NINGBO YONGBIAO FASTENER CO.,LTD
NINGBO YONGBIAO FASTENER CO.,LTD
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1.Products Details:
PWA cross - recessed pan - head self - tapping screws with washer and teeth are a type of fastener. The "P" in PWA represents the pan - head, "W" represents the washer, and "A" indicates the self - tapping thread. These screws are usually made of carbon steel or stainless steel, and can have surface treatments such as nickel - plating or galvanization. They are designed to be directly screwed into materials like metal, wood, or plastic without pre - drilling holes, forming internal threads by self - tapping, and achieving a firm fixing effect.
2.Key Features:
- Easy to Install:
With a cross - recessed design on the head, they can be easily driven by a cross - head screwdriver or an electric screwdriver, featuring flexible angle adjustment and high installation efficiency.
- Washer Design:
The built - in washer increases the contact area with the fastened material, which can evenly distribute pressure, prevent the screw head from sinking into the material surface, and enhance the fixing stability.
- Self - Tapping Function:
The thread is sharp and has a self - tapping feature. It can penetrate the material and form threads by itself, simplifying the installation process and being suitable for various non - threaded hole materials.
- Tooth Design:
The teeth on the screw can enhance the gripping force, making the screw more firmly fixed in the material, reducing the possibility of loosening, and improving the mechanical connection strength.
- Good Versatility:
They can be used in a variety of scenarios, such as furniture manufacturing, construction, and electronic equipment assembly, and are suitable for fixing different materials.
- Corrosion Resistance:
When made of stainless steel or through surface treatments like nickel - plating and galvanization, they have good corrosion resistance, which can be used in different environmental conditions and has a long service life.
3.Technical Parameters
| d | ST2.9 | ST3.5 | ST4.2 | ST4.8 | (ST5.5) | ST6.3 | |||
| P | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 | |||
| a | MAX | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 | ||
| dk | MAX | 7.5 | 9 | 10 | 11.5 | 13 | 14.5 | ||
| MIN | 6.92 | 8.42 | 9.42 | 10.8 | 12.3 | 13.8 | |||
| k | MAX | 2.35 | 2.6 | 3.05 | 3.55 | 3.8 | 4.55 | ||
| MIN | 2.1 | 2.35 | 2.75 | 3.25 | 3.5 | 4.25 | |||
| c | MAX | 0.8 | 0.9 | 1.1 | 1.35 | 1.6 | 1.8 | ||
| MIN | 0.6 | 0.7 | 0.9 | 1.05 | 1.2 | 1.4 | |||
| r | MIN | 0.1 | 0.1 | 0.2 | 0.2 | 0.25 | 0.25 | ||
| R | ≈ | 3.8 | 4.6 | 5.8 | 6.6 | 7.8 | 8.2 | ||
| Slot Number | 1 | 2 | 2 | 2 | 3 | 3 | |||
| M1 | Grade H | 3 | 4.2 | 4.6 | 5 | 6.5 | 7.1 | ||
| Depth | Grade H | MIN | 1.35 | 1.4 | 1.8 | 2.26 | 2.49 | 3 | |
| MAX | 1.8 | 2.03 | 2.46 | 2.87 | 3.15 | 3.66 | |||
| M2 | Grade Z | 2.9 | 3.9 | 4.3 | 4.7 | 6.2 | 6.7 | ||
| Depth | Grade Z | MIN | 1.58 | 1.47 | 1.88 | 2.28 | 2.51 | 3.02 | |
| MAX | 1.83 | 1.93 | 2.34 | 2.74 | 2.97 | 3.48 | |||
| y | reference value | C型 | 2.6 | 3.2 | 3.7 | 4.3 | 5 | 6 | |
| F型 | 2.1 | 2.5 | 2.8 | 3.2 | 3.6 | 3.6 | |||
| R型 | / | 2.7 | 3.2 | 3.6 | 4.3 | 5 | |||
4.Certificate Display
5.Production Process
6.Packaging and shipping Details