ASTM A325 Standard Heavy Hex Structure Bolts

July 16, 2025

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Model NO.: 7/16x3 inch
Finish: Color-Zinc Plated
Color: Yellow
Quality: Class 8.8
Specifications: DIN / ISO / ANSI
ASTM Grade: A325
Surface: Black Oxide, Galvanized, Ruspert, Dacromet
Trademark: TS
Transport Package: Small Box, Bag, Polybag, DIY Box, Carton, Pallet
Specification: DIN, BS, JIS, ANSI
Origin: Zhejiang, China
HS Code: 731815
ASTM A325 Heavy Hex Structural Bolt
Black Oxide, High-Strength Hex Bolt
High tensile bolt, high strength bolt
DIN metric size grade 10.9 and 12.9
M12x25 up to M36x300
ANSI B18.5 Inch Size SAE Grade 8
Size 7/16x1 up to 1.1/2x5 inch
Optional mechanical features comply with
SAE, ASTM, DIN, JIS, etc.


Transhow Fasteners is a professional manufacturer of various types of bolts, including hex bolts, round head bolts, square head bolts, T-head bolts, dog head bolts, and other customized fasteners. We supply both metric and inch standard bolts, meeting international standards such as DIN, EN, ISO, GB, JIS, AS, UNI, and also ASME/ANSI, ASTM/SAE/IFI, BS, etc. Our bolts are made from materials like carbon steel, alloy steel, stainless steel, and brass. Bolts below M24 (or 1 inch) are typically cold forged, while larger sizes are hot forged. To meet different corrosion resistance and strength requirements, we offer additional treatments such as black oxide, zinc plating, galvanizing, dacomate, nickel plating, chrome plating, and more. If you need high-quality structural bolts, feel free to contact us today!


Heavy Hex Bolts & Structural Bolts – High Strength Fasteners
High-strength heavy hex structure bolts are widely used in steel-to-steel connections for buildings, highways, railways, and bridges. These bolts are usually paired with heavy hex nuts. The material used for these bolts and nuts is generally medium carbon steel or alloy steel, and they are commonly finished with black oxide or hot-dipped galvanizing. Here are some of our standard products:
DIN 6914 – High-strength hexagon head bolts with large widths across flats for structural steel bolting
DIN 7990 – Steel hexagon head bolts for structural steel bolting with hexagon nuts
ISO 7411/7412 – Hexagon bolts for high-strength structural bolting with large width across flats
EN 14399 – Hexagon head bolts for steel structures
ASTM A193, A194, A307, A320, A325, A354, A490 – Heavy hex bolts and structural bolts
BS 1769 – Heavy-style hexagon nuts, BS 4395 – High-strength bolts with large hexagon heads
Bolt Head Hex Round Mushroom T Square Oval CSK
Material Carbon Steel Stainless Steel Alloy Steel Brass Copper Bronze Aluminium
Grade/Metric 4.8 6.8 8.8 10.9 12.9
Grade/ANSI A307-A A307-B A307-C J429 Gr 2 J429 Gr 5 J429 Gr 8 J429 Gr8.2
Standards DIN ISO GB ANSI JIS BS UNI
Threads UNC UNF 2A 3A T threads Left Thread ISO
Steel Grade C1035 C1045 C1020 C1010 Q235 A3 Q195
Surface Plain Black Zinc YZP Dacromet Ruspert Nickle
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