These square-neck screws have a square cross-section at the base of the shank under the head, and are used only with a washer and nut. For wood parts, the square collar imprints its imprint in the wood. For metal parts, lights fitted to the square collar. The head has no imprint, so tightening must be done by the nut. Particularly resistant to chloride-free corrosive environments. No surface clinging, so no risk of injury. Facilitates product flow in the case of a chute, for example.
A4 stainless steel square neck round head screws
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