Thumb-Operated Plastic Knob Screws|Insert-Molded × High Retention Strength × Multi-Industry Applications | Maximize Precision with Top-Quality Hand Screws for Industrial Use

Thumb screws are available in UJEN's unique macaroon color | High-quality hand screws for industrial machinery | UJEN

Thumb screws are available in UJEN's unique macaroon color

Thumb Plastic Hand Knob Screw (Nut)

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

Thumb Plastic Hand Knob Screws (Nuts) are manufactured using a one-shot insert molding process, tightly integrating the screw or nut with the plastic knob body. This ensures a secure, one-piece structure that resists loosening and detachment during use. Designed for tool-free operation, these knobs are perfect for applications requiring manual tightening, frequent disassembly, or moderate vibration and load.


Each knob is injection-molded with glass-filled nylon, offering outstanding impact resistance, wear resistance, insulation, and lightweight properties. The all-plastic exterior avoids rust, cold welding, and conductivity issues, making it ideal for use in electronics, fitness machines, factory automation, and medical devices.

Ergonomic grip curves and anti-slip textured edges allow users to tighten or loosen by hand—no wrenches or tools required. Optional anti-scratch pads can be added to protect the mounting surface and reduce vibration noise. This product is ISO9001, ROHS, REACH, and SGS certified, aligning with international quality and environmental standards.

Key Features
  • Insert-Molded Construction: Screw or nut is permanently fused with the knob body
  • Glass-Filled Nylon: Durable, impact- and wear-resistant material
  • Ergonomic & Tool-Free Use: Anti-slip grip for fast hand tightening or release
  • All-Plastic Design: Rust-free, non-conductive, and lightweight
  • Optional Protective Pads: Prevent surface damage and vibration noise
  • Compliant with Global Certifications: ISO9001 / ROHS / REACH / SGS
Typical Applications
  • Fastening points on automated machinery
  • Assembly of fitness and sports equipment
  • External housing for medical or rehab devices
  • Consumer electronics and lightweight display mounts
  • Outdoor or automotive accessory locking knobs

UJEN offers various shapes and specifications, including exclusive macaron-colored knob options to match your branding or design intent. Browse the options below to select the ideal size and color combination. For bulk orders or OEM/ODM collaboration, contact our team for responsive support and custom manufacturing solutions.

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Thumb Plastic Hand Knob Screw (Nut)

  • Display:
Result 49 - 60 of 1784
I Shape Thumb Knob, M5 x 33mm, D20 - Straight knob M5x33mm Diameter20
I Shape Thumb Knob, M5 x 33mm, D20
K210-20S0533

Colorful grip knob can be mass produced. The main body is made of tough PA6+Glass Fiber. Easy...

Details Add to List
I Shape Thumb Knob, M5 x 38mm, D20 - Straight knob M5x38mm Diameter20
I Shape Thumb Knob, M5 x 38mm, D20
K210-20S0538

Colorful grip knob can be mass produced. The main body is made of tough PA6+Glass Fiber. Easy...

Details Add to List
I Shape Thumb Knob, M5 x 43mm, D20 - Straight knob M5x43mm Diameter20
I Shape Thumb Knob, M5 x 43mm, D20
K210-20S0543

Colorful grip knob can be mass produced. The main body is made of tough PA6+Glass Fiber. Easy...

Details Add to List
I Shape Thumb Knob, M5 x 48mm, D20 - Straight knob M5x48mm Diameter20
I Shape Thumb Knob, M5 x 48mm, D20
K210-20S0548

Colorful grip knob can be mass produced. The main body is made of tough PA6+Glass Fiber. Easy...

Details Add to List
I Shape Thumb Knob, M6 x 10mm, D20 - Straight knob M6x10mm Diameter20
I Shape Thumb Knob, M6 x 10mm, D20
K210-20S0610

Colorful grip knob can be mass produced. The main body is made of tough PA6+Glass Fiber. Easy...

Details Add to List
I Shape Thumb Knob, M6 x 14mm, D20 - Straight knob M6x14mm Diameter20
I Shape Thumb Knob, M6 x 14mm, D20
K210-20S0614

Colorful grip knob can be mass produced. The main body is made of tough PA6+Glass Fiber. Easy...

Details Add to List
I Shape Thumb Knob, M6 x 18mm, D20 - Straight knob M6x18mm Diameter20
I Shape Thumb Knob, M6 x 18mm, D20
K210-20S0618

Colorful grip knob can be mass produced. The metal parts and the main body adopt the hexagonal...

Details Add to List
I Shape Thumb Knob, M6 x 23mm, D20 - Straight knob M6x23mm Diameter20
I Shape Thumb Knob, M6 x 23mm, D20
K210-20S0623

Colorful grip knob can be mass produced. The metal parts and the main body adopt the hexagonal...

Details Add to List
I Shape Thumb Knob, M6 x 28mm, D20 - Straight knob M6x28mm Diameter20
I Shape Thumb Knob, M6 x 28mm, D20
K210-20S0628

Colorful grip knob can be mass produced. The metal parts and the main body adopt the hexagonal...

Details Add to List
I Shape Thumb Knob, M6 x 33mm, D20 - Straight knob M6x33mm Diameter20
I Shape Thumb Knob, M6 x 33mm, D20
K210-20S0633

Colorful grip knob can be mass produced. The metal parts and the main body adopt the hexagonal...

Details Add to List
I Shape Thumb Knob, M6 x 38mm, D20 - Straight knob M6x38mm Diameter20
I Shape Thumb Knob, M6 x 38mm, D20
K210-20S0638

Colorful grip knob can be mass produced. The metal parts and the main body adopt the hexagonal...

Details Add to List
I Shape Thumb Knob, M6 x 43mm, D20 - Straight knob M6x43mm Diameter20
I Shape Thumb Knob, M6 x 43mm, D20
K210-20S0643

Colorful grip knob can be mass produced. The metal parts and the main body adopt the hexagonal...

Details Add to List
Result 49 - 60 of 1784

Thumb Plastic Hand Knob Screw (Nut) | Enhance Your Equipment with Durable Knob Screws for Easy Adjustment"

Based in Taiwan since 1994, UJEN DEVELOPMENT CO., LTD. expertise in manufacturing high-quality Thumb Plastic Hand Knob Screw (Nut), 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.