Hebei Kappa Metal Products Co., Ltd. is one of the most reliable manufacturers and suppliers of dt thread gray coating sds self drilling screws with hex flange head in China. Welcome to buy bulk high quality dt thread gray coating sds self drilling screws with hex flange head made in China here from our factory. If you have any enquiry about cooperation, please feel free to email us.
Drywall screws are not priced by quantity alone. Weight per piece has a direct effect on cost, especially for large orders. A small difference in screw weight can change the total tonnage and the final price.
Send us the details, drawing on my factory-floor experience, we can analyze your specific market conditions and store requirements to help you determine the most precise and appropriate pricing.e-no guesswork on weight.
Please specify:
01
- Diameter × length
- Head type (bugle head, countersunk, etc.)
02
- Thread type (fine or coarse)
- Coating (black phosphate, gray phosphate, zinc, etc.)
03
- Target weight per piece (g/pc)
- Order quantity
04
- Packaging (dimensions of the box/outer carton, package weight, and whether the logo style or color can be customized)
How We Match Capacity, Price, and Service to Your Market
- Capacity fits your selling season. We plan production around your peak months and repeat sizes, so lead times hold when your market demand picks up-not just on the first order.
- Price fits your shelf. Integrated screw and EPDM washer production keeps unit cost at a level that supports your target wholesale price and margin, without downgrading the washer or coating.
- Service fits your market requirements. We adjust packing, labels, sizes, and washer specs to your local roofing practice and climate-so the product lands ready to sell, not needing rework.
- Proof before price. Free samples before mass production let you confirm the product matches your market plan-then we talk price on a product you know fits.
In short: we don't quote our factory's strengths in general-we align capacity, cost, and service with the market you sell into.
Specifications
|
Parameter |
Details |
|
Product Name |
Double Thread Flange Hex Head Self-Drilling Screw with Washer |
|
Material |
High-strength carbon steel |
|
Thread Type |
Double thread design – coarse thread for rapid engagement, fine thread for increased clamping force |
|
Drill Point |
Self-drilling tip (drill sizes #2, #3, #4, #5) for one-step drilling and fastening |
|
Head Style |
Hexagon flange head with serrated bearing surface + pre-assembled washer |
|
Surface Finish |
Grey Ruspert multi-layer plating |
|
Size Range |
Diameter: #8 – #14 (M4.2 – M6.3) / Length: 16mm – 150mm |
|
Standards |
Compliant with DIN 7504 / ISO 15480 / IFI 113 |
Surface Treatment & Thread Details
Surface Treatment – Grey Ruspert Plating
Salt spray resistance: Exceeds 1000 hours in neutral salt spray test (ASTM B117).
Uniform appearance: Consistent grey matte finish with no hydrogen embrittlement risk.
Weather resistance: Ideal for outdoor, coastal, and high-humidity environments.
Thread Details – Double Thread Design
Dual-pitch thread geometry: The lower section features a coarse thread for fast engagement and chip clearance; the upper section has a fine thread that provides higher clamping force and vibration resistance.
Precision rolled threads: Formed after heat treatment to ensure uniform grain flow, improving fatigue strength by up to 30%.
Optimized for thick steel: The double thread design prevents stripping and ensures consistent torque when fastening heavy-gauge materials.
Factory & Quality Control
In-house heat treatment: Continuous mesh belt furnace with real-time hardness monitoring ensures core hardness of 560–740 HV.
Automated sorting: Laser optical sorting system checks length, diameter, thread profile, and head geometry – 100% inspection.
Salt spray lab: Daily corrosion testing to validate plating performance.
Torque testing: Torsion and drive tests performed per batch to ensure drill point consistency.
Customer Pain Points Solved
|
Pain Point |
Solution |
|
Corrosion failure in outdoor use |
Ruspert coating provides superior salt spray resistance – no red rust even after years of exposure. |
|
Loosening due to vibration |
Double thread design + serrated flange + pre-assembled washer create a locking effect that withstands continuous vibration. |
|
Stripped threads in thick materials |
Dual-pitch geometry distributes stress evenly, preventing thread stripping and ensuring reliable clamping. |
|
Inconsistent torque control |
Flange head with integrated washer reduces surface friction and provides a consistent torque-tension relationship. |
Custom Packaging&Private Label Available
Choose from bulk cartons, poly bags with branded labels, or retail-ready packaging. Minimum order quantities can be adjusted to support both small contractors and large-scale procurement needs.
We offer custom box/bags printing and labeling services to help you build your own product line.
FAQ
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