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Fine and extra-fine threads are closely spaced to prevent loosening from vibration: the finer the thread
These locknuts have good chemical resistance and may be mildly magnetic
It is made of plain alloy steel and thus provides low resistance to corrosion in dry and wet environments
The screw has a length of 5" and a thread of 1-3/4-5
The screws have a thread of 1-3/4-5 and a length of 12
Square Head Screw Fine & Full Thread Black-Oxide Alloy Steel 1-14 * 2-1/2" Grade 8 [Cup Point] [External Square Drive] plug Fine and extra-fine threads areUse these set screws for light duty holding. A square head allows them to be turned by hand, or fastened with a wrench when you need more torque. The cup point has a thin edge that digs into the contact surface for a secure hold. Length is measured from under the head. The screw has a length of 2 1 2" and a thread of 1 14.
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