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Fastener Torque Spec Conversion Log Worksheet

Torque values arrive in mixed units from drawings, supplier manuals and customer specs. This log keeps one source value per joint and shows the matching values in the units your wrenches and work instructions use.

Download:

Torque (N-m)	Torque (in-lb)	Torque (kgf-m)	Minimum (N-m)	Maximum (N-m)
115.2445	1,020	11.7517	103.7201	126.769
24.4047	216	2.4886	21.9642	26.8452
230.489	2,040	23.5033	218.9646	242.0135
5.9656	52.8	0.6083	5.0708	6.8604
44.742	396	4.5624	40.2678	49.2162

Joints logged

Highest torque (N-m)

230.489

Conversion factors: 1 ft-lb = 1.3558179 N-m, 1 N-m = 0.101972 kgf-m. Always follow the torque value and lubrication condition stated on the engineering drawing.

Find unit mismatches in your routings

Optional review of how torque and material specs are stored across your drawings and ERP.

Optional. The tool and every export work without this. No spam.

How to use the log

Add a row for each controlled joint. Enter the source value in foot-pounds and the tolerance as a percentage. The sheet shows the same torque in N-m, in-lb and kgf-m, plus the minimum and maximum in N-m for wrench setting and audit checks. Record the source document so that the engineer who updates a drawing knows which row to change.

Log the document and revision for every value
Use the tolerance from the drawing
Export to Excel for the work instruction package
Review whenever a drawing is revised

Conversion factors used

One foot-pound equals 1.3558179 newton-meters. One foot-pound is also 12 inch-pounds. One kilogram-force meter is 9.80665 newton-meters, so dividing newton-meters by 9.80665 gives kgf-m. For example, 85 ft-lb is 115.2 N-m, 1020 in-lb and 11.75 kgf-m. Use the full factor rather than a rounded 1.36, since rounding errors add up when you convert high-torque joints with tight tolerances.

Practical notes for the shop floor

A torque number means little without the joint condition. Dry, oiled, plated or anti-seize treated threads give different clamp force for the same torque, so note the lubrication assumption in the source document. Choose a wrench whose range puts the target value in the middle of its scale, and keep the calibration status visible. If torque is controlled by angle or tension, this log is only a companion and not the controlling specification.

Do not round the target before applying tolerance
Mark torque-angle joints separately
Confirm wrench calibration before use

Frequently Asked Questions

How do I convert ft-lb to N-m?

Multiply foot-pounds by 1.3558179. For example 50 ft-lb is 67.8 N-m. To go the other way, divide newton-meters by 1.3558179 or multiply by 0.737562.

What is the difference between N-m and kgf-m?

A newton-meter is the SI unit. A kilogram-force meter is a legacy gravitational unit, equal to 9.80665 N-m. Some Asian and older European manuals still use kgf-m, so conversion matters on imported equipment.

Should I apply tolerance to the converted value?

Apply the tolerance stated on the drawing to the target value, in whichever unit you control. This sheet does it on the exact converted value, which avoids stacking rounding errors.

Can this replace the engineering drawing?

No. The drawing is the controlling document. This log is a convenience that holds converted values for work instructions and must be updated whenever the drawing revision changes.

If torque specs live in drawings, PLM and ERP routings with different units, we can build an agent that finds mismatches across them.

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