ASTM A325 Bolts Dimensions Chart, Strength, Grade A325 Structural Bolt Sizes

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ASTM A325 Bolt Dimensions Chart, Sizes, Strength

ASTM A325 bolts are one of the most commonly used fasteners, usually used for structural steel connections in heavy steel structures. It contains two types of quenched and tempered steel heavy hex structural bolts:

  • Type 1: medium carbon, carbon boron, or medium carbon alloy steel,
  • Type 3: weathering steel.
  • Type 2: withdrawn in 1991.

The ASTM A325 standard was withdrawn in 2016 and replaced by ASTM F3125/F3125M. Except for the dimensions, the information on this page is for reference and historical purposes only.

ASTM A325 Bolts Properties & Specification

ASTM A325 material properties and specification are list in the following tables including dimensions, sizes, strength, etc.

Chemical Requirements

Chemical Requirements for Type 1 Bolts, Heat Analysis
Grades Material C Si Mn, ≤ P, ≤ S, ≤ B Alloying Elements
ASTM A325 Type 1 Carbon Steel 0.30-0.52 0.15-0.30 0.6 0.04 0.05
Carbon Boron Steel 0.30-0.52 0.15-0.30 0.6 0.04 0.05 0.0005-0.003
Alloy Steel 0.30-0.52 0.15-0.35 0.6 0.035 0.04 A
Alloy Boron Steel 0.30-0.52 0.15-0.35 0.6 0.035 0.04 0.0005-0.003 A
Chemical Requirements for Type 1 Bolts, Product Analysis
Grades Material C Si Mn, ≤ P, ≤ S, ≤ B Alloying Elements
ASTM A325 Type 1 Carbon Steel 0.28-0.55 0.13-0.32 0.57 0.048 0.058
Carbon Boron Steel 0.28-0.55 0.08-0.32 0.6 0.04 0.05 0.0005-0.003
Alloy Steel 0.28-0.55 0.13-0.37 0.6 0.04 0.045 A
Alloy Boron Steel 0.28-0.55 0.13-0.37 0.6 0.04 0.045 0.0005-0.003 A

ASTM A325 Bolt Strength

ASTM A325 bolt strength are summarized in the table bellow inluding tensile strength, yield strength and hardness, etc.

Notes:

The stress area is calculated as follows:

As = 0.7854 [D-(0.9743/n)]

  • As = stress area, in2,
  • D = nominal bolt size, and
  • n = threads per inch.
Tensile Requirements for Full-Size Bolts, Studs, and Threaded Rod
Bolt Size, Threads per Inch, and Series Designation Stress Area, in. Tensile Load, lbf, ≥ Proof Load, Length Measurement Method Alternative Proof Load, Yield Strength Method
1/2 – 13 UNC 0.142 17,050 12,050 13,050
5/8 – 11 UNC 0.226 27,100 19,200 20,800
3/4 – 10 UNC 0.334 40,100 28,400 30,700
7/8 – 9 UNC 0.462 55,450 39,250 42,500
1 – 8 UNC 0.606 72,700 51,500 55,750
1 1/8 – 7 UNC 0.763 80,100 56,450 61,800
1 1/4 – 7 UNC 0.969 101,700 71,700 78,500
1 3/8 – 6 UNC 1.155 121,300 85,450 93,550
1 1/2 – 6 UNC 1.405 147,500 104,000 113,800

A325 bolt grade loads tabulated are based on the following:

Bolt Size, in. Tensile Strength, ksi Length Measurement Method, ksi Yield Strength Method, ksi
1/2 to 1 120 85 92
1 1/8 to 1 1/2 105 74 81

Hardness Requirements

Hardness Requirements for Structural Bolts, Studs, and Threaded Rod
Bolt Size, in Nominal Length, in. Hardness
Brinell, HB Rockwell B
1/2 – 1 < 2D 253-319 25-34
2D, ≥ ≤319 ≤34
1 1 /8 – 1 1 /2 < 3D 223-286 19-30
3D, ≥ ≤286 ≤30
D = Nominal diameter or thread size.

A325 Bolt Dimensions Chart

ASTM A325 bolt dimensions chart and sizes are listed in the table and drawing below.

