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PPS/LH ｜ PPS Hexalobular Socket Low Head Screw for High Torque in Space-Constrained Applications
🌟 Key Takeaways
- PPS/LH is a low head hexalobular (Torx) socket screw manufactured from Polyphenylene Sulfide (PPS)
- Supports continuous operating temperatures up to 200°C (392°F) and complies with UL94 V-0
- Hexalobular drive transmits higher torque and reduces cam-out
- Low head design is ideal for space-limited applications requiring consistent and precise tightening
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In electronics, automotive systems, and high-density industrial modules, fastening points often face two constraints simultaneously: limited installation space and the need for precisely controlled torque.
Conventional Phillips or hex socket screws may experience tool slippage when higher torque is applied.
PPS/LH was therefore developed to support high torque transmission in a low head configuration without compromising fastening stability.
Although the screw head height is reduced, performance is not.
The hexalobular geometry of PPS/LH increases the contact area between the driver and the screw head, enabling efficient torque transfer and significantly reducing the risk of cam-out, even in applications requiring repeated tightening or controlled torque.
PPS/LH is a low head hexalobular socket screw designed for Torx drivers.
The screw head height is lower than that of standard socket head screws, minimizing protrusion above the surface and reducing interference with surrounding components.
The PPS material provides high mechanical strength, low moisture absorption, and excellent dimensional stability at elevated temperatures, making PPS/LH suitable for continuous operation and repeated tightening in demanding engineering environments.
🔷 Thread Pitch (Metric Coarse)
PPS/LH uses standard metric coarse threads for compatibility with common fastening systems.
- M3 = 0.50 mm
- M4 = 0.70 mm
- M5 = 0.80 mm
- M6 = 1.00 mm
🔷 Head Dimensions (Low Head : D × H)
Head dimensions are defined to balance torque capacity and compactness.
- M3: 5.5 × 2.4 mm
- M4: 7.0 × 3.1 mm
- M5: 8.5 × 3.65 mm
- M6: 10.0 × 4.4 mm
The reduced H minimizes protrusion above the surface, while D remains sufficient to support proper load distribution.
🔷 Driver Size (Hexalobular)
For accurate torque control, the specified driver sizes should be used:
- M3: Size 10
- M4: Size 20
- M5: Size 25
- M6: Size 30
Correct driver selection reduces head wear and ensures consistent tightening performance.
🔷 Engineering Advantages
- Hexalobular drive reduces cam-out and improves torque control
- Low head design for space-constrained installations
- Continuous heat resistance up to 200°C (392°F)
- Flame-retardant rating UL94 V-0
- Electrically insulating and non-magnetic
- Resistant to corrosion and chemical exposure
🔷 Typical Applications
PPS/LH is suitable for high-density electronic modules, automotive components, parts near heat sources, and applications requiring consistent torque in limited spaces, including non-metal fastener systems.
📘 Summary
PPS/LH is a low head hexalobular socket screw designed for technical applications requiring high torque, compact design, and heat resistance.
It enables reliable fastening in space-constrained designs while maintaining fastening stability and electrical safety.
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❓ FAQ
Q1: What is the difference between PPS/LH and PPS/LC?
A1: PPS/LH uses a hexalobular drive for higher torque and reduced cam-out, while PPS/LC uses a standard hex socket low head design.
Q2: How much torque can PPS/LH support?
A2: PPS/LH should be used within the torque limits specified in the technical documentation to prevent head or thread deformation.
📚 Glossary (Key Terms)
- PPS (Polyphenylene Sulfide): An engineering plastic offering high strength, heat resistance, and excellent dimensional stability
- Hexalobular (Torx): A multi-lobed screw drive geometry that improves torque transmission and reduces tool slippage
- UL94 V-0: Flame-retardancy standard for materials (detailed specifications not provided)
📖 Reference
[1] Latest General Catalog 2024- – Nippon Chemical Screw Co., Ltd. –
🔒 Trust
All information in this article is based on technical documentation and manufacturing quality control processes of Nippon Chemical Screw Co., Ltd., ensuring engineering accuracy.
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#PlasticScrew #PPS #EngineeringFastener #UL94V0 #HighTorque
📆 Updated: 2026-01-07
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Measuring machinery / Industrial machinery / Medical equipment
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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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