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8-1/​​2 998840M

Part Number: 998840M
Metabo HPT (Hitachi)
Availability: In Stock
Price: $53.90
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*This part replaces obsolete part #: 998840.

Product Information
Specifications
Diameter: 8-1/2"
Teeth: 24
Arbor Size: 5/8"
Grind Type: ATB
Notes: Hook 15 Degrees, Kerf .087", Carbide Grade C2 micrograin
Description:
Hitachi saw blades feature:

  • Tri-Metal Shock Resistant Brazing. Brazing the carbide tips with three metals allows the tips to withstand extremem impact for maximum durability.

  • Precision Balancing and Tensioning. Using a computer controlled process, blades are tensioned to remain stabilized and balanced while in use (10" and larger).

  • Precision Ground Thin Kerf Teeth. Hitachi's kerf thickness allows for tight, clean, precise and fast cuts.


  • Industrial High Performance Selected Micrograin Carbide. Micrograin structure provides extremem impact resistance, durability and longevity.

  • Large Micrograin Carbide Teeth. Allows multiple resharpenings and prolongs blade life.

  • Premium Laser Cut Steel Plate. Thin and strong high grade laser cut HRC44 plate keeps blade flat and true for long lasting performance.
  • Compatibility
    Products Compatibility

    This item works with the following types of products:

    • • Miter Saw
    • • Saw

    Questions & Answers for 8-1/​2


    No questions have been asked yet
    Repair Instructions: Submitted by Customers Like You
    Tool Type:
    Miter Saw
    Parts Used:
    Ball Bearing - 608VVM
    Cord - 500241Z
    Carbon Brush Set - 999043
    Ball Bearing - 6001VV
    Nylon Clip - 948193
    Bearing Lock - 976301
    Indicator - 996220
    Indicator - 322026
    Ball Bearing 6004vvcmps2l - 6004VV
    Cord Armor D10.1 - 994565
    8-1/2 - 998840M
    Rubber Ring - 958130
    Repair Difficulty:
    Medium
    Time Spent Repairing:
    More than 2 hours
    Tools Used:
    Screwdriver, Pliers, Bench Grinder, Hammer , Bearing Puller, Putty Knifes,Dsocket
    I had bearing failure on the armature lg bearing & also in the gear spindle. I also replaced two broken pointers, a bad cord, & installed a new cord with clips that had broken.
    1) Disassembled the saw & ordered the parts I needed to repair. When replacing bearings it's best to replace all of them due to their age.
    2) I began the repair on the bearings on the armature the small one first. It came right off with the bearing puller I cleaned the tiny shaft & placed the new bearing in the shaft and tapped with the hammer once square pushed it in by using an 8 inch C-Clamp.
    3) The larger bearing on the other end by the fan was really bad but the puller had to be modified so I could get behind the bearing to be able to pull it off. Once off the same procedure was used to install the larger one.
    4) The Armature bearings have been replaced now to reinstall it into the handle portion, cleaned then installed the new bearing, installed the armature then installed the set of new brushes & reinstalled the handle section to the saw.
    5) The gear spindle bearings I thought would be a challenge but the larger recessed bearing came right off easily by pulling the aluminum holder with the bearing once off push the bearing out if the aluminum holder with your fingers.
    6) The smaller bearing on the end by the gear was so close I had to use 2 putty knifes to pry off enough to be able to get 2 larger screw drivers under it to finish prying off.
    7) Once apart clean and reinstall both bearings being mindful to assemble the larger one first into the aluminum holder & making sure it starts square. For squeezing this on I used a deep well socket that fit over the shaft but making sure it was also touching the inner race as not to damage the bearing. I then squeezed it on by using the C-Clamp it will stop in the correct place on the shaft by itself. Now for the smaller bearing in the other end start square then squeeze on but this time you have to use a small washer that fits over the small shaft cause the bearing goes by the end if the shaft by .020 there bearings installed.
    8) Grease and install into saw finish installing blade guards and new blade.
    9) I then installed the new cord with clips and new pointers.
    All parts now installed and the saw is like new again. I have had and use this saw so much I hated to buy a new one because of it' simplicity I am very pleased with the repair as well as ereplacement.com for making the parts available for purchase. Just take your time and pay attention to detail and you will have the same success.
    Did you find this story helpful?
    Thanks for voting and helping fellow customers!
    Tool Type:
    Miter Saw
    Parts Used:
    8-1/2 - 998840M
    Repair Difficulty:
    Easy
    Time Spent Repairing:
    Less than 15 minutes
    Tools Used:
    , Saw wrench
    I just changed the saw blade. The old one was too old to resharpen any more.
    Just unplug the saw, lock the shaft out, remove the bolt, take off old blade, replace with new blade of choice, replace bolt in blade, unlock shaft, then plug the cord into proper outlet and test the new blade. Not too difficult.
    Did you find this story helpful?
    Thanks for voting and helping fellow customers!
    Product Information
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