ASTM A 194 2H ASTM A 194 2H chti (Materials) (OP) 23 Jan 13 17:04 Hi, Is the proof loading test always required for nuts? Should be stipulated in the order as a requirement?? Thank you for your help RE: ASTM A 194 2H TVP (Materials) 24 Jan 13 10:15 Yes, proof load testing is a requirement for nuts purchased according to ASTM A194. See section 7.2. RE: ASTM A 194 2H chti (Materials) (OP) 24 Jan 13 15:26 Hi, Than you for your answer, but I read in § 7.2, that the proof loading test is an option and should be indicated in the purchase order , if we want that it shall be performed. Is it correct? It seems that suppliers do not perform the test if it is not added in order ! Thank you RE: ASTM A 194 2H TVP (Materials) 24 Jan 13 17:15 I initially looked at an older version of ASTM A194. The latest version shows the requirements for Proof Load Testing in section 8.2. Here is an excerpt: 8.2 Proof Load Test: 8.2.1 Requirements—All nuts shall be capable of withstanding the proof loads specified in Table 3 and Table 4. However, nuts manufactured to dimensions and configurations other than those covered by ANSI B 1.1, ANSI B 1.13M, ANSI B 18.2.2, and B 126.96.36.199M are not subject to the proof load test. RE: ASTM A 194 2H kmenke (Mechanical) 20 Feb 13 14:48 188.8.131.52 helps a little further. Basically for hex, heavy hex and jam nuts, proof load testing would be required for those with a proof load of 160,000 lb. For those with proof loads higher than 160,000 lb, you could stipulate Supplemental S4 requirement if you want the proof load tested.