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First Look: Garage Torsion Spring Balance Reference Standard: Relevant material and performance testing standards should be confirmed against the buyer drawing, spring wire specification, and load requirement. When a steel spring wire grade is separately specified, buyers may reference recognized organizations such as ASTM International for material test methods and NIST for measurement-traceability principles. Short Answer A garage door torsion spring should be evaluated by rotation return consistency, not only by whether it can lift the door once after installation. The catalog data shows torsion spring options with 50 mm, 65 mm, 93 mm, and 132 mm inside diameters, matching wire diameter ranges from 5.0–6.8 mm up to 7.0–10.5 mm, … 続きを読む