1/4-20 x 2 1/2 MS51957-B Phil Pan M/S Coarse Full Thread 300 Series S/S DFAR Black Ox 1WG It is a prevailing torque

It is a prevailing torque type nut that is designed to resist loosening due to vibration

and the split washer helps to grip the screw or bolt and prevent it from turning

this screw is perfect for roofing

The 5/16-12 x 1/2 Indented Hex Unslotted Self Tapping Screw Type AB Fully Threaded Zinc is a versatile and durable fastener designed for a wide range of applications

1/4-20 x 2 1/2 MS51957-B Phil Pan M/S Coarse Full Thread 300 Series S/S DFAR Black Ox 1WG It is a prevailing torqueThe 1 4 20 x 2 1 2 MS51957 B Phil Pan M S Coarse Full Thread 300 Series S S DFAR Black Ox is a high quality, durable screw that is perfect for a variety of applications. It is made of 300 series stainless steel, which is resistant to corrosion and rust. The screw has a black oxide finish, which gives it a sleek, professional look. The pan head design provides a low profile, and the coarse threads provide a secure hold. This screw is perfect for use in