IFI Heavy Hex Head Metric A325M M12-M36 Steel Hex Bolt
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This specification covers two types of quenched and tempered, steel, metric heavy hex structural bolts having a minimum tensile strength of 830 MPa (Note 1).
Formerly under the jurisdiction of Committee F16 on Fasteners, this specification was withdrawn in May 2016 and replaced by Specification F3125/F3125M for High Strength Structural Bolts, Steel and Alloy Steel, Heat Treated, 120 ksi (830 MPa) and 150 ksi (1040 MPa) Minimum Tensile Strength, Inch and Metric Dimensions. Specification F3125/F3125M supersedes and replaces specifications; A325, A325M, A490, A490M, F1852 and F2280. The unified Specification F3125/F3125M corrects known inconsistencies in the original documents and the combination will assure that requirements of the products covered under the original standards stay aligned.
ASTM Standards A153/A153M Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware A563M Specification for Carbon and Alloy Steel Nuts (Metric) A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products B695 Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel D3951 Practice for Commercial Packaging F436M Specification for Hardened Steel Washers (Metric) F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, and Rivets (Metric) F788/F788M Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series F959M Specification for Compressible-Washer-Type Direct Tension Indicators for Use With Structural Fasteners (Metric) F1136M Specification for Zinc/Aluminum Corrosion Protective Coatings for Fasteners (Metric) F1470 Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection F1789 Terminology for F16 Mechanical Fasteners G101 Guide for Estimating the Atmospheric Corrosion Resistance of Low-Alloy Steels ASME Standards B 1.13M Metric Screw Threads B 18.18.3M Inspection and Quality Assurance for Special Purpose Fasteners B 18.2.3.7M Metric Heavy Hex Structural Bolts B 18.24 Part Identifying Number (PIN) Code System Standard for B18 Fastener Products
Process flow
Cold forging Annealing treatment(if need) ➨ wiredrawing ➨ clod forging ➨ thread rolling ➨make heat treatment ➨ Finish ➨ Packing
Hot forging Cutting material ➨ hot forging ➨ turning ➨ shrink diameter(half thread) ➨thread rolling ➨ make heat treatment ➨ Finish ➨ Packing
Product Grade
Grade 8S Grade 10s
Materials and Chemical compstition
1035
1045
40CR
Finish
PLAIN ZP YZP BLACK HDG DACROMET GEOMET CHROME NICKEL AND SO ON
PACKING
QBH BULK 20-25KG/CTN,36CTNS/PALLET 20-30KG/BAGS,36BAGS/PALLET ONE TON/BOXES 50KG/ IRON DRUM,12 IRON DRUMS/PALLET
QBH SMALL PACKING Packing in small boxes according to customer’s requirements Packing in plastic bag according to customer’s requirements
QBH PALLET TYPE SOLID WOOD FUMIGATION PALLET EURO Pallet THREE SPLINT PALLET WOODEN BOX
The advantages of QBH
General:
In brief Type 3 grade A325 bolts shall be marked “A325” to distinguish them from standard grade A325s. Likewise Grade A490 bolts are available in diameters from 1/2 to 1-1/2 inch diameters with a minimum tensile strength of 150,000 PSI for all diameters, and are offered in two types. In Fact 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. In accordance with ASTM A325, all threaded components of the fastener assembly must be galvanized by the same process and the supplier’s option is limited to one process per item with no mixed processes in a lot.
This Specification deals principally with two strength grades of
high-strength
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