HL High-Low Thread Rolling Die for Plastic Screws – M2 HSS

Precision HL (High-Low) thread rolling die designed for self-tapping screws used in plastic, nylon, and low-density materials. Manufactured from M2 High-Speed Steel with CNC-ground alternating high/low thread profiles. Delivers low driving torque, high pull-out strength, and minimal radial stress on workpieces.

Key Specifications

Product Name: HL High-Low Thread Rolling Die / Screw Plate Thread Type: HL (High-Low / Hi-Lo) Double-Thread Available Sizes: M2.5 / M3 / M3.5 / M4 / M4.2 / M5 / M6 Material :M2,SKH-9,DC53 Hardness: 62–64 HRC Thread Angle :High thread 30° / Low thread 60° Surface Option: Precision ground, optional TiN / TiCN coating Application: Plastic housing, nylon parts, electrical enclosures, automotive interiors Machine Type:Flat die thread rolling machines MOQ :1 set Lead Time :15–25 working days Packing :Anti-rust paper + export carton

Product Description

HL (High-Low) thread is a dual-thread profile where high threads and low threads alternate along the screw shank at the same pitch. This unique geometry is purpose-built for fastening into plastic, nylon, and other soft or brittle materials. Our HL thread rolling dies are CNC-ground to form both the high and low thread paths in a single pass. The high thread engages the material first, creating the primary holding power, while the low thread reduces radial stress and driving torque. The result: screws that go in smoothly, hold firmly, and won't crack the host material. Made from M2 HSS with optimized heat treatment, these dies maintain sharp thread definition and dimensional stability through long production runs.

Key Features

- ✅ Alternating High-Low Profile – Low driving torque, high pull-out strength - ✅ Minimized Radial Stress – Prevents cracking in plastic and nylon parts - ✅ M2 HSS Construction – Long service life under continuous cold forming - ✅ Re-usable Fastener – Screws can be removed and re-installed multiple times - ✅ Precision CNC Ground – Consistent pitch and flank angle, low scrap rate - ✅ Custom Sizes Available – Any diameter, pitch, or length per your drawing

Applications

- Plastic housing screws (electronics, appliances, power tools) - Nylon and ABS fasteners - Automotive interior trim and dashboard screws - Electrical enclosures and junction boxes - Any application requiring vibration-resistant plastic fastening

Why Choose Us

- Specialized in HL Die Manufacturing – Deep experience with high-low thread tooling - Strict Tolerance Control – Every die inspected for profile accuracy and hardness - Factory Direct – Competitive pricing, no middleman - Fast Response – Quotation within 24 hours, standard delivery 15–25 days - OEM/ODM Supported – Custom geometry, coating, and plate size

Ordering Guide

Please provide the following for an accurate quote: 1. Thread size (e.g., M4 HL) 2. Screw length 3. Blank / wire diameter 4. High thread OD & low thread OD 5. Screw material (carbon steel / stainless steel) 6. Machine brand & model 7. Order quantity 📩 Send your drawing or sample → Quote within 24 hours.

FAQ

Q: What is the difference between HL and AB thread? A: AB thread is a dual-lead design for sheet metal. HL is a high-low alternating profile for plastic and soft materials. They serve completely different applications and are not interchangeable. Q: Can HL screws be used in metal? A: HL is optimized for plastic and nylon. For metal applications, AB or B-type tapping screws are recommended. Q: Do you provide custom HL profiles? A: Yes. Send us your drawing or screw sample, and we will manufacture the die to match your exact geometry.