Coolant-Through 90° Right Angle Head (DK90-BT50-ER25-Z80)

Key Technical Features and Material Standards

• 20 bar High-Pressure Internal Coolant System (CTS): Equipped with specialized high-pressure rotary seals and dual-lip fluororubber (FKM) sealing technology capable of handling up to 20 bar (290 PSI) through-spindle coolant. High-pressure fluid is delivered through the center of the tool to prevent thermal shock and extend carbide insert life in deep cavities.
• Heavy-Wall QT500-7 Ductile Iron Casing: Cast from heavy-wall QT500-7 Ductile Cast Iron and subjected to artificial aging and cryogenic stress relief. The rigid body housing minimizes deflection under heavy radial cutting forces and internal hydraulic pressure.
• Gleason Precision Ground Bevel Gears: Internal drive utilizes Gleason ground spiral bevel gears in 20CrMnTi Alloy Steel. Carburized and quenched to HRC 58-62 and ground to ISO Grade 4 precision, ensuring gear transmission backlash ≤ 15 arcmin and noise ≤ 70 dB under full load.
• P4 Class Preloaded Spindle Bearings: Supported by preloaded angular contact ball bearings (NSK/FAG) rated for P4 precision, maintaining spindle mouth runout ≤ 0.005 mm and rotational concentricity up to 6,800 RPM.

2D/3D Technical Drawings and CAD Download Center

Technical Specifications

Model

Input Shank

Spindle Output

Gage Length (L)

Max. Speed

Gear Ratio

Passing Dia. (D)

Clamping Range

Tapping Capacity

Max. Torque

Net Weight

Coolant Pressure

Stock Status

DK90-BT50-ER25-Z80

BT50

ER25

80 mm

6,800 RPM

1:1

D120 mm

Ø1.0 – Ø16.0 mm

M6 – M14

46.0 Nm

12.500 kg

20 bar (290 PSI)

Always in Stock

Quality Assurance and Testing Standards

Before dispatch, every DK90-BT50-ER25-Z80 internal coolant angle head undergoes a 100% Quality Inspection Protocol:

• 20 bar High-Pressure Coolant Seal Test: Subjected to a continuous 20 bar (290 PSI) through-spindle liquid pressure test for 30 minutes to ensure zero coolant leakage into the internal gear and bearing chamber.
• Static and Dynamic Runout Test: Measured with a dial indicator and held to ≤ 0.005 mm at the spindle nose and ≤ 0.015 mm at 4D distance.
• 60-Minute Continuous Run-In: Tested at 6,800 RPM for 60 continuous minutes. Housing temperature rise must remain ≤ 25°C above ambient temperature.
• Anti-Backlash Calibration: Verified with angular encoders to confirm transmission backlash remains ≤ 15 arcminutes under rated load.

Target Industries and Industrial Applications

• Deep Hole Side Drilling & Tapping: High-pressure coolant flushes stringy chips out of deep blind holes, preventing tool breakage when drilling or tapping M6-M14 threads laterally.
• Stainless Steel & Titanium Structural Parts: Processing heat-resistant superalloys (316L, Inconel, Titanium Ti-6Al-4V) in aerospace and heavy machinery where internal cooling is mandatory to prevent work hardening.
• Heavy Die & Mold Pocket Milling: Machining deep cooling channels, slider tracks, and internal pockets in hardened steel dies (H13, NAK80, S45C).

CNC Machine Compatibility

Optimized for Vertical Machining Centers (VMC) and Horizontal Machining Centers (HMC) equipped with Through-Spindle Coolant (CTS) systems up to 20 bar. Compatible spindle standards include:

• Spindle Standards: BT50 / BBT50 (Face & Taper double contact) / SK50 / CAT50 / HSK100A.
• Typical Machine Brands: Compatible with Haas (CTS option), Mazak, Okuma, Doosan / DN Solutions, Makino, and Toyoda machine tools.

B2B Industrial Packing and Shipping Standards

• Anti-Rust Protection: Internal coolant passages are flushed with anti-corrosion oil, and the unit is vacuum-sealed in a heavy-duty VCI (Vapor Corrosion Inhibitor) bag accompanied by moisture desiccant packs.
• Shock Absorption: Cradled inside custom-contoured, high-density polyurethane protective foam inserts to prevent shifting or drop impact during courier transport.
• Export Outer Casing: Crated in an ISPM 15-compliant, Fumigation-Free Plywood Wooden Case equipped with quick-locking metal clasps.
• HS Code: 8466.10.10.00 or 8466.30.00.90.
• Lead Time: Standard models are shipped within 5-7 working days. Custom positioning blocks (G-distance) are completed and shipped within 15-20 working days.
• Shipment Ports: Shanghai / Ningbo / Tianjin Port, China.
• Incoterms Supported: FOB, CIF, EXW, FCA, DDU, DDP.
• Express Delivery: Shipped via international air freight or ocean LCL/FCL containers depending on weight requirements.

Technical Setup and Stop Block Alignment Guide

codeText

       ┌──────────────────────────────────────┐
       │     MACHINE TOOL SPINDLE FACE        │
       └──────────────────┬───────────────────┘
                          │ (Spindle Centerline)
                          │ 
                          ▼◄──────  G  ──────►[STOP BLOCK]
                       ┌─────┐                    │
                       │Taper│                    │ (Locking Bore)
                       └─────┘                    ▼
                          │               ┌───────────────┐
                     ┌────┴────┐          │ Positioning   │
                     │  Body   ├──────────┤ Pin (D18/D20) │
                     │  Casing │          └───────────────┘
                     └─────────┘

1. Stop Block Mounting: Securely bolt the heavy-duty stop block (retaining block) to the front face of the VMC or HMC machine spindle.
2. Verify Center Distance (G-Dimension): Confirm that the center-to-center distance between your machine spindle and positioning pin socket matches your ordered G-Distance (commonly 80mm, 110mm, or 135mm on BT50 machines).
3. Indicate Side Runout: Chuck a ground test arbor into the ER25 collet. Sweeping a dial indicator along the arbor horizontally, adjust the stop block’s locking bolts until parallelism is aligned within 0.015 mm per 100mm.
4. Confirm Coolant Union Alignment: Verify that the machine’s CTS coolant supply pressure does not exceed 20 bar (290 PSI) and run a low-speed coolant test cycle to verify zero seal leakage before cutting.

Technical FAQ