Download Technical Information
Preload and Tightening Torques
Download our technical guide with tables and reference values for preload and tightening torques for fasteners of different types, materials, and head shapes.
1.6 MB | pdfArrangement, Design, and Assembly
Technical Information on Preload and Tightening Torques
Get an overview of reference values for preload and tightening torques in an assembly, including tables for metric coarse threads, metric fine threads, tightening torques for plastic screws, and more.
Contents
This technical guide can be used to determine approximate values for selecting and tightening bolts, which can help to prevent bolt failure during assembly. Please note that this procedure does not replace calculations as defined in VDI 2230. In our download, you will find information on:
- How to use reference values
- Approximate values for metric coarse threads (VDI 2230)
- Approximate values for metric fine threads (VDI 2230)
- Stud bolts with reduced shank
- Tightening torques for plastic screws / Polyamide 6.6 and Polyamide 6.6-GF50
- Tightening torques (typical values) for brass screws (CU2)
- Approximate values for austenitic stainless steel A1, A2, and A4
- Fasteners with internal drives and lower head shape
- Flange screws and flange nuts
- Tightening torques ecosyn® SEF
- Reference values for tightening torque NORD-LOCK® wedge lock washers
- High strength structural bolts for steel constructions (HV sets)
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Torque and Preload Calculator
Standard Torque and Preload Calculator
Calculate tightening torque and preload and surface pressure for hex head and socket head screws.
Torque and Preload Calculator
Considering Nut Factor and Tool Accuracy (Metric)
Determine the tightening torque and preload using the nut factor K and wrench accuracy for metric screws.
Torque and Preload Calculator
Considering Nut Factor (Inch)
Determine the tightening torque and preload using the nut factor K for inch-sized screws.
Torque and Preload Calculator
Considering Nut Factor and Tool Accuracy (Inch)
Determine the tightening torque and preload using the nut factor K and wrench accuracy for imperial screws.
Torque and Preload Calculator
Considering Friction Scatter
Calculate tightening torque and preload for hex head and socket head screws, considering various friction coefficients.
Torque and Preload Calculator
Considering Customized Geometry and Material
Determine the tightening torque, preload, and surface pressure for hex head, socket head, and countersunk screws – all with various options for special geometry and strength of the selected fastener.
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