Easy
15-30 minutes
An authentic OEM supplied replacement part that is produced for Hitachi nailers. It is a high quality o-ring that provide an air-tight seal for the cylinder so it can build pressure. Over time it may wear out and crack eventually requiring replacement. Periodically check on the condition of seals and o-rings, replace them as needed to maintain peak performance. This o-ring is made from durable rubber material and it is sold individually.
Cylinder O-ring (i.d 63.9) 890444
OEM part for: Metabo HPT (Hitachi)
Part Number: 890444
$4.99
In Stock
Ships within 1 business day 
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Compatibility
This Cylinder O-ring (i.d 63.9) will fit the following 32 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Metabo HPT (Hitachi)
Show More Compatible ModelsThis item works with the following types of products:
- Nailer Parts
This part replaces obsolete part #: 877315, 877-315
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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.
Nailer wouldn't fire
Adam - September 26, 2019
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Pliers, allen wrench
After disassembly & inspection needed a new piston bumper. Need to remove the entire front nose of the gun including the nail magazine. Once the nose piece is removed the bumper just fits right inside and re-assemble in reverse order
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leaks air at top and double fire
wayne - July 29, 2019
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Socket set, Wrench Set, Nutdriver, picks for \\\'O\\\' rings
1. removed top and replaced head cap and gasket
2. Removed cylinder and replaced 'O' rings
3. removed nose and replaced gasket and piston bumper
4. Cylinder plate did not come out easily but other than that repair went well
2. Removed cylinder and replaced 'O' rings
3. removed nose and replaced gasket and piston bumper
4. Cylinder plate did not come out easily but other than that repair went well
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Leak too much air,
Charles - May 14, 2017
Tool Type
Nailer
Difficulty
Medium
Time
30-60 minutes
Tools Used
Screwdriver, Pliers, Wrench Set, Allen wrench
Removed the four screws from the top cover
Looked to see what parts I would need to fix the leak.
I ordered about every o-ring and seal in the gun
Replaced all that I ordered
The gun is like new again
Looked to see what parts I would need to fix the leak.
I ordered about every o-ring and seal in the gun
Replaced all that I ordered
The gun is like new again
Did you find this story helpful?
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.
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