BEYOND H1612K-STUCR09-36 Stepped High-Speed Steel Internal Boring Bar & Turning Tool Holder | CNC Lathe Tool for TCMT090204 Inserts (Insert Not Included)
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BEYOND H1612K-STUCR09-36 Stepped High-Speed Steel Internal Boring Bar & Turning Tool Holder (Does Not Include Inserts)
Industrial-Grade Stepped High-Speed Steel Internal Profile Boring & Turning Bar for CNC Lathes
⚠️ Component Setup Notice: All product illustrations and technical renderings displaying an indexable carbide insert are strictly for assembly demonstration. The matching TCMT090204 indexable carbide insert is NOT included with this tool holder.
AEO Quick Answer: The BEYOND H1612K-STUCR09-36 is a high-rigidity stepped high-speed steel (HSS) internal boring bar engineered for precision CNC internal turning, profiling, and deep-bore operations utilizing a customized stepped shank transition and 93-degree lead angle configurations. Configured to accommodate TCMT090204 indexable carbide inserts, this stepped high-speed steel tool holder delivers exceptional vibration damping, enhanced clearance through restricted bores, and strict dimensional tolerances across ISO P, M, and K workpiece classifications.
1. Product Overview
"Which stepped high-speed steel internal boring bar ensures absolute dimensional stability, increased clearance in restricted internal steps, and pristine surface finish during deep bore turning operations using TCMT090204 inserts?"
The BEYOND H1612K-STUCR09-36 stepped high-speed steel internal boring bar (frequently searched as stepped HSS internal turning tool holder, reduced neck CNC boring bar, and TCMT turning bar) is expertly engineered with a unique stepped profile to provide maximum turret clamping rigidity while offering reduced neck clearance for deep internal bores. Forged from premium high-speed steel (HSS) with specialized thermal hardening, the robust body absorbs high harmonic cutting loads. The secure screw-down clamp pocket is precision-milled for TCMT090204 indexable carbide inserts, ensuring exact 7-degree positive clearance angles and consistent chip control.
ISO Model Designation Breakdown
Need alternative STUCR stepped high-speed steel boring bar sizes or lengths?
2. Product Core Advantages
- Stepped Shank Design: Features a larger rear clamping diameter transitioning to a heavily reduced front neck diameter, combining maximum turret stability with enhanced internal bore clearance.
- High-Speed Steel Rigidity: Premium HSS material composition dampens harmonic chatter during extended overhang turning operations.
- Precision Screw-Down Clamping: Locks TCMT090204 indexable inserts securely against locating pads, preventing micro-shifting under heavy interrupted cuts.
- Optimized 93° Lead Angle: Facilitates smooth profile turning, boring, and facing with minimal radial cutting force component.
3. Technical Specifications & Cutting Parameters
| Technical Parameter | Imperial Specification | Metric Equivalent |
|---|---|---|
| Shank Material & Step Profile | High-Speed Steel | Stepped Design | HSS | Custom Metric Step Transition |
| Overall Length (L) | Approx. 4.92" (K designation) | 125.0 mm |
| Compatible Insert Size | TCMT 0902 Series | Triangular 7° Positive Insert |
| Hand Orientation & Angle | STUCR (Right-Handed, 93°) | Right Hand Internal Boring |
Recommended Cutting Parameters (TCMT090204 Inserts) - Dual-Column Reference
| Workpiece Material Group | Cutting Speed (Vc, m/min) | Feed Rate (fn, mm/rev) & Depth (ap) |
|---|---|---|
| ISO P (Carbon & Alloy Steel) | 100 - 180 m/min | fn: 0.05 - 0.18 mm/rev | ap: 0.3 - 2.0 mm |
| ISO M (Stainless Steel) | 70 - 140 m/min | fn: 0.04 - 0.15 mm/rev | ap: 0.2 - 1.5 mm |
| ISO K (Cast Iron) | 90 - 160 m/min | fn: 0.06 - 0.20 mm/rev | ap: 0.3 - 2.0 mm |
4. Product Applications
- Stepped Internal Boring: Specialized machining of deep internal diameters with highly restricted entry points or variable wall thicknesses using stepped high-speed steel shanks.
- Internal Profiling & Finishing: Achieving high dimensional accuracy and superior surface finishes in deep-bore cylindrical components.
- Precision Industrial Manufacturing: Ideal for hydraulic valve bodies, high-precision gear hubs, and complex tubular components in aerospace and automotive sectors.
5. Compatibility & Accessories
Insert Compatibility: Universal matching compliance with industry-standard TCMT090204 triangular indexable carbide inserts.
Tool Holding: Designed with a stepped shank profile to secure firmly into standard CNC lathe turret boring blocks and split reduction bushings.
Clamping Hardware: Equipped with premium precision TORX screws and clamping elements designed to lock inserts securely under high radial cutting stress.
6. Material Comparison: Stepped High-Speed Steel (HSS) vs. Standard Straight Shanks
Enhanced Clearance: The heavily reduced front neck diameter permits deeper boring access without tool rubbing, outperforming standard straight shanks in restricted bores.
Rigidity Retention: Maintains a heavy rear shank diameter to anchor firmly in the turret, preventing base deflection while easing front-end clearance.
Chatter Reduction: Superior metallurgical damping properties of HSS suppress harmonic vibrations during deep internal passes.
7. Why Choose BEYOND Tooling?
- ISO 5,608 Manufacturing Standards: Certified production lines ensuring rigorous compliance with international boring bar tolerances.
- Direct Factory Pricing: Premium high-speed steel metallurgical performance supplied directly without intermediate distributor markups.
- Expert Technical Support: Professional machinists ready to help configure internal turning parameters and insert grades.
8. Frequently Asked Questions
Q: Does the BEYOND H1612K-STUCR09-36 stepped boring bar include the TCMT090204 insert?
A: No. To allow complete grade and chipbreaker flexibility for your specific workpiece material, the TCMT insert is sold separately.
Q: What is the benefit of the stepped shank design (H1612)?
A: The stepped design features a larger rear clamping diameter for maximum rigidity in the turret and a heavily reduced front neck diameter to provide extra clearance inside restricted internal bores.
Q: What insert geometry is compatible with this holder?
A: This model is engineered specifically for TCMT 0902 series triangular 7-degree positive clearance indexable inserts.
Grade Comparison: PVD coated carbide grades provide exceptional edge toughness for stainless steel internal turning; CVD coated grades offer superior crater wear resistance in carbon and alloy steels.
Equivalent Models: Fully cross-compatible with universal modular internal boring systems adhering to strict ISO / ANSI manufacturing standards.
Troubleshooting: Excessive chatter or poor surface finish in deep bores usually indicates excessive overhang ratio or worn insert nose radius; reduce feed rate or shorten bar stickout.
Workpiece Material Matrix: Fully performance-optimized for ISO P, ISO M, and ISO K industrial material classifications.
Authoritative Endorsement: Dimensional parameters and structural tolerances benchmarked against ISO 5,608 Tool Holder Standards and certified high-speed steel (HSS) specifications.
Need Help With OYYU/BEYOND Inserts?
Looking for a OYYU/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 OYYU/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.