Type AB Tapping Screw Thread Rolling Die – M4 × 24 TPI, M2 HSS

Precision Type AB thread rolling die engineered for M4 self-tapping screws with 24 TPI fine thread. Manufactured from M2 High-Speed Steel, plate size 24×30 mm. Designed for blank diameter 2.25 mm and major diameter 2.74–2.89 mm. Dual-lead AB geometry ensures fast starting and high-strength thread engagement in sheet metal and plastic applications.

Key Specifications

Product Name :Type AB Tapping Screw Thread Rolling Die / Screw Plate Thread Type :Type AB (Dual-Lead Self-Tapping) Thread Size: M4 Threads Per Inch (TPI) :24 TPI (Fine Thread) Plate Size :90/105*25*35 Material :M2 ,SKH-9,DC53 Wire Diameter :2.25 mm Outer Diameter :2.74 – 2.89 mm Hardness :62–64 HRC Thread Standard :DIN / ISO / ANSI / Custom Surface Finish :Precision Ground, Optional NTR Application: Sheet metal screws, plastic fasteners, electrical enclosures Machine Type: Flat die thread rolling machines MOQ: 1 set Lead Time: 15–25 working days Packing :Anti-rust paper + export carton / wooden case

Product Description

What Is Type AB Thread? Type AB is a dual-lead self-tapping thread profile. It features a coarser initial lead that quickly draws the screw into the pre-drilled hole, followed by a finer main thread that displaces material to create a high-strength, vibration-resistant internal thread. This design combines the fast-start advantage of Type A screws with the superior holding power of Type B screws. Engineered for M4 × 24 TPI This die is precision-ground for M4 self-tapping screws at 24 threads per inch—a fine-pitch configuration commonly used in thin-sheet metal and plastic assemblies where vibration resistance and pull-out strength are critical. The die is calibrated for a blank (wire) diameter of 2.25 mm and produces a finished major diameter range of 2.74–2.89 mm, ensuring correct pitch diameter and proper thread engagement without over-stressing the workpiece. M2 HSS – Built for Continuous Cold Forming Manufactured from M2 high-speed steel and heat-treated to 62–64 HRC, these dies deliver: - High wear resistance under repeated high-pressure rolling - Toughness to prevent chipping at thread crests - Dimensional stability over extended production runs

Key Features

- ✅ Type AB Dual-Lead Profile – Fast starting + high-strength fine thread engagement - ✅ 24 TPI Fine Pitch – Ideal for thin sheet metal and plastic applications - ✅ M2 HSS Construction – Long service life, excellent wear resistance - ✅ Tight Dimensional Control – Blank 2.25 mm → Major dia 2.74–2.89 mm - ✅ Reduced Driving Torque – Smooth thread transition minimizes work hardening - ✅ Low Scrap Rate – Consistent pitch and flank angle across production batches

Applications

- Sheet metal fasteners (HVAC, appliance, electrical panels) - Plastic housing screws (electronics, automotive interiors) - Self-tapping screws for pre-drilled holes in thin materials - Type AB screws per DIN 7971 / ISO 1479 standards

Why Choose Us

- Specialized in AB Tap Die – Deep experience in dual-lead thread rolling tooling - Precision CNC Grinding – Every die inspected for profile accuracy and pitch control - Strict Quality Control – Hardness testing, dimensional verification, surface inspection - Custom Engineering – Adjust geometry, coating, or plate size to your machine - Factory Direct Pricing – No middleman, competitive rates for OEM & repeat orders

Ordering Guide

To receive an accurate quotation, please provide: 1. Thread type: Type AB / Dual-lead self-tapping 2. Thread size & TPI: M4 × 24 TPI 3. Blank diameter: 2.25 mm 4. Major diameter range: 2.74–2.89 mm 5. Screw material: Carbon steel / Stainless steel / Alloy 6. Machine brand & model 7. Required quantity 📩 Send your drawing or sample → Quote within 24 hours.

Packaging & Shipping

- Packaging: Anti-rust wrap