The interlock between the tabs of the take-up washer and the threads under the head of the SDWF prevent the screw from sliding back under load

5 x 150 Hex Cap Screw 8

1/4-28 x 3 Grade 8 Hex Cap Screw Plain Domestic USA (750)

For diameters under 1 ½ inches

1/4 x 6 Simpson Strong-Drive® SDS Heavy-Duty Connector Screw Double-Barrier Coating - Pack (10) 1 1/4-7 A307A Hex Bolts Plain Steel The interlock between the tabs1 4 x 6 Simpson Strong Drive SDS Heavy Duty Connector Screw Double Barrier Coating Pack (10) . A 1? 4" diameter high strength structural wood screw ideal for various connector installations as well as wood to wood applications. Features: Patented 4 CUT point (coated version) and type 17 point (stainless version) enable easy driving with no pre drilling and minimal splitting Available with a double barrier coating and Type 316 stainless steel 3? 8" hex