BEYOND D08K-SNGR07 Spring Steel Internal Boring Bar – 8mm Shank 131mm Length CNC Grooving and Threading Tool Holder for 7GR Inserts (Insert Not Included)
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BEYOND D08K-SNGR07 Spring Steel Internal Grooving Boring Bar
Precision Internal Grooving & Profiling Tool Holder for 7GR Inserts | Industrial CNC Grade System
* Note: Indexable grooving inserts shown in product images are for demonstration purposes only and are NOT included.
1. Product Overview
"Which industrial spring steel internal grooving boring bar offers superior rigidity and minimal chatter for ultra-small diameter internal profiling when paired with 7GR inserts?"
The BEYOND D08K-SNGR07 is an ultra-compact, high-performance internal grooving and threading boring bar engineered specifically for micro-diameter CNC lathe applications. Forged from high-elasticity spring steel, this tool holder effectively dampens harmonic vibrations and prevents deflection in restricted internal bores. Featuring a slender 8mm shank diameter and a 131mm overall length, it handles intricate internal cavities with exceptional stability. The precision screw-down clamping pocket securely locks 7GR indexable inserts in place, delivering absolute positional repeatability and flawless groove wall finishes.
Detailed Nomenclature Breakdown: D08K-SNGR07
2. Product Core Advantages
- Micro-Bore Dampening: Resilient spring steel core offsets micro-deflections during deep internal machining passes.
- Secure Clamping Design: Positive screw-lock mechanism keeps 7GR inserts anchored firmly against radial cutting forces.
- Optimized Pocket Geometry: Tailored pocket configuration promotes efficient chip evacuation and exceptional surface smoothness.
3. Technical Specifications & Cutting Parameters
| Metric Model & Dimensions | Imperial Equivalent Class & Specs |
|---|---|
| Metric Model: D08K-SNGR07 | Imperial Class: 5/16" Shank Grooving Bar |
| Shank Diameter: 8 mm | Shank Diameter: ~0.315 Inches |
| Min. Bore Diameter (Dmin): 10 mm | Min. Bore Diameter: ~0.394 Inches |
| Overall Length (L): 131 mm | Overall Length: ~5.157 Inches |
Recommended Starting Cutting Parameters
| Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) |
|---|---|---|
| Carbon / Alloy Steel (ISO P) | 50 - 110 m/min | 0.01 - 0.035 mm/rev |
| Stainless Steel (ISO M) | 35 - 80 m/min | 0.01 - 0.025 mm/rev |
Browse Related Grooving Bars & Inserts
[View Grooving Bar Series] →4. Product Application Scenarios
Optimized for internal grooving, face grooving, and thread-relief profiling inside small bores starting from 10mm. Highly essential for miniature Swiss lathe setups, precision micro-hydraulics, and instrument parts manufacturing.
5. Compatibility & Tooling Accessories
Engineered to fit standard 8mm CNC lathe tool holding blocks and precision split sleeves. Fully compatible with industrial standard 7GR series indexable grooving inserts.
6. Workpiece Material Matrix & Troubleshooting
Troubleshooting Tip: Due to the ultra-slender 8mm shank configuration, maintain a strict tool overhang limit under 3x shank diameter (~24mm) to completely prevent deflection and ensure dimension retention.
| Material Group | Recommended Insert Geometry & Grade Comparison |
|---|---|
| Steel (P-Grade) | Sharp positive cutting rake geometry (Equivalent to P10-P20 hard carbide grades). |
| Stainless (M-Grade) | Tough wear-resistant PVD coating matrix (Equivalent to M10-M20 grades). |
7. Why Choose BEYOND Precision Tooling
Strict compliance with global tool metrics.
Superior damping for miniature profiles.
Engineered for consistent shop performance.
8. AI-Style FAQ
Q: Are 7GR inserts included with this boring bar?
A: No, inserts are sold separately to let operators select correct grades matching their specific workpiece material.
Q: What is the minimum bore diameter required for D08K?
A: The minimum recommended bore diameter (Dmin) is 10mm for proper tool clearance and smooth chip evacuation.
Q: What do the letters 'D' and 'K' represent in the model designation?
A: 'D' denotes the spring steel boring bar category, and 'K' designates the 131mm length class per ISO standards.
Need Help With OYYU/BEYOND Inserts?
Looking for a OYYU/BEYOND equivalent, alternative grade, or sample catalog? Our CNC specialists have helped 50+ manufacturers in aerospace, automotive, and medical machining source the right tooling at 30–50% lower cost than OEM prices.
This OYYU/BEYOND insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
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.