Easy
15-30 minutes
It is a genuine item that is supplied by the original equipment manufacturer for use Porter Cable nailers. This is an identical replacement for a missing or a worn o-ring was installed on a new unit, please make sure to refer to the appropriate diagrams of your model for the correct location and application of this hardware. The part helps to provide a tight seal between connected components. Keep in mind this high-quality o-ring is made of durable rubber and is sold individually.
O-ring 904686
OEM part for: Porter Cable
Part Number: 904686
$5.57
In Stock
Ships within 1 business day 
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Frequently Purchased Together ?
Compatibility
This part will fit the following 3 machines
Porter Cable
FN250B 16 Gauge Finish Nailer View Diagrams & Manuals
FN251 (Type 1) Flooring Nailer View Diagrams & Manuals
FN250B (Type 1) Finish Nailer Power Tool View Diagrams & Manuals
This item works with the following types of products:
- Nailer Parts
Customer Part Reviews ?
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O rings
Quick ship, correct part, easy fix
Guest -
April 7, 2021
Verified Purchase
Fast shipping
Web site easy to navigate and easy to find the parts I needed. Parts shipped and arrived quicker than expected. Good job!!
Guest -
January 20, 2021
Verified Purchase
The right parts quickly shipped.
Had an accurate diagram of the tool to help identify the parts. Was able to repair the nail gun at an affordable price.
Guest -
December 9, 2020
Verified Purchase
Easy repair
Just what my nail gun needed. Thank you!
Guest -
November 18, 2020
Verified Purchase
Easy ordering process
Arrived as expected. Easy ordering process.
Guest -
October 10, 2020
Verified Purchase
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Verified Purchase
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Questions & Answers ?
Our customer Service team is at the ready daily to answer your part and product questions.
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We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
Does this fit my product?Questions & Answers for O-ring
What are the dimensions of this part? the o-ring i need is 1 1/2 to 1 5/8 across. is this the right part? o-ring-883837 or 904686
Grady
for model number fn250b
asked on 2023-02-22
Hello Grady, Thank you for your inquiry. According to the one inch grid of squares behind the part, we show that this o-ring 904686 is approximately 1 1/4 inches in diameter. Part number 883837 is showing as 2 inches in diameter according to the one inch grid of squares behind the part. Please advise where the o-ring you are looking for is located and we would be happy to verify the correct part number for you. We look forward to hearing from you.
eReplacementParts Team February 22, 2023
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.
Finish nailer air leak (from top)
Daniel - February 25, 2018
👍 2 of 2 people found this instruction helpful
Tool Type
Nailer
Difficulty
Medium
Time
15-30 minutes
Tools Used
Wrench Set
Parts Used
Removed cylinder housing, then removed piston
Replaced piston cap (vinyl) and all O-rings; applied thin veneer of machine oil to ensure good seal, carefully re-threaded plunger shaft, spring, and piston, then tightened housing bolts
Replaced piston cap (vinyl) and all O-rings; applied thin veneer of machine oil to ensure good seal, carefully re-threaded plunger shaft, spring, and piston, then tightened housing bolts
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Piston not returning. Air leaking from top of cylinder.
John - March 23, 2020
Tool Type
Nailer
Difficulty
Medium
Time
1-2 hours
Tools Used
Screwdriver, Pliers, Torx Driver
Parts Used
When head was removed I found broken plastic parts. Ultimately I ended up replacing O rings, all cylinder head valve plastic parts and the piston ring (although that was probably not really necessary). Biggest problem was the poor quality of the Porter Cable exploded parts diagram and the difficulty in identifying which parts to order. The FN250B is now back together and works perfectly.
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Older unit,, needed rebuild
Steve - April 27, 2018
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Allen wrench
Removed old components,,,
installed the recommended parts,,
I would recommend ereplacementparts ,,, good experience !!!
installed the recommended parts,,
I would recommend ereplacementparts ,,, good experience !!!
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Won't fire.
fred - April 3, 2018
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Parts Used
Took apart and replaced the parts. Reassembled and tested.
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Piston would not return. Just blew air
Britton - February 13, 2018
Tool Type
Nailer
Difficulty
Medium
Time
15-30 minutes
Tools Used
, Allen wrench
The parts I replaced where destroyed, so I looked at the parts list and figured how to put in the new parts I had ordered. Easy Peasy
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Air leak at top.
Aldo - October 15, 2017
Tool Type
Nailer
Difficulty
Medium
Time
30-60 minutes
Tools Used
Wrench Set
Took top off
Removed damaged parts
Replaced damaged parts
Put head back on.
Tested.
Removed damaged parts
Replaced damaged parts
Put head back on.
Tested.
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Nail Gun loosing air from top of housing.
Milton - August 17, 2017
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
, Allen wrench
1. Remove the four bolts in the top of the head unit.
2. Replace the parts inside in the same order they came out.
3. Replace top cap.
4. You can refer to the parts diagram on eReplacement’s website for your exact model.
2. Replace the parts inside in the same order they came out.
3. Replace top cap.
4. You can refer to the parts diagram on eReplacement’s website for your exact model.
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Leaking air out of the top.
Steven - May 19, 2017
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Allen wrench
Installed worn/broken parts as required. Diagnostic tool the web site was very helpful.
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Air leak in piston compression/stop head assembly
Mike - July 1, 2016
Tool Type
Nailer
Difficulty
Easy
Time
30-60 minutes
Tools Used
Screwdriver, Pliers, Allen wrench
1. Removed hex bolts from head
2. Dissembled piston stop and compression assembly
3. Laid all components in order on work bench
4. Utilized individual parts breakdown diagram to validate component assembly
5. Removed and replaced damaged and worn parts
6. Re-assembled components in correct order
7. Installed head hex bolts
8. Oiled and tested tool
9. No air leaks
10. Tool is back in service
2. Dissembled piston stop and compression assembly
3. Laid all components in order on work bench
4. Utilized individual parts breakdown diagram to validate component assembly
5. Removed and replaced damaged and worn parts
6. Re-assembled components in correct order
7. Installed head hex bolts
8. Oiled and tested tool
9. No air leaks
10. Tool is back in service
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Thanks for voting and helping fellow customers!
OEM stands for Original Equipment Manufacturer and means the part you’re buying is sourced directly from the manufacturer who made your product. At eReplacementParts, we sell only genuine OEM parts, guaranteeing the part you’re purchasing is of better design and of higher quality than aftermarket parts.
Our product descriptions are a combination of data sourced directly from the manufacturers who made your product as well as content researched and curated by our content & customer service teams. This content is edited and reviewed internally before being made public to customers.
Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
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.
