Bolt Torque Chart — Recommended Tightening Torque for Metric Bolts
Recommended tightening torque for metric coarse-thread bolts by property class (8.8, 10.9, 12.9). Free reference chart for mechanics, engineers and DIY users.
| Size | Thread pitch | Torque 8.8 (Nm) | Torque 10.9 (Nm) | Torque 12.9 (Nm) |
|---|---|---|---|---|
| M6 | 1 mm | 10 Nm | 14 Nm | 17 Nm |
| M8 | 1.25 mm | 24 Nm | 33 Nm | 39 Nm |
| M10 | 1.5 mm | 48 Nm | 67 Nm | 79 Nm |
| M12 | 1.75 mm | 84 Nm | 117 Nm | 137 Nm |
| M14 | 2 mm | 134 Nm | 187 Nm | 220 Nm |
| M16 | 2 mm | 204 Nm | 286 Nm | 335 Nm |
| M18 | 2.5 mm | 282 Nm | 395 Nm | 463 Nm |
| M20 | 2.5 mm | 400 Nm | 560 Nm | 657 Nm |
| M22 | 2.5 mm | 490 Nm | 686 Nm | 805 Nm |
| M24 | 3 mm | 560 Nm | 784 Nm | 920 Nm |
| M27 | 3 mm | 800 Nm | 1120 Nm | 1314 Nm |
| M30 | 3.5 mm | 1060 Nm | 1484 Nm | 1742 Nm |
Values are for clean, lightly oiled threads on standard fasteners. Always follow the manufacturer's specification for critical applications, and use a calibrated torque wrench.
Frequently Asked Questions
Are these tools free to use?＋
Yes, all calculators and converters on this page are completely free, with no registration or download required.
Are the conversion results accurate?＋
All calculations use standard international conversion factors and are accurate to 6 decimal places where relevant.
Can I use these tools on my phone?＋
Yes, every tool is fully responsive and works on mobile, tablet and desktop browsers.
Do you sell the tools mentioned on these pages?＋
Yes! We are a professional B2B supplier of power tools, hand tools, garden tools and agricultural machinery. Contact us for a factory-direct quote.
All Free Tools
Unit Converter
Convert between metric and imperial units used in the tool industry: length (inch/mm), weight (kg/lb), torque (Nm/ft-lb), power (kW/HP) and more. Free, instant and accurate.
Torque Conversion Calculator
Convert torque values between Newton-meter (Nm), foot-pound (ft-lb), inch-pound (in-lb) and kilogram-force meter (kgf-m). Essential for impact wrenches, torque wrenches and fastener specs.
Power Converter (kW/HP)
Convert power ratings between kilowatt (kW), horsepower (HP), metric horsepower (PS) and watt (W). Perfect for comparing engines, generators and power tools.
Pressure Converter
Convert pressure values between bar, PSI, MPa, kPa and kg/cm². Essential for air compressors, pressure washers and hydraulic systems.
Drill Bit Size Converter
Convert and compare drill bit sizes between fractional inches, wire gauge numbers, letter sizes and metric diameters. Includes a complete decimal inch and millimeter chart.
AWG to mm² Wire Gauge Converter
Convert American Wire Gauge (AWG) to square millimeters (mm²) and diameter, with ampacity reference for common applications. Essential for extension cords and power tools.
Cutting Speed & RPM Calculator
Calculate spindle RPM from cutting speed and workpiece diameter for drilling and milling. Includes recommended cutting speeds for common materials.
Chainsaw Chain Guide
Learn how to identify chainsaw chain pitch (1/4", 3/8", .325", 3/8" LP), gauge and link count. Free reference chart for chainsaw chain replacement.
Chainsaw Chain Length Calculator
Calculate chainsaw chain length from drive-link count and pitch. Enter your drive links and chain pitch to get the total chain length in inches, cm and mm.
Bolt & Screw Size Chart
Complete bolt, screw and wrench size reference: metric and imperial thread sizes, wrench sizes, hex key sizes and torque reference for common fasteners.
Air Compressor Size Calculator
Select your pneumatic tools to calculate the required CFM and recommended air compressor size. Free tool sizing calculator for workshops, garages and professionals.
Extension Cord Size Chart
Find the right extension cord gauge for your power tools. Enter the amp draw and cord length to get the recommended AWG, with a complete 18–10 AWG reference chart.
CC to HP Converter
Convert engine displacement (cc) to horsepower (HP) and back for small engines: chainsaws, brush cutters, tillers, generators and more. Includes the typical 14–17 cc per HP range.
Request a Quote
Tell us what you need — our sales team replies within 12 hours.
Do you sell the tools mentioned on these pages?
Yes! We are a professional B2B supplier of power tools, hand tools, garden tools and agricultural machinery. Contact us for a factory-direct quote.