Function

Plastic knob screws are produced via a one-shot injection molding process, firmly bonding the screw shaft to the knob body. This construction eliminates concerns about loosening or having to replace the screw. Their core advantage lies in combining the convenience of manual tightening with long-term stability. Made from an impact-resistant, wear-resistant nylon-glass fiber composite via injection molding, these screws maintain a reliable locking force even under light vibration, high loads, or frequent assembly and disassembly.

By minimizing extra metal components, they reduce issues such as rust or cold welding while providing insulation and a lightweight design—ideal for electronics, sports equipment, factory automation, and even medical devices. The knob’s edges feature anti-slip texturing and an ergonomic shape, allowing users to quickly tighten or remove it by hand, sparing the need for wrenches or other tools. Adding a scratch-proof pad further protects the locking interface, preventing scratches or vibration noise.

Additionally, these screws have passed ISO9001, ROHS, REACH, and SGS certifications, indicating that every stage—from raw materials to manufacturing—meets environmental and safety standards. Overall, the primary focus of plastic knob screws is quick, efficient operation with high durability and resistance to loosening. They deliver a long-lasting, secure locking performance while aligning with various equipment needs for green production and ergonomic design.

Features

• RoHS REACH compliant with plastic knob.
• Flame-proof, heat-resistant, anti-UV properties.
• The head knob has a matte finish.
• The head knob does not hurt hands, no sharp angles or burrs.
• The knob is easy to tight with a hand. the best design of beauty and grip.
• The metal is shiny and detailed.

Dimensions

Thread Type

• Screw

Thread Size

• 5/16-18

Thread Material

• Steel

Screw Length(mm/inch)

• 42 / 1.65

Metal Finishing

• zinc plated

External Diameter(mm)

• 25~28

External Height(mm)

• 13~16

External Material

• PA6+GF

External Shape

• Pentagon

FAQ

What is UJEN's core business?

UJEN specializes in the innovative design and manufacturing of hand knob screws and related hardware accessories. With over forty years of extensive experience,...

Can you give specific examples of innovation in UJEN's clamping knob screws?

Our innovation goes beyond the design of clamping knob screws, extending to technological improvements and material applications. For instance, our hand...

What role does customization play in UJEN's business?

UJEN understands the diversity of market demands; hence, we provide comprehensive customization services ranging from material selection, sizing, to surface...

How does UJEN ensure high product quality?

Quality is the lifeline of UJEN. From the selection of raw materials to production process control, every step is strictly executed according to international...

Why do UJEN's spring plungers stand out in the market?

Our spring plungers stand out not only due to their high quality and innovative design but also because of our deep understanding of customer needs and our rapid...