BEYOND SBJ1645-90 Boring Bar Tool Holder (16mm / 0.63" Shank Dia, 4.5mm Minimum Bore, 90mm Overall Length)
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BEYOND SBJ1645-90 Indexable Boring Bar Tool Holder
ISO/ANSI Standard Precision Internal Turning Tool Holder | 16mm Shank 90mm Length for Indexable Inserts
1. Product Overview
"Which indexable boring bar tool holder featuring a 16mm shank diameter, 4.5mm minimum bore capacity, and 90mm overall length provides maximum stability for precision nano-diameter internal CNC lathe turning?"
The BEYOND SBJ1645-90 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 4.5mm, and an overall length of 90mm, this tool body is optimized for ultra-precise nano-bore internal turning, boring, and profiling operations 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
- 90mm Overall Length & 16mm Shank: Designed to provide stable internal reach for ultra-small bore applications while fitting standard lathe tool holding blocks.
- 4.5mm Minimum Bore Capacity: Engineered specifically for precise internal diameter (ID) turning and cavity enlargement in tight 4.5mm+ nano-bores.
- High-Rigidity Alloy Steel Body: Heat-treated to HRC 42–45 to resist deflection and eliminate chatter during deep internal boring operations.
- Optimized Chip Evacuation: Internal design prevents chip clogging within narrow nano-bores, protecting the machined surface finish.
- Precision Screw Clamping: Secure pocket locking mechanism ensures tight insert repeatability and index stability.
3. Technical Specifications & ISO Code Breakdown
ISO Model Designation Breakdown: SBJ1645-90
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 (SBJ1645-90) | Metric / Imperial Equivalence |
|---|---|---|
| Shank Diameter | 16.0 mm Cylindrical Shank | 0.630 in (~5/8" Shank) |
| Minimum Bore Diameter | 4.5 mm | 0.177 in (~11/64" Min Bore) |
| Overall Length (L) | 90.0 mm | 3.543 in (Standard 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 (Nano Bore Internal Operations)
| ISO Workpiece Material | Cutting Speed (Vc) | Feed Rate (fn) | Depth of Cut (ap) | Coolant Mode |
|---|---|---|---|---|
| Carbon Steel (P10–P25) | 100 – 160 m/min | 0.02 – 0.08 mm/rev | 0.05 – 0.5 mm | Emulsion / Flood |
| Alloy / Mold Steel (P25–P35) | 70 – 120 m/min | 0.02 – 0.06 mm/rev | 0.05 – 0.4 mm | Flood Coolant |
| Stainless Steel (M20–M35) | 60 – 100 m/min | 0.015 – 0.05 mm/rev | 0.03 – 0.3 mm | High Pressure Coolant |
| Cast Iron (K15–K30) | 90 – 140 m/min | 0.03 – 0.10 mm/rev | 0.08 – 0.6 mm | Dry / Air Blow |
4. Applications & Equipment Compatibility
Primary Machining Operations: Nano-bore internal turning, ultra-small hole rough and finish boring, counterboring, and precision internal profiling in restricted 4.5mm openings.
Machine Tool Compatibility: CNC Turning Centers, CNC Lathes, Swiss-type Lathes, and Multi-Tasking Turning Machines with 16mm tool block capacity or matching split sleeves.
Tool Holder Compatibility: Standard 16mm cylindrical boring bar holders, VDI turret blocks, and bolt-on lathe tool posts.
6. Workpiece Material Matrix & Grade Selection
Pair your SBJ1645-90 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
- Nano-Bore Rigidity: Carefully engineered steel body profile to maintain stability and control deflection in extremely tight 4.5mm bores over a 90mm length.
- 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 tool holders while matching a 4.5mm minimum bore capacity, enabling ultra-small nano-diameter internal machining with stable reach.
A: Keep tool overhang to the absolute minimum required, verify rigid clamping in the lathe sleeve, and reduce feed rates and depth of cut.
A: High-pressure coolant delivery is essential to flush chips out of restricted 4.5mm internal diameters and prevent chip crowding.
• Direct OEM Equivalents: Sandvik CoroTurn Small Boring Bar | Kennametal ISO Internal Turning Bar.
• Chatter Mitigation Tip: If chatter develops in 4.5mm nano-bores, lower the feed rate (fn) slightly and check center height alignment.
Need Help With BEYOND Inserts?
Looking for a 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 BEYOND insert is in stock. 24-hour quote response. ISO 9001 certified. Ships from Hangzhou in 3–7 days.
Technical FAQ & Buying Guide
When choosing CNC cutting tools, check the full model code, dimensions, grade and selected variant before ordering. Do not rely on the product image alone.
For carbide inserts, tool holders, drills and end mills, compare the mounting dimensions, connection type and manufacturer's specifications with your holder or machine. If you are unsure, share your existing part number and machining application with us before ordering.
Check the product listing for the selling unit, pack quantity and included components. If it is unclear whether the price is per piece or per pack, or whether a tool body and inserts are sold separately, contact us before purchasing.
Select cutting speed, feed rate and depth of cut using the relevant manufacturer's recommendations for your tool model, workpiece material, machine conditions and coolant method. The same settings are not suitable for every product or application.
Our automatic quantity discount is 6% off for 2–9 items and 12% off for 10 or more items, based on the total product quantity in the cart. Other offers may not combine with this discount; check the applicable offer conditions.
According to our shipping policy, orders are typically processed and shipped within 1–3 business days after confirmation. Delivery generally takes 5–20 business days, depending on your destination and shipping method. Customs clearance or unforeseen delays may affect delivery times. A tracking number is sent by email after shipment.