AVTJRCB JMHSS-CO Counterbore Cutter Straight Shank CB JM已售出0個HSS-CO Counterbore Cutter Straight Shank CB JM is a Japan-made HSS form milling cutter, designed for counterboring, letting screw heads sit flush with the workpiece. Available in screw sizes JM3~JM12, flute length 7~20mm, overall length 47~93mm, 4 flutes. Machines carbon & alloy steel, stainless steel, aluminum/copper & non-ferrous, up to HRC35.
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Product Overview: HSS Counterbore End Mill Straight Shank – CB JM Series
【Product Features & Why We Recommend It】
- Japanese Original Manufacturer Quality: Manufactured directly by a Japanese original factory with rigorous quality control — recommended for users with high demands on counterbore forming accuracy and tool consistency.
- Stainless Steel Upgraded Version: Compared to the standard CB series, the CB JM series raises the maximum machining hardness to HRC35 and adds M-class stainless steel material compatibility — recommended for applications requiring counterbore machining across multiple material types including carbon steel, alloy steel, and stainless steel.
- Counterbore Dedicated Geometry: Features a specialized counterbore forming geometry — recommended for precision machining of screw counterbores, locating hole chamfers, and various counterbore seating surfaces, ensuring hole profile dimensions and seat surface flatness meet assembly requirements.
- 4-Flute Stable Forming: The 4-flute configuration evenly distributes cutting load — recommended for precision counterbore forming and finishing operations, effectively improving seat surface finish quality and dimensional consistency.
- Straight Shank Universal Clamping: The straight shank design is compatible with standard end mill holders — recommended as the standard configuration for general-purpose counterbore machining, offering convenient and stable clamping.
【Machining Applications & Uses】
- Primary Use: Screw counterbore forming, locating hole chamfer machining, and precision milling of counterbore seating surfaces on stainless steel and steel materials.
- Recommended Work Materials:
- P-Class (Carbon Steel / Alloy Steel): Structural steel, carbon steel, and alloy steel — recommended for hardness below HRC30, with the 4-flute design delivering stable counterbore forming cutting performance.
- M-Class (Stainless Steel): SUS304, SUS316, SUS420, and other high-toughness stainless steel and white iron — the core upgrade advantage of this series over the standard model, recommended for precision counterbore machining of stainless steel components.
- N-Class (Non-Ferrous Metals): Aluminum alloys, pure copper, brass, and engineering plastics — softer and adhesion-prone materials where the use of appropriate cutting fluid is recommended to ensure smooth chip evacuation and seat surface quality during counterbore machining.
