Hertel H59874107 Boring Insert TPCB221 HT310B Solid Carbide

Product Description

The HERTEL H59874107 is a solid carbide boring insert in the TPCB221 geometry, manufactured to grade HT310B and supplied uncoated. It features a 60-degree triangular shape with an 11-degree relief angle, a 1/4-inch inscribed circle, a 3/32-inch thickness, and a 1/64-inch corner radius (0.0150 inches decimal). The insert is held in place via a screw-clamp method and carries a material grade designation of C25. Machining professionals and toolroom technicians use this insert for precision boring operations where a sharp, uncoated solid carbide edge is required for close-tolerance internal diameter work.

This insert is suited for boring applications on CNC turning centers, boring bars, and dedicated boring heads in production and job-shop environments. The TPCB-style geometry with a 60-degree included angle is a common triangular configuration used in light-to-medium material removal on a range of workpiece materials where the C25 carbide grade is appropriate. The screw-clamp holding method provides positive indexing and repeatable edge positioning during setup. This insert ships individually with a minimum order quantity of 10 units per order.

Key Features

• Solid carbide construction, uncoated, material grade C25
• 60-degree triangular shape (TPCB221) with 11-degree relief angle
• 1/4-inch inscribed circle (0.2500 inches) for precise boring bar compatibility
• 1/64-inch corner radius (0.0150 inches decimal) for tight-tolerance boring
• 3/32-inch thickness (0.0960 inches decimal) for stable seating in the pocket
• Screw-clamp insert holding method for secure, repeatable indexing
• Manufacturer grade HT310B for defined cutting performance classification

Compatibility

Designed as a direct-replacement or standard-stock boring insert for toolholders and boring bars accepting TPCB221-style triangular inserts with a screw-clamp seating method and a 1/4-inch inscribed circle. Verify pocket geometry and insert seat dimensions against your specific boring bar specification before installation.

Installation Notes

Insert installation and indexing should be performed by a qualified machinist or toolroom technician with the machine powered down and locked out per OSHA lockout/tagout procedures. Use the correct torque driver or insert screw tool specified by the boring bar manufacturer when seating the screw-clamp fastener. Inspect the insert pocket for chips or debris before seating a new or indexed insert to ensure full contact and prevent edge chipping. Handle solid carbide inserts carefully to avoid chipping cutting edges during storage and setup.