PTFE Slotted cheese head screw
PTFE Slotted cheese head screw has excellent chemical stability, corrosion resistance, heat resistance and cold resistance, flame retardant grade UL94 V-0, and can be used for a long time at -190~260℃.
M Size: M3-M12
peek plastic material: Polytetra fluoroe thylene（PTFE ）
product Type: Cylinder head bolts
Finish: Natural/Black/Other Colors(Customizable)
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PTFE Slotted cheese head screw Overview
PTFE (Polytetrafluoroethylene, or Teflon) Slotted Cheese Head Screw is a premium, high-performance fluoropolymer fastener renowned for its exceptional chemical inertness, wide temperature stability, and high purity. The Cheese Head (Cylindrical Head) design provides maximum material volume in the head for good shear resistance, while the Slotted Drive allows for conventional installation.
I. Overview and Design
| Feature | Detail | Purpose |
| Material (PTFE) | Polytetrafluoroethylene. A high-performance fluoropolymer with the lowest coefficient of friction and highest chemical inertness of all plastics. | Provides a fastener that is virtually impervious to all industrial chemicals and functions across an extremely wide temperature range. |
| Head Style (Cheese/Cylindrical Head) | A tall, cylindrical head with a large diameter. | Maximizes the head’s material volume and contact surface, offering the best shear strength and stability achievable with soft PTFE. |
| Drive Style (Slotted) | A simple single slot on the top surface. | Allows for installation using a flat-blade screwdriver; suitable for low-torque applications. |
Product Parameters
PTFE Slotted Cheese Head Screws typically follow metric standards for slotted cheese head screws, such as ISO 1207 (Slotted Cheese Head Screws) or similar industry specifications.
| Nominal Diameter (d) | Thread Pitch (P) | Head Diameter (D) | Head Height (K) | Slot Width (N) |
| 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 |
| M12 | 1.75 mm | 18.0 mm | 10.0 mm | 3.0 mm |
Key Features
PTFE fasteners are defined by their extreme chemical and thermal performance:
Universal Chemical Inertness: Unaffected by virtually all industrial chemicals, solvents, and corrosive agents, including concentrated acids and caustics.
Extreme Temperature Range: Operates reliably from approximately 200°C to 260°C.
High Purity: Does not leach contaminants, vital for pharmaceutical and ultra-pure processes.
Good Shear Stability (for PTFE): The tall, solid Cheese Head profile resists lateral forces better than flatter head styles in PTFE.
Non-Conductive: Excellent dielectric strength, offering superior electrical insulation.
Advantages and Disadvantages and Usage Scenarios
| Category | Advantage (Pro) | Disadvantage (Con) | Usage Scenarios |
| Performance | Highest chemical and temperature resistance of all plastics. Excellent non-stick and non-contaminating properties. | Low Mechanical Strength: Very soft with high cold flow (creep) under load. | Chemical Reactors/Piping: Securing internal baffles, mixers, and filters exposed to highly aggressive media and high temperatures. |
| Design | Robust Cheese Head geometry provides maximum shear resistance and stability for PTFE. | Torque Restriction: Must be installed with very low, controlled torque to prevent thread stripping and joint relaxation over time. | Cryogenic/High-Heat Equipment: Fastening structural components in systems operating at temperature extremes ( e.g., 150°Cor 250°C). |
| Environmental | Non-corrosive, non-magnetic, and UV resistant (though primarily an indoor material). | High Cost: Significantly more expensive than other fluoropolymers like PVDF. | Pharmaceutical/Food Processing: Non-contaminating assemblies where steam sterilization or aggressive sanitizers are used. |
Key Polytetrafluoroethylene (PTFE) Properties
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.