4-40 x 5/16 Socket Set Screw Cup Point 18-8 (A2) Stainless Steel
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4-40 x 5/16 Socket Set Screw Cup Point 18-8 (A2) Stainless Steel . A headless screw threaded the entire length. It has a hexagonal drive at one end and a cup-shaped indentation at the other end. The cup point is the most used style set screw. Designed for fast, permanent and semi-permanent location of parts on shafts with hardness differential of 10-15 Rockwell C points and where cutting in of cup edge on the shaft is acceptable. Stainless Steel 18-8 (A2).