PTFE Slotted counter sunk head screw
PTFE Slotted counter sunk 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-M10
peek plastic material: Polytetra fluoroe thylene（PTFE ）
product Type: Countersunk bolts
Finish: Natural/Black/Other Colors(Customizable)
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PTFE Slotted counter sunk head screw Overview
PTFE (Polytetrafluoroethylene, or Teflon) Slotted Countersunk Head Screw is a premium, high-performance fluoropolymer fastener known for its exceptional chemical inertness, wide temperature stability, and high purity. The Countersunk Head (Flat Head) is designed to sit flush with the surface, providing a clean, smooth finish, 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 (Countersunk/Flat Head) | Features a flat top surface and a tapered underside (conical). | Designed to recess into a prepared hole, allowing the head to sit flush with the surface for a smooth, clean finish. |
| 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 Countersunk Head Screws typically follow metric standards for slotted countersunk head screws, such as ISO 2009 (Slotted Countersunk Flat Head Screws).
| Nominal Diameter (d) | Thread Pitch (P) | Head Diameter (D) | Head Angle | Slot Width (N) |
| M4 | 0.7 mm | 7.5 mm | $90^\circ$ | 1.0 mm |
| M5 | 0.8 mm | 9.2 mm | $90^\circ$ | 1.2 mm |
| M6 | 1.0 mm | 11.0 mm | $90^\circ$ | 1.6 mm |
| M8 | 1.25 mm | 14.5 mm | $90^\circ$ | 2.0 mm |
| M10 | 1.5 mm | 18.0 mm | $90^\circ$ | 2.5 mm |
Key Features
PTFE Countersunk Screws offer a crucial aesthetic and functional benefit alongside their material advantages:
Universal Chemical Inertness: Unaffected by virtually all industrial chemicals, solvents, and corrosive agents.
Extreme Temperature Range: Operates reliably from approximately 200°C to 260°C.
Flush Finish: Creates a smooth, snag-free surface, essential in high-flow fluid lines, cleanrooms, or components requiring easy, non-contaminating cleaning.
High Purity: Does not leach contaminants, vital for pharmaceutical and ultra-pure processes.
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), leading to thread stripping and joint relaxation over time. | Chemical Reactors/Piping: Securing smooth liners or internal components exposed to highly aggressive media and high temperatures. |
| Design | Creates a smooth, snag-free, flush surface, ideal for flow management and easy cleaning. | Torque Restriction: Must be installed with very low, controlled torque; requires periodic re-tightening. | Cryogenic/High-Heat Equipment: Fastening components in systems operating at temperature extremes (e.g., 150°C or 250°C). |
| Environmental | Non-corrosive, non-magnetic, and UV resistant. Ideal for ultra-high purity systems. | High Cost: The most expensive common polymer fastener material. | Pharmaceutical/Semiconductor: Non-contaminating assemblies where steam sterilization and a flush surface are required. |
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.