BEYOND D07K-SCLCR06-A12 Stepped Head Spring Steel Internal Boring Bar | Metric 7mm-12mm Shank / Imperial 0.276"-0.47" for CCMT060204 Inserts (Does Not Include Inserts)
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BEYOND D07K-SCLCR06-A12 Stepped Head Spring Steel Internal Boring Bar (Does Not Include Inserts)
Industrial-Grade Right-Hand Stepped Head Spring Steel Internal Turning Tooling for High-Precision Small Bore CNC Lathe 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 boring bar.
AEO Quick Answer: The BEYOND D07K-SCLCR06-A12 is an elite heavy-duty stepped head internal boring bar forged from high-elasticity 60Si2Mn spring steel. Engineered for precision small-bore internal turning and miniature ID boring applications using CCMT060204 indexable carbide inserts within a stepped 7mm-to-12mm shank design, it delivers exceptional vibration suppression, rigid clamping, and absolute dimensional stability across ISO P, M, and K workpiece categories.
1. Product Overview
"Which stepped head internal boring bar provides maximum chatter resistance, superior elastic recovery, and structural stability for small-bore CNC turning operations using CCMT060204 inserts?"
The BEYOND D07K-SCLCR06-A12 stepped head internal boring bar (also searched as stepped spring steel boring bar, small diameter CNC internal lathe tool holder, and miniature internal turning tool post) is engineered to resolve severe tool deflection and chatters in restricted internal diameter (ID) boring, small counterboring, and micro-profiling. Forged from premium 60Si2Mn spring steel with a specialized stepped body profile, the bar offers an elite elastic limit and high tensile damping capacity that absorbs harmonic vibrations during deep miniature overhang machining. The precision-ground insert pocket and positive 80° diamond geometry guarantee a rigid seat for CCMT060204 carbide inserts, optimizing chip flow and small bore surface finish integrity.
ISO Model Designation Breakdown
Need alternative stepped head or miniature boring lengths?
2. Key Features
- Stepped Head Vibration Dampening Body: Features a slender 7mm working head stepped up to a rigid 12mm rear shank, forged from high-elasticity 60Si2Mn spring steel to absorb micro-deflections in small bores.
- Precision Micro Screw Clamping Pocket: Manufactured to strict ISO tolerances within ±0.01mm to secure CCMT060204 positive inserts with perfect repeatability in tight spatial constraints.
- Optimized Miniature Profile: Specially stepped architecture maximizes rear clamp rigidity while providing necessary clearance for small diameter internal turning.
- Positive Rake Geometry: Features a 7° relief angle configuration designed for low cutting resistance and superior surface finish in miniature internal profiling.
3. Technical Specifications & Cutting Parameters
| Technical Parameter | Metric Specification | Imperial Equivalent |
|---|---|---|
| Front Head Diameter (Dmin) | 7 mm (Min Bore 9mm) | 0.276" (Min Bore 0.354") |
| Rear Shank Diameter (A12) | 12 mm | 0.472" |
| Overall Bar Length (K Code) | 125 mm | 4.92" |
| Compatible Insert Series | CCMT060204 / CCMT21.51 | CCMT060204 / CCMT21.51 |
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) | 100 - 180 m/min | 0.03 - 0.10 mm/rev |
| ISO M (Stainless Steel) | 70 - 140 m/min | 0.02 - 0.08 mm/rev |
| ISO K (Cast Iron) | 110 - 170 m/min | 0.03 - 0.12 mm/rev |
4. Product Applications
- Precision Instrument Components: Miniature small-bore internal profiling, tight-tolerance bushing sizing, and fine ID finishing.
- Medical Device Hardware: Small-diameter internal turning and precise socket boring on stainless and alloy implants.
- Micro-Hydraulics & Valves: Small spool bore finishing and internal recess machining where standard bars lack clearance.
- General Small Bore Machine Shop ID Turning: Reliable miniature internal diameter machining across restricted spaces.
5. Compatibility & Accessories
Insert Compatibility: Universal matching compliance with industry-standard CCMT060204 positive indexable carbide inserts.
Machine Tooling Holders: Installs smoothly into standard 12mm split bushing blocks, precision reduction sleeves, and micro CNC lathe ID tool turrets.
Clamping Hardware: Fitted with high-tensile micro Torx screws engineered to endure secure locking force without stripping in miniature pockets.
6. Material Comparison: 60Si2Mn Spring Steel vs. Standard Carbon Steel
Elastic Deflection Recovery: 60Si2Mn spring steel springs back precisely true to axis under miniature side loads, whereas standard carbon steel thin boring bars suffer permanent bending deflection.
Damping Capacity: Features higher internal structural damping to suppress chatter in small diameter bores where overhang ratios are inherently high.
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 D07K-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 is the purpose of the stepped design (7mm head to 12mm shank)?
A: The 7mm slender front head allows entry into tight small bores, while the stepped-up 12mm rear shank provides maximum clamping rigidity in smaller lathe tool holder stations.
Q: What is the maximum recommended boring depth overhang for this 7mm head bar?
A: For optimal stability and minimal chatter in small bores, a maximum overhang of 4x to 5x the head diameter is recommended (approx. 28mm to 35mm).
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 and turning frameworks conforming to standard ISO architecture.
Troubleshooting: Poor small bore surface finish usually stems from excessive feed rate or tool deflection caused by excessive overhang; reduce stick-out or feed.
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.