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Screw - 90639221:DeWALTScrew - 90639221:DeWALTScrew - 90639221:DeWALT

Screw 90639221

Part Number: 90639221
DeWALT
Availability: In Stock
Price: $3.99
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Product Information
Description:
This is an individual screw used on various models of chainsaws to fasten and secure the drive sprocket, located beneath the chain cover around the guide bar. Both the chain cover and guide bar need removal to replace this screw. Made of high-quality metal, this screw is an M5X8.5 left-hand OEM screw designed to secure a washer (sold separately) to the primary drive sprocket, ensuring its retention within the chain drive. For optimal performance, it is recommended to replace both the screw and accompanying washer simultaneously to maintain a secure connection. If your drive sprocket is stripped, worn down, or any part of this assembly is damaged, consider replacing this screw to effectively secure the sprocket, washer, and chain drive.
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Repair Instructions: Submitted by Customers Like You
1 of 1 people found this instruction helpful
Tool Type:
Chain Saw
Parts Used:
Screw - 90639221
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Power Drill, Wrench Set, Bench Grinder
Chain wouldn't stay on the sprocket
I tried to tighten the left handed screw into the sprocket but it just snapped. Dewalt has crap fasteners now, I assume to save 5 cents. The steel in their bolts is either aluminum or garbage soft steel.

Anyway. Even with the replacement bolt there is a gap between the bolt head and sprocket, so I drilled out a washer and ground it flat to put additional pressure on the outside edge of the sprocket and take up the gap between the bolt head and gear. Ran the chainsaw for another couple of hours, no further issues.
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Tool Type:
Chain Saw
Parts Used:
Washer - 90618229
Screw - 90639221
Repair Difficulty:
Medium
Time Spent Repairing:
15-30 minutes
Tools Used:
Power Drill, Socket set
chain detached from sprocket
removed bar and chain
cleaned parts of accumulated sawdust
replaced washer and LEFT-handed screw to sprocket shaft
reinstalled bar with chain
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Tool Type:
Chain Saw
Parts Used:
Screw - 90639221
Shaft Assembly - N539694
Repair Difficulty:
Medium
Time Spent Repairing:
30-60 minutes
Tools Used:
Screwdriver, Pliers, Socket set
Reverse thread screw broken off in shaft assembly. Had to replace both.
Remove cover on saw saw.
Remove all parts under cover.
Remove rear handle.
Remove inner cover.
Remove shaft assembly.
Reverse order to reassemble.
Note!!!!!! Do not disasemble saw until you receive your parts. Its hard to remember how it
goes back together two days later. Not easy job at that point.
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Tool Type:
Chain Saw
Parts Used:
Drive Sprocket - 90618228
Washer - 90618229
Screw - 90639221
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Screwdriver, Pliers, #15 star bit long reach
Lost the screw and washer on the chain sprocket
Removed the bar and chain and outer cover with recessed #15 extended star bit. That allowed access to the chain sprocket. Lifted out the old replaced with new along with left hand thread screw and new washer. Reassembled the case bar and chain.
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Tool Type:
Chain Saw
Parts Used:
Drive Sprocket - 90618228
Screw - 90639221
Chain - N594321
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Screwdriver, Socket set, Nutdriver
Drive Sprocket striped
1 Removed the chain cover and chain and bar
2 removed the sprocket
3 replaced sprocket
4 reassembled the cover and replaced chain and bar
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Tool Type:
Chain Saw
Parts Used:
Drive Sprocket - 90618228
Washer - 90618229
Screw - 90639221
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Wrench Set
drive sprocket damaged
followed directions online on how to remove drive sprocket--easier than thought to repair
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Tool Type:
Chain Saw
Parts Used:
Drive Sprocket - 90618228
Washer - 90618229
Screw - 90639221
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Screwdriver, Pliers, Power Drill, Nutdriver
Drive sprocket stripped
Removed housing and shield, cleaned up all the dirt and sawdust, pulled out old sprocket, and put on new one. It turned out the screw holding the old washer had not backed out but actually broke off. I used a drill and bit going forward to back out the remnants of the left-handed screw, put on the new washer, and installed the new screw. Easy-peasy.
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Tool Type:
Chain Saw
Parts Used:
Washer - 90618229
Screw - 90639221
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Screwdriver
Washer and screw were missing causing the chain to come off.
Replaced washer and screw.
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Tool Type:
Chain Saw
Parts Used:
Washer - 90618229
Screw - 90639221
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Adjustable Wrench
Bolt broke off. Had to remove and replace
Removed remaining bolt and replaced with new bolt and washer.
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Tool Type:
Chain Saw
Parts Used:
Screw - 90639221
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Screwdriver
stripped screw
Removed stripped screw. Replaced with new screw.
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Reviews
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Average Rating (out of 5):
3 Reviews
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  • Chain saw
    Got the correct parts to get my chainsaw back to work again
    Guest - May 4, 2021 Verified Purchase
    Super fast shipping!!! Thanks
    Was exactly what I needed. Great service!!!
    Guest - October 22, 2020 Verified Purchase
    Just what I needed to get back to work cutting Firewood!
    The part was the one I needed and it arrived quickly!
    Guest - June 24, 2020 Verified Purchase
    Verified Purchase
    eReplacementParts Team
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