Yes. As a custom fasteners manufacturer with over twenty years of experience, At HETAI, custom fasteners can be manufactured according to applicable ISO standards while accommodating customer-specific designs, dimensions, materials, and performance requirements.

Although custom fasteners are often designed with non-standard features, many of their technical requirements can still follow established ISO specifications. These may include dimensional requirements, thread specifications, mechanical properties, material requirements, and inspection methods.

The specific ISO standards depend on the fastener type, material, design, and intended application.

1. Which ISO Standards Apply to Custom Fasteners?

Several ISO standards are commonly referenced in the fastener manufacturing industry. Depending on the product, relevant standards may include:

• ISO 898-1: Mechanical properties of bolts, screws, and studs made of carbon steel and alloy steel.
• ISO 3506: Mechanical properties of corrosion-resistant stainless steel fasteners.
• ISO 4014: Hexagon head bolts with partial thread.
• ISO 4017: Hexagon head bolts with full thread.
• ISO 4032: Hexagon regular nuts.
• ISO 965: Tolerances for ISO metric screw threads.
• ISO 4042: Electroplated coating systems for fasteners.

These standards provide technical references for product design, manufacturing, and quality inspection. For custom fasteners, they can be applied to relevant features even when the overall product design is non-standard.

2. Can Custom Designs Follow ISO Requirements?

Yes. Custom manufacturing does not necessarily mean that every feature must be non-standard.

For example, a customer may require a specially designed bolt with a non-standard head shape or overall length while retaining an ISO metric thread. In this case, the customized dimensions can follow the customer’s engineering drawing, while the thread specifications can comply with the relevant ISO requirements.

Similarly, custom nuts, screws, studs, pins, and other precision hardware components can incorporate standardized dimensions or mechanical requirements where applicable.

At HETAI, we review customer drawings and technical specifications to determine which ISO requirements can be applied to each product.

3. Can Custom Fasteners Meet ISO Mechanical Property Requirements?

Yes, provided that the selected material, design, manufacturing process, and heat treatment are suitable for the required mechanical properties.

For carbon steel and alloy steel fasteners, ISO 898-1 is commonly used to specify mechanical property classes such as 8.8, 10.9, and 12.9.

For stainless steel fasteners, ISO 3506 provides relevant property classifications and requirements.

Depending on the application, mechanical testing may include:

• Tensile strength testing
• Hardness testing
• Proof load testing
• Other tests specified by the applicable standard

The required mechanical properties must be evaluated based on the actual product design and applicable standard. Not every custom fastener is suitable for every strength class.

4. How Does HETAI Control ISO Compliance During Manufacturing?

At HETAI, quality control is considered throughout the manufacturing process rather than only during final inspection.

Our production and inspection procedures may include:

• Reviewing engineering drawings and ISO specifications
• Verifying raw material requirements
• Controlling machining and forming processes
• Checking critical dimensions and thread accuracy
• Inspecting mechanical properties when required
• Checking surface treatments and coating requirements
• Conducting final inspections before delivery

Depending on the product and customer requirements, suitable measuring instruments and testing equipment are selected to verify product conformity.

5. What Information Should Customers Provide?

To manufacture custom fasteners according to ISO standards, customers should provide as much technical information as possible, including:

• 2D engineering drawings or 3D CAD models
• Applicable ISO standards and specific clauses, if known
• Material grade and mechanical property requirements
• Dimensions and tolerances
• Thread type, diameter, and pitch
• Surface treatment and corrosion-resistance requirements
• Quantity and intended application

If the customer is unsure which ISO standard applies, HETAI can review the drawings and discuss suitable technical requirements before production.

Custom ISO-Compliant Fasteners from HETAI

At HETAI, we understand that custom fasteners often need to combine special designs with internationally recognized quality requirements. Our team works with customers to evaluate product drawings, select suitable materials, determine manufacturing processes, and establish appropriate inspection procedures.

Established in 2001, HETAI specializes in manufacturing custom bolts, screws, nuts, and precision hardware components. We support custom fastener projects based on applicable ISO standards and customer-specific technical specifications, helping ensure that products meet their required dimensions, mechanical properties, and application needs.