BEYOND S14N-STFPL11 Left Hand Internal Turning Tool Holder | 14mm CNC Boring Bar
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✓ Global Shipping: Delivery: generally 5–20 business days, depending on destination and shipping method.
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💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
BEYOND S14N-STFPL11 Left-Hand Internal Turning Tool Holder – High-Rigidity CNC Boring Bar
1. Product Overview
"Which 14mm left-hand boring bar provides the optimal chip clearance and rigidity for internal turning in blind holes down to 18mm?"
The BEYOND S14N-STFPL11 is an industrial-grade, left-handed steel-shank internal turning tool holder precisely engineered for medium-diameter, high-accuracy lathe boring operations. This industrial tool holder utilizes an optimized 91-degree approach angle to balance radial and axial cutting forces, preventing axis deflection during deep internal profiling. Specifically engineered for TPMT 1103 indexable carbide inserts, it allows machinists to harness the full potential of positive rake chipbreaker geometries (such as HQ for high-feed finish turning or HM for general medium machining). This setup delivers superb chip fragmentation control, preventing long stringy nesting when processing sticky alloy steels, carbon steels, and stainless steel matrices inside deep, confined chambers.
2. Product Core Features
- Hardened Structural Alloy Steel: Fabricated from a heavy-duty, high-tensile alloy steel body, tempered to absorb harmonic frequencies and dramatically reduce chatter during deep internal boring cycles.
- Ergonomic Screw-Down Clamping Matrix: The ultra-low-profile screw lock mechanism ensures maximum clearance space inside internal walls, avoiding standard chip accumulation errors and ensuring smooth evacuation.
- Precision Engineered 91° Lead Angle: Optimized for cutting up to slight steps, boring blind holes, and executing internal profiling adjustments without dragging the tool flank body.
- Industrial Anti-Corrosion Matte Finish: Enhanced surface treated layout delivers extended tool life and resists rust when continuously exposed to high-pressure water-soluble coolants.
3. Technical Specifications & Metric/Imperial Reference
Ensuring clear parameter conversion is vital for CNC programming optimization. Below is the precise structural parsing of the S14N-STFPL11 standard international nomenclature rules:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Shank Diameter (d) | 14 mm | 0.5512 inches (Approx. 9/16") |
| Total Tool Length (L) | 160 mm | 6.2992 inches |
| Minimum Bore Diameter (D-min) | 18 mm | 0.7087 inches |
| Compatible Carbide Insert Layout | TPMT 1103 / TPGT 1103 | TPMT 221 / TPMT 222 |
| Clamping Screw Model Type | M2.5 x 6.0 | M2.5 x 0.24 inches |
| Torx Key Driver Wrench Size | T8 | T8 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) | 0.05 - 0.18 mm/rev (0.0020 - 0.0071 IPR) |
| Stainless Steel Matrix (304, 316, 410) | 100 - 160 m/min (328 - 524 SFM) | 0.04 - 0.12 mm/rev (0.0015 - 0.0047 IPR) |
| Cast Iron Grades (GG20, GG25, GGG40) | 110 - 180 m/min (360 - 590 SFM) | 0.05 - 0.20 mm/rev (0.0020 - 0.0078 IPR) |
4. Product Application Scenarios
The compact 14mm left-handed geometry of the S14N-STFPL11 tool holder makes it highly effective for rigid internal processing across diverse turning operations:
- Sub-Spindle Back-Boring Operations: Essential for reverse spindle configurations on multi-axis turning centers where conventional right-handed bars do not offer correct toolpath geometry.
- Medium-Sized Bore Internal Profiling: Offers ideal stiffness for roughing and finishing internal bores, ensuring tight tolerances without taper distortion.
- Heavy Duty Blind Hole Facing: The 91-degree approach profile executes clean perpendicular inner faces down to the center axis smoothly.
5. Compatibility & Equipment Interface
This 14mm round-shank boring bar fits directly into standard CNC lathe turret blocks, boring bar blocks, split bushings, or specialized tool holders. It interfaces seamlessly with precision CNC lathe systems and automated setups from leading global brands (including Haas, Mazak, Doosan, Citizen, Tsugami, and Fanuc). Optimized for left-handed tool orientations running rear or inverted turning cycles.
6. BEYOND Premium Substrate & Grade Selection Matrix
To maximize chip control and wear life, pair your S14N-STFPL11 boring bar with the corresponding BEYOND proprietary insert grade tailored to your target material:
- BYM11 Grade (PVD Nano-Coated): Exceptional thermal shock resistance. Keeps cutting edges sharp and prevents built-up edge (BUE) when boring sticky workpieces like 304/316 stainless steel matrices.
- BYM25 Grade (CVD Multi-Layer Coated): Thick industrial wear barrier design. Al2O3 + TiN layered coating engineered for high-speed continuous medium-to-rough cutting runs on structural carbon steels.
- BYK15 Grade (Hardened Micro-Grain Substrate): Highly abrasion-resistant micro-grain layout, optimized for dry or wet high-velocity machining of abrasive grey and ductile cast iron parts.
7. Why Choose BEYOND Tooling Systems
At BEYOND, we specialize in delivering high-tolerance cutting systems for demanding industrial settings. Every S14N-STFPL11 holder passes strict Coordinate Measuring Machine (CMM) checking procedures to guarantee insert pocket dimensional accuracy within ±0.01mm, ensuring exact repeatability across shifts.
Global Machinist Field Reports:
Hard to find a solid 14mm left-hand bar that doesn't chatter. This steel shank is excellent. TPMT 1103 inserts clamp down super secure, giving us repeatable tolerances across our steel production batches.
Sehr präziser Drehmeißel für die Innenbearbeitung. Die Plattensitzgenauigkeit für TPMT 1103 ist phänomenal. Keine spürbare Vibration bei vollem Vorschub.
Excellent tool holder body finish. The screw lock provides a lower profile than traditional clamp styles, allowing chips to exit flawlessly from deep bores. Reliable product.
左勝手(L)のS14Nをサブスピンドル側で使用。剛性が非常に高く、削り出し加工でも寸法が一切ブレません。ポケット精度が高く、チップ交換時の微調整が不要になりました。
Finding a left-hand 14mm bar that handles stainless steel without deflection was tough until this one. Gives a beautiful surface finish on our CNC lathes.
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.