Dongguan Guanbiao Hardware Products Co., LTD
Dongguan Guanbiao Hardware Products Co., LTD Innovation is the foundation, quality is the life, pragmatism is the purpose, and efficiency is the goal. Customer satisfaction is our ultimate goal.
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Reliable button head self-tapping screws with Type B blunt point for sheet metal & plastic. Phillips socket drive, zinc plated steel. No pre-drill needed. Ideal for enclosures, brackets & DIY. M3, M4, M5 sizes.
Achieve clean, low-profile fastening in sheet metal and plastic assemblies with our **Button Head Self-Tapping Screws featuring a Type B (Blunt) Point**. Designed for direct thread-forming into **pre-punched or pre-drilled holes in thin materials**, the blunt end with tapered starting threads ensures strong engagement without pushing material aside or deforming thin sheets. The **low-profile button head** provides a smooth, rounded finish, reducing snagging, while the **internal hex socket drive** allows for high torque application and tool accessibility in confined spaces. Zinc plating offers essential corrosion protection for indoor and general industrial use.
TECHNICAL SPECIFICATIONS | |
| Material | Carbon Steel (Grade 8.8 equivalent) |
| Drive Type | Phillips |
| Head Style | Button Head (Low-profile dome, rounded top) |
| Point Type | Type B Self-Tapping Point (Blunt end with tapered starting threads for cutting into pre-punched/drilled holes) |
| Surface Finish | Zinc Plating (Yellow Chromate standard, Clear/White optional - RoHS compliant) |
| Features | Partial thread for clamping, high tensile strength (700 MPa min) |
| Thread Type | Machine Screw Thread (Metric Coarse) - Forms mating thread in substrate |
Primary Uses & Applications:
* Sheet metal fabrication (electrical enclosures, control boxes, brackets).
* Electronics assembly (PCB mounts, server racks, component brackets).
* Joining plastic housings & components (ABS, nylon, polycarbonate).
* HVAC ducting & equipment assembly.
* Automotive interior trim & accessory mounting.
* Machinery guards & covers.
* General DIY projects involving thin metal or plastic.
Surface Treatment/Finishes:
* **Zinc Plating (Yellow Chromate):** Standard finish offering good corrosion resistance for indoor and protected environments. Yellow color aids visibility.
* **Zinc Plating (Clear/White Chromate):** Alternative for a brighter, less visible finish. Slightly lower corrosion resistance than yellow.
* **Black Oxide:** Mild corrosion resistance and dark appearance for reduced glare.
How to Use:
1. **Prepare Hole:** **A pilot hole is REQUIRED.** Drill a hole slightly smaller than the screw's **minor diameter** (core diameter - approx. 70-85% of nominal shank diameter) in the top material. Hole size is critical for Type B performance.
2. **Align:** Position materials. Insert screw through the top material hole into the base material.
3. **Drive:** Insert the **correct size hex key** (Allen wrench) or hex bit into the socket. Apply firm pressure and drive the screw. The Type B blunt point will engage the hole edges and **cut clean mating threads** into the base material.
4. **Tighten:** Continue driving until the button head seats firmly against the top material surface. **Avoid over-tightening**, which can strip the formed threads, especially in plastic.