Material Selection for Cold Formed Fasteners
Material selection must satisfy both manufacturing and final application requirements. A candidate material may offer the desired final properties but create forming, tooling, heat-treatment, surface-treatment, or supply constraints. The correct choice is therefore made with the drawing, forming sequence, downstream processes, and validation plan—not from a material name alone.
Five material questions to answer
- Can the material move through the required forming stages without unacceptable damage risk?
- What final mechanical and application performance is required?
- Will heat treatment be required, and how does it affect the sequence?
- What surface treatment or plating is needed for the application?
- Is the material condition and supply route compatible with controlled production?
Material selection is linked to geometry
A material cannot be evaluated independently from the part. Large section changes, demanding head shapes, sharp transitions, undercuts, and multi-stage deformation affect how much formability margin the process needs.
If the geometry and material combination creates risk, the engineering response may involve geometry optimization, a revised forming sequence, limited secondary machining, a different material condition, or another process route.
Downstream process interactions
| Process input | Question to resolve |
|---|---|
| Heat treatment | When does it occur, and which dimensions or properties require validation afterward? |
| Thread rolling | Is the material condition compatible with rolling and the chosen operation sequence? |
| Secondary machining | How does the material machine, and which datum relationships must be controlled? |
| Surface treatment / plating | What application requirement does it support, and how is final fit inspected? |
| Inspection | Which material and process records are required for the customer program? |
What to include in an RFQ
Provide the specified material or the performance requirement that led to it. If alternatives may be considered, state that clearly rather than asking the supplier to guess. Include downstream processing, operating environment, quality documentation, and validation requirements.