PVDF Slotted counter sunk head screw
PVDF Slotted counter sunk head screw is a polymer engineering plastic with excellent chemical and weather resistance, and excellent UV resistance and aging resistance.
M Size: M2-M10
peek plastic material: Polyvinylidene fluoride(PVDF)
product Type: Countersunk bolts
Finish: Natural/Black/Other Colors(Customizable)
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PVDF Slotted counter sunk head screw Overview
PVDF (Polyvinylidene Fluoride) Slotted Countersunk Head Screw is a premium, high-performance fluoropolymer screw known for its exceptional purity, superior chemical resistance (especially to halogens and strong oxidizers), and excellent UV resistance. The Countersunk 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 (PVDF) | Polyvinylidene Fluoride. A high-performance fluoropolymer with high stiffness, abrasion resistance, and excellent resistance to UV and aggressive chemicals. | Ensures chemical inertness, UV stability, and minimal contamination in highly critical systems. |
| 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 easy installation and removal using a flat-blade screwdriver; suitable for low-torque applications. |
Product Parameters
PVDF 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) |
| M3 | 0.5 mm | 5.6 mm | $90^\circ$ | 0.8 mm |
| 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
PVDF Countersunk Screws are defined by their combination of purity, stiffness, and flush design:
Exceptional Chemical Resistance: Highly inert and resistant to halogens (chlorine, bromine), strong acids, and oxidizers, making it ideal for aggressive media.
Superior UV and Weather Resistance: Excellent durability for outdoor applications, maintaining properties under direct sunlight.
High Purity and Non-Contamination: Does not leach contaminants, critical for semiconductor and ultrapure water (UPW) systems.
Flush Finish: The countersunk head ensures a smooth, snag-free surface, reducing friction and potential for particle accumulation.
Good Mechanical Strength: High stiffness and abrasion resistance for long service life.
Key Polyvinylidene fluoride (PVDF) Properties
Advantages and Disadvantages and Usage Scenarios
| Category | Advantage (Pro) | Disadvantage (Con) | Usage Scenarios |
| Performance | Best-in-class UV, chemical, and purity profile. Excellent dimensional stability and creep resistance. | High Cost: Significantly more expensive than Nylon or PVC due to fluoropolymer status. | Semiconductor Wet Benches: Securing tank linings and panels in ultrapure water (UPW) and acid bath systems. |
| Design | Creates a smooth, snag-free, flush surface, ideal for flow management and clean environments. | Slotted Drive Limitation: Provides low torque transmission; easily stripped if over-torqued. | Chemical Flow Lines: Fastening inspection windows or covers on pipes handling aggressive, high-purity chemicals. |
| Environmental | Long-term outdoor durability and resistance to harsh weather. Non-corrosive and non-conductive. | Lower Thermal Limit: Max service temperature ($\approx 150^\circ \text{C}$) is lower than PEEK ($\approx 260^\circ \text{C}$). | Pharmaceutical/Food Processing: Fastening components where sanitizers and steam cleaning require a smooth, chemically inert surface. |
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.