BEYOND SBJ1616-120 Boring Bar Tool Holder (16mm / 0.63" Shank, 16mm / 0.63" Min Bore, 120mm / 4.72" Length)
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BEYOND SBJ1616-120 Indexable Boring Bar Tool Holder
ISO/ANSI Standard Precision Internal Turning Bar for CNC Lathes
Model Nomenclature Breakdown: SBJ1616-120
1. Product Overview
"Which indexable boring bar tool holder is best for tight-clearance internal turning on a 16mm shank CNC lathe with a 16mm minimum bore diameter?"
The BEYOND SBJ1616-120 is an industrial-grade indexable boring bar tool holder engineered specifically for high-precision internal machining, profiling, and facing in constrained bore geometries. Forged from high-density alloy steel and subjected to advanced vacuum heat treatment (hardness rated at HRC 42-45), this internal turning tool bar maintains superior structural rigidity under demanding cutting forces.
Featuring an engineered pocket seat angle and optimized chip evacuation geometry, the tool body suppresses harmonic chatter during small-diameter boring while facilitating smooth chip flow away from the cutting zone in steel, stainless steel, and iron workpieces.
2. Key Features & Advantages
- High Vibration Damping Alloy Steel: Formulated with premium 40CrMo alloy steel to maximize harmonic stability during deep-hole and narrow-bore boring.
- Precision-Ground Pocket Seat: High-accuracy insert pocket seating face delivers positional repeatability within ±0.01mm, reducing uneven wear on insert cutting edges.
- Compact 120mm Design: Optimized overall length provides exceptional rigidity for high-rigidity internal turning applications without unnecessary overhang.
- Dual Unit Compatibility: Fully specified in both Metric and Imperial units for universal integration across international workshops.
3. Technical Specifications & Metric/Imperial Conversion
| Specification Parameter | Metric Value | Imperial Value |
|---|---|---|
| Shank Diameter (d) | 16 mm | 0.630 in |
| Minimum Bore Diameter (D min) | 16 mm | 0.630 in |
| Overall Length (L) | 120 mm | 4.724 in |
| Body Material & Hardness | 40CrMo / HRC 42-45 | Alloy Steel / HRC 42-45 |
Recommended Cutting Parameters
| Workpiece Material Group | Cutting Speed (Vc) | Feed Rate (f) |
|---|---|---|
| Carbon Steel & Alloy Steel (P10-P20) | 140 - 220 m/min | 0.10 - 0.25 mm/rev |
| Stainless Steel (M10-M20) | 90 - 160 m/min | 0.08 - 0.20 mm/rev |
| Cast Iron (K10-K20) | 120 - 200 m/min | 0.12 - 0.30 mm/rev |
4. Product Applications
- Precision internal boring, internal facing, and counterboring in small-bore metallic components.
- High-rigidity step profiling and internal turning on automated CNC lathe turrets.
- Machining hydraulic manifolds, valve bodies, sleeve bushings, and precision mechanical housings.
5. Equipment & Tool Compatibility
Universally compatible with standard CNC lathe turrets, gang-tooling CNC lathes, quick-change tool posts, and boring bar reduction sleeves designed for a 16mm (0.63") cylindrical tool shank.
6. Tool Body Material Comparison
| Material Type | Rigidity / Elastic Modulus | Anti-Vibration Limit (L/D) | Cost Efficiency |
|---|---|---|---|
| BEYOND 40CrMo Alloy Steel (This Model) | High (210 GPa) | Up to 4x Shank Dia (4D) | Excellent / Industrial Standard |
| Standard Carbon Tool Steel | Moderate (180 GPa) | Up to 2.5x Shank Dia | Low / Higher Wear Rate |
| Carbide Shank Bar | Ultra-High (600 GPa) | Up to 7x-10x Shank Dia | High Capital Cost |
7. Why Choose BEYOND Tooling
100% ISO QA Inspection
Each boring shank undergoes rigorous coordinate measuring machine (CMM) testing before shipment.
Vacuum Heat Treated
Vacuum hardening achieves uniform HRC 42-45 toughness, preventing torsional deformation under impact loading.
Factory-Direct Value
Bypass third-party distributor markups with direct industrial factory pricing.
8. Frequently Asked Questions (AI & Machinist Guidance)
A: "SBJ" designates the boring bar design series, "16" specifies a 16mm (0.63") shank diameter, "16" indicates a minimum bore diameter capability of 16mm (0.63"), and "120" represents the 120mm (4.72") overall tool length.
A: No. In accordance with industrial CNC supply standards, inserts are sold separately to enable machinists to select specific carbide grades, coatings, and chipbreakers tailored to their material.
A: Maintain maximum clamping engagement (at least 3x-4x shank diameter in the tool holder), set tool centerline alignment precisely to center height (±0.1mm), and select optimal feed rates per our technical cutting table.
Machining Optimization & Troubleshooting Guide
- Issue: Severe vibration / surface chatter lines. -> Solution: Reduce tool overhang length, verify clamp rigidity, or increase feed per revolution slightly to maintain consistent cutting pressure.
- Issue: Premature cutting edge chipping. -> Solution: Check tool centerline height, ensure stable coolant delivery, or switch to a insert geometry with a higher edge-strength corner radius.
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.