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Cutting Tools:  Drills, Countersinks, Spotfacers

These pages show you the part numbers for our cutting tools and provide references back to the pages where you will find the matching metal stitching products.  (Pricing is being updated.)   

If you have arrived at this page and you are confused, here are some pages you can explore that should help explain our process and products:  Metal Stitching, Products.  If you still have questions, you can always pick up the phone and call 800-736-8261 or 209-632-2345 or send us an email.

(If you are from outside the US, please contact us.  We ship direct to the US but have stocking distributors in other countries.)

On this page:  Drills, Countersinks, Spotfacers
On another page:  Taps

Drill Bits for Pins

Drill Bits for Locks

Countersinks for L Series

Spotfacers for C Series

L Series Taps

C Series Taps

Drill Bits for pins:    
 We offer two types of drill bits:  Tough Duty and AccuSize™

Tough Duty drill bits are made of high quality tool steel and are heat-treated to higher hardness.  These drill bits will hold an edge longer and will stand up to harder material.  Use our Tough Duty drill bits if your standard bits have difficulty drilling and staying sharp in your applications.

AccuSize™ drill bits prevent oversizing and egg-shaping drilled holes.  Having a good, round and accurate-sized hole is essential to making a good repair.  Standard drill bits usually drill oversized and out-of-round holes when drilled by hand.  AccuSize™ drill bits stay sharp longer and drill cast iron faster than any other split point high-speed steel drill bit.  AccuSize™ drill bits are patent pending.

Reference pages for more information:  Stitching Pins

A countersink is optional for L Series stitching pins.  Countersinks are used to cut a small tapered recess into the surface of the casting in order to assure that the tapered shoulder of the L Series stitching pin will seat into the surface.  Common applications are on exhaust seats and other machined surfaces.  Use a slow speed drill with all countersinks to improve life of the cutting edges.

A spotfacer is required for all C Series pins installed into through holes.  Spotfacers cut a recess into the surface of the casting to accept part of the shoulder of the C Series stitching pins.  Some of the shoulder must remain below the surface after it is ground or machined flat.  The shoulder is what holds the Spiralhook™ threads tight.  Spotfacers cut an angle into the surface that matches the negative angle under the shoulder of the corresponding pin.  This creates additional holding power.  Approximately 50% of the shoulder should be below the surface whenever possible.  However, in very thin material keep the spotface shallow to leave as much room for threads as possible.  Approximately 0.020"  should serve as a minimum for spotface depth.  If an invisible repair is not an issue, you can leave approximately 50% of the shoulder protruding above the surface of the completed repair for additional strength.  Use a slow speed drill with all spotfacers to improve life of the cutting edges.  (Note:  C Series pins can be installed into blind holes without embedding the shoulder into the surface.  When the pin hits the bottom of a blind hole, the threads are locked into place.)

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Copyright © 1998 LOCK-N-STITCH Inc.
Last modified: October 19, 2006