Short answer
Clamp or fitting torque depends on the product code, size, material and assembly condition concerned. A safe torque should not be determined by looking at the screw diameter or by taking a value from another brand's table; the manufacturer's instructions govern.
Technical explanation
Torque is a control input of the tightening process; it is not a direct and universal guarantee of sealing. Lubrication, surface condition, bolt or screw design and connection geometry can affect the result. Overtightening can cause problems just as undertightening can. For some assemblies, position, clearance or other control criteria are defined in addition to torque. Additional tightening not specified in the manufacturer's instructions should not be automatically accepted as a maintenance method.
Topic-specific checkpoints
| Item | Description |
|---|---|
| Source | Instructions tied to product and revision |
| Conditions | Material, surface and lubrication |
| Tool | Suitable range and calibration |
| Result | Assembly geometry together with torque |
How is it assessed in practice?
Write in the work order not just the number but the torque source and its revision. Record the identification of the wrench used and its required calibration status. Do not combine different clamps with the same nominal screw size in a single-line torque table. If instructions are missing, do not present workshop habit as manufacturer approval; ask for written data. In a leak investigation, evaluate the torque record together with correct part matching and surface inspection.
Original editorial recommendation; not a clause of a standard.
Frequently asked questions
Does tightening more always reduce leakage?
No. Overtightening can cause damage; the correct combination and the manufacturer's assembly method must be applied.
Source coverage
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S017
Parker Safety Guide, Publication 4400-B.1 Parker Hannifin · accessed 2026-10-20 PDF page 3; 3.1 Component Inspection, 3.2 Hose and Fitting Assembly and 3.3 Related Accessories
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S029
Ürünler Kale Clamp · accessed 2026-10-19 List of product families
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S035
Hose Clamps Tork Clamps · accessed 2026-10-19 Types of hose clamps