Made in USA - Precision Shoulder Screw: 5/16″ Shoulder Dia, 5/16″ Shoulder Length, 1/4-20, 0.438″ Thread Length, 303 Stainless Steel, Hex Socket - 67314328 - MSC Industrial Supply
1/4-20 X 1/2 Socket Drive Low Profile Shoulder Screw 3/8 X 1/4 Shldr316 SS USA - AMPG - Shoulder Screws, Shoulder Bolts, Sex Bolts, Flat Washers, Machine Screws and other fasteners
M6 (8mm) x 12mm Socket Shoulder Screws (ISO 7379) - 12.9 Hardened Steel: Accu.co.uk: Precision Screws