🔩 Nut Proof Load Calculator IS 1367 | M12-M36 Chakan MIDC 2026

🔩 Metric Nut Proof Load Calculator

🔩 Nut Size M12 M16 M20 M24 M27 M30 M36

⚙️ Property Class Class 4 (400 N/mm²) Class 6 (600 N/mm²) Class 8 (800 N/mm²) Class 10 (1000 N/mm²) Class 12 (1200 N/mm²)

📏 Nut Type Regular Height (0.8D) Low Height (0.5D) High Height (1D)

0 kN

Click Calculate

🇺🇸 For U.S. Fastener & Manufacturing Professionals

Quickly estimate metric nut proof loads for maintenance, automotive, fabrication, machinery, and general engineering work.

Results are shown in kN. Always verify final design and inspection requirements against the standard and specifications required by your project.

🔩 Metric Nut Proof Load Guide for U.S. Users

This metric nut proof load calculator helps engineers, mechanics, buyers, inspectors, and manufacturing teams estimate the axial proof load of common metric nuts. Select the nut size, property class, and nut height to get an instant result in kilonewtons (kN).

How the calculator works: the estimated proof load is calculated from the selected stress area, proof stress, and a height adjustment factor. This makes it useful for quick comparisons during fastener selection, incoming inspection, maintenance planning, and shop-floor checks.

Common metric nut sizes used in U.S. industrial applications include M12, M16, M20, M24, M27, M30, and M36. Property classes 8, 10, and 12 are frequently encountered in higher-strength metric fastener systems, while lower classes may be used where lower strength is acceptable.

Important: this calculator is an engineering reference tool, not a substitute for the governing drawing, purchase specification, test certificate, or applicable fastener standard. Confirm the exact proof-load requirement before production, inspection, or safety-critical use.

• Fast result: proof load displayed in kN
• Metric sizes: M12 through M36
• Property classes: 4, 6, 8, 10 and 12
• Nut height options: low, regular and high
• Useful for: manufacturing, automotive, maintenance and engineering

❓ Metric Nut Proof Load FAQ

What is nut proof load?+

Nut proof load is the specified axial load a nut should withstand during a proof test without thread stripping or other unacceptable permanent damage.

What does a metric nut property class mean?+

The property class identifies a strength category for metric fasteners. The required class should match the engineering drawing, mating bolt, and applicable specification.

Can U.S. companies use metric fasteners?+

Yes. Metric fasteners are widely used in U.S. automotive, machinery, equipment, construction, maintenance, and global supply-chain applications.

Is this calculator suitable for final engineering approval?+

Use it as a quick reference only. For final engineering, purchasing, inspection, or safety-critical decisions, verify the value against the exact standard and project specification.