ASTM A325 Standard Heavy Hex Structure Bolts

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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 Treatment: Black Oxide, Galvanized, Ruspert, Dacromet
Trademark: TS
Shipping Package: Small Box, Bag, Polybag, DIY Box, Carton, Pallet
Standards: DIN, BS, JIS, ANSI
Origin: Zhejiang, China
HS Code: 731815
ASTM A325 Heavy Hex Structure Bolt
Available in Black Oxide finish, these heavy hex bolts are ideal for structural applications.
High tensile strength, suitable for Class 8.8 and higher grades.
Available in DIN metric sizes from M12x25 up to M36x300.
Also available in Inch sizes (SAE Grade 8) from 7/16x1 up to 1.1/2x5 inches.
Complies with SAE, ASTM, DIN, JIS, and other international standards.



Transhow Fasteners specializes in manufacturing a wide range of bolts, including hex bolts, round head bolts, square head bolts, T-head bolts, dog head bolts, and custom-designed fasteners.
We produce both metric and inch standard bolts, following standards like DIN, EN, ISO, GB, JIS, AS, UNI, and others.
Made from carbon steel, alloy steel, stainless steel, or brass, our bolts are tailored for different applications.
Bolts below M24 (or 1 inch) are typically cold-forged, while larger sizes are hot-forged.
Additional surface treatments such as black oxide, zinc plating, galvanizing, Dacromet, and chrome plating are available to enhance corrosion resistance and durability.
Contact us today for high-quality fasteners that meet your specific needs!



Heavy Hex Bolts & High Strength Bolts
These high-strength heavy hex structure bolts are widely used in steel-to-steel connections for buildings, highways, railways, and bridges. They are often paired with heavy hex nuts.
Material options include medium carbon steel and alloy steel, with finishes like black oxide or hot-dip galvanized.
Our standard products include:
- 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
- EN 14399 Hexagon head bolts for steel structures
- ASTM A193, A194, A307, A320, A325, A354, A490 heavy hex bolts and structure bolts
- BS 1769 Hexagon nuts, Heavy style; 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 Aluminum
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 Gr 8.2
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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