What does grade A325 mean?

ASTM A325 is an ASTM International standard for heavy hex structural bolts, titled Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength. It defines mechanical properties for bolts that range from 1⁄2 to 11⁄2 inches (13 to 38 mm) in diameter.

Is Grade 8 stronger than A325?

Strength Differences A325 bolts are typically manufactured from a medium carbon steel (although they can be made from an alloy) while SAE grade 8 bolts are made from a medium carbon alloy steel. Grade 8 bolts are significantly stronger than an A325.

What is A325 nut?

These nuts are designed to secure ASTM A325 bolts in structural joints. Also known as heavy hex nuts, they are about 10% wider and taller than standard hex nuts. Hot-dipped galvanized steel nuts have a thick coating for good corrosion resistance. They must be used with other hot-dipped galvanized fasteners.

What is ASTM A325 Type 1?

ASTM A325 Type 1 is a standard material specification for high strength carbon steel fasteners, for use in high tensile structural bolting and other general purpose applications.

What nuts go with A325 bolts?

Recommended Nuts and Washers The recommended grade of nut for an ASTM A325 structural bolt is ASTM A563 Grade D, DH, or C. ASTM A194 2H is also an acceptable substitute. These ASTM grades are all high strength and go through a heat treating process required to develop their mechanical characteristics.

Are A325 bolts galvanized?

The two most common types of structural bolt coatings for F3125 Grade A325 bolts are hot-dip galvanized and mechanical galvanized. F3125 Grade A490 bolts can be coated in a zinc/aluminum corrosion protective coating or a zinc-rich base coat and aluminum coating.

What is the hardest grade bolt?

grade 8
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 bolt is the strongest?

Grade 9 structural bolts, also known as grade 9 hex cap screws, are one the strongest structural bolts that can be used today. While the typical grade 8 bolt has a tensile strength of 150,000 PSI, a grade 9 bolt has a tensile strength of 180,000PSI.

Is A325 a high strength bolt?

Prior to its withdrawal in 2016, the ASTM A325 specification covered high strength heavy hex structural bolts from 1/2″ diameter through 1-1/2″ diameter. These bolts are intended for use in structural connections and therefore have shorter thread lengths than standard hex bolts.

What material is A325 bolt?

ASTM A325 Specification for heat treated carbon & weathering steel bolts, steel with 120 ksi Minimum Tensile Strength, for use in structural bolting applications. ASTM A325 specification covers two types of quenched and tempered steel heavy hex bolts in metric and imperial sizes for structural purpose.

Is A325 galvanized?

A325-1 Structural Bolts are available in medium carbon steel, in plain or hot dip galvanized finishes. Often used on structural steel joints in heavy construction, structural bolts are also heat treated.

What is the tensile strength of A325 bolts?

120,000 PSI
Grade A325 bolts are available in diameters from 1/2 to 1-1/2 inch (for diameters greater than 1-1/2, ASTM A449 specifications should be considered) with a minimum tensile strength of 120,000 PSI.

What is the strongest grade of bolt?

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.

Are Grade 8 bolts more brittle than Grade 5?

It is true that grade 8 bolts are more brittle than grade 5. In general (although not always the case), steels that have a higher strength are less ductile . Grade 8 bolts have a higher strength and, therefore, would require fewer bolts in a joint than grade 5.

What is Grade 5 bolt strength?

They have a tensile strength of 60,000 PSI. Grade 5 bolts are a heat treated carbon bolt. Hardened to increase its strength, it’s most commonly found in automotive applications. Grade 5 bolts have 3 evenly spaced radial lines … resembling an airplane propeller.

What are the strength of bolt grades?

Stainless commonly comes in grades 18.8 (304) or T316. Stainless steel bolts are rated for corrosion resistance. Bolt strength is rated in PSI (pounds per square inch). A stainless steel bolt has the same PSI rating as a grade 5 bolt (125,000 PSI). A grade 8 bolt has a stronger rating with a PSI of 150,000.