Straight flute tap for cast iron- Nanjing Arrow-Stone

Straight flute tap for cast iron

Suitable for machining official holes and through holes in gray cast iron, nodular cast iron, malleable cast iron, and materials with similar properties.

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Classification:

Straight flute tap

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Tool matrix-Fixture matrix

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Straight flute tap for cast iron - High-efficiency solution for brittle cast iron threading

Product Overview

Designed specifically for brittle materials such as gray cast iron, ductile iron, and malleable cast iron Straight Flute Tap , featuring a reinforced cutting edge and short straight flute structure to address issues such as easy chip clogging, cutting edge chipping, and insufficient thread accuracy in cast iron processing. Suitable for through-hole and shallow blind hole threading, it is widely used in machine tool manufacturing, automotive cylinder blocks, pipe fittings, hardware castings, and other fields, and is a dedicated tool for cast iron thread forming.

Core Advantages

1. Exclusive Design for Cast Iron Materials

Anti-Chipping Edge Structure : The cutting edge is specially hardened (cutting edge hardness 64-66HRC), and the cutting edge angle is optimized for the brittle characteristics of cast iron (rake angle 5°-8°, clearance angle 6°-8°), reducing the risk of chipping and improving tool stability.
Wear-Resistant Material : Selected high-quality high-speed steel (M2/M35) with vanadium content increased to 1.5%-2% to enhance wear resistance, suitable for medium and low-speed cast iron processing (speed 30-80rpm).

2. Efficient Chip Removal, Thread Protection

Straight Flute Chip Removal Design : The straight flute structure with a 0°-5° micro-helix angle quickly removes chips generated during cast iron processing, avoiding scratches on the machined thread surface and reducing secondary cleaning operations.
Optimized Chip Holding Space : The widened groove design (groove width increased by 15% compared to ordinary taps) adapts to the large amount of chips in cast iron processing and reduces the probability of clogging.

3. High-Precision Thread Forming

Reinforced Calibration Section : The 3-5 tooth complete calibration section design ensures thread dimensional accuracy (up to ISO 5H/6H grade) and reduces thread deformation caused by material brittleness.
Surface Treatment : Using steam treatment or nitriding treatment to increase surface hardness (surface hardness ≥800HV), reduce the friction coefficient, and extend service life.

4. Complete Specifications, Strong Adaptability

Standard Specifications : Covering M3-M52 metric threads, UNC/UNF American threads, supporting coarse/fine thread selection to meet different cast iron thread requirements.
Special Customization : Extended shanks, cooling holes, and other special structures can be customized according to the hardness of the cast iron (such as high-hardness ductile iron) and processing equipment (radial drilling machine, tapping machine).

Technical Parameters

Item	Parameter Range	Standard Configuration	Optional Configuration
Applicable Materials	Gray cast iron (HT200/HT300), ductile iron (QT450/QT600), malleable cast iron	General cast iron type (default)	Special type for high-hardness cast iron
Thread Accuracy	ISO 5H, 6H; ANSI 2B	ISO 6H (default)	Customizable ISO 5H high precision
Material	M2 high-speed steel (default), M35 cobalt-containing high-speed steel	M2 high-speed steel + steam treatment	M35 high-speed steel + nitriding treatment
Groove Type Angle	0°-5° straight flute (through hole), 10° micro-helix (shallow blind hole)	0° straight flute (through-hole type, default)	10° micro-helix (dedicated to shallow blind holes)
Shank Type	Straight shank	Straight shank (M3-M24)	Extended shank, shank with cooling holes

Application Scenarios

Machine Tool Manufacturing : Threaded hole processing of cast iron bed, guide rail surface (hole diameter M8-M20, accuracy requirement 6H).
Automotive Industry : Installation thread processing of engine cylinder block (gray cast iron), brake disc (ductile iron) (hole depth ≤3D).
Pipe Fittings : Connection thread processing of cast iron pipe fittings (such as DN15-DN100 water pipe interface thread).
Hardware Castings : Sealing thread forming of cast iron valves and pump bodies (surface roughness Ra≤3.2μm).

Precautions for Use

Cooling Recommendations : It is recommended to use extreme pressure emulsion (concentration 8%-10%), avoid dry cutting or using pure mineral oil to reduce overheating and wear of the cutting edge.
Speed Control For gray cast iron, a recommended speed is 50-80rpm, and for ductile iron, it is 30-50rpm to avoid vibration and chipping caused by high speed.
Feed requirements Use a rigid tapping mode, where the feed rate is strictly matched to the thread pitch to reduce axial impact force.

Frequently Asked Questions

Q1: What if the tap is prone to chipping when machining high-hardness ductile iron (hardness ≥250HB)?
→ It is recommended to use a dedicated tap made of M35 cobalt high-speed steel + nitriding treatment, reduce the speed to 30-40rpm, and increase the cutting fluid concentration to 10%.

Q2: How to avoid cast iron chips scratching the thread surface?
→ Choose a straight flute tap, retract the tool every 2-3 turns during processing, and use a high-pressure cooling system to flush away chips in time.

Q3: How should taps be selected for through-hole and blind-hole machining?
→ For through holes, choose a 0° straight flute tap first for smoother chip removal; for shallow blind holes (hole depth ≤2D), a 10° micro-spiral straight flute tap can be selected to balance chip removal and thread integrity.

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