7 x 1-1/2 in. PocketMax Screw Coarse Dry-Lube Qty:6000

7 x 1-1/2-inch PocketMax Screw Coarse Dry-Lube Qty-6000

Specially designed for Pocket Hole Construction, these screws combine the load bearing of the pocket-hole filister head, the self-drilling auger point, and hardened sharp threads for strength.

PocketMax Screws Prevent Joint Separation!

With proper pre-drilled depth, Pocket-Max screws will not cross thread the two pieces being joined. Cross threading can cause the two pieces to separate forming a poor joint. PocketMax screws are designed so that the unthreaded portion of the screw's shank spans between the pieces being joined.

The Type 17 point is not a thread style but can enhance the performance qualities of most thread styles used in the woodworking industry. A slot or notch is cut out at the point of the screw that acts like an auger or drilling tip. The slot carves away the material thus allowing it to self-drill itself into most types of wood. In many instances it can eliminate the need for a pre-drilled hold to relieve splitting. The Type 17 point is excellent for hardwoods, softwoods, particleboard and especially MDF.

Developed in a high production woodworking shop, PocketMax screws combine self-drilling points, deep sharp threads, and heat-treated hardening which provides excellent performance in both hard and soft woods.

Square Drive Recess: This recess was invented by P.L. Robertson (founder of Robertson, Inc.) in 1908 and was the first production fastener with an internal recess.

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. An early attempt to introduce these Square Recess Screws into the United States failed so they were confined to the Canadian Market until the 1970s. The Phillips Head was introduced in the 1930s and would "cam out" instead of being over torqued by the new power drivers of the time. Henry Ford tried out Square Drive and found them to save time in the production of the Model T. Ford wanted to License the Square Drive and when Robertson refused, Ford went with the Phillips and allowed the Square Drive to be used in Ford's Canadian Production. For the auto industry that was fine where woodworkers work concerned about the finished look of their product. Eventually, the Robertson Recess screws migrated across the border making their place in the furniture and woodworking trades, especially with the growing popularity of pocket hole joinery. A new hybrid is the combination of the Square-Phillips, Combo or Recex Recess that you can use either or Square/Philips bits. The first patent was issued in 1909 and the last patent expired 55 years later in 1964. For his invention, P.L. Robertson screws and screwdrivers carry his name to this day.

1.The Evolution of the Screw and Screwdriver

FEATURES:

• A Type 17 self-drilling auger point.
• Unthreaded shank length designed to prevent cross threading which can cause separation of the pieces being joined.
• #2 true Robertson® Square Drive for non-slip bit engagement.

Use a clutch equipped drill to avoid the disaster of over tightening.