Commonly Types of Knurled Screws and Their Applications

Knurled screws, known for their distinctive design, play a crucial role in various industries due to their enhanced grip and ease of manual tightening. This article delves into the characteristics, applications, and specific models of knurled screws, offering comprehensive insights for those seeking reliable fastening solutions.

knurled screws

Understanding the Knurled Design Advantage

Knurled screws, also known as thumbscrews, are differentiated by the presence of a knurl pattern on their head. This knurl pattern, typically consisting of raised diagonal lines or a diamond pattern, provides an essential benefit: enhanced grip. The increased surface area created by the knurled texture allows for easier manual tightening without the need for specialized tools in many cases. This makes knurled screws ideal for situations where frequent disassembly and assembly are required, or where space limitations make using a screwdriver or wrench inconvenient.

However, the advantages of knurled screws extend beyond mere convenience. The knurl pattern also contributes to a stronger grip between the screw head and the user’s fingers, leading to improved torque application during tightening. This translates to a more secure fastening, particularly beneficial in applications where vibrations or jostling might occur.

Commonly Types of Knurled Screws

The world of knurled screws offers a variety of models, each tailored to specific needs and applications. Here’s a closer look at some of the most commonly encountered knurled screw models:

1. GB/T 834 Knurled Head Screws

Specifications: M1.6×3(P0.35), M2×3(P0.40), M2.5×3(P0.45), M3×3(P0.50)


  • These screws are commonly used in applications that require frequent disassembly and assembly.
  • The knurled design on the head provides extra grip, making manual tightening easier and more efficient.
  • They are ideal for applications where precision and ease of use are critical, such as in small electronic devices or delicate mechanical assemblies.
Knurled Head Screws

2. DIN 464-1986 Knurled Head Stepped Screws

Specifications: Various sizes available, such as M1.4×3(P0.30), M1.6×3(P0.35), M2×3(P0.40)


  • These screws feature a distinctive stepped head design that is suitable for specific spatial fastening requirements.
  • The steps on the head provide a firm and secure fit in tight spaces, making them ideal for precision instruments and machinery.
  • The knurled pattern enhances manual tightening, ensuring a reliable and consistent grip.

3. GB 70 Knurled Hex Socket Head Cap Screws

Specifications: M2×6(P0.4), M2.5×6(P0.45), M3×6(P0.50), M4×6(P0.70)


  • These screws have a hex socket design that allows for tightening with a hex wrench, providing higher torque and more secure fastening.
  • The knurled head makes them easy to handle manually, even in applications requiring significant force.
  • They are perfect for situations where space is limited, and a traditional screwdriver cannot be used, such as in confined mechanical assemblies.
Knurled Hex Socket Head Cap Screws

4. T-Type Knurled Bolts

Specifications: Customizable according to actual needs, commonly M4, M5, M6, etc.


  • The T-type design of these bolts offers superior locking effects, making them suitable for high-strength fastening applications.
  • They provide a secure fit in various materials and are often used in heavy machinery and construction.
  • The knurled pattern ensures that they can be easily tightened and loosened by hand, even under challenging conditions.

5. Polycarbonate (PC) Knurled Screws

Specifications: Various sizes, made from polycarbonate fiber (PC) with high transparency and lightweight characteristics.


  • These screws are specifically designed for applications requiring insulation, such as in the electronics industry.
  • The use of polycarbonate makes them lightweight and highly transparent, ideal for aesthetic and functional purposes.
  • The knurled head allows for easy manual tightening, ensuring a secure fit without the need for additional tools.
Polycarbonate (PC) Knurled Screws

Applications of Knurled Screws

The unique properties of knurled screws translate into a wide range of applications across various industries. Here are some prominent examples:

  • Furniture Assembly and Repair: The ease of finger tightening and disassembly makes knurled screws a popular choice in furniture assembly. They are frequently used for access panels, removable legs, and other components requiring frequent adjustment or disassembly. Additionally, the variety of available sizes and head styles allows for aesthetic integration into furniture designs.
  • Electronic Devices: The ability to tighten and loosen without tools makes knurled screws ideal for electronic devices where frequent access to internal components is necessary. They are commonly found in battery compartments, access panels for memory card slots, and securing removable covers on electronic equipment. Furthermore, for specific applications within electronics, the insulating properties of polycarbonate knurled screws make them a valuable choice.
  • Mechanical Assembly and Machine Maintenance: Knurled screws play a significant role in mechanical assembly and maintenance tasks. They are used to secure machine guards, access panels for lubrication points, and fasten various components that require occasional disassembly for adjustments or replacements. The ease of hand tightening allows for quick access and reduces reliance on tools in these scenarios.
  • DIY Projects and Hobby Applications: The user-friendly nature of knurled screws makes them a favorite among hobbyists and DIY enthusiasts. They are perfect for securing components in electronic projects, fastening removable panels in custom enclosures, and even creating adjustable stands or brackets. The variety of sizes and materials available caters to the diverse needs of DIY projects.
  • Sporting Goods and Outdoor Equipment: The secure fastening offered by knurled screws, particularly T-type models, makes them suitable for applications in sporting goods and outdoor equipment. They can be used to secure adjustable components on bicycles, tripods, or camera equipment. Additionally, their resistance to vibrations ensures a secure hold even in situations with movement or jostling.

Material for Knurled Screws

The material chosen for knurled screws plays a vital role in their performance and suitability for specific applications. Here’s a breakdown of some common materials used for knurled screws:

  • Stainless Steel: A popular choice due to its strength, durability, and corrosion resistance. Stainless steel knurled screws are ideal for applications exposed to harsh environments or requiring frequent disassembly and reassembly.
  • Brass: Offers a good balance of strength, corrosion resistance, and aesthetics. Brass knurled screws are often used in applications where appearance is a consideration, such as furniture or decorative hardware.
  • Aluminum: Lightweight and corrosion-resistant, aluminum knurled screws are suitable for applications where weight reduction is a priority. However, they may not be as strong as steel options.
  • Nylon or Acetal: These plastic materials provide lightweight, cost-effective options for knurled screws. They are ideal for applications in non-metallic environments and offer good electrical insulation properties.
  • Polycarbonate: As mentioned earlier, polycarbonate offers high transparency and electrical insulation, making it a valuable choice for electronic applications.
Brass T-Type Knurled Bolts

In conclusion, knurled screws are an essential component in a wide range of applications, from household furniture to complex mechanical assemblies. Their ability to provide a secure and easy-to-manage fastening solution makes them a preferred choice for professionals and hobbyists alike. Whether you are working in a home workshop, an industrial setting, or an electronics lab, knurled screws offer the versatility and reliability needed to achieve optimal results.

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