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
  • 1,383 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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I have already changed trigger valve assembly, O rings and all. Still leaks when I try to fire. Will not shoot brads just leaks lots of air around trigger assembly.


Most likely problem is the head valve orings not making perfect seal. Remove the head and pull out the headvalve piston. Apply plenty of white grease to orings and test fire. If gun fires, will need oring kit soon. Good luck

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Most likely the orings or seals in the headvalve are not making perfect seal. Remove the head and pull out the headvalve. Apply plenty of white grease to orings and test again. If the gun fires, then will need oring kit soon, or just keep using plenty of grease. If the gun still does not fire, check that the safety foot is depressing the trigger valve all the way in. Good luck

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Sounds like the trigger valve is bad. If the air is leaking out of the trigger you can buy a kit and replace it. Try eReplacementParts com or your local Bostitch service store. It's really simple to change, check out this site for step by step, How To Replace The Trigger Valve On Bostich Nail Gun How To Guides DIY... OEM Replacement Parts DIY Repair

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