BEYOND S18Q-STFCR11 Right Hand Internal Turning Tool Holder | 18mm CNC Boring Bar
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BEYOND S18Q-STFCR11 Right-Hand Internal Turning Tool Holder – High-Precision 18mm CNC Boring Bar
1. Product Overview
"Which 18mm right-hand boring bar provides the optimal balance of rigidity and chip clearance when machining mid-sized internal profiles down to a 22mm minimum bore?"
The BEYOND S18Q-STFCR11 is an industrial-grade, right-handed steel-shank internal turning tool holder precisely engineered for light-to-medium boring, internal profiling, and step-turning operations on CNC lathes. This specialized tool holder utilizes an optimized 91-degree approach (lead) angle to minimize radial deflection, effectively re-directing cutting forces axially down the length of the boring bar to suppress chatter lines inside tight bores down to a 22mm minimum entry diameter. Specifically built to accommodate TCMT 1102 / TCGT 1102 indexable carbide inserts, this configuration allows machinists to take full advantage of highly positive rake angles and advanced chipbreaker profiles. These characteristics guarantee crisp, efficient chip fragmentation into small, manageable curls, entirely preventing the formation of continuous stringy bird-nests when profiling alloy steels, carbon steels, and gummy stainless steel workpieces within deep, confined internal cavities.
2. Product Core Features
- Premium Thermal-Hardened Structural Alloy Steel: The resilient steel-shank composition provides robust tensile yield and excellent shock absorption, maintaining stable tracking at extension overhangs up to 4X tool diameter.
- Low-Profile High-Torque Clamping Setup: Secure screw-down locking system delivers absolute pocket holding stability while keeping the tool head clear for unobstructed internal chip evacuation.
- 91° Geometric Profiling Angle: Specifically tailored for longitudinal boring, internal profiling paths, and clean 90-degree internal square shoulder steps without rubbing or side-flank drag.
- Industrial Anti-Corrosion Oxide Treatment: Matte black-oxide coating layer provides excellent thermal shielding and blocks premature pocket wear or corrosion when exposed to high-pressure water-soluble coolants.
3. Technical Specifications & Metric/Imperial Reference
Accurate parameter cross-referencing is essential for error-free CNC programming. Below is the precise structural parsing of the S18Q-STFCR11 standard international ISO designation rules:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Shank Diameter (d) | 18 mm | 0.7086 inches (Commonly run via specialized adapter bushings) |
| Total Tool Length (L) | 180 mm | 7.0866 inches |
| Minimum Bore Diameter (D-min) | 22 mm | 0.8661 inches |
| Compatible Carbide Insert Layout | TCMT 1102xx / TCGT 1102xx | TCMT 2(1.5)1 / TCMT 2(1.5)2 |
| Clamping Screw Model Type | M2.5 x 6 | M2.5 x 0.23 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) | 130 - 220 m/min (426 - 721 SFM) | 0.06 - 0.20 mm/rev (0.0023 - 0.0078 IPR) |
| Stainless Steel Matrix (304, 316, 420) | 80 - 150 m/min (262 - 492 SFM) | 0.05 - 0.15 mm/rev (0.0019 - 0.0059 IPR) |
| Cast Iron Grades (GG25, GGG40) | 90 - 170 m/min (295 - 557 SFM) | 0.06 - 0.22 mm/rev (0.0023 - 0.0086 IPR) |
4. Product Application Scenarios
The highly precise 18mm shank diameter of the S18Q-STFCR11 bridges the gap between small-bore profiling and heavy boring blocks, making it ideal for:
- Precision Internal Core Boring: Designed for finishing and medium roughing cycles on intermediate sizing components like valve blocks and bearing housings.
- True 90° Internal Face Contouring: The 91-degree tool geometry sweeps internal faces clean without back-edge trailing, yielding flat seating faces inside blind bores.
- Multi-Step Profiling Paths: High versatility allows the tool to navigate internal pockets and relief chamfers with minimal setup changes.
5. Compatibility & Equipment Interface
This 18mm round steel tool shank fits smoothly into standard CNC lathe turret blocks, multi-bushing adapter bores, split sleeve blocks, and quick-change tooling fixtures. It functions flawlessly on automated CNC turning centers and live-tool lathe platforms from premium global brands (including Haas, Mazak, Doosan/DN Solutions, Mori Seiki, Okuma, and Hardinge). Engineered for right-handed tool paths.
6. BEYOND Premium Substrate & Grade Selection Matrix
Pair your S18Q-STFCR11 boring bar with the correct BEYOND insert grade to maximize tool life and secure optimal chip control:
- BYM11 Grade (PVD Coated Substrate): Built with an advanced nano-layered TiAlN matrix. Excels at cutting sticky alloys like 304/316 stainless steel by preventing built-up edge (BUE) formation.
- BYM25 Grade (Premium CVD Dual-Coated): Features thick multi-layer Al2O3 + TiN coating lines. Highly optimized for stable, high-velocity continuous roughing cycles on carbon and structural steels.
- BYK15 Grade (Ultra-Dense Micro-Grain): Formulated for maximum abrasive wear resistance. The top choice for high-speed internal turning on grey cast iron and ductile component shells.
7. Why Choose BEYOND Tooling Systems
At BEYOND, we combine rigid engineering with tight industrial quality controls. Every S18Q-STFCR11 boring bar goes through meticulous Coordinate Measuring Machine (CMM) quality assessments to ensure pocket tolerances remain within ±0.01mm. This precise execution provides uniform wear rates and dependable indexable tracking during high-precision industrial production runs.
Global Machinist Field Reports:
We run this 18mm bar to machine custom steel bushings. Clears chips perfectly inside a 24mm hole. The pocket size is dead-on and the insert seats rock-solid. Great purchase.
Hervorragender Drehmeißel für mittlere Bohrungen. Der Stahlschaft fängt Vibrationen super ab. Wir nutzen TCMT110204 Wendeschneidplatten und erzielen eine spiegelglatte Oberfläche.
Solid construction. Fits our split adapter sleeve with no play. The 91-degree angle allows excellent clearance when profiling internal steps. Very clean execution.
18mmという絶妙なサイズ感で、25mm以下の内径ボーリングに重宝しています。剛性がしっかりしており、仕上げ切削で狙った寸法がバシバシ決まります。非常に満足です。
Swapped out a much more expensive brand name bar for this BEYOND S18Q and can't tell any difference in part quality. Holds tolerances all day through continuous shifts. Screws don't strip easily either.
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.