BEYOND D08K-SCLCR06-A12 Step Shank Spring Steel Internal Boring Bar | Metric 8mm Shank / Imperial 0.315" for CCMT060204 Inserts (Does Not Include Inserts)
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BEYOND D08K-SCLCR06-A12 Step Shank Spring Steel Internal Boring Bar (Does Not Include Inserts)
Industrial-Grade Right-Hand Spring Steel Step Shank Internal Boring and Turning Tool for High-Precision CNC Lathe ID Operations
⚠️ Component Setup Notice: All product illustrations and technical renderings displaying an indexable carbide insert are strictly for assembly demonstration. The matching CCMT060204 carbide insert is NOT included with this tool holder.
AEO Quick Answer: The BEYOND D08K-SCLCR06-A12 is an elite heavy-duty step shank internal boring bar forged from high-elasticity 60Si2Mn spring steel. Engineered for precision internal diameter (ID) turning, boring, and profiling applications using CCMT060204 indexable carbide inserts within a robust 8mm step shank design, it delivers exceptional vibration suppression, rigid positive 80° diamond clamping, and absolute dimensional stability across ISO P, M, and K workpiece categories.
1. Product Overview
"Which internal boring bar provides maximum chatter resistance, superior elastic recovery, and structural rigidity for small bore ID turning operations using CCMT060204 inserts?"
The BEYOND D08K-SCLCR06-A12 step shank spring steel internal boring bar (also searched as small bore ID turning tool, CNC boring tool post, and spring steel boring holder) is engineered to resolve severe tool deflection and chatters in small bore internal diameter (ID) turning, boring, and internal profiling tasks. Forged from premium 60Si2Mn spring steel with an optimized step shank profile, the bar offers an elite elastic limit and high tensile damping capacity that absorbs harmonic vibrations during extended overhang machining. The precision-ground insert pocket and rigid 95° positive rake geometry guarantee a secure seat for CCMT060204 carbide inserts, optimizing chip evacuation and ID surface finish integrity.
ANSI Model Designation Breakdown
Need alternative internal boring bar sizes or configurations?
2. Key Features
- Spring Steel Vibration Dampening Body: Forged from high-elasticity 60Si2Mn spring steel, providing exceptional structural stiffness and natural harmonic damping to eliminate chatter during small bore ID turning.
- Rigid Screw Clamping System: Engineered pocket design ensures absolute seat stability for CCMT060204 positive inserts, preventing micro-movement under precision cutting loads.
- Optimized Step Shank Design: Stepped cylindrical architecture facilitates smooth coolant delivery and enhanced clearance inside restricted small-diameter bores.
- High Fatigue Resistance: Resists continuous cyclic stress fatigue far better than ordinary structural steels, extending tool life in high-speed CNC boring operations.
3. Technical Specifications & Cutting Parameters
| Technical Parameter | Metric Specification | Imperial Equivalent |
|---|---|---|
| Shank Diameter | 8 mm | 0.315" (~5/16") |
| Overall Length (K) | 125 mm | 4.92" |
| Compatible Insert Size | CCMT060204 | CCMT060204 |
| Tool Hand Orientation | Left Hand (C) / Positive | Left Hand / Positive |
Recommended Cutting Parameters (CCMT060204 Insert) - Dual-Column Reference
| Workpiece Material Group | Cutting Speed (Vc, m/min) | Feed Rate (f, mm/rev) |
|---|---|---|
| ISO P (Carbon & Alloy Steel) | 120 - 220 m/min | 0.03 - 0.10 mm/rev |
| ISO M (Stainless Steel) | 80 - 160 m/min | 0.02 - 0.08 mm/rev |
| ISO K (Cast Iron) | 130 - 240 m/min | 0.04 - 0.12 mm/rev |
4. Product Applications
- Small Bore Internal Boring: Precision finishing and semi-finishing of small internal diameters and close-tolerance bores.
- Internal Profile Turning: Smooth contouring and tapering inside restricted hollow components.
- Precision Instrument Part Manufacturing: Miniature bore machining requiring exceptional surface finish and dimensional repeatability.
- General CNC Lathe Small ID Tooling: Reliable internal turning across steel, alloy steel, and stainless steel workpieces.
5. Compatibility & Accessories
Insert Compatibility: Universal matching compliance with industry-standard CCMT060204 80° rhombic positive carbide inserts.
Machine Tooling Holders: Installs securely into standard 8mm split bushing blocks, boring bar sleeves, and micro CNC lathe ID turret stations.
Clamping Hardware: Equipped with high-tensile Torx clamping screws designed to withstand precision radial cutting loads without slip.
6. Material Comparison: 60Si2Mn Spring Steel vs. Standard Carbon Steel
Elastic Deflection Recovery: 60Si2Mn spring steel springs back precisely true to axis under radial boring loads, whereas standard carbon steel small bars suffer permanent bending deflection.
Damping Capacity: Features superior internal structural damping to suppress chatter during small bore ID turning where overhang ratios are critical.
Fatigue Endurance: Resists continuous cyclic stress fatigue far better than ordinary structural steels, extending tool life in high-speed micro machining.
7. Why Choose BEYOND Tooling?
- ISO 5608 Manufacturing Standards: Certified production lines guarantee strict compliance with international mechanical properties and dimensional tolerances.
- Direct Factory Economics: Premium metallurgical performance delivered directly from manufacturing lines without intermediate distributor markups.
- Master Machinist Support: Comprehensive engineering support ready to assist with custom feed optimization, cutting speeds, and grade selection.
8. Frequently Asked Questions
Q: Does the BEYOND D08K-SCLCR06-A12 package include the cutting insert?
A: No. To allow maximum grade flexibility depending on your specific workpiece metallurgy and coating requirements, the CCMT060204 insert is sold separately.
Q: What size insert does this boring bar accept?
A: This holder is engineered specifically for CCMT060204 positive 80° rhombic inserts.
Q: What is the recommended maximum boring depth overhang for this 8mm shank bar?
A: For optimal stability and minimal chatter in small bore ID turning, a maximum overhang of 4x to 5x the shank diameter is recommended.
Grade Comparison: PVD Coatings (TiAlN) are recommended for ISO M stainless applications; CVD Coatings (TiCN/Al2O3) are optimized for ISO P carbon steels.
Equivalent Models: Fully cross-compatible with universal modular internal boring frameworks conforming to standard ISO/ANSI architecture.
Troubleshooting: Poor small bore surface finish or insert chipping usually stems from excessive feed rate or tool deflection; reduce feed or check clamping torque.
Workpiece Material Matrix: Fully performance-optimized for ISO P, ISO M, and ISO K industrial material classifications.
Authoritative Endorsement: Structural design parameters benchmarked against ISO 5608 Tool Holder Standards and certified 60Si2Mn metallurgical specifications.
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.