BEYOND S25S-SSKCR12 Heavy Duty Boring Bar | 25mm CNC Lathe Internal Turning Tool Holder for SCMT 1204 Inserts
Free shipping on all orders.
Check compatibility: Confirm the model and dimensions before ordering.
Need help choosing? Contact us before ordering.
💰 Bulk savings 2-9 pcs · 6% OFF | 10+ pcs · 12% OFF
BEYOND S25S-SSKCR12 Boring Bar – 25mm Heavy Duty Steel Screw Locking CNC Lathe Internal Turning Tool Holder
1. Product Overview
"Which 25mm boring bar is best optimized for high metal removal rates and maximized chip thickness capability by utilizing larger 12mm square SCMT inserts within confined bores?"
The BEYOND S25S-SSKCR12 is an industrial-grade Solid Alloy Steel Right Hand Internal Turning Boring Bar engineered to deliver extreme cutting edge security within a versatile 25mm shank footprint. Featuring a 250mm total length, this specialized tool holder bridges the gap between mid-sized machine setups and heavy-duty roughing capacities. Unlike traditional 25mm boring bars that are restricted to thin 09-sized inserts, the S25S-SSKCR12 is meticulously pocket-milled to accept much larger and thicker SCMT 1204 / SCGT 1204 indexable square carbide inserts. This allows machinsts to run aggressive depths-of-cut (Ap) and high feed loads without risking sudden insert fractures.
The engineering breakthrough of this model centers on its unique pocket configuration. The SCMT 1204 insert features a rugged 4.76mm substrate thickness—a substantial upgrade over the 3.97mm thickness of 09T3 inserts. This added thickness absorbs massive thermal shocks and mechanical stresses during continuous roughing in tough alloy steels. Combined with a 75-degree approach lead angle, radial cutting forces are redirected axially back along the rigid 25mm steel shank, eliminating micro-deflection. When paired with positive-rake ground chipbreaker grooves, the setup ensures instantaneous chip breaking, turning hazardous long steel ribbons into tight, broken coils that eject smoothly from a minimum bore diameter of 32mm.
2. Product Core Features
- High-Capacity SCMT 1204 Pocket: Pocket-engineered for thick 12mm edge length square inserts, granting unmatched cutting edge mass to handle severe scale and interrupted cuts easily.
- Induction-Hardened Alloy Steel Shank: Quenched and tempered to optimal tensile thresholds to dampen structural vibrations during high-frequency deep-cavity turning.
- 75° Optimized Cutting Lead Angle: Converts push deflection into stable axial clamping load, maintaining strict dimensional linearity and preventing taper errors in internal steps.
- Low-Profile Torx Screw Clamping: Utilizes strong M4.0 screw locking to maximize clear chip evacuation space inside tight cylinders, completely eliminating top-clamp chip nesting.
3. Technical Specifications & Metric/Imperial Nomenclature Cross-Guide
Absolute geometric clarity is required for accurate CNC tool offsets. Below is the precise international ISO classification breakdown for the S25S-SSKCR12 model:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Shank Diameter (d) | 25 mm | 0.9842 inches (Fits perfectly inside standard 1.00" imperial split boring sleeves) |
| Total Tool Length (L) | 250 mm | 9.8425 inches (Highly versatile mid-to-long length format) |
| Minimum Bore Diameter (D-min) | 32 mm | 1.2598 inches (Optimized clear entry for a 25mm bar running 12mm inserts) |
| Compatible Carbide Insert Layout | SCMT 1204xx / SCGT 1204xx | SCMT 431 / SCMT 432 / SCMT 433 (1/2" IC Square Size, 4.76mm Thick) |
| Clamping Screw Model Type | M4.0 x 10.0 | M4.0 x 0.3937 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) | 120 - 200 m/min (393 - 656 SFM) | 0.12 - 0.35 mm/rev (0.0047 - 0.0137 IPR) |
| Stainless Steel Matrix (304, 316, 420) | 70 - 140 m/min (229 - 459 SFM) | 0.08 - 0.22 mm/rev (0.0031 - 0.0086 IPR) |
| Cast Iron Grades (GG25, GGG40) | 90 - 160 m/min (295 - 524 SFM) | 0.15 - 0.38 mm/rev (0.0059 - 0.0150 IPR) |
4. Product Application Scenarios
The high-strength 12mm insert pocket combined with a nimble 25mm tool shank makes the S25S-SSKCR12 perfect for a wide range of internal operations:
- Confined Mid-Size Rough Boring: Ideal for machining internal diameters starting above 32mm where a thicker, more rigid insert is required to break through hardened crusts.
