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FN250B Porter Cable Nailer - Overview

Diagrams for FN250B

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Parts for the FN250B

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URETHANE RETAINER – Part Number: 890725
$6.40
In Stock
URETHANE RETAINER
Part #890725
This is a genuine Porter Cable replacement part, it is sold individually. The purpose of the 890725 Retainer is to secure the pins used on the model numbers shown below. It is advised to check the condition of the retainer often, for the reason the do deteriorate over time and can fall off of the pin they are retaining.
O-RING – Part Number: 883848
$6.40
In Stock
O-RING
Part #883848
O-rings are designed to contain thousands of pounds of pressure by creating a seal between two or more parts. O-ring measurements are defined by the inside diameter and the thickness. rnrnThere are many causes for O-Ring failure, such as pressure, friction, temperature or chemicals. The most common are: • Extrusion and Nibbling...Read moreu> - O-ring has ragged, tattered edges. These are commonly caused by pressure spikes which shear off tiny "bites" from the o-ring, or caused by clearance gaps. • Abrasion - One or both sides of the o-ring appear rough and slightly flattened. Commonly caused by a contact surface that is too rough, contains grit or is too smooth to allow lubrication. • Over Compression - O-ring is flattened on both sides and may have a "ring" split along its length. Commonly caused by excessive pressure or heat. • Heat Hardening - O-ring has a pitted or cracked surface, and often is flattened on both sides. Caused by temperature exceeding o-ring capacity. • Weather/Ozone Cracking - O-ring is covered in small surface cracks. Caused by exposure to ozone, UV rays and air pollution. Excessive seal stretching causes similar cracking.
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O-RING – Part Number: 883936
$6.40
In Stock
O-RING
Part #883936
O-rings are designed to contain thousands of pounds of pressure by creating a seal between two or more parts. O-ring measurements are defined by the inside diameter and the thickness. rnrnThere are many causes for O-Ring failure, such as pressure, friction, temperature or chemicals. The most common are: • Extrusion and Nibbling...Read moreu> - O-ring has ragged, tattered edges. These are commonly caused by pressure spikes which shear off tiny "bites" from the o-ring, or caused by clearance gaps. • Abrasion - One or both sides of the o-ring appear rough and slightly flattened. Commonly caused by a contact surface that is too rough, contains grit or is too smooth to allow lubrication. • Over Compression - O-ring is flattened on both sides and may have a "ring" split along its length. Commonly caused by excessive pressure or heat. • Heat Hardening - O-ring has a pitted or cracked surface, and often is flattened on both sides. Caused by temperature exceeding o-ring capacity. • Weather/Ozone Cracking - O-ring is covered in small surface cracks. Caused by exposure to ozone, UV rays and air pollution. Excessive seal stretching causes similar cracking.
Read less
SS/A TRIGGER VALVE K – Part Number: A08368
$69.97
In Stock
SS/A TRIGGER VALVE K
Part #A08368
This unthreaded trigger valve assembly is a genuine OEM assembly used in nailers. It includes the trigger valve, 1 rubber washer, and 3 roll pins. The trigger valve controls the flow of air in the tool which drives the piston and creates the nailing action. If the valve becomes stuck, the seals wear down, or the trigger breaks the nailer will leak air, struggle to fire, or not fire at all. Begin the repair by switching off the tool and using a push pin to remove the trigger. Remove the roll pins that secure the trigger valve and pull the trigger valve out of the housing. Insert the new valve into the housing, install the pins to hold it in place, and secure the stay pin with the washer.
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O-RING – Part Number: 883938
$6.40
In Stock
O-RING
Part #883938
O-rings are designed to contain thousands of pounds of pressure by creating a seal between two or more parts. O-ring measurements are defined by the inside diameter and the thickness. Of the many causes for O-Ring failure, the most common are: • Extrusion and Nibbling - O-ring has ragged, tattered edges. These are commonly caused by pressure spikes which shear off tiny "bites" from the o-ring, or caused by clearance gaps. • Abrasion - One or both sides of the o-ring appear rough and slightly flattened. Commonly caused by a contact surface that is too rough, contains grit or is too smooth to allow lubrication. • Over Compression - O-ring is flattened on both sides and may have a "ring" split along its length. Commonly caused by excessive pressure or heat. • Heat Hardening - O-ring has a pitted or cracked surface, and often is flattened on both sides. Caused by temperature exceeding o-ring capacity. • Weather/Ozone Cracking - O-ring is covered in small surface cracks. Caused by exposure to ozone, UV rays and air pollution. Excessive seal stretching causes similar cracking.
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PIN – Part Number: 897351
$10.05
On Order
PIN
Part #897351
