1/4-28 Stainless Steel Socket Head Cap Screws 18-8 Partial Thread Hex Bulk
Head: Cylindrical socket cap, 3/16″ hex (Allen) drive. Drive: 3/16″ hex key. Drive3/16″ Hex Socket (Allen). These longer lengths carry an unthreaded shoulder under the head for shear strength and clamp load.
5/16-24 18-8 SS Flat Head Socket Cap Screws 82° Countersunk Partial Thread Bulk
Why a Flat Countersunk Head. Sits flush — the 82° countersunk head seats level with the surface for a clean, snag-free finish. Head: 82° flat countersunk, 3/16″ hex (Allen) drive. Length — overall length (countersunk).