Spring Pull Pin with Star Plastic Clamping Knob, M16 x 35mm, D55
PYK170-551635N0808
Spring loaded pull pin, Indexing plunger, Pop pin
High-grade steel and a reliable spring coil deliver long-lasting performance. Drawing on four decades of mold-making experience, UJEN specializes in CNC lathe–fabricated indexing plungers and pins for B2B applications. Our solutions improve multi-position locking in specialized machinery, automotive projects, and even medical or semiconductor equipment. If sustainability is a priority, we can add wood fiber or oyster shell to the plastic knob, curbing your carbon footprint. ISO9001–certified procedures guide production, ensuring both large runs and custom tasks receive consistent quality. By adopting ergonomic designs, we help staff in industries like sports equipment and aerospace reduce physical strain during frequent adjustments. UJEN stands for robust locking efficiency made in Taiwan.
Function
UJEN Indexing Pins (Spring Pull Pins) offer an ideal solution for rapid fastening and frequent repositioning of components. Simply pull the top knob to release the pin from the positioning hole, adjust the component to your desired location, and release—built-in spring action instantly re-engages the pin for precise positioning.
Additionally, UJEN indexing pins feature an ergonomic knob design, allowing you to easily tighten the screw manually, securely clamping the component and eliminating vibration or movement, widely used across fitness equipment, industrial machinery, medical devices, and furniture hardware industries.
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)
- 35 / 1.38
Plunger Diameter(mm)
- 8
Metal Finishing
- zinc plated with trivalent
External Diameter(mm)
- 53~56
External Height(mm)
- 45~48
External Material
- PA6+GF
External Shape
- Star
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Spring Pull Pin with Star Plastic Clamping Knob, M16 x 35mm, D55 | Achieve Ergonomic Efficiency with Adjustable Handles for Machinery
Based in Taiwan since 1994, UJEN DEVELOPMENT CO., LTD. expertise in manufacturing high-quality Spring Pull Pin with Star Plastic Clamping Knob, M16 x 35mm, D55, 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.