Blackening Treatment of High Strength Bolts

The blackening treatment of high strength bolts mainly requires the appearance, including the following points: 1. The appearance of blackening treatment is blue black or dark black. 2. The crystal of the film is compact and uniform, and the product has no exposed bottom, no obvious color difference, no whitening and other abnormal phenomena. If [...]

By |July 10th, 2020|A490, ASTM International Standard, Bolt Types, Heavy Hex Bolts, Hex Bolts, High Strength Bolts, High Strength Structure Bolts|Comments Off on Blackening Treatment of High Strength Bolts

About Hot-dip Galvanized Hexagon Screw

The hot-dip galvanized hexagon screw is to place the bolt in the high-temperature zinc solution of 600 ℃ so that its surface is coated with a dark gray surface. The advantages of hot-dip galvanized hexagon screw are strong adhesion of zinc coating, thick coating and strong corrosion resistance. Hot dip galvanized bolts are used for [...]

By |June 25th, 2020|A490, ASTM International Standard, Bolt Types, Heavy Hex Bolts, Hexagon Bolt, High Strength Structure Bolts|Comments Off on About Hot-dip Galvanized Hexagon Screw

About High Strength Black Bolt

Production process of high strength black bolt: Rack mounting → oil removal by boiling alkali solution → water cleaning → rust removal by hydrochloric acid solution → water cleaning → boiling water heating → oxidation → water cleaning → saponification → water cleaning → self drying → hot oil soaking → oil control → inspection [...]

By |June 23rd, 2020|A325, A490, ASTM International Standard, Bolt Types, Heavy Hex Bolts, High Strength Bolts, High Strength Structure Bolts|Comments Off on About High Strength Black Bolt

Difference between High Strength Hexagon Bolt and Ordinary Bolt

From the following three aspects, the difference between high strength hexagon bolt and ordinary bolts is introduced. In terms of strength grade High strength hexagon bolts are widely used. The strength grades of 8.8s and 10.9s are commonly used, of which 10.9 is the most. The strength grade of ordinary bolts is lower, generally 4.4, [...]

By |June 15th, 2020|A325, A490, ASTM International Standard, Bolt Types, Heavy Hex Bolts, Hex Bolts, Hexagon Bolt, High Strength Bolts, High Strength Structure Bolts|Comments Off on Difference between High Strength Hexagon Bolt and Ordinary Bolt

Material and Performance of High Strength Hexagon Socket Bolt

As a small hardware component, high strength hexagon socket bolt is widely used, ranging from a small electronic product and mechanical equipment to automobiles, airplanes, ships, etc., which need to move to high-strength hexagon bolts. In addition, the high-strength hexagon bolt is applied to the following industries: electronic industry, electrical industry, electrical industry, power industry, [...]

By |June 13th, 2020|A307, A325, A490, ASTM International Standard, Bolt Types, Heavy Hex Bolts, Hex Bolts, Hexagon Bolt, High Strength Bolts, High Strength Structure Bolts|Comments Off on Material and Performance of High Strength Hexagon Socket Bolt

Drawing of Thread Hole of Heavy Hex Bolt

When drawing the Thread Hole of Heavy Hex Bolt, use two thick solid lines, close the end with a triangle (also thick solid line), then offset two thin solid lines (offset distance is thread depth) outwards, and close the front of the triangle with a thin solid line. In addition, the following three points should [...]

By |June 11th, 2020|A325, A490, ASTM International Standard, Bolt Types, Heavy Hex Bolts, Hex Bolts, Hexagon Bolt|Comments Off on Drawing of Thread Hole of Heavy Hex Bolt

Advantages of Hot Dip Galvanized Hexagon Bolt

In the work, we can often see the hot dip galvanized hexagon bolt, because it has many advantages, making it popular with customers, and rapid development in the market. Generally speaking, the top surface of the head of the hot-dip galvanized hexagon bolt is marked with convex or concave characters, or the side of the [...]

By |June 10th, 2020|A325, A490, ASTM International Standard, Bolt Types, Heavy Hex Bolts, Hex Bolts, High Strength Bolts, High Strength Structure Bolts|Comments Off on Advantages of Hot Dip Galvanized Hexagon Bolt
  • ASTM A325

ASTM A325

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 1 1⁄2 inches (13 to 38 mm) in diameter. The equivalent metric standard is ASTM A325M, which is [...]