Fastener Specification Tools

Quickly calculate required torque, clearance holes, and tap sizes for metric & imperial fasteners.

1Fastener Properties

Thread Designation

Material Grade

Finish / Lubrication

K-Factor (Nut Factor)

2Joint Geometry & Materials

Clamp Length (L_c)

Bolt Modulus (E_b)

GPa

Member Modulus (E_m)

GPa

3External Loads & Friction

Target Proof Load %

75%

External Axial Load (P_ext)

Joint Friction (μ)

Calculation Results

Recommended Torque

26.4Nm

Clamping Force (Preload)

16,470N

Shear & Joint Integrity

Shear Load Capacity (F_s)4,941 N

Joint Constant (C)0.168

Remaining Clamp Force (F_rem)12,311 N

Load Factor (N_b)3.96

Strength & Safety

Total Bolt Load (F_max)17,311 N

Required Stress Area32.06 mm²

Detailed Data

Proof Strength600 MPa

Current Stress Area36.60 mm²

Bolt Stiffness (K_b)151,524 N/mm

Member Stiffness (K_m)748,877 N/mm

Fastener Specification Tools

1Fastener Properties

2Joint Geometry & Materials

3External Loads & Friction

Calculation Results

Shear & Joint Integrity

Strength & Safety

Detailed Data

Frequently Asked Questions

What is K-Factor?

What is "Target Proof Load %"?

Why is my "Remaining Clamp Force" negative?

What is the difference between Torque and Tension?

What does "Thread Engagement" mean?

When should I use a locking fastener?