How rolled and cut threads are produced

CJWinter describes thread rolling as a cold-forming process in which hardened dies shape a ductile blank without removing metal to create the thread. Thread cutting instead removes material. This distinction explains why a supplier must consider more than the finished thread diameter when proposing a route.

For an RFQ, separate the finished-part requirements from the proposed manufacturing method. State whether the drawing mandates a method or allows the supplier to recommend one. If a process is mandatory, identify the controlling drawing note or customer requirement. This avoids comparing an unrestricted quotation with one that includes a specific production constraint.

• Provide the complete thread designation and drawing revision.
• State any mandatory manufacturing-process requirement explicitly.
• Ask the supplier to identify assumptions and exceptions in its response.

Sources: CJWinter: Thread Rolling vs. Thread Cutting

Review material condition before choosing rolling

A rolling process needs material that can flow into the die profile. CJWinter identifies material properties and rollability as selection factors and notes that unsuitable hard or brittle materials may require cutting. Its discussion also describes cold working during rolling. These general observations should not be converted into a universal strength increase or a guarantee for an unspecified alloy.

Our purchasing recommendation is to give the supplier the specified grade and material condition, rather than only a broad name such as steel. Ask for confirmation that the proposed condition is suitable for the route. If the supplier proposes a change, send it through the responsible engineering approval process before releasing the order.

• Identify the material specification and required condition.
• Ask which material assumptions affect process feasibility.
• Keep proposed substitutions separate from approved order requirements.

Sources: CJWinter: Thread Rolling vs. Thread Cutting

Treat blank diameter and shoulder access as design inputs

Landis explains that rolling dies accept a specific volume of displaced material, making control of the prepared blank important. Its comparison also shows how the geometry of a rolling head can limit access near a shoulder, while other rolling attachments can serve different access conditions. A statement that rolling can never approach a shoulder would therefore be too broad.

For a custom stud or shoulder fastener, provide the full part drawing rather than a cropped thread detail. Ask the supplier to review the available tool access, thread length and transition region together. Where a feature needs clarification, request a marked-up drawing. Treat any proposed relief or geometry change as an engineering decision, not as an informal adjustment made during quotation.

• Show shoulders, transitions and the complete threaded region.
• Ask how the proposed tooling reaches the required thread end.
• Approve any drawing change before production begins.

Sources: Landis: Advantages of Rolling Threads and Application Considerations

Compare production requirements rather than slogans

Landis includes run length, changeover and tooling considerations in its comparison, while making clear that cutting can also serve long production runs. Quantity therefore belongs in the discussion, but it should not become a rigid rule that all small batches must be cut or every large batch must be rolled.

To make quotations comparable, request separate information about one-time tooling, sample approval and recurring supply. Give each supplier the same quantity assumptions. If the expected order pattern is uncertain, ask for more than one quantity scenario and label them clearly. Compare the quoted scope and acceptance requirements alongside the price; do not use an unsupported percentage saving as the basis for a sourcing decision.

• State prototype, first-order and repeat-order quantities where known.
• Clarify which tooling charges and sample activities are included.
• Compare like-for-like drawing revisions and documentation requirements.

Sources: Landis: Advantages of Rolling Threads and Application Considerations

A cutting route still needs controlled preparation and finishing

Sandvik Coromant's thread-turning guidance emphasizes workpiece diameter, chip control and tool condition. It also discusses burrs at the start or crest of a cut thread and the need to address them. Cutting is therefore a process to plan and control, rather than a way to avoid preparation or inspection requirements.

As a buyer, define what evidence is needed to accept the finished component. Ask the supplier to address the drawing's thread requirements and any specified burr or surface requirements in its inspection plan. This article does not prescribe cutting data, gauge limits or acceptance values. Those belong to the applicable drawing, specification and approved production plan.

• Agree on the required inspection records before placing the order.
• Make burr and surface requirements explicit where they matter.
• Ask how sample approval will be linked to the production drawing revision.

Sources: Sandvik Coromant: Thread turning application tips

Prepare a clear custom-fastener RFQ

For a discussion with Chuanghe Fasteners, send the complete drawing, material condition, thread requirements, finish specification, quantity assumptions and required documentation. Ask for a proposed route and a list of open questions. This is a recommended RFQ format; it does not assert that every process, material or thread geometry is an established factory capability.

Use the related manufacturing-route and tolerance guides to organize the discussion, then keep the final decision specific to the component. A useful response explains what is included, what needs confirmation and which changes require approval. The objective is a clear agreement on the finished part and its acceptance evidence, supported by an appropriate thread-making route.

Sources: CJWinter: Thread Rolling vs. Thread Cutting; Sandvik Coromant: Thread turning application tips