Small Indexing Plunger with Circle Plastic Clamping Knob, rest position, M10 x 1.0 x 8mm, D25, pin7
PSK300F-2510080707
Mini spring loaded pull pin, Tiny indexing plunger, Pop pin
A minimal hold-and-lock plunger preventing accidental re-engagement. Need quick locking with a temporary open state in tight semiconductor or medical gear? Our mini plungers let you pull, rotate, and stay unlocked. Offered in M8–M16, with 4–10mm pins, the knob includes a ring plus four shapes and seven ring/disc colors. Taiwan CNC and mold manufacturing maintain tolerances and durability, plus wood fiber or oyster shell plastic for eco benefits. ISO9001 oversight lets UJEN handle large or small B2B orders in automotive-aerospace, sports, specialized machinery, and AV solutions efficiently.
Function
UJEN Mini Spring Pull Pins with Rest Position are designed specifically for rapid fastening, frequent adjustment, and convenient repositioning. Simply pull and rotate the top knob 47 degrees to maintain the pin in a fully disengaged (rest) position, allowing users the freedom to adjust components easily with both hands.
After repositioning, simply rotate the knob directly to re-engage the pin into the hole (new improved feature), eliminating the need for an additional pulling action. This innovative improvement significantly enhances operational efficiency.
Additionally, this mini pull pin enables quick hand-tightening by rotating the top knob manually, securely fastening components and effectively preventing vibration or looseness without tools. Widely used in fitness equipment, medical devices, mechanical assemblies, furniture hardware, and more, it provides a reliable solution for precise and rapid component adjustments.
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
- M10 x 1.0
Thread Material
- Steel
Screw Length(mm/inch)
- 8 / 0.31
Plunger Diameter(mm)
- 7
Metal Finishing
- zinc plated with trivalent
External Diameter(mm)
- 25~28
External Height(mm)
- 25~28
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 measures does UJEN take regarding environmental protection?
Environmental protection is an integral part of our operation. UJEN is committed to reducing the environmental impact of our production processes, strictly...
In which fields are UJEN's handle screws applicable?
Our knob screws are widely used in various fields, including mechanical manufacturing, medical equipment, sports equipment, monitor stands, fitness equipment,...
How does UJEN handle customer feedback and after-sales issues?
Customer satisfaction is our top priority. We have a dedicated customer service team responsible for addressing customer feedback and after-sales issues,...
What makes UJEN's research and development in plastic head screws distinctive?
Our plastic head screw nuts R&D team consists of industry-experienced engineers and designers, possessing forward-thinking design concepts and deep technical...
What is UJEN's global market strategy?
As a company with an international outlook, UJEN actively expands into the global market, establishing stable cooperative relationships with clients in countries...
Small Indexing Plunger with Circle Plastic Clamping Knob, rest position, M10 x 1.0 x 8mm, D25, pin7 | Custom Hand Screws, Knobs & Handles Manufacturer | UJEN
UJEN's tool-free fastening solutions and custom adjustable handles are specifically designed for fitness equipment requiring frequent user adjustments. Our 45-year expertise in hand screw manufacturing ensures reliable, comfortable, and aesthetically pleasing products that enhance your equipment's market appeal. Contact us for customized solutions that streamline your production process.
UJEN's core strength lies in transforming customer concepts into market-ready products through innovative design-to-production services, technical consulting, and engineering solutions. Our tool-free fastening innovations and customization capabilities enable manufacturers to differentiate their products while reducing assembly time and improving end-user experience. Partner with UJEN to elevate your product competitiveness with premium hand screws and custom knob solutions backed by four decades of manufacturing excellence and commitment to quality craftsmanship.







