UJEN DEVELOPMENT CO., LTD. - UJEN is a manufacturer with 45 years of experience in producing hand screws, offering custom services and professional mold-making capabilities for knobs & handles.

Spring Pull Pin with Star Plastic Clamping Knob, M12 x 28mm, D56 | Achieve Ergonomic Efficiency with Adjustable Handles for Machinery

A consistent spring plunger solution tailored to meet demanding B2B fastening needs. Combining a 40-year mold pedigree with CNC lathe production, UJEN proudly serves B2B customers across a broad spectrum—from fitness and sports equipment to high-end automotive and semiconductor fields. Our indexing plungers and pins boast tight tolerances for multi-position locking, enhanced by knobs that can include wood-fiber or oyster shell to reduce plastic. We also incorporate ergonomic principles into screws (or bolts) for user-friendly operation. Having achieved ISO9001 certification, our Taiwan-based facility supports both mass production and specialized customization. Be it for aerospace tooling, medical devices, or AV hardware, UJEN delivers strong, flexible solutions that amplify efficiency and sustainability. UJEN is an ISO 9001 certification Spring Pull Pin with Star Plastic Clamping Knob, M12 x 28mm, D56, Spring loaded pull pin, Indexing plunger, Pop pin manufacturer from Taiwan since 1994. UJEN Development Co., Ltd., with over 45 years of expertise, specializes in manufacturing precision hand screws, knob screws, plastic knobs, adjustable handles, and indexing plungers. As an ISO 9001:2015 certified company, we offer custom solutions and professional mold-making capabilities to enhance product functionality and brand value. Our commitment to quality and innovation ensures we meet the specific needs of our customers in various industries. UJEN is a leading manufacturer of high-quality hand screws in the screw parts industry. With over 40 years of expertise in plastic injection mold development, we have specialized in crafting precision rotary knobs and handles. We offer technical consulting services and customized design solutions to provide full-service from design to production.

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Spring loaded pull pin, Indexing plunger, Pop pin | Enhance Your Equipment with Durable Knob Screws for Easy Adjustment"

Fixed pull pin M12x28mm Appearance | Customizable knob screws from Taiwan

Spring Pull Pin with Star Plastic Clamping Knob, M12 x 28mm, D56 - Fixed pull pin M12x28mm Appearance
  • Spring Pull Pin with Star Plastic Clamping Knob, M12 x 28mm, D56 - Fixed pull pin M12x28mm Appearance
  • Four different shapes (concave, plane, convex and dot) with shaped knobs
  • 49 color combinations for customers to choose from at top of the pull pin
  • Indexing plunger can match the unique macaroon color system developed by UJEN, or customize the color to meet your needs.

Spring Pull Pin with Star Plastic Clamping Knob, M12 x 28mm, D56

PYK180-561228N0606

Spring loaded pull pin, Indexing plunger, Pop pin

A consistent spring plunger solution tailored to meet demanding B2B fastening needs. Combining a 40-year mold pedigree with CNC lathe production, UJEN proudly serves B2B customers across a broad spectrum—from fitness and sports equipment to high-end automotive and semiconductor fields. Our indexing plungers and pins boast tight tolerances for multi-position locking, enhanced by knobs that can include wood-fiber or oyster shell to reduce plastic. We also incorporate ergonomic principles into screws (or bolts) for user-friendly operation. Having achieved ISO9001 certification, our Taiwan-based facility supports both mass production and specialized customization. Be it for aerospace tooling, medical devices, or AV hardware, UJEN delivers strong, flexible solutions that amplify efficiency and sustainability.

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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
Dimensional drawing of Spring Pull Pin with Clamping Knob
Thread Size
  • M12
Thread Material
  • Steel
Screw Length(mm/inch)
  • 28 / 1.10
Plunger Diameter(mm)
  • 6
Metal Finishing
  • zinc plated with trivalent
External Diameter(mm)
  • 53~56
External Height(mm)
  • 41~44
External Material
  • PA6+GF
External Shape
  • Star
Gallery
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FAQ
Does UJEN offer thumb screw samples for evaluation?

Yes, we are more than happy to provide knob screw samples for clients to evaluate and test. We believe that actual product experience can help clients...

How can UJEN ensure its handle screw nuts meet our environmental requirements?

We understand the importance of environmental protection for our clients and society. All UJEN's handle screw nuts strictly adhere to international environmental...

If our requirements change, can UJEN flexibly adjust the order?

We understand that market demands can change, so our production and logistics systems are designed with enough flexibility to accommodate changes in customer...

How does UJEN ensure the continuous innovation and development of new knob screws?

We have a dedicated R&D team responsible for the innovation and development of new knob screws. By continuously exploring the latest technological trends,...

What long-term value does partnering with UJEN offer?

Partnering with UJEN means not only obtaining high-quality spring plungers and other hardware accessories but also represents a long-term partnership....

Are UJEN's hand knob screws and indexing plungers manufactured in Taiwan?

All our handle screws and spring plungers are manufactured in Taiwan. UJEN is committed to local production, which not only supports Taiwan's economic...


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Spring Pull Pin with Star Plastic Clamping Knob, M12 x 28mm, D56 | 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, M12 x 28mm, D56, 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.