Engineering tool
Spring rate converter
N/mm, kgf/mm and lbf/in on one page, plus force, length and torque-per-degree. We quote in metric.
Spring rate
Enter a value to convert.
Force
Enter a value to convert.
Length
Enter a value to convert.
Torque per degree
Enter a value to convert.
Method
1 kgf = 9.80665 N. 1 in = 25.4 mm. 1 lbf = 4.4482216152605 N. Rate converts as force over length, so 1 N/mm = 25.4 / 4.44822 ≈ 5.71 lbf/in. Torque per degree scales by the same force and length factors.
We work in millimetres and newtons. If the drawing uses kgf or inches, convert it here and send both sets of numbers on the quote.
Questions
What is 1 N/mm in kgf/mm and lbf/in?
1 N/mm is about 0.102 kgf/mm and about 5.71 lbf/in. The converter uses 1 kgf = 9.80665 N and 1 in = 25.4 mm.
Which unit do you quote in?
Metric: mm, N and N/mm. If your drawing is in kgf or inches, convert it here and send both.
Request for quotation
Send your drawing or sample. Get a quote within 24 hours.
Tell us the spring type, quantity and what it has to do. Our usual minimum order is 5,000–10,000 pcs; smaller development runs are charged.