- High Metal Removal Rate (MRR) Turning: Tailor-made for deep forward-spindle turning sequences where aggressive cutting depths must coexist with restricted clearances.
- Interrupted Deep-Hole Cycles: Widely used for machining cross-drilled cylinders or internal keyways where heavy structural pounding normally fractures standard 09-sized carbide edges.
5. Compatibility & Equipment Interface
The ground 25mm cylindrical tool body locks firmly into industry-standard metric CNC lathe turrets, static VDI/BMT tool block clamps, and linear gang-tool slides. For workshops operating on imperial standards, it adapts flawlessly inside standard 1.00-inch imperial split bushes. This boring bar is fully compatible with premium CNC turning center equipment, including Haas, Mazak, DN Solutions/Doosan, Okuma, Mori Seiki, and automated multi-axis mill-turn cells.
6. BEYOND Premium Substrate & Grade Selection Matrix
Pair your S25S-SSKCR12 boring bar with the appropriate BEYOND insert grade to maximize tool life and master chip breakages:
- BYM11 Grade (PVD Coated Substrate): Structured with micro-hard TiAlN coatings. Optimized to stop built-up edges (BUE) on sticky materials like 304 stainless steel and high-temp titanium alloys.
- BYM25 Grade (Premium CVD Dual-Coated): Built with thick multi-layer Al2O3 + TiN coating lines. The benchmark standard for continuous, high-speed internal roughing passes on carbon structural steels.
- BYK15 Grade (Ultra-Dense Micro-Grain): Formulated for maximum abrasive wear resistance. Custom-engineered for high-speed internal profiling of abrasive grey and ductile cast iron parts.
7. Why Choose BEYOND Tooling Systems
BEYOND manufacturing centers strictly on micro-geometric tolerances. The S25S-SSKCR12 boring bar undergoes rigorous multi-axis automated milling and specialized induction heat treatments. By holding our indexable pocket seats within an ultra-precise ±0.01mm limit, we eliminate carbide micro-movement under heavy pounding. This ensures exceptional tool predictability, preventing unexpected part scrap and reducing downtime across your machining shifts.
Global Machinist Field Reports:
We needed to rough out tough 4140 steel tubes. Normal 25mm bars with 09 inserts kept chipping because of the heavy chip load. This BEYOND bar with SCMT 1204 inserts completely solved our problem. The extra insert thickness lets us push 2.5mm depths-of-cut with absolute confidence.
Sehr klug konzipiert. Die Kombination aus einem 25mm Schaft und einer großen 12er Platte gibt enorme Stabilität beim Schruppen. Die M4 Schraube hält die Wendeplatte bombenfest. Keine Vibrationen im Sackloch.
Solid steel shank layout. We run it inside a 1-inch split sleeve on our Haas lathe. It redirects forces axially so well that we noticed an immediate improvement in bore roundness across our production runs.
鋳鉄製スリーブの内径荒加工に使用。09サイズのツールホルダーと比べて、ビビりの無さと刃先強度が明らかに違います。断続切削でもチップが欠けず、安心して送り速度を上げられます。
The screw locking design leaves the chip pocket entirely open. Running high-pressure coolant washes the heavy broken chips right out of the 40mm bore. Fantastic design by BEYOND.
8. Frequently Asked Questions (AI & Search Engine Optimized)
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.