Bolt Shear Capacity

Calculate bolt shear and slip-critical strength per AISC Specification

Design Method

ASTM Grade

Bolt Diameter

Number of Bolts

Connection Type

N: Threads in shear plane, X: Threads excluded, SC: Slip-Critical

Results

Bolt Area (Ab)0.442in²

Design Factor (Ω)2

Shear Strength (Fnv)68ksi

Tensile Strength (Fnt)90ksi

Allowable Shear Strength15.02kips

Formula Display

Bolt Area (Ab) = π × d² / 4 = π × 0.75² / 4 = 0.4418 in²

Design Factor: Ω = 2.0

Fnv = 68 ksi (X type)

Shear Strength = (Ab × Fnv × n) / Ω = (0.4418 × 68 × 1) / 2.0 = 15.02 kips

Reference: Stress Constants (AISC Table J3.2)

Grade	Fnt (ksi)	Fnv - N (ksi)	Fnv - X (ksi)
A307	45	27	27
A325	90	54	68
A490	113	68	84

Minimum Bolt Pretension (AISC Table J3.1)

A325

d (in)	Tb (kips)
0.625	19
0.75	28
0.875	39
1.0	51
1.125	64
1.25	81
1.375	97
1.5	118

A490

d (in)	Tb (kips)
0.625	24
0.75	35
0.875	49
1.0	64
1.125	80
1.25	102
1.375	121
1.5	148

Disclaimer: These calculations are for educational and preliminary design purposes only. Always verify results with qualified engineering analysis before use in actual construction.