4 x 3/8 in. Pan Head, Black, Square - Qty:100

4 x 3/8 in. Pan Head, Black, Square - Qty:100

Pan Head Square Drive screws are flat under the head to provide maximum bearing area.

Use them when you don't want the screw head to sink into the wood.

Pan head is a common head type of a non-countersunk wood screw head, self-tapping, self-drilling, and machine screws.

They get their name because the head shape looks like an upside down frying pan. They wide head has a flat load bearing surface, curved or chamfered vertical sides and a slightly domed top surface with a recessed socket. Pan Head Screws provide a flat bearing surface under the head which is useful for attaching adjustable cabinet hardware such as drawer slides and hinges.

In 1908, P. L. Robertson began to manufacture a square recess impression in the head of a screw in Milton, Ontario, Canada. He was a brilliant toolmaker that injured his hand while driving a slotted screw and started developing a better recess. At that time, it was a revolutionary change in the fastener industry. It has a more positive fit that reduces "cam out" and requires only 4 foot pounds of pressure to keep the bit engaged.

The silver appearance of Clear Zinc has been around for many years and remains very popular. It also provides a moderate level of rust protection. Since this is a true electroplating, the zinc coating is part of the surface of the steel and very durable.

Deep Thread: Characterized by a reduced diameter shank resulting in a deep thread profile. A single lead thread, meaning that one revolution advances the screw one pitch. (Pitch is equal to 1 divided by the number of threads per inch. For a screw with 10 threads per in., one revolution will advance the screw 1/1O in. into the wood.)

The deep thread form provides superior resistance to pull-out. This design feature is commonly called a Lo-Root® or Production Screw.