Thread Processing Technology of High Strength Bolt

The thread of high strength bolt is realized by receiving hot working method. The thread material within the diameter range is processed through the process of thread rolling plate, and the screw thread of high strength bolts is formed by the pressure of screw plate. If the plastic flow line of the thread part is [...]

By |September 8th, 2020|A325, A490, ASTM International Standard, Bolt Types, High Strength Bolts, High Strength Structure Bolts|Comments Off on Thread Processing Technology of High Strength Bolt

Heat Treatment of American Hexagon Socket Bolts

There are 10 kinds of heat treatment methods for American hexagon socket bolts 1. Normalizing: the steel or steel parts are heated to the appropriate temperature above the critical point AC3 or ACM for a certain time and then cooled in air to obtain pearlite structure. 2. Annealing: the hypoeutectoid steel workpiece is heated to [...]

By |August 20th, 2020|A325, A490, ASTM International Standard, Bolt Types, Heavy Hex Bolts, Hex Bolts, Hexagon Bolt, Socket Head Bolts|Comments Off on Heat Treatment of American Hexagon Socket Bolts

A325M Heavy Duty Hexagon Bolt Specification

Heavy duty hexagon bolt: 1. Standard: A325M 2. Grade: 4.8 / 5.8 / 6.8 / 8.8 / 10.9 / 12.9 ,  grade 2 / 5 / 8 3. Specification: m6-m24, 1 / 4 inch-1 inch 4. Length: 10mm-270mm,  1 / 2 inch-10 inches 5. Surface treatment: natural color, blackening, galvanizing, hot galvanizing, Dacromet 6. Packing: [...]

By |August 13th, 2020|A325, ASTM International Standard, Bolt Types, Bolts & Nuts Grade, Fastener, Grade 8.8, Heavy Hex Bolts|Comments Off on A325M Heavy Duty Hexagon Bolt Specification

Construction of High Strength Bolts

The following problems should be paid attention to in the construction of high strength bolts: (1) Surface rust, oil stain, burr and weld bead on bolt hole wall shall be cleaned. (2) After treatment, the contact friction surface shall meet the requirements of anti scratch coefficient. The high-strength bolts used shall be matched with nuts [...]

By |July 23rd, 2020|A325, A490, ASTM International Standard, Bolt Types, Heavy Hex Bolts, High Strength Bolts, High Strength Structure Bolts|Comments Off on Construction of High Strength Bolts

Dacromet Bolt Coating Featurers

Dacromet bolt coating- apply coating (colored coating, Dacromet) on the workpiece as required, with appearance of silver, black or color, and salt spray test for more than 240 hours. Dacromet: the appearance of Dacromet coating is uniform silver gray. The coating contains 80% thin zinc sheet and aluminum sheet, and the rest is chromate. It [...]

By |July 18th, 2020|A325, ASTM International Standard, Bolt Types, Countersunk Bolt, F3125, F568M, Hex Bolts, Hexagon Bolt, Socket Head Bolts, Stud Bolt|Comments Off on Dacromet Bolt Coating Featurers

High Strength Wind Power Bolt

As one of the most widely used connection methods in wind power equipment, high-strength wind power bolt and nut connection has the advantages of simple construction, disassembly and replacement, good stress and fatigue resistance. The domestic high strength bolt connection construction method generally adopts the torque method. At present, most of the domestic mainstream wind [...]

By |July 12th, 2020|A325, A490, ASTM International Standard, Bolt Types, Heavy Hex Bolts, High Strength Bolts, High Strength Structure Bolts|Comments Off on High Strength Wind Power Bolt

Application of Hexagon Head Bolt

The installation and use of hexagon head bolts are directly related to the quality and service life of fasteners, and the safety of bolts is the primary consideration. The main factors affecting the hexagon head bolt: the selection of material, thickness of steel plate, processing and cutting, surface coating and installation of steel structure shall [...]

By |June 29th, 2020|A325, A563, ASTM International Standard, Construction Bolts & Nuts, Heavy Hex Bolts, Hex Bolts, Hexagon Bolt, High Strength Structure Bolts, Structural Bolts|Comments Off on Application of Hexagon Head Bolt

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 [...]

  • ASTM A325 Specifications

ASTM A325 Specifications

ASTM A325 Specifications Prior to its withdrawl in 2016, the ASTM A325 specifications 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. Refer to the Structural Bolts page of our site for [...]

By |October 10th, 2019|A325, A563, ASTM International Standard, F3125|Comments Off on ASTM A325 Specifications