Easy
15-30 minutes
Authentic manufacturer sourced replacement part designed for use with Porter Cable nailers. It is made out of plastic and it is sold individually. This part acts as a cushion when the piston/driver retracts back into the cylinder after being fired. Because this part get so much abuse it has a tendency to crack and fall apart. If the part is damaged or falls out you should replace it.
Piston Stop A03849
OEM part for: Porter Cable
Part Number: A03849
$32.66
In Stock
Order within the next 11 hours and your part ships today! 
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Compatibility
This Piston Stop will fit the following 5 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Displaying 5 of 5 matching models.
Porter Cable
5 total model matches. Try the above search to narrow your results.
This is the official OEM part for the following brands:
- Porter Cable
This item works with the following types of products:
- Nailer
Customer Part Reviews ?
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Easy
Fit perfect
Guest -
December 22, 2022
Verified Purchase
Parts
Very Very good
Guest -
September 10, 2022
Verified Purchase
Back in business!!!!
I’ve used ereplacementparts several times to locate parts for my nail guns and various small engines. Their site is user friendly and I really appreciate the ease in ordering my parts and getting them promptly
Morgan -
February 28, 2022
Verified Purchase
My nail gun works great now
Wasn’t for sure if I had ordered the right piece but I did and it was an easy fix. Works great now
Dwayne -
October 6, 2021
Verified Purchase
Easy
Works as it should
Guest -
May 5, 2021
Verified Purchase
Perfect fit
Great transaction! Quick shipping! Perfect fit! Works great! Thanks
Guest -
April 5, 2021
Verified Purchase
the part fit like a glove
the right replacement part thanks
Guest -
January 14, 2021
Verified Purchase
Part fit perfectly
Part was easy to order and easy to install. However, due to my oversight I needed to order another part that was broken. Once the new part is received, I believe this will fix my problem.
Guest -
November 22, 2019
Verified Purchase
Saved a valuable tool....
If it's leaking air and not firing, this part may save the tool, easy to get into with 4 screws, there were two O rings on it which might be a good idea to replace as well, clean out the head unit a few drops of oil and button it up. Worked perfectly, not sure if they will continue to carry this critical part in the future, hopefully someone ID's the absolute critical parts and keeps making them.
william -
October 28, 2019
Verified Purchase
Easy Fix
This part along with the collar fixed my nail gun in less than 10 minutes so I did not have to buy a new gun
Guest -
July 19, 2019
Verified Purchase
Questions & Answers ?
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Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
Both the collar and piston stop were crack and pieces broken off, allowing air to leak out. There for the nail gun would not operate.
Danny - January 8, 2016
👍 9 of 9 people found this instruction helpful
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, Allen wrench
Parts Used
This was an easy repair, you should down load the parts diagram on ereplacementparts web site, to ensure that all parts are replace in the correct order.
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Framing nailer leaking air at top.
Glenn - January 25, 2017
👍 4 of 4 people found this instruction helpful
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, Allen wrench
Parts Used
I removed the four allen head screws holding the top on. I noticed the piston stop had crumbled.
After replacing the stop the air was still leaking. Did some more research and found out that the piston collar was probably bad. Ordered a new one. Once again removing the top I removed the collar and noticed it was split along the side. After replacing the collar and reassembling the top the air leak was solved. Received my new parts on a very timely basis from ereplacementparts.com This was a very easy fix.
Glenn N.
After replacing the stop the air was still leaking. Did some more research and found out that the piston collar was probably bad. Ordered a new one. Once again removing the top I removed the collar and noticed it was split along the side. After replacing the collar and reassembling the top the air leak was solved. Received my new parts on a very timely basis from ereplacementparts.com This was a very easy fix.
Glenn N.
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Nailer wouldn't shoot nails and was leaking air
Danny - February 28, 2018
👍 3 of 3 people found this instruction helpful
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Allen wrench
Parts Used
1. Placed the nail gun on the bench
2. Removed the large rear back plate (4 allen screws)
3. Pulled stop spring out of backing plate unit
4. Cleaned out the backing unit and gun assembly with compressed air to remove debris
5. Removed and replaced the piston stop cap
6. Re-inserted the stop spring assembly back into the backing plate assembly
7. Re-installed the backing plate unit on the gun (4 screws).
8. Added air-hydraulic oil (drops) into the air intake, connected to air, and tested the unit
2. Removed the large rear back plate (4 allen screws)
3. Pulled stop spring out of backing plate unit
4. Cleaned out the backing unit and gun assembly with compressed air to remove debris
5. Removed and replaced the piston stop cap
6. Re-inserted the stop spring assembly back into the backing plate assembly
7. Re-installed the backing plate unit on the gun (4 screws).
8. Added air-hydraulic oil (drops) into the air intake, connected to air, and tested the unit
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Nailed would not eject the nail
Radesh - December 9, 2015
👍 3 of 3 people found this instruction helpful
Tool Type
Nailer
Difficulty
Easy
Time
30-60 minutes
Tools Used
, Hex wrench
Parts Used
Take the top of the nailer off, then push the stopper down then replace the new one. Make sure there are no broken pieces of the old stop anywhere.
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Air leaked from top cover
Victor - January 27, 2018
👍 1 of 1 people found this instruction helpful
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, Allen Wrenches
1. Went to ereplacement parts site. Watched video. Read probable cause. Disassembled the nailer found the problem as stated on site. Installed parts, works Great!!!!
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Air leak from top
Rick - July 18, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Nailer
Difficulty
Medium
Time
30-60 minutes
Tools Used
Pliers, Allen wrench
Parts Used
Removed top piston cover. Remove damaged piston stop and collar. Clean and re-oil. Install new parts, reinstall piston cover
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Seals failed
MARK - July 5, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Allen wrench
Parts Used
Remove top from nailer and replaced piston stop and one other seal that was ordered.
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Nail gun stopped working
Ron - March 11, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Nailer
Difficulty
Medium
Time
30-60 minutes
Tools Used
Screwdriver, Pliers
Removed the top cap of the nail gun
Remove all of the parts listed
Cleaned out the entire gun
Installed the part and oiled the interior of the gun
Installed the top cap
Shoots nails like it's new
Remove all of the parts listed
Cleaned out the entire gun
Installed the part and oiled the interior of the gun
Installed the top cap
Shoots nails like it's new
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That air was coming out of the exhaust port
Richard - January 9, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Allen wrenches
Parts Used
1. Removed the top housing
2. Found that the 2 Teflon parts had deteriorated.
3. The collar which is visible when you remove the top housing,
4. After removing the cylinder, found the piston stop in bad shape also.
5. Ordered new parts which came in 3 days (very good service!)
6. Replaced the parts in a few minutes
It worked perfect, thanks ereplacement!
2. Found that the 2 Teflon parts had deteriorated.
3. The collar which is visible when you remove the top housing,
4. After removing the cylinder, found the piston stop in bad shape also.
5. Ordered new parts which came in 3 days (very good service!)
6. Replaced the parts in a few minutes
It worked perfect, thanks ereplacement!
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Leaking air
Ernest - December 24, 2022
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, Hex key
Parts Used
Replaced part
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All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
