Product Description
The HELI-COIL MS21209C0620L is a military-standard screw-locking tanged wire thread insert engineered to create high-strength, vibration-resistant internal threads in soft metal base materials. Precision-wound from corrosion-resistant 302/304 stainless steel, this 1/4-28 UNF thread insert features a 2.0D nominal length with a plain finish, incorporating an exclusive locking coil configuration that grips the mating fastener to prevent accidental loosening under severe shock, vibration, or thermal stress.
Screw-Locking Mechanism utilizes a resilient series of chords on the center coils that apply radial pressure to the mating screw, preventing vibration-induced loosening.
Mil-Spec Compliance meets rigid MS21209 military specifications to guarantee precise manufacturing tolerances and maximum reliability in critical aerospace and defense systems.
302/304 Stainless Steel delivers outstanding durability, high tensile strength, and heat resistance across challenging operating environments.
2.0D Nominal Length provides extended thread engagement depth to maximize load-carrying capacity and shear strength in low-density materials.
Precision Tanged Structure features a built-in drive tang to ensure efficient, repeatable installation using standard tanged insertion tooling.
NASM - Products meet Military Specifications (MS) and National Aerospace Standards (NAS) requirements as applicable and are shipped with appropriate documentation.
Product Specs
- SKU:
- MS21209C0620L
- Thread Size (Inch):
- 1/4-28 (0.250 Inch)
- Thread:
- UNF (Unified Fine Thread)
- Overall Insert Length (Decimal Inch):
- 0.500
- Tang:
- Tanged
- Material:
- 302/304 Stainless Steel
- Number of Free Coils:
- 11.25
- Length to Diameter Ratio:
- 2.0D
- Coating/Finish:
- Plain
