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China Factory Suppliers of Cross Galvanized Flat Head Self Tapping Screws for Custom Fastener Solutions
| Thread specifications d |
ST2.2 | ST2.9 | ST3.5 | ST4.2 | ST4.8 | ST5.5 | ST6.3 | ||
| P | Pitch | 0.8 | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 | |
| a | Max | 0.8 | 1.1 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 | |
| dk | Max | 3.7 | 5.3 | 6.64 | 7.64 | 9.14 | 10.57 | 11.57 | |
| Min | 3.4 | 5 | 6.28 | 7.28 | 8.78 | 10.14 | 11.14 | ||
| k | Max | 1.6 | 2.4 | 2.6 | 3.1 | 3.7 | 4 | 4.6 | |
| Min | 1.4 | 2.15 | 2.35 | 2.8 | 3.4 | 3.7 | 4.3 | ||
| dc | h15 | Max | 5 | 7 | 8 | 9 | 10 | 12.5 | 14 |
| Min | 4.52 | 6.42 | 7.42 | 8.42 | 9.42 | 11.8 | 13.3 | ||
| s | Min | 0.3 | 0.5 | 0.8 | 0.8 | 0.8 | 1 | 1 | |
| y | Ctype | 2 | 2.6 | 3.2 | 3.7 | 4.3 | 5 | 6 | |
| F，FTtype | 1.6 | 2.1 | 2.5 | 2.8 | 3.2 | 3.6 | 3.6 | ||
| Slot Number | 0 | 1 | 2 | 2 | 2 | 3 | 3 | ||
| M | ≈ | 1 | 3 | 3.9 | 4.4 | 4.9 | 6.4 | 6.9 | |
| Insert depth / maximum | 0.85 | 1.4 | 1.4 | 1.9 | 2.4 | 2.6 | 3.1 | ||
| Insert depth / minimum | 1.2 | 1.8 | 1.9 | 2.4 | 2.9 | 3.1 | 3.6 | ||
Cross galvanized flat head self tapping screw is a mechanical connecting component with the following functions and characteristics:
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1Good fastening performance: The cross large flat head self tapping screws are made of high-strength materials, which can effectively tighten different components together and maintain the stability of the equipment.
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2Easy to disassemble: With its special head design, it can be easily tightened or disassembled using a screwdriver, saving the step of pre punching, making it more convenient to use and time-saving.
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3Strong corrosion resistance: Cross shaped flat head self tapping screws are usually made of high-quality materials, and the surface is chemically treated to form a black galvanized oxide film, which has good rust and anti-corrosion effects and can be used for a long time in harsh environments.
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4Simple structure: Composed of the head, shaft, and threaded parts, easy to manufacture and use.
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5Widely applicable: It has a wide range of applications in mechanical equipment, building structures, furniture manufacturing, electronic products, aerospace and other fields.
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6Greater strength: The flat cross shaped head allows the cross shaped flat head self tapping screw to better engage with the base material, making the connection more stable and reliable, with greater load-bearing capacity, and better tensile and shear resistance than traditional screws.
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7Higher stability: The flat cross shaped head makes the connection more stable and reliable, reducing the possibility of loosening.
Frequently Asked Questions
Q1What materials are cross galvanized flat head self-tapping screws typically made from?
These screws are typically made from high-strength carbon steel or stainless steel and then surface-treated with galvanization to form a protective zinc-based oxide coating that resists rust and corrosion in harsh environments.
Q2What thread sizes are available for cross galvanized flat head self-tapping screws?
Available thread sizes range from ST2.2 to ST6.3, with varying pitch, head diameter (dk), and head height (k) dimensions as specified in the standard thread specification table above.
Q3Do cross galvanized flat head self-tapping screws require pre-drilled holes?
No. Self-tapping screws are specifically designed to tap their own threads directly into the base material, eliminating the need for pre-drilled or pre-punched holes and significantly reducing installation time.
Q4What industries commonly use cross galvanized flat head self-tapping screws?
These screws are widely used across mechanical equipment manufacturing, building and construction, furniture production, consumer electronics, and aerospace applications due to their versatility and reliable performance.
Q5How does galvanization improve the durability of flat head self-tapping screws?
Galvanization applies a chemical treatment to the screw surface, forming a black zinc oxide film that provides excellent rust prevention and anti-corrosion protection, enabling long-term use even in demanding or outdoor environments.
Q6Why is the flat cross-shaped head design superior to traditional screw head designs?
The flat cross-shaped head offers a larger contact surface with the base material, resulting in greater load-bearing capacity, improved tensile and shear resistance, and a more stable and reliable connection compared to conventional round or pan head screw designs.