Space, every inch of it, is at a premium in aircraft design as shape and weight are critical to function. Also, airplanes are riveted together which requires thousands of holes to be drilled in difficult locations without scratching or marring the work surface. So, engineers needed to design a versatile "chuck-less" drill attachment that could reach into very confined areas.
The answer was found in putting threads on the shanks of drill bits. The benefits are significant. Threaded shank drill bits eliminate the need for a chucking mechanism. Freed of this restriction, it is possible to do a wide variety of jobs in places with extreme space limitations (less than 1" x 2"). Chuck slippage is all but eliminated while the precision mating angle between a threaded shank drill bit and drive spindle ensures concentricity. Drill bit change times are reduced, an exact working drill bit length is insured and the chance of marring or scratching the work surface is greatly reduced.
DLX TIGHT FIT DRILL KIT
I bought one of these to remove broken bolts from cylinder heads at exhaust manifolds , works awesome, Ive had it for years and snap-on stopped selling them. I was happy to find this set on the internet!! I needed more bits but this kit has a lot more accessories so I bought the whole kit and more bits.
This is just what I needed to get a task done. However the threads on the bit that I needed came stripped out from the factory (case was still wrapped in plastic) and I couldnt use it. Good thing I had purchased a spare bit! A quick call to Spruce and they added one to my back ordered parts order. Great customer service!
A very cheaply built tool , but seems to work ok.
spend more money I am returning it cheap chinese crap, Maybe the only thing built in the US is the built in the US sticker
DLX TIGHT FIT DRILL KIT
Total crap. Lasted about 1 hour. I looked on the box and is did not say where it was made... I expect CHINA. For drilling a #40 hole might be ok for a while. Anything bigger buy AMERICAN !!
Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.
We are unsure what is meant by normal screw guns, 12-11215, but this unit will attach to any hand drill with a straight chuck.
No, the Deluxe Tight Fit Drill Kit only accepts 1/4 X 28.
Yes, the "IN THE BOX" tab lists the bits this kit includes.