Small Indexing Plunger with Circle Plastic Clamping Knob, M16 x 16mm, D33, pin8
PSK300-331616N0810
Mini spring loaded pull pin, Tiny indexing plunger, Pop pin
Versatile enough to cover tasks from automotive clips to consumer gadgets. If your center post in medical or sports equipment needs a smaller, more user-friendly plunger, Our M8–M16 lineup plus 4–10mm pins meets varied locking demands. The knob includes a ring plus four styles, and 7 ring/disc colors for enhanced visuals; wood fiber or oyster shell formulas further eco efforts. Taiwan CNC and mold mass production ensure durability and tight tolerances, while ISO9001 oversight fills large or low-volume B2B orders for automotive-aerospace, semiconductors, or specialized machinery.
Function
UJEN Mini Spring Pull Pins are ideal for applications requiring compact size, frequent adjustment, and quick fastening. Simply pull the compact knob upward to release the pin from its hole, adjust the component to your desired position, and release—the internal spring immediately re-engages the pin for precise positioning.
Additionally, this pull pin features a special knob design allowing manual rotation to tighten screws directly by hand, ensuring stable clamping and preventing component vibration or loosening without needing tools. Perfectly suited for fitness equipment, medical devices, mechanical assemblies, and furniture hardware.
Features
- RoHS REACH compliant.
- Pull and release process smoother.
- Thread is class 2.
- 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.
- Zinc plated metal, stable corrosion resistance.
- The fitting tolerance between metal parts is small, reducing sway.
- The rounded corner of the Plunger's front end increases smoothness of insertion.
- The chamfered front end of the screw makes assembly smoother and reduces wear on the mating end face.
Dimensions

Thread Size
- M16
Thread Material
- Steel
Screw Length(mm/inch)
- 16 / 0.63
Plunger Diameter(mm)
- 8
Metal Finishing
- zinc plated with trivalent
External Diameter(mm)
- 33~36
External Height(mm)
- 33~36
External Material
- PA6+GF
External Shape
- Circle
Gallery
- Customized service for Bolt, Screw & Nut (metal parts)
- The center pin can be fitted with an anti-scratch pad to minimize scratches on the surface of the locked object.
- Optional accessories of knobs, handles, pull pins
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Details Add to List- 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...
Small Indexing Plunger with Circle Plastic Clamping Knob, M16 x 16mm, D33, pin8 | Achieve Ergonomic Efficiency with Adjustable Handles for Machinery
Based in Taiwan since 1994, UJEN DEVELOPMENT CO., LTD. expertise in manufacturing high-quality Small Indexing Plunger with Circle Plastic Clamping Knob, M16 x 16mm, D33, pin8, hand screws, knob screws, adjustable handles, grip knobs, and indexing plungers. Their commitment to customization and precision ensures each component, from hand screws to indexing plungers, meets rigorous standards. This dedication positions UJEN as a leader in supplying durable and reliable industrial components to global markets.
UJEN Development Co., Ltd. is a leading manufacturer of precision-engineered hand screws, knob screws, plastic knobs, adjustable handles, and indexing plungers for a variety of industrial needs. Our 45-year legacy, combined with ISO 9001:2015 certification, underscores our commitment to quality, innovation, and customer satisfaction. Specializing in custom solutions, we excel in professional moldmaking, enhancing equipment functionality across industries.
UJEN has been offering customers high-quality hand screws for industrial machinery since 1994, both with advanced technology and 47 years of experiences, UJEN ensures each customer's demands are met.







