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Key Locking Thread Inserts: 9/16-18, Heavy Duty, 303 Stainless Steel (Pkg. of 3)
Part Number 76507
Key Locking Thread Inserts: 9/16-18, Heavy Duty, 303 Stainless Steel (Pkg. of 3)
Key Locking Thread Inserts: 9/16-18, Heavy Duty, 303 Stainless Steel, Pkg. of 3
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Product Specs:
  • Internal Thread Size: 9/16-18
  • External Thread Size: 13/16-16 
  • Wall Type: Heavy Duty
  • Length: 0.812"
  • Internal Thread Lock: No
  • External Thread Lock: Yes
  • Number of Locking Keys: 4
  • Material: 303 Stainless Steel
  • Tap Size: 13/16-16
  • Drill Size: 49/64"
  • Package Quantity: 3

Key Locking Thread Inserts are an ideal solution to repair stripped, damaged and worn threads or to provide thread reinforcement in a weaker parent material, especially when the mating stud or bolt will be removed frequently.  They provide strong, permanent threads in virtually any material - ferrous, non-ferrous, or non-metallic.  The insert's locking keys are driven down into the tapped threads of the parent material during installation creating a positive mechanical lock that prevents rotation due to vibration or torsion.
  Their external thread design provide maximum pull-out strength with a minimal outside diameter.

  • Only Standard Drill and Tap required.
  • Can be used in most materials...aluminum, magnesium, cast iron, carbon steel, stainless steel and plastic.
  • Simple installation compared to helical wire inserts.
  • Nearly impossible for the insert to turn after installation.
  • Nearly impossible to cross thread while installing.
  • Adhesive not required to hold insert in place.
  • Rarely affected by hot or cold temperatures because it is held in place mechanically.
  • Easy to remove.
Cross Reference:

Key Locking Thread Insert: 9/16-18 ID, 13/16-16 OD, 303 SST, Free Running

  • Chrislynn P/N: 76507
  • Keensert P/N: KNH918J
  • Mil-Spec P/N: MS51831-207
  • NAS Spec P/N: NAS1395C9
If you are currently using Keensert, Military Specification, or National Aerospace Standard part numbers for your inserts, please see our Cross Reference list above for an easy and accurate transition to our Rock Solid line of Key Locking Inserts from Chrislynn.  Step up to quality and value with this Made in the USA product!

Available Modifications to our Key Inserts:
  • Material - Carbon Steel, 303 Stainless Steel, 316 Stainless Steel, A286 Stainless, 4140 Alloy, Nitronic 60
  • Coatings - Dry Film, Cadmium, Silver Plating
  • Wall Thickness - Thin Wall, Heavy Duty Wall, Extra Heavy Duty Wall, Solid Blank (Outside Thread Only), Miniatures
  • Types - Free Running (Only External Lock), Locking (Both Internal & External Lock)
  • MS/NAS Certified - Produced to the following standards: MS51830, MS51831, MS51832, NAS1394, NAS1395, NA0146, NA0147, NA0148, NA0149, NA0150, NA0151.
For a comprehensive list of our available options, please visit our Key Locking Thread Insert summary page or call us toll free at (888) 835-0868.

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