Custom fasteners can be manufactured with many different thread types, depending on the application, material, load requirements, assembly method, and applicable standards. At HETAI, we manufacture custom bolts, screws, studs, nuts, and other special fasteners with different thread specifications according to customer drawings and technical requirements.

Choosing the correct thread is important because the thread directly affects assembly compatibility, load capacity, tightening performance, manufacturing accuracy, and service life. Common options include metric threads, Unified threads, fine threads, coarse threads, pipe threads, and other specialized thread forms.

Metric Threads

Metric threads are among the most commonly used thread types for custom fasteners. They are normally specified using the letter M, followed by the nominal diameter and thread pitch, such as M6 × 1.0 or M10 × 1.5.

Metric threads are widely used in machinery, automotive components, industrial equipment, electronics, and general mechanical assemblies. HETAI can manufacture custom fasteners with metric coarse or fine threads according to the required standard and application.

UNC and UNF Threads

For applications designed according to inch-based standards, Unified National Coarse (UNC) and Unified National Fine (UNF) threads are common choices.

UNC threads generally provide good assembly performance and are widely used for general-purpose applications. UNF threads have a finer pitch and can provide advantages where higher thread engagement, adjustment accuracy, or thinner materials are involved.

HETAI can produce custom fasteners using inch thread specifications when required by customer drawings or applicable standards.

Coarse and Fine Threads

Both coarse and fine threads can be used for custom fasteners.

Coarse threads generally have a larger pitch and are commonly selected for general mechanical assemblies. They can be easier to assemble and are often more tolerant of contamination or minor damage.

Fine threads have a smaller pitch and provide more threads per unit length. They can be useful when higher adjustment precision, greater tensile stress area, or stronger thread engagement is required for a particular application.

The choice between coarse and fine threads should be based on the complete application rather than thread size alone.

Pipe and Special Threads

Some applications require threads designed specifically for fluid, gas, hydraulic, or pneumatic connections. Depending on the application and required standard, different pipe thread systems may be used.

HETAI can also manufacture special or non-standard threads for customized mechanical components. These may include modified pitch, unusual diameters, special thread lengths, partial threads, or customer-specific thread profiles.

For special threads, an engineering drawing or detailed technical specification is particularly important because the thread profile, pitch, diameter, tolerance, and gauge requirements must be clearly defined.

Internal and External Threads

Custom fasteners can have either external threads or internal threads, depending on the product design.

Bolts, screws, studs, and threaded shafts normally use external threads, while nuts, threaded bushings, threaded inserts, and other components may use internal threads.

HETAI can manufacture both types and can combine threaded sections with other precision features such as shoulders, grooves, holes, slots, knurling, steps, or special heads.

How Does HETAI Choose the Right Thread?

At HETAI, we consider several factors before selecting or recommending a thread specification:

• Required thread standard
• Nominal diameter and pitch
• Internal or external thread
• Required thread length
• Assembly method
• Load and torque requirements
• Material and hardness
• Manufacturing process
• Thread tolerance and fit
• Surface treatment
• Operating environment
• Production quantity

Depending on the product, threads may be produced by thread rolling, thread cutting, tapping, CNC machining, or other suitable processes.

HETAI Custom Thread Solutions

There is no single thread type that is suitable for every custom fastener. The correct choice depends on the mechanical design, mating component, manufacturing requirements, and service conditions.

At HETAI, we can manufacture custom fasteners with metric, inch, coarse, fine, internal, external, and special thread configurations according to customer drawings and specifications. Whether you need a standard M-thread for industrial equipment or a completely customized thread for a special application, HETAI can help select the appropriate manufacturing process and produce the required Bu Lông Ốc Vít with consistent dimensions and thread quality.