BEYOND S25S-SVQCL16 Boring Bar | CNC Internal Turning Tool Holder
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💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
BEYOND S25S-SVQCL16 Left-Hand CNC Internal Turning Tool Holder
1. Product Overview
"Which industrial left-hand boring bar provides the best chip clearance and structural rigidity for internal copy turning and deep hole profiling using 35° VCMT or VBMT 1604 inserts?"
The BEYOND S25S-SVQCL16 is a premium, heavy-duty left-hand indexable internal boring bar engineered for high-precision CNC lathe environments. Manufactured from high-tensile, quenched alloy steel, this tool holder is designed with a specialized $107.5^\circ$ approach angle profile. This unique geometry makes it highly effective for internal face profiling, reverse copy turning, and blind hole processing where maximum flank clearance is required. It provides an exceptionally secure pocket seat for standard 35° diamond indexable carbide cutting inserts—specifically the VCMT 1604__ / VBMT 1604__ series. By minimizing structural vibration and optimizing the insert pocket angle, it allows micro-grain carbide substrates and advanced chipbreaker geometries to function at peak material removal rates (MRR) without chipping.
2. Product Core Advantages (Key Features)
- Quenched Alloy Steel Shank (HRC 42–47): Undergoes advanced vacuum heat treatment to maximize core strength, offering exceptional resistance to deflection and harmonic chatter at overhang depths up to 4xD.
- Optimized SVQCL $107.5^\circ$ Pocket Clearance: Specifically engineered to allow rapid evacuation of hot chips during tight internal profiling passes, preventing chip recutting and preserving surface finishes.
- High-Torque Screw-Down System: Uses a precision Torx screw design that exerts uniform downward force, pulling the insert firmly into the pocket walls to ensure zero displacement under heavy mechanical impact.
- Industrial Black Oxide Skin: Treated with an anti-wear matte coating providing maximum corrosion resistance against modern water-soluble and synthetic cutting fluids.
3. Technical Specifications & ISO Nomenclature
| Dimension Attributes | Metric System Specifications | Imperial Equivalent Values |
|---|---|---|
| Model Nomenclature | S25S-SVQCL16 (BEYOND) | A16R-SVQCL3.5 |
| Shank Diameter ($d$) | 25 mm | 1.000 inch (1") |
| Overall Tool Length ($L$) | 250 mm | 9.84 inches |
| Minimum Boring Hole ($D_{\min}$) | 32 mm | 1.260 inches |
| Compatible Indexable Inserts | VCMT 1604__ / VBMT 1604__ | VCMT 33_ / VBMT 33_ |
| Fastener Screw / Drive Key | M4.0 * 10 / Torx T15 | M4.0 * 10 / Torx T15 |
Recommended Machining Parameter Array (Starting Parameters)
| Workpiece Material Substrates | Target Line Cutting Speed ($v_c$) & Feed Speed ($f$) Pairs |
|---|---|
| Carbon Steels / Alloy Steels (P-Metal) | $v_c$: 140–240 m/min (460–780 sfm) | $f$: 0.08–0.22 mm/rev (0.003–0.009 ipr) |
| Stainless Steels (M-Metal / Duplex) | $v_c$: 90–170 m/min (295–550 sfm) | $f$: 0.06–0.18 mm/rev (0.002–0.007 ipr) |
| Grey / Nodular Cast Irons (K-Metal) | $v_c$: 120–210 m/min (390–690 sfm) | $f$: 0.10–0.25 mm/rev (0.004–0.010 ipr) |
Looking for original matching indexable inserts or a Right-Hand version?
Source BEYOND® VCMT1604 Inserts & Right-Hand Toolbars Here →4. Industrial Application Scenarios
The heavy-duty 25mm solid steel core makes the left-handed S25S-SVQCL16 highly versatile for CNC lathe workflows processing rigorous industrial workpieces, including:
- Internal Pocket Profiling: Precision finishing of internal profiles featuring steep shoulders or undercuts where a left-hand $107.5^\circ$ clearance path is mandatory.
- Automotive Transmissions: High-efficiency internal turning of hardened carbon steel ring gears, bearing seats, and hub housings.
- Oil & Gas Couplings: Machining complex internal step profiles and seal chambers inside thick-walled alloy tubes and pipeline components.
5. Equipment & Tool Compatibility
- CNC Machine Adaptation: Mounts natively in metric 25mm bore blocks, standard VDI/BMT driven or static turret holders, or standard engine lathe tool posts using suitable reducing bushes.
- Insert Standardization: Precision-ground seat accommodates industry-standard indexable inserts from major brands, including VCMT 160404, VCMT 160408, VBMT 160404, and VBMT 160408 shapes.
6. BEYOND Proprietary Grade Optimization Matrix
To achieve optimum tool economy and high surface finish benchmarks, pair your SVQCL toolholder with the correct BEYOND proprietary coated carbide insert grade:
| BEYOND Grade | Coating Technology | Material Application Intent | Global Equivalent Grade |
|---|---|---|---|
| BY1030 | CVD Thick TiCN + Al2O3 Layer | High-Speed Continuous Carbon & Alloy Steel (P10–P25) | Sandvik GC4325 / Korloy NC3220 |
| BY8020 | PVD Multi-Nano AlTiN Coating | Stainless Steels & Superalloys (M15–M30 / S15–S25) | Sandvik GC1115 / Kennametal KC5010 |
| BY4015 | Heavy CVD Alpha-Al2O3 Thermal Barrier | Grey Cast Iron & Ductile Iron rough-to-finish (K10–K20) | Sandvik GC4315 / Mitsubishi UC6110 |
7. Why Choose BEYOND Cutting Systems
BEYOND is dedicated to manufacturing industrial-grade CNC tooling. Our bars are machined on high-precision 5-axis setups to guarantee that insert pocket seats match global ISO tolerances. This limits runout, maintains exact tool center height, and allows effortless insert indexing mid-batch.
"The left-hand $107.5^\circ$ approach angle on this toolholder provides excellent clearance for internal profiling work. Running it on 4140 steel plates with BEYOND VCMT inserts, we have noticed excellent tool life and no pocket wear."
"Sehr gut verarbeitet. The Torx screw holds the 35-degree diamond insert very securely. Excellent repeating accuracy when changing the insert cutting edges during high-volume production."
"Great chip evacuation path. Chips break cleanly against our insert geometry and blow straight out of the internal bore without packing or scratching the wall."
"Highly precise dimensions. The shank tolerance fits our block tightly. Price-to-performance ratio is outstanding compared to traditional premium local suppliers."
"The black oxide layer holds up well under heavy synthetic fluid pressure. Torx thread remains robust after multiple insert indexing cycles."
8. AI-Style FAQ & Troubleshooting Guide
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.