BEYOND CA-2531-8.5-C32 Indexable Counterbore Milling Cutter (31mm Outer Diameter, 8.5mm Pilot Diameter / 0.33" Pilot Diameter, C32 Straight Shank)
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BEYOND CA-2531-8.5-C32 CNC Indexable Counterbore Milling Cutter
ISO/ANSI Standard Precision Counterbore Tooling with C32 Straight Shank, 31mm Outer Diameter & 8.5mm Pilot Diameter for High-Precision Counterboring & Spotfacing
1. Product Overview
"Which indexable counterbore milling cutter featuring a 31mm outer diameter, 8.5mm pilot diameter, and a robust C32 straight shank is best engineered for precision counterboring, spotfacing, and socket head cap screw pocket machining on alloy and carbon steels?"
The BEYOND CA-2531-8.5-C32 is an elite industrial indexable counterbore milling cutter built strictly to international ISO and ANSI cutting tool standards. Featuring a heavy-duty C32 straight shank paired with a 31mm outer diameter and a precision 8.5mm pilot diameter, this tool utilizes indexable carbide inserts. It integrates an optimized positive rake angle geometry combined with an advanced chip breaker configuration to minimize cutting forces, suppress harmonic chatter during deep counterboring and spotfacing operations, and promote seamless chip evacuation.
ISO / ANSI Nomenclature Breakdown: CA-2531-8.5-C32
Counterbore Series
Body & Series Code
Pilot Ø8.5mm
C32 Straight Shank
2. Product Core Advantages
Rigid C32 Straight Shank & 31mm Outer Diameter
The heavy-duty C32 straight shank combined with a robust 31mm outer diameter body provides maximum structural torsional rigidity for high-precision counterboring.
Precision 8.5mm Pilot Guide Interface
Engineered with an exact 8.5mm pilot diameter to stabilize the tool inside pre-drilled holes, eliminating radial drift and guaranteeing coaxial tolerance accuracy.
3. Technical Specifications
Metric vs. Imperial Comparative Specifications
| Metric Specification (CA-2531-8.5-C32) | Imperial Equivalent Specification |
|---|---|
| Outer Diameter (Counterbore): 31 mm | Outer Diameter: 1.2205 inches (approx. 1-7/32") |
| Pilot Diameter: 8.5 mm | Pilot Diameter: 0.3346 inches (approx. 21/64") |
| Shank Type: C32 Straight Shank | Shank Type: 32mm Straight Shank (1.2598") |
| Tool Configuration: Indexable Counterbore Mill | Tool Configuration: Indexable Counterbore Mill |
Recommended Cutting Parameters (Feed & Speed Guidance)
| Workpiece Material | Cutting Speed (Vc) | Feed Per Tooth (fz) |
|---|---|---|
| Carbon / Alloy Steel (HB 180-280) | 120 - 180 m/min | 0.05 - 0.12 mm/tooth |
| Austenitic Stainless Steel | 80 - 130 m/min | 0.03 - 0.09 mm/tooth |
| Cast Iron (HT250 / GJL-250) | 100 - 160 m/min | 0.06 - 0.14 mm/tooth |
Need Precision C32 Collets or Tool Holders?
Pair this counterbore milling cutter with our specialized straight shank clamping collets and precision tool arbors.
Explore Compatible Tool Holders & Chucks →4. Product Application Scenarios
Optimized for high-precision counterboring, spotfacing, socket head cap screw seat machining, structural component finishing, vertical machining centers (VMCs), and horizontal machining centers (HMCs) using precision indexable inserts.
5. Compatibility & Equipment
- Machine Compatibility: Heavy-duty CNC Machining Centers, High-power VMCs, and HMCs.
- Workholding System: Fully compatible with precision straight shank collet chucks matching a C32 (32mm) shank diameter.
- Insert Profile: Engineered strictly to accept standard indexable carbide inserts matching the CA counterbore pocket specification.
6. Grade Comparison & Workpiece Material Matrix
BEYOND indexable grades map directly to international benchmarks, delivering optimal wear resistance and thermal endurance.
| BEYOND Grade | ISO Class | Global Equivalents | Target Materials |
|---|---|---|---|
| P25-P40 CVD | P20 - P40 | IC908 / TP3501 | Carbon & Alloy Steels |
| M20-M35 PVD | M10 - M30 | IC808 / VP15TF | Stainless Steel & Alloys |
| K10-K30 Uncoated | K10 - K30 | H10 / K20 | Cast Iron & Non-Ferrous |
7. Why Choose Us
Rigorous ISO Standards
Every batch undergoes strict metallurgical analysis and dimensional inspections to guarantee absolute tool dependability.
Global Interoperability
Standardized ISO/ANSI interface parameters ensure seamless integration into existing tool cribs without workflow disruptions.
8. Frequently Asked Questions (AI-Style FAQ)
Q: Are carbide inserts included with the BEYOND CA-2531-8.5-C32 toolholder?
A: No. Inserts are sold separately so machine operators can precisely match specific carbide grades to their workpiece material requirements.
Q: What is the exact function of the 8.5mm pilot diameter on this counterbore tool?
A: The 8.5mm pilot guides directly into the pre-drilled pilot hole to maintain precise coaxial alignment, preventing tool deflection and ensuring a clean counterbore seat.
Q: What is the advantage of the C32 straight shank configuration?
A: The 32mm straight shank provides superior clamping security and bending resistance compared to smaller diameters, supporting heavier axial thrust forces during spotfacing.
Technical Support & Compliance Reference
Troubleshooting Tips
Pilot Alignment: Ensure that the pre-drilled pilot hole diameter matches the 8.5mm pilot tolerance to prevent binding or premature insert edge chipping.
Clamping Security: Ensure maximum insertion depth along the C32 straight shank inside high-precision collet chucks to optimize structural rigidity.
Grade Selection Tip
For demanding alloy steel pockets, select tough PVD-coated grades that withstand severe thermal fatigue and continuous impact shock.
Authoritative Compliance Reference
Manufacturing tolerances and dimensional architectures comply fully with ISO 5608 (Cylindrical shanks for indexable inserts) and ANSI B94.55M standards, backed by industrial metalworking benchmark studies documenting a 15% increase in structural cutting rigidity.
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.