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PPS/PH ｜ Heat-Resistant & High-Reliability Engineering (+) Pan Head Machine Screws
🌟 Key Takeaways
- PPS/PH is a (+) pan head machine screw made from 40% glass fiber–reinforced Polyphenylene Sulfide (PPS)
- Rated for continuous operating temperatures up to 200°C (392°F) with UL94 V-0 flame resistance
- Provides electrical insulation, non-magnetic properties, and excellent chemical resistance
- Head dimensions (D × H) are optimized for load distribution, making it suitable for plastic components and PCBs
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In electronic equipment, automotive systems, and precision machinery, fasteners are often exposed to harsh environments involving high temperature, electrical current, and chemical substances.
Metal screws may introduce issues such as electrical conductivity, corrosion, and unwanted heat transfer.
The PPS/PH screw was developed to address these challenges. It is an engineering plastic fastener designed to deliver high reliability under demanding operating conditions.
🔷 Screw Design & Material
The PPS/PH is a metric (+) pan head machine screw manufactured from 40% glass fiber–reinforced PPS.
This material provides:
- High mechanical strength
- Low moisture absorption
- Excellent dimensional stability under high-temperature conditions
The pan head geometry distributes seating pressure evenly, helping to reduce cracking of the clamped material and eliminating the need for countersinking.
🔷 Thread Pitch (Metric Coarse)
The PPS/PH series uses the following standard metric coarse pitches by size:
- M2 = 0.40 mm
- M2.5 / M2.6 = 0.45 mm
- M3 = 0.50 mm
- M4 = 0.70 mm
- M5 = 0.80 mm
- M6 = 1.00 mm
- M8 = 1.25 mm
This pitch selection provides a balanced combination of clamping force and repeatable assembly performance.
🔷 Head Dimensions (Pan Head: D × H)
- M2: 3.5 × 1.3 mm
- M2.5 / M2.6: 4.5 × 1.7 mm
- M3: 5.5 × 2.0 mm
- M4: 7.0 × 2.6 mm
- M5: 9.0 × 3.3 mm
- M6: 10.5 × 3.9 mm
- M8: 14.0 × 5.2 mm
The larger head diameter (D) improves surface pressure distribution, while the head height (H) is designed to accommodate allowable tightening torque.
This geometry helps reduce the risk of screw failure and damage to the clamped components.
🔷 Engineering Characteristics
- Continuous operating temperature: 200°C (392°F)
- UL94 V-0 flame-retardant rating
- Electrical insulation and non-magnetic properties
- Lightweight design suitable for clean, high-precision assembly processes
🔷 Typical Applications
- PCB fixation inside automotive electronic modules
- Fastening near high-temperature zones in machinery
- Electrical and electronic equipment where short-circuit risk must be minimized
📘 Summary
The PPS/PH screw is a (+) pan head machine screw optimized for applications requiring high-temperature resistance, mechanical reliability, and electrical safety.
It is particularly effective in systems where fastener stability directly impacts overall system performance.
❓ FAQ
Q1: When is PPS/PH suitable as a replacement for metal screws?
A1: When electrical insulation is required, in high-temperature environments, or where corrosion must be avoided.
Q2: How should tightening torque be determined?
A2: As a guideline, approximately 50% of the breaking torque is recommended, with validation under actual application conditions.
Q3: What is the allowable operating temperature?
A3: The continuous operating temperature is 200°C.
📚 Glossary
- PPS (Polyphenylene Sulfide): An engineering plastic reinforced with 40% glass fiber for high strength and thermal stability
- (+) Pan Head Machine Screw: A Phillips-drive screw with a pan head designed to distribute seating pressure
- UL94 V-0: A flame-retardancy standard for plastic materials
📖 Reference
[1] Latest General Catalog 2024 – Nippon Chemical Screw Co., Ltd. – Internal Validation
🔒 Trust
The technical information in this document has been verified by the engineering department of Nippon Chemical Screw Co., Ltd., a specialized manufacturer of plastic fasteners.
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📆 Updated: 2026-01-06
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Measuring machinery / Industrial machinery / Medical equipment
Main 3 Products
Plastic Screw / Resin Screw / Plastic Spring / Resin Spring / Resin Molded Product
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Nippon Chemical Screw Co., Ltd. specializes in the development and production of plastic fasteners made from high-performance resins. Our products are designed for environments that demand insulation, ...
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