Thread Rolling Die
Explore Thread Rolling Die product models, technical specifications and selection guidance below.
Product information
Overview
Technical Features
1、Selection of thread rolling wheel material for high hardness workpiece material
2、Machinable hardness up to HRC39-44
3、Special geometric parameter design of thread rolling wheel
4、Full dome round tooth bottom type, rounded end
5、Eating into the tooth and aligning the tooth surface for intensive treatment
6、Adding anti-wear chemical element co-extrusion process
Values should be verified during engineering selection.
Expanded Overview
Thread rolling dies for high-strength materials are heavy-duty tooling designed to cold-form threads on hardened and high-strength alloy workpieces — the grades used for structural bolts, wind-energy fasteners, and automotive safety components. Rolling hard materials flips the usual tooling logic: the die must be significantly harder and tougher than the workpiece, the tooth geometry must manage extreme contact pressure, and every pass must avoid cracking the thread root. Cold forming work-hardens the thread flanks further and leaves compressive residual stress at the root, which improves fatigue life — exactly what a high-strength bolt needs.
Series Motion’s high-strength tooling combines a die steel selected for hard workpieces with specialized tooth geometry: full-dome round tooth bottoms, rounded lead-in ends, and tooth surfaces treated to resist the abrasive wear that high-hardness blanks inflict.
Key Features
Hard-workpiece die steel — tooling material chosen specifically for rolling high-hardness blanks without premature tooth failure.
Full-dome round tooth bottom — rounded root profile that distributes stress and avoids crack initiation in the thread root.
Rounded lead-in teeth — eased tooth entry that starts the thread cleanly and reduces shock load on first contact.
Treated tooth surfaces — surface treatment that hardens the working flanks against abrasive wear from hard blanks.
Special geometric parameters — tooth angles and clearances designed for the springback behavior of high-strength steels.
Anti-wear alloy process — co-extrusion with anti-wear chemical elements to extend die life under severe contact conditions.
Typical Applications
High-strength structural bolts — construction and bridge fasteners in alloy steel grades.
Wind energy fasteners — large bolts for towers and nacelles under cyclic loading.
Automotive safety bolts — suspension, chassis, and wheel fasteners with strict fatigue requirements.
Alloy steel studs — threaded rods for pressure equipment and heavy machinery.
Anchor and foundation bolts — high-load threaded elements for civil engineering.
Selection Guide
Workpiece hardness is the first filter — it determines the die steel and whether pre- or post-heat-treatment rolling is appropriate. Then the thread standard and size, the blank diameter tolerance, the rolling machine’s force capacity (hard materials need more tonnage), and the production volume. Share the material grade and heat-treatment state of the blank; that decides the thread rolling die specification for high-strength work.
FAQ
How hard a workpiece can these dies roll?
Current product data lists machinable hardness up to HRC39–44. Feasibility also depends on thread size and machine force — share the blank specification for confirmation.
Does rolling improve the bolt’s fatigue life?
Yes. Cold forming leaves compressive residual stress at the thread root and an unbroken grain flow, both of which raise fatigue resistance compared to cut threads. This is one of the main reasons to roll high-strength fasteners.
Should I roll before or after heat treatment?
It depends on the final hardness. Rolling before heat treatment is easier on tooling; rolling after gives better dimensional control but demands tougher dies. Share your process route and the thread rolling die specification will be matched to it.
What affects die life on hard materials?
Workpiece hardness and consistency, lubrication quality, machine rigidity, and correct rolling pressure. Hard blanks punish any setup weakness, so machine condition matters more than with standard materials.
Word count: existing ~170 + new ~510 = ~680 total
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Advantages
Thread forming
Engineering selection support
Applications
Application-specific profile
Industrial machinery
