Medium
30-60 minutes
Genuine Hitachi replacement part, this item is sold individually.
This O-Ring is installed on the plunger of the tools shown below.
It acts as an air seal to prevent an air leak.
Over time O-Rings will be come brittle and stretched.
When this happens it is time to replace this item
It is also time to inspect the other O-Rings in the tool for wear also.
Plunger O-ring 874820
OEM part for: Metabo HPT (Hitachi)
Part Number: 874820
$4.99
In Stock
Ships within 1 business day 
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Product Description ?
- Classification: Part
- Weight: 0.01 lbs.
- Shipping: Ships Worldwide
Frequently Purchased Together ?
Compatibility
This part will fit the following 49 machines
Metabo HPT (Hitachi)
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Show More Compatible Models
This item works with the following types of products:
- Nailer Parts
- Stapler Parts
Customer Part Reviews ?
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perfect fit
Fits well. Great interactive site and easy to find parts. 4 stars instead of 5 because it seems all o-ings are priced at $2.99 no matter what size or function. I say this because O-Rings in a hardware store run around 89 cents. Yes i know size, performance and convenience matter not all orings are the same. How special can these O-rings be. You asked.
Mark -
March 12, 2022
Verified Purchase
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t -
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eReplacementParts Team
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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.
framing nailer was leaking air when connected to air hose
Roger - December 28, 2021
Tool Type
Nailer
Difficulty
Medium
Time
1-2 hours
Tools Used
, allen wrench set, O ring pic, 8mm wrench, hammer, punch.
Dismantled entire gun piston bumper was breaking into small pieces causing air leak. I use my nail guns daily therefore when something like this happens I always do a complete rebuild, in this case the front bumper was also bad. I always allow a few hours thoroughly clean, inspect and rebuild everything properly to extend the time between rebuilds. recommendations: Take your time be patient, drink a beer if necessary and make it like brand new.
P.S. DO NOT REUSE OLD PARTS SUCH AS GASKETS, ROLLED PINS, ETC. CHEERS AND HAVE FUN!
P.S. DO NOT REUSE OLD PARTS SUCH AS GASKETS, ROLLED PINS, ETC. CHEERS AND HAVE FUN!
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air leak at trigger
Bruce - July 15, 2020
Tool Type
Nailer
Difficulty
Medium
Time
30-60 minutes
Tools Used
Screwdriver, punch and small hammer for roll pin
Punched out roll pin holding trigger. Not the right tool but used a hammer and screwdriver to remove the threaded piece holding the trigger apparatus. Replaced the valve packing and both o-rings and reassembled. Be careful no to lose the ball.
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Air was leaking from the trigger.
Calvin - March 16, 2019
Tool Type
Nailer
Difficulty
Easy
Time
30-60 minutes
Tools Used
Screwdriver, Pliers
I removed the trigger assembly and replaced broken parts
Replaced o rings.
Replaced o rings.
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Air leaked from trigger
Michael - August 11, 2017
Tool Type
Nailer
Difficulty
Medium
Time
30-60 minutes
Tools Used
, Allen wrenches, small punch to remove trigger drift pin
1) Drove trigger pin out.
2) Remove trigger assy.
3) Replaced valve packing and urethane ball and plunger o-ring
2) Remove trigger assy.
3) Replaced valve packing and urethane ball and plunger o-ring
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The trigger would no longer worked
Joseph - December 25, 2016
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Pliers, Roll pin punch & brass hammer
I punched out the trigger roll pin with a roll pin punch of the correct diameter
Removed the trigger and plunger assembly after loosening the trigger valve nut with adjustable pliers gripping the outside of the nut since I didn't have a spanner type tool that would fit the slot in the top of the nut
Replaced the urethane ball, trigger plunger and installed the new O-rings and valve packing
Re-installed the plunger assembly and trigger and tapped the roll pin back in place
Put the air hose on the tool and successfully fired about 7 16d nails into a piece of wood
Works like new again
Removed the trigger and plunger assembly after loosening the trigger valve nut with adjustable pliers gripping the outside of the nut since I didn't have a spanner type tool that would fit the slot in the top of the nut
Replaced the urethane ball, trigger plunger and installed the new O-rings and valve packing
Re-installed the plunger assembly and trigger and tapped the roll pin back in place
Put the air hose on the tool and successfully fired about 7 16d nails into a piece of wood
Works like new again
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Thanks for voting and helping fellow customers!
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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.