Notes of Para. in ASME B18.2.6 -2019

ASTM A325 bolt dimensions chart
ASTM A325 Bolt Dimensions
Table 2.1-1, Dimensions of Heavy Hex Structural Bolts A325
Nominal Size or Basic Product Diameter, inch Body Diameter (Max-Min), E Width Across Flats, F Width Across Corners, G Head Height, H Radius of Fillet, R Thread Length, L T Transition Thread Length, Y Maximum Total Runout of Bearing Surface, FIM
Nominal Max-Min Nominal Max-Min
1/2 (0.500) 0.515-0.482 7/8 0.875-0.850 1.010-0.969 5/16 0.323-0.302 0.031-0.009 1.00 0.19 0.016
5/8 (0.625) 0.642-0.605 1 1/16 1.062-1.031 1.227-1.175 25/64 0.403-0.378 0.062-0.021 1.25 0.22 0.019
3/4 (0.750) 0.768-0.729 1 1/4 1.250-1.212 1.443-1.383 15/32 0.483-0.455 0.062-0.021 1.38 0.25 0.022
7/8 (0.875) 0.895-0.852 1  7/16 1.438-1.394 1.660-1.589 35/64 0.563-0.531 0.062-0.031 1.50 0.28 0.025
1 (1.000) 1.022-0.976 1 5/8 1.625-1.575 1.876-1.796 39/64 0.627-0.591 0.093-0.062 1.75 0.31 0.028
1 1/8 (1.125) 1.149-1.098 1 13/16 1.812-1.756 2.093-2.002 11/16 0.718-0.658 0.093-0.062 2.00 0.34 0.032
1 1/4 (1.250) 1.277-1.223 2 2.000-1.938 2.309-2.209 25/32 0.813-0.749 0.093-0.062 2.00 0.38 0.035
1 3/8 (1.375) 1.404-1.345 2  3/16 2.188-2.119 2.526-2.416 27/32 0.878-0.810 0.093-0.062 2.25 0.44 0.038
1 1/2 (1.500) 1.531-1.470 2 3/8 2.375-2.300 2.742-2.622 15/16 0.974-0.902 0.093-0.062 2.25 0.44 0.041

A325 Nut Dimensions

A325 Nut Dimensions
A325 Nut Dimensions
Table 3.1-1, Dimensions of Heavy Hex Nuts for Use With Structural Bolts
Nominal Size or Basic Major Diameter of Thread, in. Width Across Flats, F Width Across Corners, G Thickness, H Radius of Fillet, R Total Runout of Bearing Face FIM, Heavy Hex Nuts, Specified Proof Load
Nominal, in. Max-Min, in. Nominal, in. Max-Min <150 ksi ≥150 ksi
1/2 (0.500) 7/8 0.875-0.850 1.010-0.969 31/64 0.504-0.464 0.031-0.009 0.023 0.016
5/8 (0.625) 1 1/16 1.062-1.031 1.227-1.175 39/64 0.631-0.587 0.062-0.021 0.025 0.018
3/4 (0.750) 1 1/4 1.250-1.212 1.443-1.383 47/64 0.758-0.710 0.062-0.021 0.027 0.020
7/8 (0.875) 1 7/16 1.438-1.394 1.660-1.589 55/64 0.885-0.833 0.062-0.031 0.029 0.022
1 (1.000) 1 5/8 1.625-1.575 1.876-1.796 39/64 1.012-0.956- 0.093-0.062 0.031 0.024
1 1/8 (1.125) 1 13/16 1.812-1.756 2.093-2.002 1 7/64 1.139-1.079 0.093-0.062 0.033 0.027
1 1/4 (1.250) 2 2.000-1.938 2.309-2.209 1 7/32 1.251-1.187 0.093-0.062 0.035 0.030
1 3/8 (1.375) 2 3/16 2.188-2.119 2.526-2.416 1 11/32 1.378-1.310 0.093-0.062 0.038 0.033
1 1/2 (1.500) 2 3/8 2.375-2.300 2.742-2.622 1 15/32 1.505-1.433 0.093-0.062 0.041 0.036

A325 Washer Dimensions

A325 Washer Dimensions
A325 Washer Dimensions

Table 4.1.1-1, Dimensions for Hardened Steel Circular and Circular Clipped Washers

Basic Size or Nominal Washer Size, inch Inside Diameter, I.D. Outside Diameter, O.D. Thickness, T Minimum Edge Distance, E
Nominal Max-Min Nominal Max-Min Max-Min
1/2 (0.500) 0.531 0.531-0.563 1.063 1.031-1.095 0.097-0.177 0.438
5/8 (0.625) 0.688 0.688-0.720 1.313 1.281-1.345 0.122-0.177 0.547
3/4 (0.750) 0.813 0.813-0.845 1.469 1.437-1.501 0.122-0.177 0.656
7/8 (0.875) 0.938 0.938-0.970 1.750 1.718-1.782 0.136-0.177 0.766
1 (1.000) 1.063 1.063-1.085 2.000 1.937-2.063 0.136-0.177 0.875
1 1/8 (1.125) 1.188 1.188-1.251 2.250 2.187-2.313 0.136-0.177 0.984
1 1/4 (1.250) 1.375 1.375-1.438 2.500 2.437-2.563 0.136-0.177 1.094
1 3/8 (1.375) 1.500 1.500-1.563 2.750 2.687-2.813 0.136-0.177 1.203
1 1/2 (1.500) 1.625 1.625-1.688 3.000 2.937-3.063 0.136-0.177 1.313

