Question about Makita AF503 2'' 18 - Gauge Brad Nailer

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My af503 no longer sets nails in enough oiled daily probably fired 2000 brads. No depth setting I can find

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SOURCE: Makita AF503 Brad Nailer won't fire nail

Take head off of tool. Clean and lube orings on the head valve . Do not use wd40 use air nailer oil.

Posted on Apr 14, 2009

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SOURCE: porter cable brad nailer only fires brad on second trigger pull

The dent in the wood is not caused by the air. It's caused by the set that drives the brad. Are you oiling it consistenly? Are the brads the right manufacturer for your porter cable brad nailer? From the information you give it appears that the brads are not advancing correctly or that the air pressure is not sufficient to dislodge the brad from the brad strip on the first strike - it takes an additional strike to break it free. The standard for adding oil is to add ten drops of air tool oil for every hour of operation. That seems like a lot, but the correct amount of oil is a sure way to prevent most air tool problems.

Posted on Aug 29, 2009

Testimonial: "Thanks for the info. I was not oiling it at that rate. Is there anything I can do to fix the issue now that I didn't prevent it?"

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I have three nailers from CH and all of them sound like there is not enough pressure to fire the nail when i depress the trigger. i hear air escape, but it is at a reduced level compared to normal...


Check and adjust the air pressure at the compressor. All air tools have a recommended range of pressure, and you may not have enough air for the tool to work. Also, place two drops of pneumatic oil or light machine oil into the air inlet at the nailer, and then connect the hose. Fire the gun several times into scrap wood. Oil with 2 drops daily.
Best regards, --W/D--

Mar 06, 2011 | Campbell Hausfeld Air Brad...

2 Answers

Brad nail only goes 1/2" into wood. there is no


You might get better penetration if you use your other hand to press the gun down firmly onto the surface before you pull the trigger. (This will help if the gun tends to jump a little when you fire it.) Or, if the surface you are firing into might not be rigid enough (like a thin board that is not supported) - in that case you might improve the penetration by better supporting the surface you are nailing into, perhaps by placing it on the floor. On the other hand, this may simply be a case that the gun is not powerful enough to do what you want it to do. To test that theory, try it into a piece of soft wood (like a 2X4) or find a soft thick material as a first layer over the wood you are using. Perhaps you can use shorter nails - thin brads in wood don't gain much strength beyond 1/2 inch penetration anyway. The length of the brad only needs to be about 1/2 inch longer than the thickness of the first layer of material. I hope this helps, good luck Al K

Feb 24, 2011 | Arrow ET200 Electric Brad Nail Gun

1 Answer

Bn125a nailer not sinking nails all the way


The depth to which a fastener is driven is controlled by the depth adjustment

knob (A) Fig. 19 below. The depth of drive is factory adjusted to a nomimal setting.

Test fire a fastener and check depth. If

a change is desired, rotate the

adjustment knob (A) Fig. 19: the

adjustment knob has detents every 1/4

turn. Rotate the knob clockwise (see

Fig. 19), to increase the depth of drive,

rotate the knob counterclockwise to

decrease the depth of drive. Test fire

another fastener and check depth.

Repeat as necessary to achieve

desired results. The amount of air pressure required will vary depending on the

size of the fastener and the material being fastened. Experiment with the air

pressure setting to determine the lowest setting that will consistently perform

the job at hand. Air pressure in excess of that required can cause premature
wear and/or damage to the tool.


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Good Luck

Nov 26, 2010 | Porter Cable Cable BN125A Factory -...

1 Answer

I have a Porter Cable brad nailer BN125A, at 125 PSI and depth adjustement turned to the deepest drive setting, the brad does not set flush with the surface. Problem?


A brad nailer in good working order, set to the deepest setting and using 125psi should almost shoot the brad through the wood. If you have been oiling the gun properly (three to four drops at he beginning of your work session and again in the afternoon if under constant use) then you probably have some worn o-rings inside the gun. Porter Cable makes a driver maintenance kit (PN1001 60062) for your gun that will make it work like new.

Oct 04, 2010 | Porter Cable 18 - Gauge Brad Nailer and...

1 Answer

The gun will fire staples, nails do not set.


Shoots staples fine but brads jam or bend. Check that the part called "guide bar", #35 on the parts diagram isn't getting stuck in the channel of part #30.

The guide bar retracts into the channel when driving a staple and springs out of the channel to guide brads.

The guide bar can get stuck in the channel if it's bent or gummed up. (Bent is likely the result of driving a brad into an obstruction.)

The business end should look like this:

37b60e82-3010-4c4e-9065-d56a1df32d57.jpg

Mar 07, 2010 | Stanley Bostitch Sb 2IN1 2 In 1 Narrow...

1 Answer

Nail gun not firing nail


THe most likely causes of this are not enough air pressure (90 psi) or a nail is jammed in the front, causing the striker to stick down. Also, if it hasn't been oiled in a long time, that could cause it.

Nov 16, 2009 | Dewalt Heavy Duty 2 Brad Nailer Compressor...

1 Answer

Porter cable brad nailer only fires brad on second trigger pull


The dent in the wood is not caused by the air. It's caused by the set that drives the brad. Are you oiling it consistenly? Are the brads the right manufacturer for your porter cable brad nailer? From the information you give it appears that the brads are not advancing correctly or that the air pressure is not sufficient to dislodge the brad from the brad strip on the first strike - it takes an additional strike to break it free. The standard for adding oil is to add ten drops of air tool oil for every hour of operation. That seems like a lot, but the correct amount of oil is a sure way to prevent most air tool problems.

Aug 29, 2009 | Makita AF503 2'' 18 - Gauge Brad Nailer

1 Answer

Bostitch nail gun loss of pressure, won't fire nail


Hello. I can help you. The nail gun you have uses 18 gauge brads. I would use only original Bostitch 18 gauge.

The one MM of difference you mention is the reason why you do not have the pressure you did have. Get rid of those 31MM brads and get the 18 gauge. Home Depot carries the Bostitch line. I would go there or to homedepot.com

May 20, 2009 | Stanley Bostitch BT200K

1 Answer

Makita AF503 Brad Nailer won't fire nail


Take head off of tool. Clean and lube orings on the head valve . Do not use wd40 use air nailer oil.

Apr 11, 2009 | Makita AF503 2'' 18 - Gauge Brad Nailer

2 Answers

Porter Cable BN125A won't set nails below surface


Not sure about the seal, but I do know the pressure has to stay up for this nailer to be effective. Try oiling the gun to free up the mechanics and don't use old nails.

Jan 23, 2009 | Porter Cable Cable BN125A Factory -...

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