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Cable Bend Radius Calculator 

Calculate the minimum bend radius for cables and wire harnesses using IPC/WHMA-A-620, NASA, or custom engineering requirements.

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Input Parameters

Use optimum as the preferred design target where space allows. Treat minimum as the lower limit.

IPC bend radius values are class-based minimums.

Enter multiplier as OD factor, e.g. 10 for 10 x OD.

Results

Minimum Bend Radius

80 mm

3.15 in

10 x Cable Diameter

Source
IPC/WHMA-A-620
Type
Flexible coaxial cable
Requirement
Class 1
Cable bend radius is measured toward the inside curve Cable OD = 8 mm R = 80 mm Measured toward inside Target radius Minimum limit Note: OD = outside diameter
Wider At or Above Target Tighter
Preview bend: 80 mm

Calculation Reference

  • Bend Radius = Cable Outer Diameter x Multiplier
  • NASA values can be optimum targets or minimum limits.
  • IPC/WHMA-A-620 values are minimum requirements by product class.

IPC/WHMA-A-620 values are class-based minimum bend radius requirements. Use the cable manufacturer specification where required.

Quick Reference

Flexible coaxial cable 10x OD minimum
Fixed coaxial cable 5x OD minimum
Ethernet cable 4x OD minimum
OD = outside diameter

This calculator provides engineering guidance only. For critical applications, verify against the governing standard, manufacturer datasheet, drawing notes, and program-specific requirements.