Table of Contents

titanium alloy custom micro screws

Custom Micro Screws: 7 Factors to Consider for Your Precision Projects

When executing precision projects, the choice of fasteners can make or break the outcome. Among the plethora of options, custom micro screws stand out as the cornerstone of many high-tech assemblies.

In this guide, we’ll explore seven critical factors that demand your attention when incorporating custom micro screws into your precision projects.

From material selection to understanding supplier capabilities, AT-Machining insights ensure that your project’s integrity is never compromised.

What is the Custom Micro Screws

Custom micro screws, as I understand them, are specialized micro fasteners crafted with an extraordinary focus on precision, space optimization, and unwavering reliability.

These aren’t your everyday screws; they are micro screws, distinctively designed to cater to specific needs in industries where detail and precision are non-negotiable, such as electronics, medical devices, and aerospace.

In our experience, what sets these custom screws apart is their bespoke nature – tailored in materials, sizes, threading, and head styles to precisely align with the unique requirements of each project.

These micro fasteners are more than just components; they represent a commitment to precision engineering and customization, embodying the meticulousness needed in high-stakes applications.

Understanding Custom Micro Screws Material Selection

precision custom micro screws
Precision Custom Micro Screws

Material selection is crucial in determining the performance of micro screws in different environments. Common materials include stainless steel, titanium, aluminum, and brass, each offering distinct advantages.

Stainless Steel

Stainless steel micro screws are highly resistant to corrosion and rust, durable, and strong. They are capable of withstanding harsh environments and resist degradation even in humid or saline conditions. This material is also aesthetically pleasing, maintaining its appearance over time.

Carbon Steel

Carbon steel offers high strength and hardness, making it suitable for heavy-duty applications eg. Machine Screws. The carbon content can be varied to achieve different levels of hardness and strength. These screws are typically coated or plated to improve corrosion resistance.


Titanium screws are lightweight, extremely strong, and resistant to corrosion. They are biocompatible and non-magnetic, making them ideal for medical and aerospace applications. Titanium is also resistant to temperature extremes and saltwater environments.


Aluminum screws are known for their lightweight nature and good corrosion resistance. They form a protective oxide layer, which guards against corrosion. Aluminum is softer than steel and titanium, making it less suitable for high-stress applications but ideal for lightweight needs.


Brass screws offer good corrosion resistance, especially against water and steam. They are aesthetically pleasing with a golden color and are easy to machine. Brass is also a good conductor of electricity, making it suitable for electrical applications.


Nylon screws are lightweight, non-conductive, and resistant to corrosion. They are ideal for electrical and electronic applications and in environments where metal screws are not suitable. Nylon is strong for a plastic material but less so compared to metal screws.

Acetal (Polyoxymethylene, POM)

Acetal custom screws offer high hardness, low friction and excellent dimensional stability. They are durable, wear-resistant and suitable for precision mechanical applications that require smooth operation.

Polyvinyl Chloride (PVC)

PVC custom screws have a very high chemical resistance and are relatively low-cost. They are particularly resistant to acids, alkalis and solvents. PVC has a lower strength and stiffness than metal, but is suitable for applications where chemical resistance and non-conductivity are important.

Explore a wide range of materials suitable for custom screw machining. Contact us now for expert advice tailored to your specific needs!

Precision in Size and Tolerance

In the realm of custom screws, particularly micro fasteners and micro screws, precision in size and tolerance is paramount. This precision underscores the critical nature of exact measurements and minimal deviation during production. Custom micro screws demand rigorous conformity to specified dimensions, as any minor variance can greatly affect their function in sensitive applications.

The tolerance levels of these micro screws set the allowed range of size variations, ensuring a flawless fit in their respective components. Such precision is indispensable in sectors like electronics, aerospace, and medical devices, where precise alignment and secure fastening are critical.

Achieving high precision in the manufacturing of these custom screws is not just about meeting specifications; it’s about ensuring reliability and consistency in their performance. This level of exactness is vital for the success of complex projects, where every micro fastener plays a significant role.

Threading and Its Impact on Micro Applications

pom custom micro screw
POM Custom Micro Screw

The threading of custom micro screws, a vital feature of these micro fasteners, is crucial in defining their functionality and fit for various applications. The intricacies of thread design – encompassing pitch, depth, and profile – play a significant role in how the micro screw interacts with the material it secures.

In precision-focused fields like microelectronics or medical devices, finely threaded micro screws are often favored for their enhanced grip and strength. These fine threads ensure a secure fastening in slender materials without inflicting damage or undue stress.

Moreover, the thread design is instrumental in determining the ease of micro screw insertion and removal, along with its capability to resist loosening in situations involving vibration or stress – a critical consideration in high-performance and safety-sensitive environments like the aerospace and automotive sectors. Here, thread designs are meticulously crafted for optimal retention and resistance to vibrational forces.

Additionally, threading affects how the load is distributed on the micro screw, influencing its overall strength and resistance to wear. This aspect becomes particularly vital in scenarios where the screws undergo continuous loading and unloading, thereby impacting their longevity and consistent functioning.

In sum, the threading on custom micro screws represents a delicate balance in engineering, with each detail precisely tailored to fulfill the specific requirements of the intended application.

Custom Micro Screws Head Styles

design custom screw
Design Custom Screw

Designing the head styles of custom micro screws is a nuanced process that balances functionality, tool engagement, and application-specific requirements. The head style must be chosen based on the space constraints, the required torque, and the accessibility of the screw in the final assembly. For instance, in tight spaces, a flat or countersunk head might be preferable for a flush surface finish, whereas a pan or button head could be ideal for applications needing higher torque application without damaging the material surface.

