Hex Washer Head Self Drilling Screws #12-24 Unified Fine Thread Carbon Steel Drill Point Type 2, 3, 4 Available
Product Description:
Self Drilling Metal Screws (Hex Washer Head – #12-24 Type 3)
Product Summary
Our Hex Washer Head Self Drilling Metal Screws combine drilling, tapping, and fastening into a single operation. The #12-24 thread size and Type 3 drill point are specifically engineered for steel thicknesses from 2.8 mm to 5.3 mm (14 to 10 gauge). The hardened drill point eliminates pre-drilling, while the hex washer head provides high torque transfer without cam-out. Available in zinc plated, yellow dichromate, stainless steel, and premium anti-corrosion coatings, these screws are the standard choice for metal framing, roofing, HVAC, and industrial assembly.
Technical Specifications
| Parameter | Details |
|---|---|
| Product Name | Hex Washer Head Self Drilling Screw (HWH) |
| Thread Size | #12-24 UNF (Unified Fine) |
| Outer Diameter | 5.5 mm |
| Drill Point Type | Type 3 (#3) – for material thickness 2.8 – 5.3 mm |
| Drill Point Hardness | 55 – 60 HRC |
| Core Hardness | 35 – 45 HRC (case hardened) |
| Length Range | 19 mm (3/4") to 155 mm (6") – see table below |
| Head Style | Hex Washer Head (standard 5/16" hex) |
| Drive Type | Hex socket (power tool compatible) |
| Materials | Carbon steel (zinc/yellow/Geomet®) / Stainless steel 410 / 304 / 316 |
| Finishes / Colors | Zinc plated (silver), Yellow dichromate (gold), Black oxide (black), Geomet® (gray), PTFE (dark gray) |
| Material Thickness Range (Type 3) | 2.8 mm – 5.3 mm (14 ga – 10 ga steel) |
| Tensile Strength | 100,000 – 150,000 psi (depending on grade) |
| Torque Strength | > 12 N·m (no head stripping) |
| Pull-Out Resistance | > 800 N in 3 mm steel |
| Standards | ASTM C954, SAE J78, DIN 7504 |
| Packaging | Bulk boxes (500–2,000 pcs), strip collated for auto-feed |
Dimensional Table (Part Numbers)
| PART NO. | SIZE (INCH) | DIA. (MM) | LENGTH (MM) | POINT NO. | MATERIAL THICKNESS (MM) |
|---|---|---|---|---|---|
| HWH12L19P5 | #12-24 x 3/4" | 5.5 | 19 | #3 | 2.8-5.3 |
| HWH12L25P5 | #12-24 x 1" | 5.5 | 25 | #3 | 2.8-5.3 |
| HWH12L35P5 | #12-24 x 1-3/8" | 5.5 | 35 | #3 | 2.8-5.3 |
| HWH12L38P5 | #12-24 x 1-1/2" | 5.5 | 38 | #3 | 2.8-5.3 |
| HWH12L45P5 | #12-24 x 1-3/4" | 5.5 | 45 | #3 | 2.8-5.3 |
| HWH12L50P5 | #12-24 x 2" | 5.5 | 50 | #3 | 2.8-5.3 |
| HWH12L55P5 | #12-24 x 2-1/8" | 5.5 | 55 | #3 | 2.8-5.3 |
| HWH12L63P5 | #12-24 x 2-1/2" | 5.5 | 63 | #3 | 2.8-5.3 |
| HWH12L75P5 | #12-24 x 3" | 5.5 | 75 | #3 | 2.8-5.3 |
| HWH12L90P5 | #12-24 x 3-1/2" | 5.5 | 90 | #3 | 2.8-5.3 |
| HWH12L100P5 | #12-24 x 4" | 5.5 | 100 | #3 | 2.8-5.3 |
| HWH12L125P5 | #12-24 x 5" | 5.5 | 125 | #3 | 2.8-5.3 |
| HWH12L155P5 | #12-24 x 6" | 5.5 | 155 | #3 | 2.8-5.3 |
Product Applications
Metal Construction & Steel Framing rely on these #12-24 self drilling screws for fast, secure connections in light gauge steel.
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Attaching drywall tracks and metal studs to runners
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Securing furring channels to structural steel members
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Fastening metal decking and floor underlayment
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Installing suspended ceiling grid systems
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Bracing and bridging connections in cold-formed steel framing
Metal Roofing & Siding projects demand weather-resistant self drilling screws with sealing washers (EPDM or neoprene).
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Corrugated steel roof panel to purlin fastening
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Standing seam roof clip attachment
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Wall panel and metal siding installation
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Flashing, trim, and gutter securement
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Insulated metal panel (IMP) joining
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Agricultural and industrial building cladding
HVAC & Ductwork benefit from chip-free drilling and fast installation.
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Round and rectangular duct seam closure
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Hanger strap and support bracket attachment
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Access door frame mounting to duct walls
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Plenum and air handler assembly
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Chimney liner and flue pipe fastening
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Vibration isolator bracket connections
Automotive & Transportation use these screws for interior and underbody metal assemblies.
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Interior trim panel to steel body frame
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Underbody splash shield attachment
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Bracket and module mounting in engine compartments
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Trailer and cargo container assembly
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Truck bed liner and tool box installation
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RV and camper metal framing connections
Industrial & General Manufacturing choose #12-24 self drilling screws for high-strength sheet metal assembly.
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Electrical enclosure and control panel backplate mounting
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Machine guard and safety cover fastening
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Industrial shelving and racking assembly
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Furniture frame construction (metal to metal)
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Sign and display fixture fabrication
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Storage cabinet and locker assembly lines
Product Advantages
Select Hex Washer Head Self Drilling Metal Screws (#12-24 Type 3) for faster installation, stronger joints, and lower labor costs.
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No Pre-Drilling Required: The Type 3 hardened drill point cuts through 2.8–5.3 mm steel in under one second, eliminating pilot holes.
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Single Tool Operation: One power driver drills and drives – no bit changes, no drill motors needed.
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Clean, Chip-Free Work Area: Flutes eject chips away from the hole, leaving no metal debris on surfaces or inside ducts.
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Consistent Thread Engagement: #12-24 UNF threads tap immediately after drilling, creating full profile engagement for maximum pull-out resistance (>800 N).
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Anti-Cam-Out Design: Hex washer head accepts standard 5/16" hex sockets, providing high torque transfer without stripping.
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Wide Length Range: From 19 mm (3/4") to 155 mm (6") – one thread and point type covers multiple material stack-ups.
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Corrosion Options: Zinc plated (indoor), yellow dichromate (humidity), Geomet® (1000+ hour salt spray), and stainless 304/316
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.
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