Technology / product information

In industrial assembly and maintenance, where control boxes, measuring instruments, and electronic enclosures must be frequently opened and closed, engineers demand components that combine strength, light weight, and tool-free operation.

The PC-WH・BK・RE/CR-S knob screw from Nippon Chemical Screw Co., Ltd. perfectly meets these needs.
Made from polycarbonate (PC) with a stainless steel insert, it offers superior tensile strength and long-lasting performance — all in a compact and ergonomic design that allows manual fastening without tools.


■ Key Features
- High-quality Polycarbonate Knob available in three colors: White (WH), Black (BK), and Red (RE)
- Stainless Steel Insert inside the knob for enhanced strength, corrosion resistance, and longer service life
- Hand-tightenable Design – no screwdriver or wrench required, improving assembly and maintenance efficiency
- Flame Retardant (UL94 V-2 equivalent) for the white model, providing safety in high-temperature environments
- RoHS2 Compliant, free from hazardous substances and heavy metals for safer and greener production


■ Sizes & Specifications
- Thread size: M3, M4
- Pitch: 0.5 mm (M3) / 0.7 mm (M4)
- Length (L): 6–20 mm
- Available colors: White (WH), Black (BK), Red (RE)
- Minimum order quantity: 100 pcs (depending on size)

> Note:
- Stainless steel screw insert provides superior durability and rust resistance.
- Slight dimensional variations may occur but do not affect functionality.


■ Applications
- Fastening and securing control box covers or electronic equipment enclosures
- Devices requiring frequent opening and closing, such as inspection tools or calibration units
- Ideal for lightweight machinery, laboratory instruments, and test systems
- Suitable for cleanroom or maintenance environments where tool-free operation is preferred


■ Advantages of PC-WH・BK・RE/CR-S Knurled Screws
1. Lightweight yet strong: Up to 50% lighter than metal while maintaining high tensile strength.
2. Corrosion-free: Stainless insert prevents rust even in humid or outdoor conditions.
3. User-friendly: Allows fast manual assembly, reducing tool use and improving workflow safety.
4. Cost-efficient: Long service life and RoHS2 compliance reduce maintenance and regulatory costs.


■ About the Manufacturer｜Nippon Chemical Screw Co., Ltd.
Nippon Chemical Screw Co., Ltd. is a pioneering manufacturer of precision plastic screws and fasteners in Japan, with more than 60 years of industry experience.
The company offers over 3,000 plastic fastener types, supporting various industries including electronics, precision instruments, and industrial machinery.

> Company Highlights
- 100% made in Japan
- In-house integrated production: From mold design to injection molding
- Material versatility: PC, PEEK, PTFE, PPS, and more
- Global reach: Supplying to Asia, Europe, and North America

Nippon Chemical Screw ensures consistently high quality and reliability through precision manufacturing and strict quality control.


For more information, please contact us below or download the brochure for detailed specifications.


Updated: 2025-10-07


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