PP Slotted knurled screw
PP Slotted knurled 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: M3-M8
peek plastic material: PP Polypropylene
product type: Pan head bolts
color: Natural/Black/Other Colors(Customizable)
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PP Slotted knurled screw Overview
PP (Polypropylene) Slotted Knurled Screw is a specialty plastic fastener designed to combine the exceptional chemical resistance of PP with an ergonomic head design for tool-free, manual operation. The knurled circumference provides an easy grip for finger-tightening and quick release, making it ideal for low-stress assemblies that require frequent, non-critical access or adjustment in chemically aggressive or wet environments.
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, non-corrosive material that resists many aggressive chemicals. |
| Head Style (Knurled) | Features vertical or diagonal ridges around the circumference. | Enables quick, comfortable finger-tightening and adjustment without the need for tools. |
| Drive Style (Slotted) | Includes a single slot on the top surface. | Provides an optional means for tool-based final securing or removal using a flat-blade screwdriver. |
Product Parameters
Below are representative dimensions for common PP Slotted Knurled Screws:
| Nominal Diameter (d) | Thread Pitch (P) | **Typical Head Diameter (D) ** | **Typical Head Height (K) ** | Common Lengths (L) |
| M4 | 0.7 mm | 10.0 mm | 7.0 mm | 8 mm to 30 mm |
| M5 | 0.8 mm | 12.0 mm | 8.0 mm | 10 mm to 40 mm |
| M6 | 1.0 mm | 14.0 mm | 9.0 mm | 12 mm to 50 mm |
| M8 | 1.25 mm | 16.0 mm | 10.0 mm | 16 mm to 60 mm |
Key Features
PP Knurled Screws are valued for their combination of broad chemical resistance and user convenience:
Tool-Free Operation: The primary benefit is quick, manual assembly and disassembly, allowing for fast access to components.
Excellent Chemical Resistance: Offers superior resistance to a vast range of inorganic and organic chemicals, acids, and alkalis.
Corrosion Immunity: Will not rust or cause galvanic corrosion, lasting indefinitely in chemical or wet atmospheres.
Cost-Effective: One of the most economical corrosion-resistant fasteners available for manual adjustment.
Non-Conductive: Provides reliable electrical insulation.
Key Polypropylene (PP) Properties
Applications
PP Slotted Knurled Screws are essential in applications requiring quick access, adjustment, and chemical resistance:
Chemical Processing and Labs: Securing access panels, lids, and adjustment points on filters, small vessels, or instrumentation in chemical environments.
Water Treatment: Fastening components in water purification, deionization, and pool systems that require frequent maintenance access.
Appliance Manufacturing: Used for non-critical covers or panels that consumers may need to remove (e.g., filter covers) in wet environments.
Marine and Outdoor: Securing internal cabin fittings or removable covers exposed to salt water and humidity.
Advantages
| Category | Advantage (Pro) | Disadvantage (Con) |
| Usability | Extremely fast and easy manual adjustment/removal. Comfortable, tool-free grip. | Low Clamping Force: Designed for low torque; unsuitable for high-load structural assemblies. |
| Material | Highly economical and excellent chemical resistance. Lightweight and non-contaminating. | Low Mechanical Strength: Threads are easily stripped if over-torqued. |
| Environmental | Non-magnetic, non-conductive, and immune to rust. | Low Temperature Limit: Maximum continuous service temperature is typically low (80°C). |
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.