physical+properties+of+heavy+hex+structural+bolts+astm+a325+type 1
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Physical Properties – Inch Series
Heavy hex Structural Bolts A325
Physical Properties
Bolt Size Type '1' Type '1'
1/2" to 1" 1-1/8" to 1-1/2"
Tensile Strength (Min.) Psi (N/mm2) 120,000 (827) 105,000 (724)
Proof Load Stress (Min.) Psi (N/mm2) 85,000 (586) 74,000 (510)
Yield Strength (Min.) Psi (N/mm2) 92,000 (635) 81,000 (560)
Hardness [HR] Bolt Length <2D C25-C34 Bolt Length 32D C19-C30
Bolt Length <2D over C34 (Max) Bolt Length <3D and over C30 (Max)
Elongation in 4D (Min.) [%] 14 14
Reduction of Area (Min.) [%] 35 35
Rotational Capacity Test For Zinc Coated Bolts
Bolt Length in Nominal Nut Rotation Degree (Turn) <4D 240 (2/3)
4D<8D 360 (1) 8D<12D 420 (1-1/8)
12D<Over Test Not Applicable
Recommended Tightening Torques and Included Loads
Thread Size Stress Size Torque in
Induced Load Un-lubricated Finish Lubricated Finish
UNC/UN in2 Ft - lb Ft - lb K-lbf
1/2"-13 UNC 0.142 76.20 57.15 9.145
5/8"-11 UNC 0.226 151.61 113.70 14.554
3/4"-10 UNC 0.334 268.86 201.64 21.51
7/8"-9 UNC 0.462 433.89 325.41 29.750
1"-8 UNC 0.606 650.44 487.83 39.026
1-1/8"-8 UNC 0.790 839.87 629.90 44.793
1-1/4"-8 UNC 1.000 1,181.25 885.93 56.700
1-3/8"-8 UNC 1.233 1,602.13 1201.59 69.911
1-1/2"-8 UNC 1.492 2,114.91 1586.18 84.60
Note:
• The tightening torques are calculated to induce stress equal to approximately 70% of yield stress. • The tightening torques of lubricated finished is 75% of the values stated unduplicated finish.
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Nominal Thread Size-D
TPI F Max.
G Max.
B Max.
H Nom. R Min.
Length of Thread LT Length
Range LT UNC
1/2" 13 0.875" 1.010" 0.515" 5/16" 0.009" 1.00" 1-1/2"-4"
5/8" 11 1.062" 1.227" 0.642" 25/64" 0.021" 1.25" 1-1/2"-8"
3/4" 10 1.250" 1.443" 0.768" 15/32" 0.021" 1.38" 1/2"-8"
7/8" 9 1.438" 1.660" 0.895" 35/64" 0.031" 1.50" 1-1/2"-8"
1" 8 1.625" 1.876" 1.022" 39/64" 0.062" 1.75" 1-1/2"-8"
1-1/8" 8UN 1.812" 2.093" 1.149" 11/16" 0.062" 2.00" 2"-8"
1-1/4" 8UN 2.000" 2.309" 1.276" 25/32" 0.062" 2.00" 2"-8"
1-3/8" 8UN 2.188" 2.526" 1.404" 27/32" 0.062" 2.25" 2-1/2"-8"
1-1/2" 8UN 2.375" 2.742" 1.522" 15/16" 0.062" 2.25" 2-1/2"-8"
Note:
• The Bolt will generally conform to ANSI/ASME B 18.2.1 Hex Heavy Structural Bolts. • Thread will conform to Class 2 A of ANSI B1.1 Course Series. • Material : MEDIUM CARBON / ALLOY STEEL. • Heat Treatment Type 1 as per ASTM A 325. • All Dimensions are in Inches.