Question about Stanley Bostitch 18 Gauge Brad Nailer 1 - 1/4IN - BT125K - 2

1 Answer

Air allways and continually leaks forcably from the top. Bostitch

Hi I have an aquired Bostitch brad nailer, when air is applied, it continually blows out of the top air deflecter. It did have a brad stuck in the front nose piece, but I removed the two screws and released the brad. The plunger has one O-ring on it but looks like a smaller diameter o-ring could fit in the lower groove which is considerably shallower than the other one but had no rubber on it when I dissassembled it from the nailer. Any info on this nailer problem would be greately appreciated.......... Thanks Brian...

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  • spiderx Nov 25, 2008

    thank you PC Tech50 all the extra info is Greatly Appreciated..... I have parts on order... thanks Brian...

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  • Stanley Master
  • 1,378 Answers

This nailgun has several parts to the headvalve that must fit together properly to seal. Go to WWW.toolpartsdirect.com for a diagram of this tool. The part called the diaphragm is source of problem. It has thin vinyl walls that will fold over when you assemble. The piston will not cause the gun to leak, just make sure that piston fits snug into the cylinder. Loose oring on piston will only cause low power or the poston may not retract all the way back up. Some piston/drivers had a plastic ring instead of an oring. The plastic ring had a secondary oring under, however not necessary. You can use rubber or plastic, just make sure that the piston is not too tight or too loose. The piston oring is the only oring in the gun that can be cut to fit. It is like a piston in a car engine. The piston rings have a gap.

Posted on Nov 25, 2008

  • Todd Massey III
    Todd Massey III Feb 14, 2015

    I have a bostich sb-1850bn and the schematic doesnt have a diaphragm listed on it any where. My gun is having this exact problem

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2 Answers

Nailer is shooting air out of trigger, is not releasing brad


Sounds like the head valve. Remove the head cap take out the head valve, clean, re-fit and give it a few drops of air line oil. Then give it a try. Good luck.

Oct 19, 2014 | Stanley Bostitch 18 Gauge Brad Nailer 1 -...

1 Answer

Brad nails crooked in bostitch


Have you inserted the correct Brad Nails? What is the code of brads you have inserted? Is the tool jammed?

Solent Products Air Nailing and Stapling Supplies

Mar 21, 2013 | Stanley Bostitch 18 Gauge Brad Nailer 1 -...

1 Answer

Air is leaking from somewhere around the trigger and the nailer will not fire...the gun is only about 3 months old


I would take it back for warranty repair if it is that new. If not I have detailed instructions on how to remove the trigger valve assembly from the tool. If it is leaking air it is probably a split o ring on the valve.

Jun 02, 2011 | Stanley Bostitch 18 Gauge Brad Nailer 1 -...

1 Answer

New model sb-1850bn will not operate at all. Oiled it lightly before trying to use. Air comes out around trigger.


If the air is coming out of the trigger when you try to drive a nail, most likely the driver is broken.
Bostitch nailer have a 7 year warranty on them so, take it to a Bostitch service center and have it repaired there.

Dec 16, 2010 | Stanley Bostitch 18 Gauge Brad Nailer 1 -...

2 Answers

My Brad sudddenly stopped working. Makes a Psft


If you've not already tried applying air motor oil to the gun than you should do this first. If this does not solve your problem than it's very possible that your main diaphram is worn or poruse. Thank you, Dana

Mar 31, 2010 | Stanley Bostitch 18 Gauge Brad Nailer 1 -...

1 Answer

Brand new brad nailer shoots 2 nails and then it blows air


first make sure that you are using the right guage nails and if so I would return it to the place of purchase for replacement., the blowing of air could indicate a jammed nail in the track, look for that first and make sure the driver is retracting fully.

Dec 18, 2009 | Stanley Bostitch 18 Gauge Brad Nailer 1 -...

1 Answer

18 ga. Bostitch nailer that has a small brad jammed in it.


check your hex wrenches they could be standard when they need to be metric.

Sep 23, 2009 | Stanley Bostitch 18 Gauge Brad Nailer 1 -...

1 Answer

I dropped my bostitch brad nailer and it won't hold air, I took the end off and a washer fell out and I can't see where it goes, but the compresser keeps going and going and won't shut off, I can feel air...


Go to Stanleybostitch.com and type in your model number for a breakdown and parts list. If you want give me the exact model number and I will do more research for you.

Sep 20, 2009 | Stanley Bostitch 18 Gauge Brad Nailer 1 -...

3 Answers

Nails won't shoot


18 guage nailer has a very thin driver and plastic cylinder which bends or breaks easily. Remove the head noting all the parts in the head and remove the piston which should be at the top of the cylinder. Check for broken or bent shaft. Most likely broken and jammed in cylinder. Parts are not expensive. Check WWW.toolpartsdirect.com for diagram and parts

Nov 17, 2008 | Stanley Bostitch 18 Gauge Brad Nailer 1 -...

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