This pin is a part of the trigger assembly in your nailer. It is responsible for controlling the firing mechanism. When the trigger is pulled, the pin activates, releasing a spring-loaded driver that propels the nail forward and drives it into the material you are working on. To check if the pin needs replacement, inspect the trigger assembly for signs of wear, damage, or malfunction. You may notice that the trigger is sticky or unresponsive, and the nailer fails to fire consistently. To replace the pin, start by removing the trigger from the nail gun. The trigger is secured with a pin and a urethane ring, so use a punch to push the pin out. Before installing the new pin, place the spring inside the trigger, ensuring the other end aligns with the trigger valve. Compress the spring while placing the trigger valve back into the housing. Once the trigger valve is in place, insert the replacement pin. Turn the gun over and secure the pin with the urethane ring. Please note that this OEM replacement part is sold individually.
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RETAINING RING – Part Number: 897359
$6.40
In Stock
RETAINING RING
Part #897359
Genuine Porter Cable replacement part, this item is sold individually. This retaining Ring is used in various areas of the Pneumatic Tools listed below. In most cases it is used to secure a pin in place in the tool.
SPRING-RESTRICTIVE T – Part Number: 904701
$6.40
In Stock
SPRING-RESTRICTIVE T
Part #904701
It is an authentic OEM component which is made for Porter Cable nailers. This spring applies tension on the trigger allowing it to retract. If the spring is stretched, damaged or lost, this part will provide an identical replacement for the original hardware that was installed on a new unit. One durable metal spring is included. Replacing it is a simple task that should not require any special tools. Check the appropriate diagrams for your model to ensure the proper repair procedure.
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HEX WRENCH 2.5MM – Part Number: 891903
$6.40
In Stock
HEX WRENCH 2.5MM
Part #891903
This is a genuine OEM sourced replacement wrench which is specially designed for use with power tools. This component allows a user to secure or remove various hex socket head screws, it provides an identical replacement for a missing or damaged wrench which came with the new equipment. It is a high-quality part which is made of durable metal and is sold individually.
PISTON STOP – Part Number: 904685
$36.01
In Stock
PISTON STOP
Part #904685
This piston stop is for nailers. The piston stop provides a cushion for the piston. Wear work gloves to protect your hands when installing this part.
SEAL – Part Number: 904689
$15.87
In Stock
SEAL
Part #904689
Genuine Porter Cable replacement part, this item is sold individually. The Head Valve Seal is in stalled on top of the 904695 Cylinder. It provide a seal for the Head valve. If you air leaks in your nail gun you may consider the part number 904949 Overhaul Kit. It includes the Head Valve Seal and other internal parts to stop air leaks
O-RING (58 X 2.5) – Part Number: 904694
$9.64
In Stock
O-RING (58 X 2.5)
Part #904694
This is an authentic manufacturer-sourced replacement part which is specially designed for Porter Cable nailers. The purpose of this o-ring is to provide an air-tight seal between connected parts, unfortunately, over time the material will wear out and it may begin to crack eventually requiring a replacement to maintain peak performance. Keep in mind this high-quality item is made of durable rubber and is sold individually.
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Manuals & Care Guides for FN250B

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Manual
Owner's Manuals
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Questions And Answers for FN250B

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Sorry, we couldn't find any existing answers that matched.Try using some different or simpler keywords, or submit your new question by using the "Ask a Question" button above!
Chuck - For model number FN250B
July 19, 2022
Is the piston ring a split ring?
Chris Boyle Profile
Hi Chuck, Thank you for your question. Yes, this would be a split ring. If you need help placing an order for it, customer service is open 7 days a week and anyone will be happy to assist you. Please feel free to give us a call. We look forward to hearing from you!
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ANDY - For model number FN250B
December 11, 2023
HOW TO REMOVE THE PISTON STOP
Chris Boyle Profile
Hi Andy, Thank you for writing. Here is a repair story from a previous customer. "I removed the top of the gun by removing the four hex screws. Then the top of the gun comes off and you can take out the piston stop". We hope this helps!
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Grady - For model number FN250B
February 22, 2023
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
Chris Boyle Profile
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.
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Replacing the URETHANE RETAINER

Replacing the URETHANE RETAINER

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Replacing the O-RING

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Replacing the SS/A TRIGGER VALVE K

Replacing the SS/A TRIGGER VALVE K

Replacing the Trigger Valve Assembly (not Th

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