Mr. Chapman's Tool Tips


    1. Each Chapman bit is designed for use within a specific torque range. Small bits are designed for less torque, large bits are designed for more torque. Chapman tools and bits are specifically engineered for hand use. 

    2. Chapman bits are tough and springy, not brittle. We use fine alloy steel heat treated with a black oxide finish. Each bit reaches its specified hardness that is not too hard to shatter or too soft to twist. 

    3. Our smaller bits, CMS-3,4 & CM-88, 89, 90, etc are designed to prevent damage in applications where the screw is more valuable than the bit. When excess torque is applied, our bits are designed to break before marring an irreplaceable screw. If a screw is seated so tightly that the bit starts to bend, stop immediately, additional force will break the bit, mar the piece or rip off the screw head.


    4. Our famous Chapman Midget Ratchet provides approximately 4 times the leverage of a large screw driver. The ratchet provides more torque than small screws are designed for, so use gentle but even pressure to loosen small screws. A small size bit can be twisted if sufficient force is applied. Use the knurled ends of our bits or the spinner top to apply finger pressure. 

        Handy Firearm Info

          Occasionally we receive inquiries about the torque ranges of our smallest slotted bits, #88, #89 and #90, and our smallest Torx bits T8 & T10. Some customers break or strip bits when working on their firearms and particularly scope rings. There are three components involved, threadlockers, our tool torque ranges and screw fitting.

           Many gun manufacturers and gunsmiths use Loctite Blue 242 threadlocker on firearms to prevent screws from backing out due to recoil or vibration. Loctite Blue 242 is only meant for fasteners 1/4" to 3/4". The correct Loctite to use on fasteners smaller than 1/4" is Green Loctite 290, which is meant for fasteners 1/12" to 1/2". Most firearms do not have fasteners larger than 1/4" yet most gunsmithing literature references the incorrect Blue 242 loctite. More information on loctite 

           Our smaller bits including the previously mentioned are designed to prevent damage in applications where the screw is more valuable than the bit. When excess torque is applied, our bits are designed to break before marring an irreplaceable screw. If a screw is seated tightly (often with Loctite or varnish) that bit starts to bend, stop immediately as additional force will break the bit or marr the screw.

           Since our bits are made to specific tolerances, they must be used in the correct size screw. The working end of the bit must bottom into the screw slot and the length and width must fit snugly. That is why we offer 12 different width and thickness slotted bits!

           Lastly, many gun screws are designed and treated to never back out, so removing them with any screwdriver is futile and they need to be heated or drilled out. If a bit breaks, we have open stock parts at reasonable prices

         

         

        Chapman tools are guaranteed to be as represented and free of defects caused by either defective materials or faulty workmanship. This GUARANTEE does not cover products that are improperly used, abused, or altered. Warranty items must be returned to us for inspection.