials, including steel, stainless steel, bronze,…

What is an allen head bolt?

Definition of Allen bolt . hardware. : a bolt with a hexagonal socket in its head that is designed to be used with an Allen wrench The Allen bolt is integral to the crank and remains in it when the crank is removed from the spindle.— Eugene A. Sloane, Sloane’s New Bicycle Maintenance Manual, 1981.

What are the types of screw heads?

The most common types of machine screw head shapes are pan head, flat head, round head, oval head, truss head and hex head. While round heads are probably used most often, flat heads are particularly useful when the screw needs to be flush with the surface it’s screwed into.