A325 Heavy Hex Bolt W/Nut, Galvanized US/CA

ASTM F3125 Grade A325 heavy hex bolts with nuts are high strength structural bolts manufactured from medium carbon steel, carbon boron, or medium carbon alloy steel. Fasteners listed below are melted and manufactured in the USA or Canada. A325 hex bolts are available in diameters from 1/2" through 1 1/2" inclusive. Dimensional specifications are governed by ASME B18.2.6. Grade markings consists of both the grade symbol "A325" and the manufacturer's identification mark. Inch series fasteners meeting ASTM F3125 Grade A325 specifications are intended for use in steel to steel structural connections. Grade A325 heavy hex bolts offer a heavy pattern head to increase the bearing surface and distribute the clamping load over a larger area. Available in hot dip galvanized finish, which provides a corrosion resistant zinc coating. One hot dip galvanized dyed & waxed A563 Grade DH heavy hex nut supplied per bolt, unassembled.

Products
Governing Standards
Mechanical Properties
Chemical Properties
Dimensional Specifications
Mechanical & Chemical Properties Tables

Governing Standards

Governing StandardsA325 w/DH Nut

A325 Bolt
ASTM F3125	Covers the mechanical and material requirements for inch series fasteners used in automotive and related industries in diameters through 1-1/2″.
ASME B18.2.6	Covers the general and dimensional data for five products in the inch series recognized as American National Standard. These five structural products include: (a) Heavy Hex Structural Bolts: ASTM A325 or ASTM A490; (b) Heavy Hex Nuts: ASTM A 563; (c) Hardened Steel Washers; Circular, Circular Clipped or Beveled: ASTM F436; (d) Compressible Washer-Type Direct Tension Indicators: ASTM F959; (e) Twist-Off-Type Tension Control Structural Bolts: Heavy Hex and Round: ASTM F1852.
ASME B1.1 UNC & UNF Class 2A	Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

SC	Slip Critical Connection
N	Bearing type connection with threads in the shear plane.
X	Bearing type connection with no threads in the shear plane.

DH Nut
ASTM A563	Covers the chemical and mechanical requirements for eight grades of carbon and alloy steel nuts for general structural and mechanical uses on bolts, studs, and other externally threaded parts.
ASME B18.2.2	Covers the complete general and dimensional data for the various types of inch series square and hex nuts, including machine screw nuts and coupling nuts.
ASME B1.1 UNC & UNF Class 2B	Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

A325 Head Markings
A325 Material Marking

Grade 5 Head Marking
DH Material Marking

Mechanical Properties

Mechanical PropertiesA325 w/DH Nut

A325 Bolt: Alloy Steel, Quenched & Tempered			Per ASTM F3125/F3125M-15a
Grade A325	Tensile Strength	Yield Strength	Elongation in 4D	Reduction in Area
Grade A325	Min psi	Min psi	Min %	Min %
Inch 120 ksi	120,000	92,000	14	35

DH Nut: Carbon & Alloy Steel		Per ASTM A563-2015
Diameter	Proof Load Stress		Core Hardness
	ksi (1)		Rockwell
	Non-Zinc- Coated (2)	Zinc- Coated (2)	Min	Max
1/4" thru 4" (3)	175	150	C24	C38

1. To determine nut proof load in pounds, multiply the appropriate nut proof load stress by the tensile stress area of the thread.
2. Non-zinc-coated nuts are nuts intended for use with externally threaded fasteners which have a plain (nonplated or noncoated) finish or have a plating or coating of insufficient thickness to necessitate overtapping the nut thread to provide assemblability. Zinc-coated nuts are nuts intended for use with externally threaded fasteners which are hot-dip zinc-coated, mechanically zinc-coated, or have a plating or coating of sufficient thickness to necessitate overtapping the nut thread to provide assemblability.
3. Nuts made in accordance with the requirements of Specification A194/A194M, Grade 2H, and marked with its grade symbol are an acceptable equivalent for Grade DH nuts. When A194 zinc-coated inch series nuts are supplied, the zinc coating, overtapping, lubrication and rotational capacity testing shall be in accordance with Specification A563.

Dimensional Specifications

Dimensional SpecificationsA325 w/DH Nut

A325 Bolt		Per ASME B18.2.6-2010
Nominal Diameter		UNC	UNF	E		F			G		H			LT	Y
				Body Diameter		Width Across Flats			Width Across Corners		Head Height			Thread Length	Transition Length
				Max	Min	Basic	Max	Min	Max	Min	Basic	Max	Min	Ref	Max
1/2	0.500	13	20	0.515	0.482	7/8	0.875	0.850	1.010	0.969	11/32	0.364	0.302	1.000	0.190
5/8	0.625	11	18	0.642	0.605	1 1/16	1.062	1.031	1.227	1.175	27/64	0.444	0.378	1.250	0.220
3/4	0.750	10	16	0.768	0.729	1 1/4	1.250	1.212	1.443	1.383	1/2	0.524	0.455	1.380	0.250
7/8	0.875	9	14	0.895	0.852	1 7/16	1.438	1.394	1.660	1.589	37/64	0.604	0.531	1.500	0.280
1	1.000	8	14	1.022	0.976	1 5/8	1.625	1.575	1.876	1.796	43/64	0.700	0.591	1.750	0.310
1 1/8	1.125	7	12	1.149	1.098	1 13/16	1.812	1.756	2.093	2.002	3/4	0.780	0.658	2.000	0.340
1 1/4	1.250	7	12	1.277	1.223	2	2.000	1.938	2.309	2.209	27/32	0.876	0.749	2.000	0.380
1 3/8	1.375	6	12	1.404	1.345	2 3/16	2.188	2.119	2.526	2.416	29/32	0.940	0.810	2.250	0.440
1 1/2	1.500	6	12	1.531	1.470	2 3/8	2.375	2.300	2.742	2.622	1	1.036	0.902	2.250	0.440

All dimensions are in inches.

