Can I replace Gr L7M with Gr HT 12.9?
Can I replace Gr L7M with Gr HT 12.9?
(OP)
I have problem to source locally hex. socket cap screw with material L7M. I only can get grade HT 12.9, can use HT12.9 to reeplace L7M?
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Can I replace Gr L7M with Gr HT 12.9?
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RE: Can I replace Gr L7M with Gr HT 12.9?
RE: Can I replace Gr L7M with Gr HT 12.9?
Only the small screw I wonder to use HT12.9. Because I found that the tensile strength much more higher than L7M but the elongation much smaller than L7M. Also the hardness much more higher than L7M.
RE: Can I replace Gr L7M with Gr HT 12.9?
RE: Can I replace Gr L7M with Gr HT 12.9?
It may be possible to use property class 12.9 SHCS (ISO 898-1) or stainless SHCS (ISO 3506) depending on the environment, preload requirements (stress in fastener), etc. If the engineer/designer who specified SHCS using ASTM A 320 L7M is someone other than you, then you need to contact them about this issue. I would be concerned using PC 12.9 SHCS in a low temperature environment unless the 12.9 SHCS were made from an alloy steel like SAE 4140 or 4340 and tempered at a relatively high temperature (> 425 C).