1.5" - #14 Lag Screw - Hex Head - Slotted Flange Head - Coarse Thread - Grade A-Zinc Coated 1-1/2 in x 1/4 in - Heavy Duty Wood Screw (50): Amazon.com: Industrial & Scientific
10-32 X 1/2 Ultra-Wide Flange Head Socket Screw 18-8 SS USA - AMPG - Shoulder Screws, Shoulder Bolts, Sex Bolts, Flat Washers, Machine Screws and other fasteners