High Strength ASTM Structural Bolts A325 Bolts

Short Description:

High strength ASTM bolts including A325, A490, A307, F1554 and A193 B7. Certified structural and anchor bolts for steel buildings, bridges and infrastructure projects. Factory direct ASTM bolt supplier with global export service.

Standard: ASTM A325

Bolt Type: Heavy Hex Structural Bolt

Material: Medium Carbon Steel

Diameter Range: 1/2” – 1-1/2” (M12 – M36 equivalent)

Length: 1” – 12” (Custom Length Available)

Thread Type: UNC (Unified Coarse Thread)

Head Marking: A325 Identification Mark

Certification: ISO 9001

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Product Detail

Product Tags

PRODUCT DETAIL

Item	Specification
Standard	ASTM A325
Bolt Type	Heavy Hex Structural Bolt
Material	Medium Carbon Steel
Diameter Range	1/2” – 1-1/2” (M12 – M36 equivalent)
Length	1” – 12” (Custom Length Available)
Thread Type	UNC (Unified Coarse Thread)
Head Marking	A325 Identification Mark
Finish Options	Black / Hot-Dip Galvanized (HDG)
Heat Treatment	Quenched & Tempered
Certification	Mill Test Certificate (MTC)

Mechanical Properties (Typical)

Property	Requirement
Tensile Strength	≥ 830 MPa (120 ksi)
Yield Strength	≥ 660 MPa (92 ksi)
Hardness	24–35 HRC
Proof Load	As per ASTM A325 Standard

ASTM A325 Heavy Hex Bolt – Dimensional Table (Inch Series)

Nominal Diameter	Thread (UNC)	Across Flats (Heavy Hex)	Head Height	Thread Length*	Available Length Range
1/2”	13 TPI	7/8”	11/32”	1-1/4”	1” – 8”
5/8”	11 TPI	1-1/16”	27/64”	1-1/2”	1-1/2” – 10”
3/4”	10 TPI	1-1/4”	33/64”	1-3/4”	2” – 12”
7/8”	9 TPI	1-7/16”	19/32”	2”	2” – 14”
1”	8 TPI	1-5/8”	21/32”	2-1/4”	2-1/2” – 16”
1-1/8”	7 TPI	1-13/16”	3/4”	2-1/2”	3” – 18”
1-1/4”	7 TPI	2”	27/32”	2-3/4”	3” – 20”
1-3/8”	6 TPI	2-3/16”	7/8”	3”	4” – 20”
1-1/2”	6 TPI	2-3/8”	15/16”	3-1/4”	4” – 24”

Metric Equivalent (Project Reference Only)

Approx. Inch Size	Metric Equivalent
1/2”	M12
5/8”	M16
3/4”	M20
7/8”	M22
1”	M24
1-1/4”	M30
1-1/2”	M36

*Thread length based on standard structural bolt practice. Full thread or special thread length available upon request.

Recommended Installation Torque (Plain Finish)

Nominal Diameter	Proof Load (kN)	Min. Bolt Tension (kN)	Approx. Torque (N·m)	Approx. Torque (ft-lb)
1/2”	91	68	110	80
5/8”	144	108	215	160
3/4”	213	160	380	280
7/8”	295	221	610	450
1”	394	295	920	680
1-1/8”	510	382	1,300	960
1-1/4”	642	481	1,840	1,360
1-3/8”	790	593	2,450	1,810
1-1/2”	954	716	3,200	2,360

Values are approximate and may vary depending on lubrication, surface condition, and installation method.

APPLICATION

Structural Steel Buildings: Beam-to-column connections, bracing systems, steel frame assembly.

Bridge Engineering: Girder connections, truss joints, structural reinforcements.

Industrial Plants & Energy Facilities: Steel frames, equipment supports, wind tower flanges.

Infrastructure & Public Projects: Stadiums, transportation hubs, municipal steel structures.

Why Choose Our ASTM Bolts?

ASTM certified production
Strict quality inspection
Custom sizes & coatings available (HDG, black, zinc plated)
Fast global shipping
Factory direct price

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PACKAGING AND SHIPPING

Packaging:

We use waterproof plastic film-lined cartons or wooden boxes for packaging. Custom packaging is also available.

Shipping:

Select the appropriate shipping method based on the number and weight of the support trays, such as flatbed trucks, containers, or ships. Consider factors such as distance, time, cost, and shipping regulations.

Production and warehousing situation

Founded in 2012, Royal Group is a high-tech enterprise specializing in the research, development, production, and sales of construction products. Headquartered in Tianjin, a central city in China and one of the first coastal cities to open up to the outside world, we have branches nationwide.

Our company offers a wide variety of fastener products to meet the needs of various industries and applications. Whether you need screws, bolts, nuts, washers, or any other type of fastener, we have what you need. Please contact our experts.

We have over a decade of experience in bolts, nuts, and other solid parts. We can provide products in various standards, including DIN, JIS, and ANSI, and can customize fasteners based on drawings and samples. Our products are sold in over 100 countries worldwide.