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ICON Ratchet Torture Test 3/8 Flex Head Destroyed
As an example the standard for a 3/8" drive 6 or 12pt 19mm socket has a proof torque of 183 foot-pounds which equates to around 2200 lbf /in (pound force / inch, commonly called inch pounds or pound inch)
Standards defined for proof torque as: "When tested as specified tool or fastener shall withstand the applied tensile load without failure or permanent deformation that might affect the durability or serviceability of specified tool or fastener." (ASME B107.2-2002)
So........depending on the size, 150-180 foot-pounds of torque is well within the capability of 3/8, at least 19mm. I suspect that many 3/8" drive sockets, ratchets and breaker bars are at that size are capability of handling even more torque. The ASME standard is the minimum requirement, not an absolute upper limit.
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