Spring Pull Pin with Circle Plastic Clamping Knob, M12 x 1.5 x 28mm, D48
PYK100-4812280606
Spring loaded pull pin, Indexing plunger, Pop pin
A high-tension spring plunger delivering precise alignment and increased durability. UJEN has harnessed over 40 years of precision mold expertise to refine its CNC lathe production of indexing plungers and pins, benefiting a wide range of industries. From AV equipment and fitness machines to automotive parts and aerospace tooling, our parts excel in both durability and ease of use. Our ergonomic knobs and screws (or bolts) can feature eco-friendly compounds like oyster shell or wood fiber, helping reduce plastic consumption. We hold ISO9001 certification for consistent mass production as well as flexible customization. Whether you are focused on specialized machinery, medical devices, or multi-position fixtures, UJEN offers robust solutions made proudly 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
- M12 x 1.5
Thread Material
- Steel
Screw Length(mm/inch)
- 28 / 1.10
Plunger Diameter(mm)
- 6
Metal Finishing
- zinc plated with trivalent
External Diameter(mm)
- 45~48
External Height(mm)
- 33~36
External Material
- PA6+GF
External Shape
- Circle
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Spring Pull Pin with Circle Plastic Clamping Knob, M12 x 1.5 x 28mm, D48 | 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 Circle Plastic Clamping Knob, M12 x 1.5 x 28mm, D48, 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.