Standard Bolt Torque Chart — SAE & Metric by Grade
Engineering-accurate dry-torque values for every standard bolt size and grade: SAE Grade 2, 5, and 8 plus metric class 4.6, 8.8, 10.9, and 12.9. Values in both ft-lbs and Nm. Use this chart for general-purpose assembly torque — for vehicle-specific fasteners (lug nuts, caliper bolts, head bolts), use the vehicle lookup instead.
SAE Grade 5 and Grade 8 torque values
Grade 5 (three radial head marks) is the workhorse automotive/construction grade. Grade 8 (six marks) is used for high-stress applications like suspension, drivetrain, and flywheel bolts. Grade 2 (no marks) is hardware-store general purpose — not for anything structural. Values assume clean, dry threads; lubricated or plated bolts require a 15–25% reduction.
Metric class 8.8, 10.9, and 12.9 torque values
Metric property classes are stamped on the bolt head: 8.8 is roughly equivalent to SAE Grade 5, 10.9 to Grade 8, and 12.9 exceeds Grade 8. Class 4.6 is low-strength general-purpose. Torque specs follow ISO 898-1 and assume a 0.12 friction coefficient (clean dry steel-on-steel).
Dry vs lubricated torque
All values on this chart are DRY torque — clean, unlubricated threads. If the spec calls for anti-seize, engine oil, or thread-locker, reduce torque by 15–25%. Never apply dry torque to a lubricated bolt — you will over-stress and risk breaking the fastener.
When NOT to use this chart
Torque-to-yield (TTY) bolts, flange bolts, and OEM-specific fasteners have their own specs. Head bolts, main cap bolts, and connecting rod bolts on modern engines are almost always TTY — always check the FSM. This chart is for standard hex bolts in non-critical general assembly.
Related lookups
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