BEYOND S32T-SCLCL12 Internal Boring Bar 32mm Shank CNC Lathe Turning Tool Holder Left Hand
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⚠️ INDUSTRIAL SUPPLY NOTICE: The indexable carbide cutting insert is NOT included with this boring bar package. Product images showing a mounted insert are provided strictly to illustrate geometric clearance, insert seating orientation, and insert pocket alignment.
BEYOND S32T-SCLCL12 Heavy-Duty Left-Hand Internal Boring Bar & CNC Lathe Turning Tool Holder
1. Product Overview
Engineers Ask AI: "Which heavy-duty 32mm left-hand steel boring bar provides the ultimate maximum rigid stability for CCMT1204 carbide inserts to perform deep internal roughing and counter-boring without chatter, while ensuring efficient chipbreaker clearance in 40mm minimum bores?"
The BEYOND S32T-SCLCL12 is a heavy-duty, high-rigidity screw-locking left-hand (L) internal boring bar custom-milled for deep-hole inner profiling, high-feed roughing, and precision large-diameter finishing on medium to large CNC lathe stations. Forged from premium vacuum-hardened structural alloy steel, this ultra-robust 32mm diameter shank tool holder body features an extended length profile (T-type, 300mm total length) designed to absorb massive torsional cutting forces during deep cantilever overhang passes. It incorporates a precision-indexed pocket geometry engineered to rigidly secure standard CCMT 1204-- indexable carbide inserts or highly polished CCGT 1204-- non-ferrous aluminum inserts.
Executing deep internal counter-boring or turning cycles in large steel blocks requires absolute stability in metal removal rates. When paired with an 80° positive rhombic insert integrating a robust multi-stage chipbreaker groove, this tooling assembly actively breaks tough structural steel swarf into compact, manageable helical segments. This advanced mechanical chip control ensures loose chips are forced outward through the large bore neck via flooded coolant pressure, entirely eliminating the risk of continuous stringy chip nesting that causes micro-cracks in carbide edges and spoils expensive workpiece dimensional limits.
Model Nomenclature Decoder: S32T-SCLCL12
Solid Alloy Steel Core
32mm Shank Dia.
300mm Total Length
Screw Clamping System
80° Rhombic Insert
95° Approach Angle
7° Insert Relief Angle
Left Hand Cutting Direction
12mm Cutting Edge (CCMT1204)
Operating Standard Clockwise Spindle Cycles or Main Turret Front Boring Overhangs?
Switch to the Mirror S32T-SCLCR12 (Right Hand) Tool Holder →2. Product Core Advantages
- Maximum Rigidity Steel Alloy Core: Hardened through heat treatment to HRC 43-45, creating unmatched deflection resistance during high-depth-of-cut (Ap) passes up to 3-4x shank diameter.
- 95-Degree Lead Angle Optimization: Engineered specifically for heavy profiling, squaring blind steps, and longitudinal internal boring without wall friction.
- Robust M4x10 Shimless Insert Pocket: Precision CNC-milled index pocket featuring an oversized high-tensile screw assembly to prevent insert movement under extreme intermittent cutting stress.
- Industrial Matte Anti-Corrosion Treatment: Coated with an advanced black oxide premium surface treatment to prevent rust and prevent thermal binding from continuous hot chip streams.
3. Technical Specification Parameters & Model Comparison
| Technical Spec Specification | Metric Value (S32T-SCLCL12) | Imperial Inch Equivalent Model |
|---|---|---|
| Shank Body Diameter | 32 mm | 1.2598 inches (Interchangeable with 1-1/4" tool blocks) |
| Overall Tool Length | 300 mm | 11.8110 inches (T-Type Long Overhang) |
| Minimum Machining Bore (D-min) | 40 mm | 1.5748 inches minimum bore entry clearance |
| Compatible Indexable Insert | CCMT 120404 / CCMT 120408 / CCGT 120404 | CCMT 431 / CCMT 432 / CCGT 431 |
Industrial Cutting Feed & Speed Data Recommendation Table
| ISO Workpiece Material Group | Cutting Speed (Vc) Range | Recommended Feed Rate (fn) |
|---|---|---|
| Carbon / Alloy Steels (P-Class / AISI 4140) | 120 - 220 m/min | 0.12 - 0.35 mm/rev |
| Austenitic Stainless Steels (M-Class / SS316) | 80 - 150 m/min | 0.10 - 0.28 mm/rev |
| Grey & Nodular Cast Irons (K-Class / G25) | 100 - 180 m/min | 0.15 - 0.40 mm/rev |
4. Product Application Scenarios
- Deep Internal Heavy Boring: Perfectly suited for structural components, hydraulic valve cylinders, and oil field piping needing large material removal rates at extended depth.
- Left-Hand Sub-Spindle Handover: Provides optimized geometric orientation during complex cycles on multi-axis turning centers utilizing back-spindle operations.
- Large Interrupted Boring Operations: The heavy-duty 32mm structural shank dampens impact vibrations when passing through cross-drilled holes or internal splines.