Additionally, aesthetic considerations may influence the choice, especially in consumer products where the screws are visible. The material of the screw and the manufacturing method also play a role in determining the feasible head styles. The end goal is to create a head style that not only meets the mechanical and functional needs of the application but also aligns with the overall design and usability of the product.

Drive Types for Custom Screws

Custom micro screws come with various drive types, each offering unique advantages in terms of ease of use, torque transmission, and application specificity:

Phillips Drive: Characterized by its cross-shaped slot, the Phillips drive is widely used due to its self-centering feature, which reduces the chances of slippage. It’s ideal for automated production lines and is commonly found in consumer electronics and general assembly work.

Slotted Drive: The oldest and simplest type, slotted drives feature a single, straight slot. They offer straightforward operation but are more prone to cam-out. They’re typically used in applications where precise torque control is less critical.

Torx Drive: Known for its star-shaped pattern, Torx drives provide superior torque transmission with reduced risk of cam-out. This makes them suitable for high-precision applications in aerospace and electronics where consistent torque is crucial.

Allen Drive (Hex Socket): The Allen or hex socket drive features a hexagonal recess and requires an Allen key for operation. It offers excellent torque transmission and is widely used in machinery and automotive applications for its robust engagement.

Robertson Drive (Square Recess): This drive type has a square recess and is known for its high torque capacity and resistance to cam-out. It’s popular in woodworking and construction due to its strong hold and ease of use.

Tri-Wing Drive: The Tri-Wing drive, with its triangular slotted pattern, is often used in applications where security or tamper resistance is a priority, such as in electronic devices requiring controlled access for repairs or adjustments.

Each drive type is chosen based on the specific needs of the application, considering factors like torque requirements, ease of installation, and the need for security or tamper resistance.

Custom Micro Screw Manufacturing Method

swiss ultra machining screw parts
Swiss Screw Machining Custom Micro Screw Parts

Micro injection molding is used for producing micro screws made of plastic materials. It involves injecting molten polymer into a mold at high pressure.

CNC Machining

CNC (Computer Numerical Control) machining stands out as an exceptionally precise process for crafting machine screws, especially small screws, from solid material blocks. In this method, computer-controlled machines meticulously carve out micro screws, ensuring outstanding accuracy and intricate design capabilities. Such precision is crucial for fabricating custom micro screws with specialized geometries and stringent tolerances, perfectly aligning with the exacting demands of aerospace, medical, and electronics industries.

Swiss Screw Machining

Swiss screw machining, also known as Swiss turning, is particularly suited for making small, intricate parts like micro screws. It involves the use of Swiss-style lathes where the workpiece is held and rotated on a sliding headstock, allowing for high-precision and high-volume production. This method is excellent for creating screws with complex designs and fine details.

Cold Heading

Cold heading, or cold forming, is a process where metal wire is cut to length and then formed into a screw shape at room temperature. This method is efficient for mass production and is known for its ability to strengthen the material through work hardening. Cold-headed micro screws are commonly used in automotive and industrial applications.

Thread Rolling

Thread rolling is a process that forms threads by pressing a shaped die against a rotating workpiece. This method produces screws with stronger threads due to the grain flow following the thread shape, resulting in better fatigue resistance. It is ideal for manufacturing large quantities of durable micro screws.

Micro Injection Molding

Micro injection molding is used for producing micro screws made of plastic materials. It involves injecting molten polymer into a mold at high pressure. This technique is perfect for creating small, complex plastic screws with high precision, commonly used in electronics and medical devices.

Final Considerations: Cost vs. Quality Balance

stainless steel custom micro screw
Stainless Steel Custom Micro Screw

The final considerations of cost versus quality balance in custom micro screws are crucial in determining the overall success and sustainability of a project. When designing and selecting these precision components, it’s imperative to weigh the initial financial outlay against the long-term benefits of higher quality.

Opting for lower-cost screws might reduce immediate expenses but can lead to increased maintenance costs, more frequent replacements, and potential failure risks in critical applications. On the other hand, investing in higher-quality screws, although initially more expensive, often translates to enhanced durability, superior performance, and reduced downtime due to their higher tolerance levels and better material properties.

This balance is especially significant in industries where reliability and precision are non-negotiable, such as aerospace, medical devices, and electronics. In such fields, the quality of micro screws directly impacts the safety and functionality of the entire system.

Therefore, decisions should be based on a thorough analysis of the application requirements, environmental conditions, and the expected lifecycle of the product. The ideal approach is to find a middle ground that ensures the micro screws meet the necessary quality standards without excessively inflating costs, thereby achieving a cost-effective yet reliable solution for the specific application.


at machining

In conclusion, the intricacies of custom micro screws – from material selection, precision in size and tolerance, to threading and head styles – highlight the importance of meticulous design and manufacturing. Balancing cost with quality is crucial in ensuring that these small but vital components meet the rigorous demands of precision projects.

AT-Machining stands out in the field of precision engineering, specializing in the production of custom micro screws designed to meet specific needs. Our company dedication to superior quality, coupled with an in-depth expertise in the intricacies of micro screw manufacturing, establishes us as a top-tier provider for those in search of dependable, high-precision fastening solutions. For excellence down to the smallest detail, contact us at AT-Machining – your trusted partner in precision engineering.

photo 2

Hey there, I’m Sam!

From AT-Machining, I’m a CNC Machining Expert in this field for more than 20 years.  We offer cost-effective machining services from China. Ask for a quote for your ongoing or upcoming projects now!

Best Regards, Sam, Co-Founder

AT Machining

On-demand CNC Machining With Custom Finishes. You Design It, We'll Make It.