S20R-SDJCR11 Boring Bar / Turning Tool Holder

The S20R-SDJCR11 Boring Bar is a high-precision internal toolholder designed for DCMT 11 positive inserts. With its 20 mm round shank, the S20R-SDJCR11 Boring Bar provides rigidity and accuracy for internal turning, profiling, and boring operations. Built with a secure screw-clamping system, the S20R-SDJCR11 Boring Bar ensures stable insert positioning, reduced vibration, and long tool life in machining steels, stainless steels, and non-ferrous alloys.

This internal boring bar features a 93° approach angle, allowing efficient boring in tight spaces and accurate machining of inner diameters. The use of DCMT inserts with positive rake geometry minimizes cutting forces and improves chip evacuation, which results in superior surface finishes. The tool is especially effective in finishing and semi-finishing operations, making it ideal for applications in automotive, aerospace, and precision engineering industries.

Thanks to its strong design, the S20R-SDJCR11 is well-suited for continuous cuts and fine boring tasks where dimensional accuracy is critical. It is an excellent choice for CNC lathes and conventional machines working on small to medium-sized bores.

Code Breakdown

• S – Screw clamping system

• D – Insert shape: 55° diamond (DCMT)

• J – Holder style with 93° approach angle

• C – Insert clearance: 7° positive relief

• R – Right-hand boring bar

• 20 – Shank diameter: 20 mm

• R – Shank type: round

• 11 – Seat size for DCMT 11 inserts

Key Features of the Boring Bar

• 20 mm round shank for internal turning stability

• Designed for DCMT 11 positive inserts

• Screw clamping for secure seating and accuracy

• 93° approach angle for boring and profiling

• Reliable for steels, stainless steels, and non-ferrous alloys

Equivalent Boring Bars (Other Brands)

• Sandvik: S20R-SDJCR11-4325 (Sandvik official site)

• Seco: S20R-SDJCR11

• Kennametal: S20R-SDJCR11 KCTL

• Iscar: S20R-SDJCR11-D

Application Guidelines

• Compatible inserts: DCMT 11T302, DCMT 11T304, DCMT 11T308

• Bore diameter range: ≥ 24 mm (recommended for stability)

• Best suited for finishing and semi-finishing boring operations

• Typical industries: automotive, aerospace, precision machining

For DCMT inserts and more boring bars, visit our Diamond Cut store.