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ASTM F3125 Grade A325M Heavy Hex Structural Bolt, Steel, Type 1, M12 to M36
ASTM F3125 Grade A325M Type 1 heavy hex structural bolt – quenched and tempered medium carbon steel heavy hex head bolt manufactured to ASTM F3125/F3125M, the consolidated specification replacing ASTM A325M. Metric sizes M12–M36 inclusive. Minimum tensile strength 830 MPa, minimum yield strength 660 MPa. Minimum elongation 14%, reduction of area 35%. Thread per ASME B1.13M, Class 6g. Supplied as assembly with ASTM A563M heavy hex nut (property class 10S for Type 1) and ASTM F436M hardened washer. Head marked with three radial lines, “A325M,” and manufacturer identification. Finishes: plain (uncoated) or hot-dip galvanized per ASTM F2329 / mechanically deposited zinc per ASTM B695. Intended for structural connections per RCSC Specification for Structural Joints Using High-Strength Bolts. Applications: steel-to-steel structural connections in buildings, bridges, towers, and industrial structures requiring 830 MPa minimum tensile strength
ASTM F3125 Grade A325M Type 1 heavy hex structural bolt – quenched and tempered medium carbon steel heavy hex head bolt manufactured to ASTM F3125/F3125M, the consolidated specification replacing ASTM A325M. Metric sizes M12–M36 inclusive. Minimum tensile strength 830 MPa, minimum yield strength 660 MPa. Minimum elongation 14%, reduction of area 35%. Thread per ASME B1.13M, Class 6g. Supplied as assembly with ASTM A563M heavy hex nut (property class 10S for Type 1) and ASTM F436M hardened washer. Head marked with three radial lines, “A325M,” and manufacturer identification. Finishes: plain (uncoated) or hot-dip galvanized per ASTM F2329 / mechanically deposited zinc per ASTM B695. Intended for structural connections per RCSC Specification for Structural Joints Using High-Strength Bolts. Applications: steel-to-steel structural connections in buildings, bridges, towers, and industrial structures requiring 830 MPa minimum tensile strength
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Product Details
ASTM F3125 Grade A325M Heavy Hex Structural Bolts | Metric, Type 1
Product Introduction
Metric heavy hex structural bolts manufactured to ASTM F3125/F3125M, Grade A325M, Type 1, Heavy Hex style. F3125 consolidates and replaces six former ASTM structural bolting standards, including A325 and A325M. Sizes M12 to M36 inclusive. Type 1 denotes medium-carbon steel, carbon boron steel, medium carbon alloy steel, or alloy boron steel. Intended for structural connections per the RCSC Specification for Structural Joints Using High-Strength Bolts.
Material & Mechanical Properties
Quenched and tempered. Minimum tensile strength 830 MPa; minimum yield strength 660 MPa, uniform across all diameters from M12 to M36. This uniform strength requirement is a key outcome of the F3125 consolidation. Type 3 (weathering steel) is available under the same grade; Type 2 was withdrawn in 2003. Mechanical properties are certified by lot. Mill test reports are available.
Geometry & Thread
Heavy hex head dimensions per ASTM F3125/F3125M. Sizes M12 to M36. ISO metric coarse pitch per ISO 261. The heavy hex head provides enlarged widths across flats compared to standard hex bolts, consistent with structural bolting practice. Bolts ordered with non-standard dimensions under Supplemental Requirement S2 are marked with an “S”.
Surface Finish
Plain (uncoated), hot-dip galvanized per ASTM F2329, or mechanically deposited zinc per ASTM B695. Type 3 weathering steel is typically supplied bare to develop a protective oxide patina. Coating selection considers service environment and hydrogen embrittlement control for high-strength fasteners.
Marking & Certification
Bolt head permanently marked with grade symbol “A325M” and the manufacturer’s identification mark. Type 1 bolts may optionally be marked with three radial lines 120° apart. Full traceability is maintained through lot control with each batch linked to Material Test Reports. EN 10204 Type 3.1 inspection certificates are available on request. Rotational-capacity testing is performed on all bolt, nut, and washer assemblies prior to shipping.
Assembly
Complete assembly comprises:
-
Bolt: ASTM F3125 Grade A325M heavy hex
-
Nut: ASTM A563M heavy hex
-
Washer: ASTM F436M hardened
Components may be ordered individually, packaged with nuts, packaged with nuts and washers, or as complete assemblies.
Application Suitability
Structural steel connections designed to the RCSC Specification. Used in building frames, bridges, and infrastructure where metric high-strength structural bolting is specified. Type 1 is suitable for general structural service. Type 3 is available for atmospheric corrosion resistance where specified. Installation and preload shall follow the applicable design code and RCSC provisions.
ASTM F3125 Grade A325M Heavy Hex Structural Bolts | Metric, Type 1
Product Introduction
Metric heavy hex structural bolts manufactured to ASTM F3125/F3125M, Grade A325M, Type 1, Heavy Hex style. F3125 consolidates and replaces six former ASTM structural bolting standards, including A325 and A325M. Sizes M12 to M36 inclusive. Type 1 denotes medium-carbon steel, carbon boron steel, medium carbon alloy steel, or alloy boron steel. Intended for structural connections per the RCSC Specification for Structural Joints Using High-Strength Bolts.
Material & Mechanical Properties
Quenched and tempered. Minimum tensile strength 830 MPa; minimum yield strength 660 MPa, uniform across all diameters from M12 to M36. This uniform strength requirement is a key outcome of the F3125 consolidation. Type 3 (weathering steel) is available under the same grade; Type 2 was withdrawn in 2003. Mechanical properties are certified by lot. Mill test reports are available.
Geometry & Thread
Heavy hex head dimensions per ASTM F3125/F3125M. Sizes M12 to M36. ISO metric coarse pitch per ISO 261. The heavy hex head provides enlarged widths across flats compared to standard hex bolts, consistent with structural bolting practice. Bolts ordered with non-standard dimensions under Supplemental Requirement S2 are marked with an “S”.
Surface Finish
Plain (uncoated), hot-dip galvanized per ASTM F2329, or mechanically deposited zinc per ASTM B695. Type 3 weathering steel is typically supplied bare to develop a protective oxide patina. Coating selection considers service environment and hydrogen embrittlement control for high-strength fasteners.
Marking & Certification
Bolt head permanently marked with grade symbol “A325M” and the manufacturer’s identification mark. Type 1 bolts may optionally be marked with three radial lines 120° apart. Full traceability is maintained through lot control with each batch linked to Material Test Reports. EN 10204 Type 3.1 inspection certificates are available on request. Rotational-capacity testing is performed on all bolt, nut, and washer assemblies prior to shipping.
Assembly
Complete assembly comprises:
-
Bolt: ASTM F3125 Grade A325M heavy hex
-
Nut: ASTM A563M heavy hex
-
Washer: ASTM F436M hardened
Components may be ordered individually, packaged with nuts, packaged with nuts and washers, or as complete assemblies.
Application Suitability
Structural steel connections designed to the RCSC Specification. Used in building frames, bridges, and infrastructure where metric high-strength structural bolting is specified. Type 1 is suitable for general structural service. Type 3 is available for atmospheric corrosion resistance where specified. Installation and preload shall follow the applicable design code and RCSC provisions.
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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