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Hexagonal nut / coffee - H20, H21
A Jam Nut is often 2/3 the depth of their individual Hex Nut Series.A Huge Hex as well as Finished Hex Nut can be tightened up against the work area, where a Jam Nut can be anchored up against the Nut to make sure that the Nut will not get loose.
The series H20 Hex Jam Nuts are used with Series H10 Concluded Hex Nut products. The series H21 Heavy Hex Jam Nuts are used with H11 Heavy Hex Nuts.