Cold heading Service

A490 American Standard Heavy Hex Bolts Manufacturer in China

Ningbo Teng Qi Fasteners Co., Ltd is a leading A490 American Standard heavy hex bolts manufacturer in China. The A490 heavy hex bolt is a type of high-strength structural bolt made from alloy steel. It’s commonly used in heavy construction and structural applications where strong connections are required. A490 bolts are designed to provide a secure and reliable connection in projects such as bridges, buildings, and other critical structures. These bolts have specific mechanical and dimensional requirements outlined in the ASTM A490 standard, ensuring their suitability for demanding and high-load environments.

The ASTM A490 specification covered quenched and tempered, alloy steel, heavy hex structural bolts from 1/2″ diameter through 1-1/2″ diameter with a minimum 150 ksi tensile. For bolts with different thread lengths than specified for structural bolts but with similar mechanical properties, see Specification A354 grade BD. ASTM A490 bolts are typically not recommended for hot dip galvanizing due to the potential for hydrogen embrittlement, which can reduce the mechanical properties of the bolts. Instead, other methods of corrosion protection, such as mechanical zinc plating or other suitable coatings, are often used for A490 bolts to maintain their high-strength properties.

A490 High Strength Heavy Hex Bolts Black Oxidation for steel structural
Grade A490 Heavy Hex Bolts Dacromet

Specification of A490 American Standard Heavy Hex Bolts:

Product nameASTM A490 Heavy Hex Bolts
Diameter1/2″ – 1-1/2″
LengthUp to 6″ – 10″ maximum (depending on diameter)
Head TypeHeavy Hex Head
StrengthAccording F3125 standard
Compatible nuts/washersA563 dh heavy hex nuts and F436 Washer
Manufacturing Processwire drawing, cold heading/hot forging, thread rolling, heat treatment, surface treatment
Surface treatmentBlack Oxide Coating/Zinc Plating (Electroplating)/Hot-Dip Galvanizing/Mechanical Galvanizing/Dacromet Coating/Painting or Powder Coating
Application IndustryConstruction/Bridges/Industrial Structures/Marine Structures/Infrastructure

Chemical Composition:

ElementSizes 1/2 to 1-3/8Size 1-1/2
Carbon, max0.30 - 0.48%0.35 - 0.53%
Phosphorus, max0.040%0.040%
Sulfur, max0.040%0.040%

Mechanical Property:

SizeTensile, ksiYield, ksiElong. %, minRA %, min
1/2 - 1-1/2150-1731301440

FAQ about A490 heavy hex bolts manufacturer:

1.What’s the price of type1 of A490 heavy hex bolts?

In general, our A490 bolt are made of 42crmo alloy steel. The price is made up of materials, processing, packaging and labor costs. We are focused on the production of bolts factory. Committed to making our customers profitable. The wholesale price of A490 heavy hex bolts is 1600-2200usd/ton. The material price of steel will fluctuate frequently, and the price is different for different surface treatment/quantity, so please send the inquiry to our email for the specific price. Emai:

2.How many days does it take you to produce a container of bolts?

Our daily production capacity of cold heading and hot forging bolts is about 30 tons, but due to the arrangement of materials, heat treatment, surface treatment, order scheduling takes time. The average delivery time of bolts for a container is 30-40 days.

3.What countries do you export your bolts to? Whether mechanical properties can be guaranteed.

We have stable customers in the United States, Germany, Russia, Poland, Spain, Brazil, Argentina, Vietnam, Canada, Australia, UAE, Saudi Arabia and other countries for more than 10 years. Our bolts are guaranteed to meet F3125 mechanical performance requirements.

4.Can you provide samples of A490 heavy hex bolt?

Yes, we have some samples in regular sizes. Samples can be provided free of charge. But the customer needs to bear the freight.

5. Do you have a minimum order quantity requirement?

Yes, the MOQ we usually produce is about one ton.