PFA Slotted cheese head screw
PFA Slotted cheese 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: Cylinder head bolts
Finish: Natural/Black/Other Colors(Customizable)
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PFA Slotted cheese head screw Overview
PFA (Perfluoroalkoxy Alkane) Slotted Cheese Head Screw is a highly specialized plastic screw utilized in critical fastening applications that require maximum chemical and thermal resistance. The Cheese Head design features a tall, cylindrical head with a large diameter, providing a strong bearing surface. The Slotted Drive allows for tool-based installation, though the primary advantage is the PFA material itself.
I. Overview and Design
| Feature | Detail | Purpose |
| Material | PFA (Perfluoroalkoxy Alkane) | Offers near-universal chemical inertness and the highest thermal stability among melt-processable fluoropolymers. |
| Head Style | Cheese Head (Low Cylindrical) | Similar to the Pan Head but typically taller and with a flat top edge. It offers a large, robust bearing surface for clamping and is designed to resist pull-through. |
| Drive Style | Slotted Drive | A single slot allows for installation with a flat-blade screwdriver. Suitable for applications where low, controlled torque is necessary. |
| Application | Non-structural fastening in ultra-pure water (UPW), chemical processing, and sterile pharmaceutical systems. | Chosen when extreme corrosion, contamination, and high temperatures are the primary concerns. |
Product Parameters
Here is a table illustrating the standard dimensions:
| Nominal Diameter (d) | Thread Pitch (P) | Head Diameter (D) | Head Height (K) | Slot Width (N) |
| M3 | 0.5 mm | 5.5 mm | 2.4 mm | 0.8 mm |
| M4 | 0.7 mm | 7.0 mm | 3.2 mm | 1.0 mm |
| M5 | 0.8 mm | 8.5 mm | 4.0 mm | 1.2 mm |
| M6 | 1.0 mm | 10.0 mm | 5.0 mm | 1.6 mm |
| M8 | 1.25 mm | 13.0 mm | 6.0 mm | 2.0 mm |
| M10 | 1.5 mm | 16.0 mm | 8.0 mm | 2.5 mm |
Key Features
PFA Cheese Head Screws are selected for their performance limits, often exceeding the capabilities of standard plastics and even high-grade metal alloys:
Extreme Chemical Resistance: Unaffected by virtually all industrial chemicals, solvents, and concentrated acids up to its maximum service temperature.
Thermal Stability: Maintains integrity and chemical resistance from cryogenic lows up to approximately 260°C (500°C).
Ultra-High Purity: Non-leaching and non-contaminating, essential for high-purity fluid handling and sterile environments.
Robust Clamping: The tall, flat Cheese Head offers an excellent bearing surface, enhancing the clamping area.
Non-Conductive and Non-Magnetic: Provides essential electrical isolation for sensitive equipment.
Key Perfluoro alkoxyalkane (PFA) Properties
Advantages VS Disadvantage
| Category | Advantage (Pro) | Disadvantage (Con) |
| Performance | Highest Chemical and Thermal Resistance of common polymer screws. Excellent seal surface due to the large head. | Low Mechanical Strength: The soft nature of PFA means it cannot sustain high tensile or shear loads. |
| Design | Head design maximizes clamping area and resists pull-through. Corrosion and galling immune. | Slotted drive limits installation torque and is prone to cam-out. |
| Material | Very High Cost due to specialized material and complex machining. | Prone to creep or cold flow under sustained high compression, requiring periodic inspection. |
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.