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.
Plain or non-plated screws can have a variation in appearance that occurs at the time of heat-treating. The appearance can vary from a silver-gray steel look to a bronze look. This variation in appearance has no effect on the performance of the screw.
Our Unplated Dry Lube finish is a dry to the touch lubricant that offers a reduction in driving torque and a finish that does not interfere with dust collection systems or bleed during the staining process of fine woodworking. McFeely's offers a wide variety in Unplated Dry Lube or "lube" finish. More economical than plated parts they are a popular choice with professional woodworkers. They are a brownish color that allows them to blend well into wood.
Square-Phillips Recess or Combo Drive offers the positive fit of Square/ Robertson® recess with the after-market serviceability of Phillips drive. A square bit is used to insert the screw and a Phillips driver can be used to remove the screw at the after-market level. Like the square drive, the Combo drive requires a minimum amount of pressure (appx. 4.5 foot pounds) to keep the bit engaged in the head. This reduces the possibility of carpal-tunnel syndrome for workers that drive screws all clay long on a production line.
|SIZE (#8, #10 ...)||#6|
|COUNTERSINK NIBS||Without Nibs|
|RECESS TYPE||Combo - Square/Phillips|
|POINT TYPE||Standard Wood|
|Head Diameter||17/64 in.|
|Unthreaded Shank Diameter||7/64 in.|