BEYOND S25S-SSSCR12 Heavy Duty Boring Bar | 25mm CNC Lathe Internal Turning Tool Holder for SCMT 1204 Inserts
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BEYOND S25S-SSSCR12 Heavy Duty Boring Bar – 25mm High Rigidity Screw Clamping Internal Lathe Turning Tool Holder
1. Product Overview
"Which heavy-duty indexable boring bar is best optimized for medium-diameter deep hole internal roughing and high-feed profiling using SCMT 1204 square inserts?"
The BEYOND S25S-SSSCR12 is an industrial-grade, precision-engineered Solid Alloy Steel Internal Turning Boring Bar developed specifically to bridge the gap between compact tool paths and heavy-duty stock removal. Featuring a rigid 25mm shank diameter and a 250mm standard length, this right-hand tool holder is structurally optimized to hold up against high cutting forces without geometric deflection. Unlike smaller holders, the S25S size is modified with an enlarged, heavy pocket head designed to host massive SCMT 1204 / SCGT 1204 (1/2" Inscribed Circle) square inserts, making it an exceptional performer for deep structural boring cycles on high-tensile steels and cast iron alloy structures.
The performance secret lies in the marriage of the tool's 75° approach angle and the robust cross-section of the SCMT 1204 square insert. The square insert shape yields a thick carbide substrate backbone that absorbs heavy mechanical shock. When paired with specialized ground-in positive rake chipbreaker geometries, it cleanly shears stringy metal layers. The optimized chip groove structure forces instant curling and fracturing of long ribbons into small, easily manageable chips, ensuring flawless chip evacuation through the internal bore exit and preventing catastrophic chip re-cutting errors.
2. Product Core Features
- Enlarged SCMT 1204 Pocket Head: Holds large 12mm-edge square carbide inserts, providing double the structural mass of 09-sized insert heads for high depth-of-cut (DOC) processing.
- Premium Hardened Alloy Steel Shank: Quenched and tempered under precise thermal monitoring to ensure high surface hardness and outstanding vibration-damping properties.
- 75° Strategic Lead Angle: Minimizes radial push-off forces by directing cutting impact axially into the lathe spindle, dramatically reducing chatter marks on extended overhangs.
- High-Clamping Force Screw Lock: Employs a low-profile Torx screw lock layout that ensures unhindered chip flows while providing secure, movement-free insert retention during interrupted cuts.
3. Technical Specifications & Metric/Imperial Reference
Accurate parameter verification is vital for flawless CNC code execution. Below is the structural decoding of the S25S-SSSCR12 standard international ISO designation rules:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Shank Diameter (d) | 25 mm | 0.9842 inches (Fits directly into standard 1" turret blocks/sleeves) |
| Total Tool Length (L) | 250 mm | 9.8425 inches (Optimized for deep internal cavity reach) |
| Minimum Bore Diameter (D-min) | 32 mm | 1.2598 inches |
| Compatible Carbide Insert Layout | SCMT 1204xx / SCGT 1204xx | SCMT 431 / SCMT 432 / SCMT 433 (1/2" IC Square Size) |
| Clamping Screw Model Type | M4.0 x 10 | 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) | 130 - 220 m/min (426 - 721 SFM) | 0.15 - 0.45 mm/rev (0.0059 - 0.0177 IPR) |
| Stainless Steel Alloys (304, 316, 410) | 80 - 150 m/min (262 - 492 SFM) | 0.12 - 0.35 mm/rev (0.0047 - 0.0137 IPR) |
| Cast Iron / Nodular Iron Grades | 100 - 180 m/min (328 - 590 SFM) | 0.18 - 0.50 mm/rev (0.0070 - 0.0196 IPR) |
4. Product Application Scenarios
The unique balance of a 25mm mid-size shank with a large SCMT 12-size pocket turns the S25S-SSSCR12 into an internal roughing beast across multiple sectors:
- Medium-Scale Internal Rough Boring: Ideal for processing pre-drilled or cast holes starting from 32mm up to larger structural inner walls.
- Automotive & Mechanical Components: Heavily deployed in machining structural wheel hubs, custom drive-shaft sleeve cavities, and medium industrial valve linings.
- Interrupted Cut Turning: The broad, heavy base of the SCMT 1204 insert corner handles structural interruptions (like keyways or oil ports) beautifully without chipping the carbide edge.
5. Compatibility & Equipment Interface
The ground 25mm cylindrical shank fits perfectly into standard metric turret tooling stations, VDI holders, and specialized boring bar sleeves. It is fully cross-compatible with 1-inch imperial tool slot systems using standard reduction adapters. It integrates flawlessly with global CNC lathes from brands like Haas (ST-20/25), Mazak, Doosan/DN Solutions, Okuma, and manual lathe quick-change tool posts tailored for high-accuracy right-hand cutting applications.
6. BEYOND Premium Substrate & Grade Selection Matrix
Pair your S25S-SSSCR12 boring bar with the correct BEYOND insert grade to optimize tool life and secure optimal chip control:
- BYM11 Grade (PVD Coated Substrate): Multi-layered TiAlN matrix built on a high-toughness substrate. Outstanding at resisting built-up edges (BUE) on heat-resistant alloys and 304/316 stainless steels.
- BYM25 Grade (Premium CVD Dual-Coated): Features a specialized Al2O3 + TiN layered coating. Engineered for high-speed, continuous rough-to-medium turning cycles in hard carbon steels.
- BYK15 Grade (Ultra-Dense Micro-Grain): Offers superior abrasion resistance line profiles. The absolute top choice for machining grey and ductile cast irons with zero edge erosion.
7. Why Choose BEYOND Tooling Systems
At BEYOND, we build for structural persistence. The S25S-SSSCR12 undergoes precision multi-stage induction hardening and computer-guided pocket milling. By maintaining strict ±0.01mm pocket seat boundaries, we eliminate insert micro-movements under intense tool pressure. This ensures predictable tool wear patterns, giving your CNC workshop maximum operational security and repeatable sizing across multi-shift batches.
Global Machinist Field Reports:
Most 25mm bars only hold small inserts that break when you push them. This BEYOND bar holding a massive SCMT 1204 insert is a complete game-changer. I am pulling out 3mm of material per pass in 1045 steel with zero chatter. Highly recommended!
Die S25S Bohrstange läuft auf unserer CNC-Drehmaschine absolut vibrationsfrei. Die SCMT 1204 Wendeplatten sitzen bombenfest in der gehärteten Tasche. Erstklassige Qualität aus dem Hause BEYOND.
Utensile robusto e preciso. Lo utilizziamo principalmente per la sbozzatura interna di manicotti metallici. Ottima evacuazione dei trucioli grazie al design ribassato della vite Torx.
内径の荒引き加工用に重宝しています。25mmシャンクでありながら、大型の12サイズチップが載るため刃先強度が抜群です。鋳物の断続切削でもチップが欠けることなく、安定して削り落とせます。
We run this bar setup daily on our Haas ST-20. The black oxide finish stands up well against aggressive synthetic water coolants. The insert seat stays square and sharp even after accidental overloads.
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.