Small Indexing Plunger with Circle Clamping Knob, M10 x 28mm, D25, pin5
PSK300-251028N0507
Mini spring loaded pull pin, Tiny indexing plunger, Pop pin
A compact tension pin that remains consistent under intense usage cycles. In tight specialized machinery or sports gear, large plungers can hinder layout, so Our mini plunger series covers M8, M10, M12, M16 with 4–10mm pins. The knob offers a ring plus four designs, and 7 color discs/rings for visual flair. Taiwan-based CNC and mold production ensures locking accuracy and longevity, with wood fiber or oyster shell for plastic reduction. ISO9001-certified, we handle bulk or custom orders for B2B in medical, automotive-aerospace, semiconductors, and AV equipment.
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
- M10
Thread Material
- Steel
Screw Length(mm/inch)
- 28 / 1.10
Plunger Diameter(mm)
- 5
Metal Finishing
- zinc plated with trivalent
External Diameter(mm)
- 25~28
External Height(mm)
- 25~28
External Material
- PA6+GF
External Shape
- Circle
- Related ProductsFAQ
Small Indexing Plunger with Circle Clamping Knob, rest position, M10 x 28mm, D25, pin5
PSK300F-251028N0507
Suitable for intricate equipment requiring incremental adjustments or checks. For medical or automotive...
Details Add to ListSmall Indexing Plunger with Circle Clamping Knob, rest position, M10 x 1.0 x 28mm, D25, pin5
PSK300F-2510280507
A built-in lockout notch keeps the pin out of the way while components are swapped. In tight...
Details Add to ListSmall Indexing Plunger with Circle Clamping Knob, M10 x 1.0 x 28mm, D25, pin5
PSK300-2510280507
Precision CNC manufacturing keeps tolerance tight for consistent mini plunger action. For small...
Details Add to List
Small Indexing Plunger with Circle Clamping Knob, M10 x 28mm, D25, pin5 | 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 Clamping Knob, M10 x 28mm, D25, pin5, 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.