Complete bolt torque specifications and fastener torque charts for metric, imperial, UNC, UNF, BSW, and BSF threads. Find torque values for Grade 4.6, 8.8, 10.9, 12.9 metric bolts, SAE Grade 2, 5, and 8 fasteners, plus stainless steel A2/A4 specifications. Includes torque adjustments for dry, lightly lubricated, and heavily lubricated thread conditions. Based on ISO, ASTM, BS & SAE standards for accurate torque wrench settings across all common bolt sizes and applications.

Bolt torque chart | specifications calculator

Disclaimer:

The bolt torque reference guide provided on this website is for informational purposes only and is designed to offer general guidance for fastener torque specifications using standard industry values and established engineering practices. While this tool provides torque values based on ISO, ASTM, BS & SAE standards and includes adjustments for common thread conditions, the guidance provided is for educational purposes and may not substitute for manufacturer specifications, engineering calculations, or professional mechanical advice for your specific application.

Key Points to Consider:

General Reference Only: The torque specifications provide general values based on industry standards and common practices, but may not address specific material variations, environmental conditions, joint configurations, or critical application requirements unique to your installation.
Professional Installation Required: Fastener installation in structural, safety-critical, or high-stress applications should be performed by qualified engineers or technicians using calibrated torque wrenches. Incorrect torque application can result in joint failure, equipment damage, or serious injury.
Variable Real-World Factors: Actual torque requirements may vary significantly due to factors not covered in this reference, such as thread condition variations, coating differences, temperature effects, joint geometry, load cycling, corrosion protection requirements, and manufacturing tolerances.
Not Engineering Advice: This tool does not constitute professional engineering advice, design verification, or safety assessment. For critical applications, structural connections, or safety-sensitive installations, consult qualified mechanical engineers or fastener specialists.
Equipment Calibration Required: Accurate torque application requires properly calibrated torque wrenches and appropriate installation techniques. Uncalibrated tools or improper technique can result in significant torque variations and potential joint failure.
Manufacturer Specifications Override: Always consult manufacturer specifications, engineering drawings, and application-specific requirements which may differ from these general reference values. Many applications require specific torque procedures or non-standard values.
Tool Reliability: No warranty is provided regarding the accuracy, completeness, or continued functionality of this torque reference. The values, adjustment factors, and technical guidance are provided "as is" without guarantee of suitability for any specific application.
No Liability: The authors and affiliates accept no responsibility for any injury, damage, equipment failure, structural collapse, or other consequences arising from the use of this reference tool or following its guidance.

By using this tool, you acknowledge that you understand its limitations, accept that no guarantee of torque accuracy or application suitability is provided, understand when professional engineering advice is required, and agree to this disclaimer. For critical applications, safety systems, or structural connections, please contact qualified engineers or fastener specialists.