Thumb Plastic Hand Knob Screw (Nut)

Thumb-Operated Plastic Knob Screws｜Insert-Molded × High Retention Strength × Multi-Industry Applications manufacturer. For applications requiring frequent manual tightening without tools, thumb-operated plastic hand knob screws provide a simple and reliable fastening solution. By integrating the screw or nut directly into the plastic knob body through insert molding, this type of hand knob screw offers stable retention, reduced loosening risk, and consistent performance under moderate vibration and load in everyday adjustment scenarios. UJEN is a high-quality Thumb Plastic Hand Knob Screw (Nut), Hand screw, hand nut, knob screw, thumb knob, plastic knob, adjustable handle, grip knob, indexing plunger 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.

Thumb screws are available in UJEN's unique macaroon color

Thumb-Operated Plastic Knob Screws｜Insert-Molded × High Retention Strength × Multi-Industry Applications

For applications requiring frequent manual tightening without tools, thumb-operated plastic hand knob screws provide a simple and reliable fastening solution. By integrating the screw or nut directly into the plastic knob body through insert molding, this type of hand knob screw offers stable retention, reduced loosening risk, and consistent performance under moderate vibration and load in everyday adjustment scenarios.

UJEN supplies thumb plastic hand knob screws for automation equipment, fitness machines, medical devices, and lightweight industrial assemblies, supporting standard specifications and OEM/ODM customization through Taiwan-based manufacturing.

Thumb Plastic Hand Knob Screw (Nut) Overview

Thumb plastic hand knob screws are designed for tool-free fastening where components must be adjusted or removed repeatedly. The insert-molded structure tightly bonds the screw or nut with the plastic knob body, forming a one-piece assembly that improves retention strength and long-term reliability.

Insert-Molded Construction

Screw or nut permanently integrated into the knob body
Reduces risk of loosening or separation during operation
Stable performance under repeated tightening cycles

Material Properties

The knob body is injection molded using glass-filled nylon to balance strength, durability, and lightweight handling.

Impact- and wear-resistant nylon composite
Non-conductive and corrosion-resistant surface
Suitable for environments sensitive to rust or electrical contact

Ergonomic & Tool-Free Operation

Thumb-friendly grip geometry for manual tightening
Anti-slip edge design improves control during operation
No tools required for installation or adjustment

Optional Features

Protective pads to prevent surface scratching
Vibration noise reduction for sensitive assemblies

Typical Applications

Adjustment points on automated machinery
Fitness and sports equipment assemblies
External housings for medical or rehabilitation devices
Consumer electronics and lightweight display mounts
Outdoor or vehicle accessory locking mechanisms

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Thumb Plastic Hand Knob Screw (Nut)

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