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ASTM A490M Heavy Hex Bolts

ASTM A490M Heavy Hex Bolts – Quenched and tempered alloy steel heavy hex structural bolts per ASTM A490M (now consolidated under ASTM F3125/F3125M Grade A490M), Classes 10.9 and 10.9.3. Metric sizes M12–M36. Minimum tensile strength 1,040–1,210 MPa, core hardness 33–38 HRC. Types: Type 1 (medium carbon alloy steel) and Type 3 (weathering steel for atmospheric corrosion resistance). Thread tolerance 6g per ASME B1.13M. Supplied as assembly with ASTM A563M Class 10S heavy hex nut and ASTM F436M hardened washer. Magnetic particle inspection required for longitudinal discontinuities and transverse cracks. Hot-dip galvanizing and mechanical zinc coating prohibited due to hydrogen embrittlement risk; zinc-aluminum coatings per ASTM F1136/F2833/F3019 permitted. Applications: high-strength steel-to-steel structural connections in bridges, buildings, towers, and industrial structures per RCSC Specification.

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Product Details

ASTM A490M Heavy Hex Structural Bolts | Metric, Quenched & Tempered Alloy Steel

Product Introduction
Metric heavy hex structural bolts manufactured to ASTM F3125/F3125M, Grade A490M, the consolidated standard that replaced ASTM A490M in 2016. Quenched and tempered alloy steel. Available in Type 1 (medium carbon alloy steel) and Type 3 (weathering steel). Sizes M12 to M36 inclusive. Intended for structural connections per the RCSC Specification for Structural Joints Using High-Strength Bolts. Used in bridges, heavy steel buildings, and critical infrastructure requiring maximum joint strength.

Material & Mechanical Properties

Tensile strength: 1040–1210 MPa
Minimum yield strength: 940 MPa
Minimum elongation: 14% in 4D
Minimum reduction of area: 40%
Heat treatment: oil quenched from austenitizing temperature; tempered at minimum 427 °C
Type 1 heat analysis: carbon 0.30–0.48% through M30; 0.35–0.53% for M36
Type 3: weathering steel per Composition A, B, or corrosion index of 6 or greater
Hardness: Rockwell C 33–39 for standard lengths; maximum 39 HRC for longer bolts

Mechanical properties are certified by lot. Material Test Reports are available.

Geometry & Thread
Dimensions conform to ASME B18.2.6M for metric heavy hex structural bolts. Diameters: M12, M16, M20, M22, M24, M27, M30, M36. ISO metric coarse pitch per ISO 261. Width across flats: M16 = 27 mm; M20 = 34 mm; M24 = 41 mm; M30 = 50 mm.

Surface Finish & Coating Limitations
Hot-dip galvanizing is not permitted. The molten zinc bath exceeds the tempering temperature and introduces hydrogen embrittlement risk. Permitted coatings include zinc/aluminum systems applied per ASTM F1136, F2833, or F3393. Type 3 weathering steel is normally supplied bare to develop a protective oxide patina.

Assembly, Marking & Certification
Complete assembly:

Bolt: ASTM F3125 Grade A490M heavy hex
Nut: ASTM A194M Grade 2H or A563M Grade DH heavy hex
Washer: ASTM F436M hardened

Head marking: “A490M”, manufacturer’s identification mark, and type designation. Type 3 carries an underlined “A490M”. Full traceability is maintained through lot control linked to Material Test Reports. EN 10204 Type 3.1 inspection certificates are available. Rotational-capacity tests are performed on all bolt, nut, and washer assemblies prior to shipment.

Application Suitability
Bridges, heavy steel buildings, and critical infrastructure designed to the RCSC Specification. Specified where higher strength than Grade A325M is required. Type 3 weathering steel is used for unpainted atmospheric exposure where the protective patina is acceptable. Hot-dip galvanizing is not an option for this grade.

ASTM A490M Heavy Hex Structural Bolts | Metric, Quenched & Tempered Alloy Steel

Material & Mechanical Properties

Tensile strength: 1040–1210 MPa
Minimum yield strength: 940 MPa
Minimum elongation: 14% in 4D
Minimum reduction of area: 40%
Heat treatment: oil quenched from austenitizing temperature; tempered at minimum 427 °C
Type 1 heat analysis: carbon 0.30–0.48% through M30; 0.35–0.53% for M36
Type 3: weathering steel per Composition A, B, or corrosion index of 6 or greater
Hardness: Rockwell C 33–39 for standard lengths; maximum 39 HRC for longer bolts

Mechanical properties are certified by lot. Material Test Reports are available.

Assembly, Marking & Certification
Complete assembly:

Bolt: ASTM F3125 Grade A490M heavy hex
Nut: ASTM A194M Grade 2H or A563M Grade DH heavy hex
Washer: ASTM F436M hardened

FAQ

1. How do you let me trust you.

Jiaxing City Qunbang Hardware Co.,ltd hs its own right of import and export,QBH trademark in China,United States,European Union have been registered.At the same time,you can also check the registration information of our company in the China industry and Commerce system.

2. How about your price.

We will be based on different markets,for different quality and quantity,tailor-made prices for customers,in order to achieve win-win goal.

3. How do you control your quality.

Incoming quality contral( IQC)→Process Quality control(PQC)→Output quality control(OQC),and the random samples is sent to TUV for testing.If the customer received the goods and found quality problems,QBH company promises to be responsible for returning money or replenishing the goods

4. Could you provide free samples?

For new customer, We can provide free samples for standard fastener, But the clients will pay the express

charges. For old customer, We will send you free samples and pay express charges by ourself.

5. What is your packing.

Usually 25KG/carbon,36CTNS on the pallets,or 20-30kg/Bags,then on the pallet,QBH company personalized packagingis also available,like 10PCS/plastic bag or 10pcs/box,it can print some information

such as LOGO and pattern of customers.

6. What is your payment term

Normally,our terms of payment are TT and L/C,if we cooperate for a long time,we can reach the point of mutual trust,and fully support our customers to become bigger and stronger in the local market.Not only in the price concessions,but also in the payment can also be made on credit,Specific credit sales time needs to be negotiated separately.

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