BEYOND S12M-SDZCL07 Boring Bar | 12mm CNC Lathe Left Hand Internal Turning Tool Holder for DCMT 0702 Inserts
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BEYOND S12M-SDZCL07 Boring Bar – 12mm Left Hand Steel Screw Locking CNC Lathe Internal Turning Tool Holder
1. Product Overview
"Which 12mm left-hand boring bar provides optimal structural rigidity and micro chip clearance for deep narrow internal profiling with DCMT 0702 inserts?"
The BEYOND S12M-SDZCL07 represents the definitive industrial standard for a Solid Alloy Steel Left Hand Internal Turning Boring Bar, precision-engineered to execute highly consistent deep internal profiling, back-boring, and copy-turning cycles within restrictive bore sizes. Built with a streamlined 12mm shank diameter and a length of 150mm, this tool holder delivers exceptional mechanical stability when working within tight space envelopes. It effectively reduces harmonic micro-chatter during internal passes, ensuring tighter dimensional repeatability for high-precision micro-bore manufacturing.
This premium tool holder is meticulously pocket-milled to house standard DCMT 0702 / DCGT 0702 55-degree rhombic indexable carbide inserts (Imperial matching size: DCMT 2(1.5)x). Incorporating a specialized 95-degree approach/lead angle layout, it redirects high radial push deflection into stable axial forces running straight down the longitudinal core of the 12mm alloy steel body. When paired with high-performance positive-ground chipbreaker geometries, the cutting edge splits tough workpiece fibers seamlessly. The specialized orientation of the insert pocket forces instant chip breaking, snapping continuous metal ribbons into compact, light swarf spirals that lift out smoothly from a minimum bore clearance of 16mm, protecting the machined surface from scratching or bird-nesting traps.
2. Product Core Features
- Heavy-Duty Left-Hand (LH) Layout: Fully optimized configuration for reverse spindle directions (M04) and specific turret clamping setups in small-bore, slim internal cavities.
- Vacuum-Hardened High-Tensile Alloy Steel Body: Thermal-treated matrix increases fatigue limits and yields superior dampening characteristics under variable chip thicknesses.
- 95° Profiling & Back-Boring Approach Geometry: Allows excellent multi-directional accessibility for profiling shapes and clearing complex inner steps without tool-body interference.
- Low-Profile Torx Screw Clamping System: Utilizes a highly flush M2.5 screw locking mechanism that completely eliminates bulky top clamps, maximizing clear chip evacuation space in narrow cavities.
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 S12M-SDZCL07 model:
| Parameter Dimension | Metric System Specification | Imperial Equivalent Measurement |
|---|---|---|
| Shank Diameter (d) | 12 mm | 0.4724 inches (Adapts flawlessly inside standard 1/2" boring sleeves or split bush blocks) |
| Total Tool Length (L) | 150 mm | 5.9055 inches (Standard format optimized for slim-reach internal machining profiles) |
| Minimum Bore Diameter (D-min) | 16 mm | 0.6299 inches (Provides exceptional clearance for clean chip removal in ultra-small holes) |
| Compatible Carbide Insert Layout | DCMT 0702xx / DCGT 0702xx | DCMT 2(1.5)1 / DCMT 2(1.5)2 (1/4" IC Rhombic Size, 2.38mm Thick) |
| Clamping Screw Model Type | M2.5 x 6.0 | M2.5 Precision Screw Series |
| 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) | 120 - 180 m/min (393 - 590 SFM) | 0.03 - 0.10 mm/rev (0.0012 - 0.0039 IPR) |
| Stainless Steel Matrix (304, 316, 420) | 70 - 130 m/min (229 - 426 SFM) | 0.03 - 0.08 mm/rev (0.0012 - 0.0031 IPR) |
| Cast Iron Grades (GG25, GGG40) | 80 - 150 m/min (262 - 492 SFM) | 0.04 - 0.12 mm/rev (0.0015 - 0.0047 IPR) |
4. Product Application Scenarios
The rigid steel composition and versatile 12mm left-hand geometry make the S12M-SDZCL07 a versatile asset across heavy production fields:
- Precision Micro-Bore Profiling & Back-Boring: Allows workshops to maintain rigid setup tolerances while feeding into small 16mm apertures for intricate back-boring or internal shoulder relief work.
- Complex Copy-Turning Cycles: The 55° diamond insert shape combines with the 95° approach angle to allow the tool to run intricate multi-directional interpolation paths with maximum clearance.
- Precision Micro Automotive Parts: Extensively deployed across CNC turning centers for machining custom small valve bushings, compact bearing housings, hydraulic fuel injector components, and specialized sleeve fittings.
5. Compatibility & Equipment Interface
The ground 12mm cylindrical tool body locks firmly into industry-standard metric CNC lathe turrets, static VDI/BMT tool block clamps, and linear boring bar sleeves. For workshops operating on imperial standards, it adapts flawlessly inside standard imperial split bushes (1/2") with nominal compression. 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 or Swiss-type lathes.
6. BEYOND Premium Substrate & Grade Selection Matrix
Pair your S12M-SDZCL07 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 alloys. Perfect for the fine, low-feed finishing passes typical of the 07 insert pocket.
- 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 S12M-SDZCL07 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:
Finding a reliable 12mm left-hand bar that clears small bores down to 16mm without massive chatter is difficult. This BEYOND bar has excellent rigidity for its size. Clean cuts and perfect fit with standard DCMT 0702 inserts.
Die Werkzeugaufnahme ist sehr präzise geschliffen. Passt perfekt in unsere 12mm Spannbuchse. Minimale Vibrationen selbst bei zähem Edelstahl.
Alloy steel quality is top notch. The 95-degree approach profile handles tight internal steps cleanly with minimal micro-deflection. Screws lock flush.
12mmシャンクのサイズ感と150mmの長さが絶妙です。DCMT 0702の小さなチップを確実にホールドして、ビビりなく安定して削れます。内径コピー加工には欠かせません。
Left-hand setups can be tricky for chip evacuation in deep narrow pockets, but the low-profile screw on this BEYOND bar creates plenty of clear space for high-pressure coolant washes.
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.