DYNA-THRED®

Dyna-Thred® II All Metal Type

400°F to +1200°F
Reusability per IFI 124 and MIL-F-8961

The unique, all-metal Dyna-Thred II design is a technological breakthrough in reliable self-locking fasteners. Extensive tests prove that the locking action of Dyna-Thred II fasteners maintains minimum torque requirements after more than 15 re-uses. The patented Dyna-Thred lock is formed of the fastener itself and requires use of no additional locking element materials. Locking action takes place in a full hoop, 360° around the thread, providing an equal load on all sides.

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The Dyna-Thred II lock is made by forming a close tolerance hole axially into the threaded end of a fastener. A controlled area of the cavity is dilated to expand the periphery of a controlled thread area. The pitch diameter of the first thread is left unchanged for starting ease. The result: an easily installed, highly reliable, self-locking bolt or screw. Dyna-Thred II bolts meet all the performance requirements of, and is qualified to, Specification MIL-F- 8961.

Use Dyna-Thred II fasteners whenever extreme heat and punishing vibration loosen or destroy other fasteners:

  • Airborne turbo-prop engines
  • Ground-based turbines
  • Commercial and military aircraft braking systems
  • Auxiliary power units
  • Rapid transit and rail subsystems

Military Specifications:
MIL-F-8961

Commercial Standards:
IFI 124, IFI 524 (Metric)

MaterialsTensile Strength, PSIOperating Temperature Range
Grade 5. Alloy Steel125,000 Minimumup to 1200°F
Grade 8, Alloy Steel150,000 Minimumup to 1200°F
A-286 CRES160,000 – 170,000up to 1200°F
Mild Carbon Steel55,000 Minimumup to 1200°F
300 CRES75,000 Minimumup to 1200°F
Inconel™ 185,000 Minimumup to 1200°F

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Long-Lok is part of Novaria Group, a cohesive family of precision component companies, that consistently delivers optimum performance and sustainable growth within the aerospace and defense marketplace.
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