NIKKEN RAC Balance‑Cut Boring Unit (53–70 mm) + 16 pcs Carbide Inserts (NOS)

This NIKKEN RAC Balance‑Cut Boring Unit is a precision Japanese‑engineered boring system designed for high‑accuracy internal machining. The 53–70 mm boring range covers medium‑diameter finishing and semi‑finishing operations. NIKKEN’s balance‑cut dual‑cartridge design reduces vibration, improves surface finish, and maintains concentricity under load.

The boring head is equipped with a 26 mm straight shank, ready to mount into standard boring bar holders, modular blocks, or custom tool setups. No taper arbor is fitted — this is the bare 26 mm shank version.

Included are 16 NOS carbide inserts, compatible with the RCC‑53 cartridge family, suitable for steel, stainless steel, cast iron, and aluminum depending on grade.

For more detail, click on the link below

https://www.nikken-kosakusho.co.jp/upload/product/detail_attach/attach00001493.pdf

Features and Performance

• 53–70 mm boring diameter range — Ideal for medium‑diameter precision boring.
• 26 mm straight shank — Clean, unfitted mounting shank for universal toolholder compatibility.
• Balance‑Cut dual‑cartridge system — Reduces chatter and improves surface finish.
• Compatible with RCC‑53 cartridges — Supports multiple insert geometries and materials.
• Includes 16 NOS carbide inserts — Factory‑fresh, unused.
• Used boring head in good condition — Fully functional, smooth adjustment.
• Japanese build quality — Hardened steel body, precision machining.

Included

• 1 × NIKKEN RAC Balance‑Cut Boring Unit (53–70 mm, 26 mm shank) — Used, good condition

• 16 × Carbide inserts — NOS, unused

• Original NIKKEN packaging

Specifications

Keywords

NIKKEN RAC boring head; RCC‑53; balance‑cut boring unit; 53–70 mm boring head; 26 mm shank; carbide inserts NOS; Japanese tooling; precision boring tool; machinist toolroom equipment.