NOTE: Steel maillons are stamped with a “Working Load Limit” (WLL) corresponding to 20% of their minimum breaking strength (BL). The WLL is the maximum load the manufacturer guarantees will not deform the maillons, allowing opening of the screw closure with fingers.
WARNING: When using steel maillons, double-check and triple-check that they are screwed shut properly as part of every pre-flight check. Tightening should be done with fingers. A spanner may be used carefully, just give them a ‘nip’. DO NOT OVER-TIGHTEN as this will weaken the maillon! Threadlock compound or liquid is not recommended.