Core Specifications & Design Advantages

1. SDJCL1212H11 Coding Breakdown

• SDJCL: Denotes a 93° Left-Hand External Turning Tool Holder with Screw Clamping—breakdown:
  • S: Screw clamping system, using high-tensile screws to lock DCGT11 inserts securely, resisting loosening during high-torque finishing of precision components (e.g., automotive connector shafts).
  • D: 93° cutting edge angle , optimized for close access to 90° shoulders on stepped workpieces (e.g., φ18mm alloy steel valves) without tool interference, ensuring no dimensional deviation on narrow steps.
  • J: Reduced shank clearance, tailored for compact tool turrets on Swiss-type and mid-sized CNC machines, minimizing space occupation while maintaining cutting stability .
  • C: Regular clearance angle (7°), balanced for semi-finishing to finishing of soft-to-medium-hard materials (HB 120-280), ensuring efficient chip evacuation and controlled 断屑 (chip breaking) .
  • L: Left-hand cutting direction, designed for machining external features when spindle rotation or workpiece orientation requires left-hand tool paths (e.g., reverse-facing of precision flanges).
• 1212: Tool holder size code—breakdown:
  • First 12: 12mm shank width (square cross-section: 12x12mm) , compatible with mid-sized CNC lathes (e.g., Haas ST-15, Mazak QT Nexus 200) and Swiss-type machines with 12mm tool turrets.
  • Second 12: 12mm shank height , ensuring precise alignment of the insert’s cutting edge with the workpiece rotation axis—avoiding concentricity errors on precision shafts.
• H11: Insert compatibility & clamping feature—breakdown:
  • H: Standard clamping pocket design for DC-series inserts with an 11mm inscribed circle diameter (IC=11mm) .
  • 11: Matches insert thickness specifications, optimized for DCGT11T304 (3.97mm thickness) inserts to ensure minimal runout (≤0.003mm) and accurate cutting geometry.

2. Performance for Precision Machining

• Swiss-Type Optimization: The compact 100mm length and reduced clearance design keep the cutting zone close to the guide bushing , minimizing overhang-induced vibration and ensuring stability for φ12-20mm thin-walled components.
• Material Adaptability:
  • Carbon steel (10#, 45#): Ideal for left-hand finishing of shafts, with TiAlN-coated DCGT11T304 inserts delivering consistent surface finishes (Ra <0.8μm) and meeting 定额换刀 (scheduled tool change) standards in unattended production .
  • Alloy steel (40Cr): Handles semi-finishing of high-precision fittings, preserving ±0.005mm tolerance even with complex stepped features.
  • Pre-hardened steel (HRC ≤35): Performs reliably with wear-resistant carbide inserts, avoiding edge chipping during high-speed turning of sensor components.
  • Note: For HRC >35 hardened steel, upgrade to PCBN inserts and reduce cutting speed by 50% to maintain precision.
• Efficiency for Unattended Production: The screw clamping design enables quick insert changes (≤30 seconds with a T8 wrench), while coolant-through channels (M5 ports) extend insert life by 30% via targeted heat dissipation — critical for meeting long-duration machining requirements in unattended setups .

Compatibility & Optimal Parameters

1. Insert & Equipment Fit

• Recommended Inserts: DCGT11T304 (IC=11mm, thickness=3.97mm) and DCGT11T308 carbide inserts (uncoated/TiAlN-coated) for steel; PCBN inserts for hardened materials .
• Machine Compatibility: Fits mid-sized CNC lathes and Swiss-type machines with 12mm square shank tool turrets, suitable for workpieces with diameters from φ12mm to φ60mm.
• Accessories: Includes T8 wrench for clamping; uses M3×6 replacement screws for routine maintenance; compatible with M5 coolant adapters (sold separately).

2. Optimal Cutting Parameters

Practicality & Quality Assurance

• Durable Precision Build: High-strength alloy steel shank with anti-corrosion coating resists wear, extending service life to 12,000+ insert changes — ideal for medium-batch production.
• Micro-Precision Machining: Clamping pocket tolerance (±0.002mm) ensures consistent insert positioning, reducing part size variation across batches to ≤0.005mm — meeting automotive component standards .
• Coolant-Ready Design: Integrated M5 side coolant ports enable quick connection to machine coolant systems, eliminating the need for aftermarket modifications.
• Protective Packaging: Individual anti-impact box with custom foam inserts protects the holder’s precision surfaces and coolant ports during shipping/storage.
• Clear Identification: Laser-marked "SDJCL1212H11" for quick selection, avoiding mix-ups with right-hand variants (e.g., SDJCR1212H11) or DCMT07-compatible holders (SDJCL1212H07).