Spring Contact / Contact Compression Calculator

Calculate contact force, contact resistance, contact heating, and spring-back for electrical spring contacts

Contact Geometry

Material

Operating Conditions

A
°C
Design looks good
Reliable Contact
0.384
Contact Force (N)
7.96
Total Resistance (mΩ)
3.26
Safety Factor (-)
R = 7.96 mΩσ = 307 MPaSF = 3.26Spring-back: 0.5 mmP = 7.96 mWF = 0.384 Nδ = 0.5 mmL = 8 mmt = 0.2 mm

Results

Contact Force(F)
0.384N
Total Resistance(R)?
7.96mΩ
Safety Factor(SF)?
3.26-
Spring Rate(k)
0.768N/mm
Bending Stress(σ)
307.0MPa
Deflection Limit(δ_max)?
1.628mm
Spring-Back(δ_e)?
0.500mm
Contact Spot Radius(a)
5.746µm
Constriction Resistance(R_c)
6.09mΩ
Spring Body Resistance(R_b)
1.87mΩ
Contact Voltage(U_c)?
6.09mV
A-Spot Temperature(T_a)?
21.7°C
Spring Body Temperature(T_b)?
21.0°C
Power Dissipation(P)?
7.96mW

Force & Resistance vs. Deflection

Force
Total resistance
Operating Point

Created by Catlynn Nguyen & Jie Chai · 2026