DH Nut		Per ASME B18.2.2-2015
Nominal Diameter		UNC	UNF	UN8	Width Across Flats			Width Across Corners		Thickness
Nominal Diameter		UNC	UNF	UN8	Basic	Max	Min	Max	Min	Basic	Max	Min
1/4	0.250	20	28		1/2	0.500	0.488	0.577	0.556	15/64	0.250	0.218
5/16	0.313	18	24		9/16	0.562	0.546	0.650	0.220	19/64	0.314	0.280
3/8	0.375	16	24		11/16	0.688	0.669	0.794	0.763	23/64	0.377	0.341
7/16	0.438	14	20		3/4	0.750	0.728	0.866	0.830	27/64	0.441	0.403
1/2	0.500	13	20		7/8	0.875	0.850	1.010	0.990	31/64	0.504	0.464
9/16	0.563	12	18		15/16	0.938	0.909	1.083	1.037	35/64	0.568	0.526
5/8	0.625	11	18		1 1/16	1.062	1.031	1.227	1.175	39/64	0.631	0.587
3/4	0.750	10	16		1 1/4	0.250	1.212	1.443	1.382	47/64	0.758	0.710
7/8	0.875	9	14		1 7/16	1.438	1.394	1.660	1.589	55/64	0.885	0.833
1	1.000	8	14		1 5/8	1.625	1.575	1.876	1.796	63/64	1.012	0.956
1 1/8	1.125	7	12	8	1 13/16	1.812	1.756	2.093	2.002	1 7/64	1.139	1.079
1 1/4	1.250	7	12	8	2	2.000	1.380	2.309	2.209	1 7/32	1.251	1.187
1 3/8	1.375	6	12	8	2 3/16	2.188	2.119	2.526	2.416	1 11/32	1.378	1.310
1 1/2	1.500	6	12	8	2 3/8	2.375	2.300	2.742	2.622	1 15/32	1.505	1.433
1 5/8	1.625	5 1/2	12	8	2 9/16	2.562	2.481	2.959	2.828	1 19/32	1.632	1.556
1 3/4	1.750	5	12	8	2 3/4	2.750	2.662	3.175	3.035	1 23/32	1.759	1.679
1 7/8	1.875	5	12	8	2 15/16	2.938	2.844	3.392	3.242	1 27/32	1.886	1.802
2	2.000	4 1/2	12	8	3 1/8	3.125	3.025	3.608	3.449	1 31/32	2.013	1.925
2 1/4	2.250	4 1/2	12	8	3 1/2	3.500	3.388	4.041	3.862	2 13/64	2.251	2.155
2 1/2	2.500	4	12	8	3 7/8	3.875	3.750	4.474	4.275	2 29/64	2.505	2.401
2 3/4	2.750	4	12	8	4 1/4	4.250	4.112	4.907	4.688	2 45/64	2.759	2.647
3	3.000	4	12	8	4 5/8	4.625	4.475	5.340	5.102	2 61/64	3.013	2.893
3 1/4	3.250	4	12	8	5	5.000	4.838	5.774	5.515	3 3/16	3.252	3.124
3 1/2	3.500	4	12	8	5 3/8	5.375	5.200	6.207	5.928	3 7/16	3.506	3.370
3 3/4	3.750	4	12	8	5 3/4	5.750	5.562	5.562	6.341	3 11/16	3.670	3.616
4	4.000	4	12	8	6 1/8	6.125	5.925	5.925	6.755	3 15/16	4.014	3.862

All dimensions are in inches.

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A325 Bolt		Per ASTM F3125/F3125M-15a
Grade	Material	Carbon	Manganese	Phosphorus	Sulfur	Silicon	Boron
Grade	Material	% by weight	% by weight	% by weight	% by weight	% by weight	% by weight
A325 Type 1	Carbon or Alloy Steel with or without Boron	0.30-0.52	0.60 min	0.035 max	0.040 max	0.15-0.30	0.003 max

DH Nut		Per ASTM A563-2015
Grade	Material	Carbon	Manganese	Phosphorus	Sulfur
Grade	Material	% by weight	% by weight	% by weight	% by weight
DH (1)	Carbon & Alloy Steel	0.20-0.55	0.60	0.04	0.05

A325 Heavy Hex Bolt W/Nut, Galvanized US/CA

Technical Data

Governing Standards

Governing StandardsA325 w/DH Nut

Mechanical Properties

Mechanical PropertiesA325 w/DH Nut

Chemical Properties

Chemical PropertiesA325 w/DH Nut

Dimensional Specifications

Dimensional SpecificationsA325 w/DH Nut

Mechanical & Chemical Properties Tables

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