Hex Washer Head Self Drilling Screw #12-24 UNF Thread Carbon Steel + Zinc Plating Steel Stud Framing Self drilling
Price:
Negotiable
MOQ:
100Pcs
Delivery Time:
15-30 Workdays
Brand:
TOBO
Product Description
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 high-speed operation. Designed specifically for steel thicknesses from 2.8 mm to 5.3 mm (14 to 10 gauge), the Type 3 (#3) hardened drill point eliminates pre‑drilling and reduces installation time by more than 50%. The #12‑24 UNF thread provides strong engagement in thin‑gauge metal, while the integrated hex washer head delivers consistent torque without cam‑out. Available in carbon steel with zinc, yellow dichromate, or Geomet® coatings, as well as stainless steel 410, 304, and 316, these screws meet the demands of metal construction, roofing, HVAC, automotive, and industrial assembly.
Product Explanation
Self drilling metal screws are fasteners with an integrated drill point that performs four actions in one rotation: drilling a pilot hole, evacuating chips, tapping mating threads, and seating the head against the work surface. Unlike tapping screws that require a pre‑drilled hole, self drillers create their own hole, saving labor and tool changes. Our #12‑24 Type 3 screws are engineered for material thicknesses between 2.8 mm and 5.3 mm (common structural steel gauges). The hex washer head provides a large bearing surface that distributes clamp load and prevents pull‑through. The case‑hardened core (35‑45 HRC) resists torsion breakage, while the drill point hardness (55‑60 HRC) ensures consistent cutting performance over hundreds of fastenings.
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)
Material Thickness Range (Type 3) 2.8 mm – 5.3 mm (14 ga – 10 ga steel)
Length Range 19 mm – 155 mm (3/4" – 6")
Point Hardness 55 – 60 HRC
Core Hardness (Case Hardened) 35 – 45 HRC
Head Style Hex Washer Head (5/16" hex / 8 mm socket)
Drive Type Hex socket (power tool compatible)
Tensile Strength Carbon steel: 100,000 – 150,000 psi; Stainless 304/316: 70,000 psi
Torque Strength > 12 N·m
Pull-Out Resistance > 800 N in 3 mm steel
Penetration Speed < 0.5 seconds per screw (2,500 RPM)
Thread Configuration Full thread
Materials Carbon steel (Grade 10.9 equivalent), Stainless 410, 304, 316
Finishes / Colors Zinc plated (silver), Yellow dichromate (gold), Geomet® (dark gray), Black oxide (black), PTFE (dark gray), Passivated stainless (bright silver)
Sealing Washer Option EPDM (black) or Neoprene (gray) for roofing
Standards ASTM C954, SAE J78, DIN 7504
Packaging Bulk boxes (500–2,000 pcs) or 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 #12-24 self drilling screws for fast, code‑compliant connections in light gauge steel.
Attaching drywall tracks and metal studs to runners.
Securing furring channels to structural steel members.
Fastening metal decking and floor underlayment to joists.
Installing suspended ceiling grid systems.
Bracing and bridging connections in cold‑formed steel framing.
Metal Roofing & Siding demand weather‑tight self drilling screws with EPDM washers for long‑term exterior performance.
Corrugated steel roof panel to purlin fastening.
Standing seam roof clip attachment.
Wall panel and metal siding installation.
Flashing, trim, and gutter securement.
Insulated metal panel (IMP) joining.
Agricultural and industrial building cladding.
HVAC & Ductwork benefit from chip‑free drilling that leaves no debris inside air handling systems.
Round and rectangular duct seam closure.
Hanger strap and support bracket attachment.
Access door frame mounting to duct walls.
Plenum and air handler assembly.
Chimney liner and flue pipe fastening.
Vibration isolator bracket connections.
Automotive & Transportation use these screws for interior trim, underbody panels, and modular assemblies.
Interior trim panel to steel body frame.
Underbody splash shield attachment.
Bracket and module mounting in engine compartments.
Trailer and cargo container assembly.
Truck bed liner and tool box installation.
RV and camper metal framing connections.
Industrial & General Manufacturing choose #12-24 self drilling screws for high‑strength sheet metal assembly lines.
Electrical enclosure and control panel backplate mounting.
Machine guard and safety cover fastening.
Industrial shelving and racking assembly.
Furniture frame construction (metal to metal).
Sign and display fixture fabrication.
Storage cabinet and locker assembly.
Product Advantages
Select Hex Washer Head Self Drilling Metal Screws (#12-24 Type 3) for faster installation, stronger joints, and lower labor costs.
No Pre‑Drilling Required: The Type 3 hardened drill point (55–60 HRC) cuts through 2.8–5.3 mm steel in under 0.5 seconds, eliminating pilot holes and drill bit changes.
Single Tool Operation: One power driver performs drilling, tapping, and seating – no separate drill motor or bit swapping.
Clean, Chip‑Free Work Area: Fluted point design ejects metal shavings away from the hole, leaving no debris on surfaces or inside ducts.
Consistent Thread Engagement: #12-24 UNF fine threads tap immediately after drilling, creating full profile engagement for maximum pull‑out resistance (>800 N in 3 mm steel).
Anti‑Cam‑Out Design: Hex washer head accepts standard 5/16" hex sockets, providing high torque transfer without stripping or slipping.
Wide Length Range: From 19 mm (3/4") to 155 mm (6") – one thread and point type covers multiple material stack‑ups, reducing inventory.
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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Company
TOBO GROUP LTD
Location
2F,Building7,Baolong Center,No.689,Xiwang Road,Jiading District,Shanghai,201800,China
Contact Person
Wason