|The MS21259 series stud end fittings are manufactured from stainless steel to the strict standards of MS21259. They are certified to the MS21259 standard.
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The MS21259-4LH has 1/4-28 left hand thread. It will thread into a 1/4-28 left hand threaded unit.
Yes. These are stainless.
No, the studs are fully threaded. MS21260 is a turnbuckle is the same length just shorter thread.