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 PlateThread Type :Type AB (Dual-Lead Self-Tapping)Thread Size: M4Threads Per Inch (TPI) :24 TPI (Fine Thread)Plate Size :90/105*25*35Material :M2 ,SKH-9,DC53Wire Diameter :2.25 mmOuter Diameter :2.74 – 2.89 mmHardness :62–64 HRCThread Standard :DIN / ISO / ANSI / CustomSurface Finish :Precision Ground, Optional NTRApplication: Sheet metal screws, plastic fasteners, electrical enclosuresMachine Type: Flat die thread rolling machinesMOQ: 1 setLead Time: 15–25 working daysPacking :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 TPIThis 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 FormingManufactured 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-tapping2. Thread size & TPI: M4 × 24 TPI3. Blank diameter: 2.25 mm4. Major diameter range: 2.74–2.89 mm5. Screw material: Carbon steel / Stainless steel / Alloy6. Machine brand & model7. Required quantity📩 Send your drawing or sample → Quote within 24 hours.

Packaging & Shipping

- Packaging: Anti-rust wrap