PFA Slotted counter sunk head screw
PFA Slotted counter sunk head screw is known as the “King of Plastics”. It is corrosion-resistant and electrically insulating. It is not affected by temperature and can be used for a long time at -80~260℃.
M Size: M4-M10
peek plastic material:Polyvinylidenefluoride(PFA)
product type: Countersunk bolts
Finish: Natural/Black/Other Colors(Customizable)
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PFA Slotted counter sunk head screw Overview
PFA (Perfluoroalkoxy Alkane) Slotted Countersunk Head Screw is an extremely high-performance plastic screw utilized in applications demanding maximum chemical inertness and resistance to high temperatures. The Countersunk Head ensures a flush installation, while the Slotted Drive allows for tool-based installation and removal.
Overview and Design
| Feature | Detail | Purpose |
| Material | PFA (Perfluoroalkoxy Alkane) | Offers near-universal chemical resistance and exceptional thermal stability, making it ideal for the most aggressive environments. |
| Head Style | Countersunk Head | The tapered head allows the screw to seat flush with the surface, preventing particle traps and ensuring smooth fluid flow. |
| Drive Style | Slotted Drive | The simplest drive type, requiring a flat-blade screwdriver for low-to-moderate torque installation. |
| Application | Critical fastening in high-purity, chemically aggressive, and high-temperature systems. | Used when zero contamination and total corrosion immunity are non-negotiable. |
Key Features
PFA screws are valued for their environmental superiority, often chosen over other plastics for their performance limits:
Near-Universal Chemical Inertness: Resistant to virtually all acids, bases, and solvents up to its maximum service temperature.
Extreme Thermal Stability: Maintains integrity from cryogenic temperatures up to approximately 260°C(500°C).
Ultra-High Purity: Non-leaching and non-contaminating, crucial for ultra-pure water (UPW) and pharmaceutical systems.
Non-Stick Surface: Naturally low friction, reducing material buildup.
Non-Conductive: Provides excellent electrical insulation.
Key Perfluoro alkoxyalkane (PFA) Properties
Advantages VS Disadvantage
| Category | Advantage (Pro) | Disadvantage (Con) |
| Performance | Highest Chemical Resistance and Thermal Stability among non-structural plastics. Flush design eliminates traps. | Low Mechanical Strength: The weakest structural strength among high-performance polymers (weaker than PEEK/PVDF). |
| Design | Immune to corrosion and galling; Slotted drive allows for recessed tool installation. | Slotted drive is prone to cam-out and limits installation torque. |
| Material | Very High Cost due to specialized material and manufacturing processes. | Prone to creep or cold flow under sustained pressure, which can cause loosening. |
Applications
- Semiconductor equipment
- Chemical pumps and valves
- Medical equipment
- Food industry
- Aerospace
Packaging & Delivery
Standard packaging includes PE bag, foam cover, and one double-deck corrugated outer carton for safety during transit. Delivery time is 5-15 working days depending on the quantity.