6 x 1-1/2 in. Flat-Head Black, Phillips - Qty:1000

6 x 1-1/2 in. Flat-Head Black, Phillips - Qty:1000

Black screws are a nice finish for both decorative and functional purposes.

The black finish comes from a chemical "conversion coating" for metal, where the surface is subjected to an electrochemical or chemical process, leaving a coating on the metal and converting it into a protective and decorative coating. This process adds a level of mild corrosion resistance, along with the aesthetic or decorative appearance, and minimizes the reflection of light off the surface.

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.

The Phillips Recess remains very popular in the woodworking industry. It provides a much more positive fit than slotted screws and requires about 12 foot-pounds of pressure to keep the driver engaged in the recess. There is also more "cam out" (driver bit slippage) that occurs when compared to square drive screws, which offer a more positive bit engagement. This "cam out" was a part of the design feature to prevent overtightening of the fastener. This was described as a feature in the refinement Patent of 1949.