PVC Cross counter sunk head screw
PVC Cross counter sunk head screw: Corrosion Resistance and Flush Finish
M Size: M2-M10
peek plastic material: Polyvinylchloride(PVC )
product type: Countersunk bolts
color: Natural/Black/Other Colors(Customizable)
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PVC Cross counter sunk head screw Overview
PVC Cross Countersunk Head Screw is an economical and highly effective non-metallic fastener made from Polyvinyl Chloride (PVC). It is distinguished by its excellent chemical and moisture resistance and its countersunk head, which allows for a clean, flush surface installation. It is a common choice where a standard bolt or countersunk stainless bolts would corrode, but high mechanical strength is not the primary requirement.
Product Parameters
Metric (M) PVC Countersunk Cross Head Screws：
| Thread Size D | Pitch P (mm) | Major Diameter (mm) | Recommended Tapping Drill Diameter (mm) |
| M3 | 0.5 | 3.00 | 2.50 |
| M4 | 0.7 | 4.00 | 3.30 |
| M5 | 0.8 | 5.00 | 4.20 |
| M6 | 1.0 | 6.00 | 5.00 |
| M8 | 1.25 | 8.00 | 6.80 |
| M10 | 1.5 | 10.00 | 8.50 |
| M12 | 1.75 | 12.00 | 10.20 |
Key Features
The essential features of the PVC Cross Countersunk Head Screw are derived from the PVC polymer:
Excellent Chemical Resistance: PVC is highly resistant to water, moisture, acids, alkalis, and salts, making it superior to standard metal fasteners (like unplated steel countersunk bolt).
Corrosion Immunity: As a non-metal, it offers absolute resistance to rust and galvanic corrosion, a critical advantage over countersunk stainless bolts in certain aggressive environments.
Electrical Insulation: It is non-conductive, providing reliable dielectric strength and preventing short circuits.
Cost-Effectiveness: PVC is a commodity plastic, making its fasteners highly economical for high-volume manufacturing.
Flush Installation: The countersunk head ensures a clean, smooth finish, crucial for safety or aerodynamic surfaces.
Key Polyvinyl Chloride (PVC) Properties
Advantages vs Disadvantages
| Category | ✅ Advantages (Pros) | ❌ Disadvantages (Cons) |
| Protection | Superior Corrosion Immunity and excellent moisture resistance. Prevents galvanic corrosion. | Low Mechanical Strength: Significantly lower tensile strength and shear strength than metal countersunk bolt options, limiting load capacity. |
| Design | Flush Surface Finish is ideal for clean, smooth aesthetics and safety. Cost-Effective for mass production. | Temperature Limit: Low maximum service temperature (approx. $60^\circ \text{C}$ / $140^\circ \text{F}$), making it unsuitable for hot environments. |
| Functionality | Reliable Electrical Insulation. Available in standard imperial (3 8 countersunk bolt) and metric (countersunk m4 bolts) sizes. | Torque Limitation: Must be installed with very low torque to prevent stripping the polymer threads or cracking the countersunk head. |
| Installation | Compatible with common phillips head bolt drivers. | Countersinking Required: Installation requires a precise countersunk hole for the head to sit flush; otherwise, the head will protrude. |
Applications
PVC Cross Countersunk Head Screws are widely used in assemblies exposed to moisture or corrosive chemicals where a smooth, non-protruding surface is required.
Plumbing and Waterworks: Used to secure covers, inspection panels, and fixtures where exposure to water and cleaning agents is guaranteed.
Chemical and Laboratory Equipment: Employed in non-critical assemblies, ventilation ducts, and lab furniture where fasteners must resist corrosive fumes and spills.
Outdoor and Marine Fixtures: Used in outdoor furniture, decking, and marine equipment where rust-free fastening and a smooth finish are necessary.
Aesthetic Assemblies: Utilized in display cases, covers, and consumer electronics where a smooth, clean appearance is desired.
Fastener Isolation: Used to secure panels where the screw must not conduct electricity or induce galvanic corrosion in a countersunk bolts and nuts assembly.
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.