Question about Stanley Bostitch MIIIFN Flooring Nailers

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The staples don't go in far enough

I have used this pnuematic before when I installed cherry wood in another room a few years ago. This time I can't seem to get the staples to go in far enough to fit the next board in. I have tried adjusting the psi and that does't seem to make a difference. Any solutions?

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Either the pioston backed off piston stem or the blade is broken. remove 4 bolts holding shoe to yellow body. remove magazine and shoe. remove yellow bumper inside gun. Pull piston down and inspect blade. if not broken see if piston backed off stem. if so gun must be rebuilt and part # BC347 must be replaced. visit www.bostitch.com and download schematic and where parts can be obtained.

Posted on Feb 14, 2009

  • Kevin O'Leary Feb 16, 2009

    Any luck on this repair?

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1 Answer

How to adjust depth on bostich mk111fs


There is no depth adjustment on this tool -
If the staples are going too deep - most likely the piston (#17) has threaded off the driver inside the tool, you have a broken piston bumper (#62) inside, or the teflon foot pad (#56) on the bottom of the tool is the wrong thickness for the flooring you are using.
If the staples are not driving far enough - most likely you have a broken / chipped driver blade (#21) or the teflon foot pad (#56) on the bottom of the tool is the wrong thickness for the flooring you are using.


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Most likely the piston (#15) has partially unthreaded from the piston stem (#17) - this requires a complete teardown to rectify. Sometimes it is simply because use has caused it to loosen - it can also be because the piston has stripped.
Also check your bumper - if it is worn, or in pieces the driver will overdrive.

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1 Answer

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Air pressure. (Use manufacturer's recommended)

Nice smooth swing of the mallet.

Hose length NOT too long.(friction of air in hose can reduce the flow)

Proper amount of lube oil used.

Correct sole plate for the thickness of wood.

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1 Answer

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D Farley,
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1 Answer

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Jason,

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I did find that if I put all the down pressure on the stapler right on the edge where the staple comes out and then pull the trigger it would drive the staple almost all the way in. I think that there is a recoil effect (like with a gun) when you pull the trigger and the staple enters the wood. Try this. it will help.


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