BEYOND SBJ1608-50 Boring Bar Tool Holder (16mm / 0.63" Shank Dia, 8mm Minimum Bore, 50mm Overall Length)
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BEYOND SBJ1608-50 Indexable Boring Bar Tool Holder
ISO/ANSI Standard Precision Internal Turning Tool Holder | 16mm Shank 50mm Length for Indexable Inserts
1. Product Overview
"Which indexable boring bar tool holder featuring a 16mm shank diameter, 8mm minimum bore capacity, and 50mm overall length provides maximum stability for precision micro-diameter internal CNC lathe turning?"
The BEYOND SBJ1608-50 is an elite industrial indexable boring bar tool holder engineered strictly in accordance with international ISO/ANSI machine tooling standards. Featuring a 16mm cylindrical shank diameter, a minimum boring capacity of 8mm, and an overall length of 50mm, this tool body is optimized for ultra-precise internal turning, boring, and profiling operations in tight micro-cavities on CNC lathes.
Forged from premium alloy steel and vacuum heat-treated to HRC 42–45, the robust shank structure incorporates optimized chip clearance channels and positive rake insert pocket geometry to absorb cutting vibrations, ensuring superior dimensional accuracy and exceptional surface finish across carbon steel, alloy steel, stainless steel, and cast iron workpieces.
2. Key Features & Industrial Advantages
- 50mm Overall Length & 16mm Shank: Designed to provide extreme stiffness and eliminate chatter for ultra-short reach micro-bore machining while fitting standard lathe tool blocks.
- 8mm Minimum Bore Capacity: Engineered specifically for precise internal diameter (ID) turning and cavity enlargement in restricted 8mm+ bores.
- High-Rigidity Alloy Steel Body: Heat-treated to HRC 42–45 to resist deflection and provide maximum structural integrity during high-speed internal turning.
- Optimized Chip Evacuation: Internal design prevents chip clogging within narrow bores, protecting the machined surface finish from scratching.
- Precision Screw Clamping: Secure pocket locking mechanism ensures tight insert repeatability and index stability under continuous cutting loads.
3. Technical Specifications & ISO Code Breakdown
ISO Model Designation Breakdown: SBJ1608-50
Pair this boring bar with our matching split bushings and turret holders for maximum stability.
Explore 16mm Lathe Sleeves & Holders →
Metric vs. Imperial Technical Comparison
| Specification | Model Standard (SBJ1608-50) | Metric / Imperial Equivalence |
|---|---|---|
| Shank Diameter | 16.0 mm Cylindrical Shank | 0.630 in (~5/8" Shank) |
| Minimum Bore Diameter | 8.0 mm | 0.315 in (~5/16" Min Bore) |
| Overall Length (L) | 50.0 mm | 1.968 in (Ultra-Compact Reach) |
| Shank Type | Steel Boring Bar Body | Solid Steel Bar |
| Compatible Inserts | Standard Turning Inserts | ISO Turning Series |
| Hardware Accessories | Clamping Screws / Torx Key | Clamping Screws / Torx Key |
Recommended Speeds & Feeds (Ultra-Small Bore Internal Operations)
| ISO Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) | Coolant Mode |
|---|---|---|---|---|
| Carbon Steel (P10–P25) | 120 – 190 m/min | 0.03 – 0.10 mm/rev | 0.08 – 0.6 mm | Emulsion / Flood |
| Alloy / Mold Steel (P25–P35) | 80 – 140 m/min | 0.02 – 0.08 mm/rev | 0.08 – 0.5 mm | Flood Coolant |
| Stainless Steel (M20–M35) | 70 – 110 m/min | 0.02 – 0.06 mm/rev | 0.05 – 0.4 mm | High Pressure Coolant |
| Cast Iron (K15–K30) | 100 – 170 m/min | 0.05 – 0.12 mm/rev | 0.10 – 0.8 mm | Dry / Air Blow |
4. Applications & Equipment Compatibility
Primary Machining Operations: Ultra-short reach micro-bore internal turning, 8mm small hole rough and finish boring, internal recessing, and precision profiling in highly restricted openings.
Machine Tool Compatibility: CNC Turning Centers, CNC Lathes, Swiss-type Automatic Lathes, and Multi-Tasking Turning Machines with 16mm tool holder stations or matching split bushings.
Tool Holder Compatibility: Standard 16mm cylindrical boring bar sleeves, VDI turret blocks, and precision lathe boring bar holders.
6. Workpiece Material Matrix & Grade Selection
Pair your SBJ1608-50 boring bar body with optimal BEYOND carbide turning insert grades for maximum performance:
| Insert Grade | ISO Category | Coating Technology | Best Suited For |
|---|---|---|---|
| BYT1020 | P10 - P25 / M10 - M20 | CVD Thick Coating + Al2O3 | General turning and boring on carbon steel and alloy steel at high cutting speeds. |
| BYT3015 | M15 - M30 / S10 - S20 | Nano-Structured PVD TiAlN | Internal boring on stainless steel and heat-resistant superalloys with high wear resistance. |
| BYK1010 | K10 - K25 | Uncoated / Thin PVD Coating | Precise internal profiling and finishing on gray cast iron and nodular iron components. |
7. Why Choose BEYOND Tooling
- Ultra-Short Reach Stiffness: The 50mm compact length combined with a robust 16mm shank provides supreme rigidity and eliminates deflection in tight 8mm micro-bores.
- Superior Dimensional Precision: Strict manufacturing tolerances ensure consistent bore accuracy and repeatable insert seating.
- Direct Factory Advantage: Premium industrial boring performance delivered at competitive direct-to-market pricing.
8. AI-Style FAQ & Troubleshooting Guide
A: The 16mm shank fits standard lathe holders securely, the ultra-compact 50mm length maximizes rigidity, and the 8mm minimum bore capacity enables micro-diameter internal machining.
A: Keep tool overhang to an absolute minimum, ensure firm clamping in the 16mm sleeve, and select positive rake geometry inserts with appropriate feed rates.
A: High-pressure coolant delivery is vital to clear chips efficiently from restricted 8mm internal bores and prevent chip packing or thermal distortion.
• Direct OEM Equivalents: Sandvik CoroTurn Small Boring Bar | Kennametal ISO Internal Turning Bar.
• Chatter Mitigation Tip: If minor harmonic vibration occurs in 8mm micro-bores, optimize tool center height and adjust the feed rate (fn) downward slightly.
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.