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At441 Hss Microstop Countersink
MFR Model# 02-441
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Overview
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AT441 HS Micro Stop Countersink, similar to the AT442SLS unit, except with 1/4-28 female threaded nose to accommodate AT455 cutter. |
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WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. |
Reviews
These work great as always.
Verified Purchase
Microstop Countrsink AT441-HSS
Verified Purchase
Microstop Countrsink AT441-HSS
Don’t waste your time and money on this micro stop. It has a reverse-thread lock nut that jams when you lock it down (by hand) and it will not come loose for resetting even with channel locks and a vice. Don’t know why it does this, but it happens whenever you set the lock nut. Spend the extra money and get the better one.
Verified Purchase
Microstop Countrsink AT441-HSS
Do not use stop nut. Gently unscrew/retract nut out of the way (not really needed) as it could jam. After I did this it worked flawlessly. An amazing tool which set countersink depth easily and consistently. Very nice!
Verified Purchase
Microstop Countrsink AT441-HSS
Verified Purchase
Microstop Countrsink AT441-HSS
The tools are working as advertised.
The first one of these I received immediately seized up at the point at which the lock ring meets the drill side of the cage barrel. I was unable to loosen it, to the point where I fractured the cage with the force of a bar passed through the cage openings. Aircraft Spruce promptly replaced the unit without additional charge, which was great customer service. I applied anti-seize compound to the threads on this second unit. That seems to have solved the problem so far. The unit does a nice job of cutting multiple countersinks to the same depth, but the manufacturer really ought, in my opinion, provide an instruction sheet on how to use and adjust it.
The first one of these I purchased somehow managed to get cross threaded the first time I used it. After a few uses it became so distorted a pneumatic impact wrench couldn’t loosen the collet. I have now purchased a second only because there aren’t many affordable options that ship in timely fashion available. TBD how long it will last.
Verified Purchase
Microstop Countrsink AT441-HSS
Q&A
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.
This has a plastic base and bronze bearings.
Approx 7/8 to 1 per the vendor.
The counter sink threads in using 1/4-20 threads. The only 120 deg countersinks we offer come in a 5 piece set under part number 12-02884. The countersink cutters much be purchased separate from this countersink stop.