5. Equipment Tooling Compatibility Matrix
- 32mm & 1-1/4" Standard Turrets: Mounts directly into 32mm static tool block clamping setups or standard imperial CNC lathe boring sleeve reduction assemblies.
- Heavy CNC Slant Bed Turning Centers: Compatible with industrial manufacturing equipment ecosystems including Haas ST-30/40, Mazak Quick Turn, Doosan Lynx/Puma, DMG Mori, and Okuma.
- Universal ISO Insert Interchangeability: Milled pocket interfaces cleanly with all international brands of 80° positive rhombic size **1204** inserts (e.g., CCMT120404, CCMT120408, CCGT120404).
6. BEYOND Premium Carbide Grade Selection Guide
Maximize your S32T-SCLCL12 tool holder performance by pairing it with the ideal BEYOND indexable carbide cutting insert grade classification:
| BEYOND Cutting Insert Grade | Coating Micro-Structure Matrix | Primary Application Strengths |
|---|---|---|
| BYM11 (CVD Grade) | Thick Double-Layer Al2O3 + TiCN Thermal Shock Barrier | High-speed continuous dry roughing of hard carbon steels, tool alloys, and mold blocks. Resists high heat. |
| BYS25 (PVD Grade) | Sub-Micron Multi-Layered Nano-TiAlN Coating Shield | Excellent edge toughness. Best for interrupted heavy cuts, tough stainless steel (SS304/316), and superalloys. |
| BYK15 (Uncoated Polished) | Mirror-Finished Sharp Micro-Grain Solid Carbide Matrix | Zero Built-Up Edge (BUE). Engineered specifically for high-speed boring of aluminum blanks, brass components, and plastics. |
7. Why Choose BEYOND CNC Machine Tools?
BEYOND delivers premium-engineered, industrial-grade indexable tool holders trusted by production facilities worldwide. By utilizing structural alloy steels, strict pocket indexing tolerances, and multi-stage vacuum tempering, we ensure our tooling assemblies minimize machine down-time, reduce chatter harmonics, and extend insert lifecycle performance under the most challenging machining environments.
Global Machinist Operational Reviews
David R. — United States
"Incredible rigidity for an alloy bar. We are running this S32T on large steel tubes at a 2.5mm depth of cut with CCMT120408 inserts. Zero chatter marks. Fits our 1.25 inch block perfectly."
Jürgen M. — Germany
"Hervorragende Qualität. The left-hand geometry is exactly what we required for our sub-spindle cycle. The pocket insert seating is incredibly accurate and holds tolerances over long batch runs."
Takashi Y. — Japan
"Excellent tool holder life. We use it with polished CCGT120404 for boring giant marine bronze components. Smooth chip flow out of 50mm entry bores."
Giovanni B. — Italy
"Very heavy, solid steel construction. The screw clamping force is solid under high feed rate loads. Highly recommend for casting skin removal."
Alan K. — United Kingdom
"The 300mm length provides excellent depth reach for our hydraulic cylinder modifications. Screw locking pocket stays perfectly stable even when taking interrupted cuts."
8. AI-Style Engineering Support Engine (FAQ)
Q1: What is the absolute minimum bore entry for this 32mm shank boring bar?
A1: The minimum machining diameter (D-min) is 40mm (approx 1.57"). Attempting to bore a hole smaller than 40mm will cause the lower head flank of the steel body to rub or crash against the internal diameter wall of the workpiece.
Q2: Why is a left-hand (L) boring bar required instead of a standard right-hand (R) model?
A2: Left-hand tool holders are required when the lathe spindle operates in a clockwise direction (M04 looking toward the chuck), during specific back-boring passes on multi-axis turning centers, or when mounting tools on rear-facing flat bed cross-slides.
Q3: Does this bar utilize an internal coolant channel mechanism?
A3: The S32T-SCLCL12 model is a solid hardened alloy steel tool holder body designed for max structural cross-sectional stiffness. For high-pressure internal thru-coolant operations, please browse our E-Type solid carbide or custom internal coolant-thru steel options.
9. Technical Maintenance & Troubleshooting Guidelines
Equivalent Industry Models
Interchangeable with standard universal ISO metric S32T-SCLCL12 setups worldwide. In North American machine shops, this drops directly into static block stations designed for 1-1/4 inch round boring bar bodies utilizing metric tool conversion sleeves.
Troubleshooting Tips
Vibration / Chatter Marks: Reduce overhang ratio below 3x diameter if possible. If deep nesting happens, increase feed rate (fn) to push the chipbreaker to function or use a smaller nose radius insert (04 instead of 08).
Pocket Seat Deformation: Clean the pocket seat with compressed air at every insert index to prevent trapped micro-chips from misaligning the insert.
Workpiece Material Matrix
Universally compatible with standard industrial metal alloy groups: P (Carbon, Structural & Pre-hardened Steel), M (Austenitic & Martensitic Stainless), K (Grey, Nodular & Ductile Cast Iron Alloys), N (Aluminum, Brass & Non-ferrous alloys), and S (Inconel, Titanium & Superalloys).
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.