A325 washer dimensions

Table 4.2.1-1, Dimensions of Hardened Beveled Washers With Slope or Taper in Thickness 1:6
Basic Size or Nominal Washer Size, inch Inside Diameter, I.D. Minimum Side Length, A Thickness, T Minimum Edge Distance, E
Nominal Max-Min
1/2 (0.500) 0.531 0.531-0.563 1.75 0.313 0.438
5/8 (0.625) 0.688 0.688-0.720 1.75 0.313 0.547
3/4 (0.750) 0.813 0.813-0.845 1.75 0.313 0.656
7/8 (0.875) 0.938 0.938-0.970- 1.75 0.313 0.766
1 (1.000) 1.125 1.125-1.188 1.75 0.313 0.875
1 1/8 (1.125) 1.250 1.250-1.313 2.25 0.313 0.984
1 1/4 (1.250) 1.375 1.375-1.438 2.25 0.313 1.094
1 3/8 (1.375) 1.500 1.500-1.563 2.25 0.313 1.203
1 1/2 (1.500) 1.625 1.625-1.688 2.25 0.313 1.313

Dimensions for Compressible Washer-Type Direct Tension Indicators

Table 5.1-1, Dimensions for Compressible Washer-Type Direct Tension Indicators, inch
Direct Tension Indicator Size All Types Types 325-1, 325-3 Types 490-1, 490-3
Inside Diameter, A (Min-Max) Protrusion Tangential Diameter, B, ≤ Thickness, Without Protrusion, E, ≥ With Protrusion, F, ≤ Outside Diameter, C (Min-Max) Outside Diameter, C (Min-Max)
1/2 (0.500) 0.520-0.527 0.788 0.104 0.18 1.031-1.187 1.031-1.375
5/8 (0.625) 0.651-0.658 0.956 0.126 0.22 1.281-1.375 1.281-1.625
3/4 (0.750) 0.783-0.790 1.125 0.126 0.24 1.437-1.625 1.437-1.750
7/8 (0.875) 0.914-0.921 1.294 0.142 0.26 1.718-1.875 1.718-2.000
1 (1.000) 1.043-1.052 1.463 0.158 0.27 1.937-2.000 1.937-2.250
1 1/8 (1.125) 1.174-1.183 1.631 0.158 0.28 2.187-2.250 2.187-2.500
1 1/4 (1.250) 1.306-1.315 1.800 0.158 0.28 2.437-2.500 2.437-2.750
1 3/8 (1.375) 1.437-1.446 1.969 0.158 0.28 2.687-2.750 2.687-3.000
1 1/2 (1.500) 1.568-1.577 2.138 0.158 0.28 2.937-3.000 2.937-3.250

Dimensions of Twist-Off-Type Structural Bolts

Dimensions of Twist-Off-Type Structural Bolts

Table 6.1.1-1, Dimensions of Twist-Off-Type Structural Bolts: Heavy Hex Head and Round Head Configurations
Nominal Size or Basic Major Diameter or Thread and Threads per Inch Heavy Hex Head Heavy Heit and Round Head Round Head Radius of Fillet, R (Max-Min.) Thread Length, Lr Spline Length, Ls Spline Width Across Flats, S Maximum Center of Groove to First Fully Formed Thread, U Transition Thread Length, Y Maximum Total Runout of Bearing Surface FIM,
Width Across Flats, F (Max-Min.) Width Across Corners, G (Max-Min.) Head Height, H (Max-Min.) Full Size Body Dia. E (Max-Min.) Head Dia. D, ≤ Bearing Dia. C, ≥
1/2 – 13 (0.500) 0.875-0.850 1.010-0.969 0.323-0.302 0.515-0.482 1.126 0.89 0.031-0.009 1.00 0.50 0.32 0.192 0.19 0.016
5/8 – 11 (0.625) 1.062-1.031 1.227-1.175 0.403-0.378 0.642-0.605 1.313 1.102 0.062-0.021 1.25 0.60 0.43 0.227 0.22 0.019
3/4 – 10 (0.750) 1.250-1.212 1.443-1.383 0.483-0.455 0.768-0.729 1.58 1.338 0.062-0.021 1.38 0.65 0.53 0.25 0.25 0.022
7/8 – 9 (0.875) 1.438-1.394 1.660-1.589 0.563-0.531 0.895-0.852 1.88 1.535 0.062-0.031 1.50 0.72 0.61 0.278 0.28 0.025
1 – 8 (1.000) 1.625-1.575 1.876-1.796 0.627-0.591 1.022-0.976 2.158 1.771 0.093-0.062 1.75 0.80 0.7 0.313 0.31 0.028
1 1/8 – 7 (1.125) 1.812-1.756 2.093-2.002 0.718-0.658 1.149-1.098 2.375 1.991 0.093-0.062 2.00 0.90 0.8 0.367 0.34 0.032
1 1/4 – 7 (1.250) 2.000-1.938 2.309-2.209 0.813-0.749 1.277-1.223 2.76 2.213 0.093-0.062 2.00 1.00 0.9 0.367 0.38 0.035

ASTM A307 Bolts, ASTM A572 Grade 50 Steel, AISI 304 Stainless Steel

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