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Sheartak Spiral Cutterhead for Carba-Tec 12" Jointer – 6 Spirals
Upgrade your Carba-Tec 12" jointer with a Sheartak spiral cutterhead and experience a dramatic improvement in finish quality, noise reduction, and long-term performance.
Woodworkers are increasingly replacing traditional straight-knife cutterheads with spiral designs—and for good reason.
Key Benefits
✔ Glass-Smooth Finish, No Tear-Out
Each carbide insert is set at a precise shear angle, delivering a true shear cut. Combined with the staggered spiral layout, this eliminates tear-out and produces a clean, glossy finish—even on highly figured hardwood.
✔ Significantly Quieter Operation
Only a few inserts engage the wood at any given time, reducing cutting noise substantially compared to straight blades.
✔ Long-Lasting Carbide Inserts
Equipped with 15×15×2.5mm tungsten carbide inserts, each featuring four usable cutting edges. Enjoy up to 10× longer life than traditional high-speed steel knives.
✔ Quick & Easy Maintenance
No knife setting required. Inserts are precision-ground to tight tolerances (±0.01mm / ±0.0004"). Simply rotate the insert 90° for a fresh edge—ready in minutes.
✔ Improved Dust Extraction
Produces smaller, thinner chips for smoother chip flow and reduced clogging at the dust port.
✔ Lower Operating Cost
Eliminates sharpening, reduces sanding time, and increases efficiency—saving both time and money over the long run.
Specifications
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Designed for Carba-Tec 12" Jointer
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6 Spiral Rows
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Premium tungsten carbide inserts (15×15×2.5mm)
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Precision balanced for smooth operation
Package Includes
Upgrade once. Enjoy superior performance for years.
Do I need to replace the original bearings?
If the bearings in your machine are in good condition, they can be reused by carefully removing them with a bearing or pulley puller. However, if the bearings are tightly pressed onto the shaft, removal may cause damage. To minimize this risk, we recommend replacing old bearings with our greased and sealed bearings, designed for long-lasting performance. For a smooth upgrade, we suggest adding the bearings to your shopping cart before completing your purchase.
We provide premium bearings from NSK, SKF, NTN, FAG, Timken. They are renowned for their high quality and performance, designed to provide durability and reliability in various applications
Do I need to to Add a Few Boxes of Carbide Inserts
We provide 5 carbide inserts and 5 screws as spare parts. However, many of our customers choose to purchase additional boxes, as the shipping costs for separate purchases can make it less economical.
Do I need a Torque Wrench?
To securely lock the carbide inserts, we recommend applying a torque of 48 to 52 Pound-Inches (or 5.42 to 5.88 Newton-Meters). (Note: 1 Newton-Meter is equal to 8.851 Pound-Inches, and 1 Pound-Inch is approximately 0.113 Newton-Meters.) It is crucial not to apply excessive torque, as this could cause the carbide inserts to crack or explode. On the other hand, using too little torque may result in the inserts not being properly secured, which could lead to cracks, shattering, or uneven height on the cutter block, causing ridges or lines on the board.
If one person is responsible for maintaining the machine, they can typically apply the same torque consistently without a torque wrench. However, when multiple people are involved in machine maintenance, ensuring uniform torque application can be challenging. For consistency and peace of mind, we recommend using a torque wrench.
What kind of steel the cutter block is made of?
The cutter block is constructed using GB/T 40Cr, a structural alloy steel of the same caliber as ASTM grade 5140, AISI 5140, SAE 5140, DIN 41Cr4, BS 41Cr4, JIS SCr440, and EN 41Cr4.The primary components of this steel are as follows: carbon (C) at a range of 0.37-0.44%, silicon (Si) between 0.17-0.37%, manganese (Mn) within 0.50-0.80%, and chromium (Cr) from 0.80-1.10%.
In terms of physical properties, this steel exhibits a tensile strength range of 115-234σb/MPa, a yield strength of 2σ 0.2 ≥/MPa, and an elongation capacity of 65 δ5≥ (%). It also has a HBS range of 123-321 and a HRC rating of 30.
This alloy steel is frequently utilized in low to moderately stressed components for machines, engines, and vehicles.
