Captive Screw 4-40 Thread
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D Diameter: .320 (8.2), Drive: Knurled, Hardware: NO, Length: .781 [19.9], Material: Stainless Steel, Style: Captive Screw, Thread: 4-40, Type: Thumb Screw, Knurled Slotted Head-Style 1
https://www.keyelco.com/product.cfm/8701/id/product_id/539
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