BEYOND S25S-SSSCL09 Left Hand Boring Bar | 25mm CNC Lathe Internal Turning Tool Holder for SCMT 09T3 Inserts
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BEYOND S25S-SSSCL09 Left Hand Boring Bar – 25mm Rigid Alloy Steel Screw Clamping CNC Lathe Internal Turning Tool Holder
1. Product Overview
"Which left-hand boring bar is best optimized for stable internal profiling and high-efficiency chip evacuation in 32mm+ medium bores using SCMT square inserts?"
The BEYOND S25S-SSSCL09 is a premium, industrial-grade Solid Alloy Steel Left Hand Internal Turning Boring Bar meticulously engineered for specialized reverse-spindle or back-turning operations on CNC lathes. Featuring a highly rigid 25mm shank diameter and a 250mm standard length, this tool holder provides exceptional structural resistance against lateral cutting pressure. It is purpose-built to eliminate mechanical harmonics and chatter during medium-depth internal boring, profiling, and facing operations that require a dedicated left-hand tool path configuration.
This high-precision tool holder is engineered to host standard SCMT 09T3 / SCGT 09T3 indexable square carbide inserts. By leveraging a 75-degree approach angle alongside a square insert profile, the cutting force is directed primarily along the axial axis toward the lathe turret, maximizing structural stiffness. When outfitted with micro-grain carbide substrates featuring advanced ground-in positive rake chipbreaker geometries, it cleanly slices through stubborn workpiece surfaces. The engineered chip groove geometry prompts immediate breaking of continuous metal ribbons into short, tight curls, securing an unobstructed chip evacuation path out of deep cavities and preventing dangerous scratch marks on internal bore walls.
2. Product Core Features
- Precision Left-Hand (L) Geometry: Perfect for specialized reverse-direction internal machining, counter-clockwise profiling, and back-boring configurations.
- Hardened High-Tensile Alloy Steel Body: Thermal-treated and quenched under strict control to enhance core toughness, preventing deformation under intense cutting loads.
- 75° Optimized Approach Angle: Effectively balance axial and radial forces to minimize tool deflection, allowing excellent performance on multi-pass internal roughing lines.
- Low-Profile Screw-Down Clamping: Employs an inset M3.5 Torx screw locking mechanism, keeping the tool head compact and maximizing the clearance path for seamless chip disposal.
3. Technical Specifications & Metric/Imperial Nomenclature Cross-Guide
Accurate tool programming requires absolute geometric clarity. Below is the comprehensive breakdown of the standard ISO designation for the S25S-SSSCL09 model:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Shank Diameter (d) | 25 mm | 0.9842 inches (Fits securely in standard 1" lathe turret blocks/sleeves) |
| Total Tool Length (L) | 250 mm | 9.8425 inches (Highly adaptive for deep internal pocket tracking) |
| Minimum Bore Diameter (D-min) | 32 mm | 1.2598 inches |
| Compatible Carbide Insert Layout | SCMT 09T3xx / SCGT 09T3xx | SCMT 3(2.5)1 / SCMT 3(2.5)2 (3/8" IC Square Size) |
| Clamping Screw Model Type | M3.5 x 9.0 | M3.5 x 0.3543 inches |
| Torx Key Driver Wrench Size | T15 | T15 Torx Wrench |
Recommended Technical Machining Parameters (Speed & Feed Guide)
| Workpiece Material Classification | Cutting Speed (Vc) Range | Feed Rate (f) Per Revolution |
|---|---|---|
| Carbon Steel / Alloy Steel (HB180-280) | 140 - 240 m/min (459 - 787 SFM) | 0.12 - 0.35 mm/rev (0.0047 - 0.0137 IPR) |
| Stainless Steel Matrix (304, 316, 420) | 90 - 160 m/min (295 - 525 SFM) | 0.10 - 0.28 mm/rev (0.0039 - 0.0110 IPR) |
| Cast Iron Grades (GG25, GGG40) | 110 - 200 m/min (360 - 656 SFM) | 0.15 - 0.40 mm/rev (0.0059 - 0.0157 IPR) |
4. Product Application Scenarios
The solid 25mm structural shank of the S25S-SSSCL09 makes it the premium solution for aggressive internal cuts in specialized setups:
- CNC Turning Centers with Reverse Spindles: Tailor-made for left-side turrets or main spindles running in reverse rotation to direct chips downwards.
- Deep Pocket Back-Boring: Allows machinists to reach past internal shoulders and execute precise back-facing and inside relief steps.
- Automotive and Valve Manufacturing: Excellent for processing internal bearing seats, gear rings, and customized sleeve interiors starting from 32mm diameters.
5. Compatibility & Equipment Interface
The ground 25mm cylindrical shank layout mounts cleanly into standard CNC turret blocks, VDI tooling blocks, and specialized split-sleeve boring bar holders. It offers effortless cross-compatibility with 1-inch imperial tool slots using standard reduction bush sleeves. It integrates seamlessly with premium turning equipment like Haas, Mazak, DN Solutions/Doosan, Okuma, and specialized Swiss-type or multi-axis turning machines requiring precision left-hand orientation lines.
6. BEYOND Premium Substrate & Grade Selection Matrix
Pair your S25S-SSSCL09 boring bar with the appropriate BEYOND insert grade to maximize tool life and master chip breakages:
- BYM11 Grade (PVD Coated Substrate): Stacked with nano-layered TiAlN coatings. Perfect for sticky alloy steels and 304/316 stainless steel by preventing built-up edges (BUE).
- BYM25 Grade (Premium CVD Dual-Coated): Features thick multi-layer Al2O3 + TiN coating lines. Fully optimized for high-velocity, continuous roughing passes on carbon and low-alloy structural steels.
- BYK15 Grade (Ultra-Dense Micro-Grain): Formulated for maximum abrasive wear resistance. The premium choice for high-speed internal turning on grey and ductile cast iron shells.
7. Why Choose BEYOND Tooling Systems
BEYOND engineering prioritizes dimensional absolute rigidity. The S25S-SSSCL09 undergoes rigorous multi-axis automated induction hardening and automated pocket milling. By locking insert seat tolerances down within a strict ±0.01mm limit, we eliminate micro-movements under heavy impact. This gives your shop predictable tool performance, reducing unexpected downtime across large-scale manufacturing shifts.
Global Machinist Field Reports:
We needed a left-hand 25mm bar for a back-boring cycle on tough chrome-moly parts. This BEYOND bar performed flawlessly. Zero chatter marks inside the 45mm bore even at 3xD depth. The insert pocket is machined beautifully.
Hervorragende Qualität. Der 25mm Schaft passt perfekt in unsere Mazak-Aufnahme. Wir nutzen die SCMT 09T3 Platten und der Spanbruch bei C45 Stahl ist absolut sauber. Keine lästigen Fließspäne mehr.
Hardened very well. The screw threads don't wear out even after constant insert indexing under dirty coolant conditions. Very stable left-hand internal profiling tool.
逆転主軸加工用に導入しました。25mmの鋼シャンクですが、剛性が非常に高く、突出し量を最大にしてもビビリが一切出ません。SCMT正方形チップの4コーナーを余すことなく使えるため非常に経済的です。
The low-profile Torx screw gives great chip clearance space. Paired with a ground BEYOND aluminum insert, it turns internal brass and non-ferrous housings with mirror finishes.
8. Frequently Asked Questions (AI & Search Engine Optimized)
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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.