Spiral Jointer Head for Hitachi P12R Portable Thickness Jointer is a premium upgrade designed to replace traditional straight knife cutterheads with modern spiral carbide technology. This retrofit dramatically improves surface finish, reduces noise, and increases cutting efficiency for professional woodworking applications.
Key Benefits
Smoother Finish with No Tear-Out
Each carbide insert is positioned at a slight angle, producing a shearing action rather than a straight cut. The staggered cutting pattern greatly reduces tear-out and delivers a smooth, glossy finish—even on highly figured hardwoods.
Reduced Noise
The spiral arrangement allows multiple small cuts instead of one continuous impact cut, significantly reducing operating noise compared to traditional straight knife systems.
Long Tool Life
Carbide inserts last up to 10× longer than high-speed steel blades. The 15 × 15 × 2.5 mm inserts are made from sintered tungsten carbide, offering exceptional hardness and wear resistance. Each insert features 4 cutting edges for extended service life.
Quick and Easy Maintenance
Precision-ground inserts are interchangeable within tight tolerances (±0.01 mm / ±0.0004"). When an edge becomes dull, simply loosen the screw and rotate the insert 90° for a fresh cutting edge. This minimizes downtime and improves productivity.
Improved Dust Extraction
The spiral cutting action produces smaller, thinner chips, making dust extraction more efficient and keeping your workspace cleaner.
Lower Operating Cost
No sharpening is required, and sanding time is greatly reduced due to superior surface finish. The system pays for itself quickly through improved efficiency and reduced consumable costs.
Sheartak Cutterhead Kit Includes
- High tensile strength alloy steel cutter block
- 20 carbide inserts pre-installed on spiral cutterhead
- 5 extra carbide inserts (spares)
- 5 extra screws (spares)
- 1 installation wrench
Applications
Ideal for professional woodworking, cabinetry, and workshop use where smooth finishes, reduced noise, and long tool life are required.
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.
