PP Slotted countersunk head screw
PP Slotted countersunk head screw has a specific gravity of 0.9, which is the lightest among plastics; it has excellent mechanical properties, good chemical stability; excellent electrical properties, and is resistant to high-frequency electrical insulation.
M Size: M2-M10
peek plastic material: PP Polypropylene
product type: Countersunk bolts
color: Natural/Black/Other Colors(Customizable)
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PP Slotted countersunk head screw Overview
PP (Polypropylene) Slotted Countersunk Head Screw is an economical and highly versatile plastic screw primarily known for its exceptional chemical resistance and ability to provide a flush surface finish. The Countersunk Head (Flat Head) is designed to recess completely into the material, while the Slotted Drive allows for conventional installation.
I. Overview and Design
| Feature | Detail | Purpose |
| Material (PP) | Polypropylene. A semicrystalline thermoplastic known for its rigidity, toughness, and superior chemical resistance to a wide range of substances. | Provides a cost-effective fastener that is immune to rust, corrosion, and many aggressive chemicals. |
| 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, snag-free 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
PP 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°C | 0.8 mm |
| M4 | 0.7 mm | 7.5 mm | 90°C | 1.0 mm |
| M5 | 0.8 mm | 9.2 mm | 90°C | 1.2 mm |
| M6 | 1.0 mm | 11.0 mm | 90°C | 1.6 mm |
| M8 | 1.25 mm | 14.5 mm | 90°C | 2.0 mm |
| M10 | 1.5 mm | 18.0 mm | 90°C | 2.5 mm |
Key Features
PP Countersunk Screws offer a crucial aesthetic and functional benefit alongside their material advantages:
Excellent Chemical Resistance: Superior resistance to a vast range of inorganic and organic chemicals, acids, and alkalis.
Flush Finish: Creates a smooth, snag-free surface, essential in high-flow fluid lines, clean areas, or components requiring easy cleaning.
Corrosion Immunity: Will not rust or cause galvanic corrosion, lasting indefinitely in wet or chemical atmospheres.
Cost-Effective: One of the most economical fasteners for this level of chemical resistance.
Non-Conductive: Provides reliable electrical insulation.
Key Polypropylene (PP) Properties
Applications
PP Slotted Countersunk Head Screws are commonly used in applications prioritizing chemical resistance, cost, and a smooth surface:
Chemical Processing: Securing smooth, internal liners or non-structural panels in tanks and piping where liquid flow must not be disrupted by protruding heads.
Water Treatment: Fastening components in water purification systems, where chemical exposure and a clean, non-snagging surface are needed.
Laboratory Equipment: Assembling non-critical fixtures, racks, and enclosures in damp or chemical lab environments.
Food and Beverage: Used on non-contact surfaces of processing equipment where sanitation and resistance to cleaning agents are important.
Advantages
| Category | Advantage (Pro) | Disadvantage (Con) |
| Aesthetics/Function | Creates a smooth, snag-free, flush surface. Superior chemical resistance. | Requires Preparation: Installation requires a precise countersunk hole, adding a manufacturing step. |
| Performance | High rigidity and cost-effectiveness. Lightweight and non-contaminating. | Low Mechanical Strength: Cannot withstand high tensile loads; threads are easily stripped if over-torqued. |
| Design | Suitable for highly corrosive environments. | Slotted Drive Limitation: Provides low torque transmission and is prone to tool slip (cam-out). |
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.