Hex Washer Head Self Drilling Metal Screws High-strength material case hardening Excellent driving & torsional performance

Product Description

1. The Hex Washer Head Self Drilling Screw (HWH) is manufactured from high‑quality AISI1018‑1022 carbon steel, designed for fast and secure metal‑to‑metal fastening.
2. It features a case hardness of HV550‑800 and a core hardness of HV300‑450, ensuring excellent wear resistance while maintaining ductility.
3. The screw has a carburizing depth of 0.15mm, providing a tough outer layer to withstand driving stresses without brittleness.
4. Available in gauges #10, #12, and #14, with point types #2, #3, #4, and optional PVC or rubber washer for sealing applications.
5. Length can be customized from 13mm up to 220mm, and the finish is tailored to customer requirements.

 Product Specification

1. **Material:** AISI1018‑1022 low carbon steel.
2. **Case Hardness:** HV550‑800.
3. **Core Hardness:** HV300‑450.
4. **Carburizing Depth:** 0.15mm.
5. **Attack Rate (on 4mm plate):** 10# – 22kg/4.5s; 12# – 22kg/5.0s.
**Torsional Strength:** 10# – 80‑85 kgf·cm; 12# – 100‑110 kgf·cm.

 Key Parameters (Table)

 Product Applications

1. Fastening metal roofing and cladding panels to steel substructures.
2. Securing PVC or rubber washers for water‑tight sealing in outdoor installations.
3. Assembling light‑gauge steel frames, ducts, and HVAC components.
4. Fixing metal siding, gutters, and downspouts in construction projects.
5. General purpose self‑drilling fastening where high torsional strength and drilling efficiency are required.

 Product Advantages

1. **Self‑drilling design** eliminates the need for pre‑drilling, saving time and labor.
2. **Optimized case and core hardness** provide a perfect balance between drilling ability and impact resistance.
3. **Wide customization** in gauge, length, point type, washer material, and finish to meet diverse customer needs.
4. **Excellent torsional strength** (up to 110 kgf·cm for #12) ensures reliable fastening even in thick steel plates.
5. **Consistent attack rate** guarantees smooth and fast penetration, reducing screw breakage and driver bit wear.

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## Product Functions

1. Drills its own pilot hole through metal up to 5.3mm thickness (for #12 size) without separate drilling tools.
2. Forms a secure thread engagement with the base material, providing strong clamp load.
3. When fitted with PVC or rubber washer, creates a seal that prevents moisture ingress, ideal for exposed applications.
4. Transmits high torque from the hex washer head, allowing easy driving with standard wrenches or nut drivers.
5. Protects against loosening under vibration due to the thread design and optional washer lock effect.

FAQ

1. Are you trading company or manufacturer ?
We are manufacturer ,You can see the certification.
2. How long is your delivery time?
Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
3. Do you provide samples ? is it free or extra ?
Yes, we could offer the sample for free charge but need pay the cost of freight.
4. What is your terms of payment ?
Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.