Note: Heating fastener blanks for thread rolling
Objective:
Heating steel fastener blanks to 1500 °F (816 °C) for thread rolling
End Product:
steel fastener blanks
Equipment:
- Ambrell 5 kW induction heating system, equipped with a remote workhead containing two 1.25 μF capacitors for a total of 0.625 μF
- An induction heating coil designed and developed specifically for this application.
Materials:
H11 tool steel, A286 stainless steel, Titanium and 8740 alloy steel fastener blanks of various sizes. Typical size is 1 in (25.4mm) diameter, 1.5 in (38.1mm) long
Temperature:
1500 °F (816 °C)
Frequency:
214 to 216 kHz depending on part
Testing:
A four-turn helical coil is used to heat the shaft of the bolts to 1500 °F (816 °C). The 1 in (25.4mm) diameter H11 fastener blank requires 30 seconds to reach temperature. The heating cycles varies from 20 to 45 seconds depending on the size of the part.
Benefits:
-
Faster cycle times and extended tool life with preheat step
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Hands-free heating that involves no operator skill for manufacturing
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Using same coil for various size blanks
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Stronger and more fatigue-resistant threads

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