VitraLab Steel Bolt Shear Tool

Tool preview only. This page is not connected to Django, reports, database, or the live calculator.

1. Action

ULS Shear Input

Applied ULS shear on one bolt (kN) Number of shear planes

Applied shear may be entered for one bolt after load distribution has already been checked by the engineer.

2. Bolt grade

Strength and Factors

Bolt grade / property class Code basis Bolt strength, f_ub (N/mm2) γ_M2 α_v / α used

fub and alpha are auto-filled from the selected grade and shear plane. Both remain editable for project-specific data or National Annex review.

3. Shear plane

Area Selection

Threaded portion Unthreaded shank

Bolt diameter, d (mm) Calculated gross area, A_g = πd²/4 (mm2) Tensile stress area, A_s (mm2)

Threaded portion selected: bolt diameter is recorded and gross area is shown, but the formula uses tensile stress area As from the bolt standard or manufacturer's datasheet.

4. Area guide

Shear Plane Diagram

Basis: EN 1993 bolt shear resistance uses tensile stress area when the shear plane passes through threads, and gross shank area when it passes through the unthreaded portion.

Active shear plane: threaded portion. The tool uses the entered tensile stress area As.

5. Result

Shear Summary

Code basisEN 1993-1-8

Bolt grade-

Shear plane-

f_ub / γ_M2-

α_v / α-

Bolt diameter / gross area-

Area used-

F_v,Rd per shear plane-

Number of shear planes-

Total bolt shear resistance-

Applied ULS shear on one bolt-

Applied shear per plane-

Utilization-

Status-

Code applicability-

6. Code notes

Visible Method

Carbon steel bolts use EN 1993-1-8 bolt shear resistance per shear plane.
Stainless steel bolts use EN 1993-1-4 with the same area logic and recommended alpha values shown in the tool.
If the shear plane passes through threads, A is the tensile stress area As.
If the shear plane passes through the unthreaded shank, A is the gross bolt area pi d^2 / 4.
For carbon classes 4.6, 5.6, and 8.8 in threads, alpha_v is 0.6. For 4.8, 5.8, 6.8, and 10.9 in threads, alpha_v is 0.5.
For stainless bolts, recommended alpha is 0.6 through shank and 0.5 through threads.
Bearing, net section, block tearing, tension resistance, and combined shear/tension interaction remain separate checks.

This calculation is provided for preliminary guidance only. VitraLab does not certify or approve the final design. All structural designs must be reviewed and approved by a qualified engineer before manufacture, installation, or use.

7. Report preview

Steel Report

VitraLab

Steel Bolt Shear Strength Tool

Input Summary

Code basis-

Bolt grade-

Shear plane-

fub / gamma M2-

alpha-

Bolt diameter / gross area-

Area used-

Result Summary

Applied ULS shear on one bolt-

Number of shear planes-

Fv,Rd per shear plane-

Total bolt shear resistance-

Utilization-

Preliminary guidance only. VitraLab does not certify or approve final design. Review by a qualified engineer is required before use.