Crown Equipment | Coil-Sert® Inserts

Helically Coiled Inserts are precision formed from a diamond shaped wire made out of 18-8 stainless steel (type 302/304). They are work hardened to a tensile strength above 200,000 to 250,00 P.S.I. and a hardness of Rc 43-50. The finished surface (8-16 micro inches) is smooth, which eliminates friction induced thread erosion. When installed into a tapped hole, the insert provides permanent conventional screw threads.

Helically Coiled Coil-Sert® Inserts are precison formed from a diamond shaped wire Screw Thread Inserts are available in Standard (Free Running ) and Screw-Lok Type.

Coil-Sert® Inserts are manufactured for :

Unified National Coarse (UNC)
Unified National Fine (UNF)
Metric
Pipe Thread
Spark Plug
Twin Insert
Oversized Insert
8-Thread Pitch

Coil-Sert® Helically wound inserts are generally made from:

304 Stainless Steel For General Application
Inconel X-750 Used in areas exposed to high temperatures, non-magnetic
Phosphorous Bronze Ideal for salt water applications, non magnetic
Nitronic 60® Gall Resistant, compatible with stainless steel screws, particle free and non-magnetic

Plating and Coatings

Dry Film Lubricant Provides additional lubrication in high friction applications, High temperature resistance 400° mildly corrosive, material Spec :AS5272, Color : Gray .
Cadmium Plating Military specifications purposes, cadium plating material, material spec :QQ-P-416, Type B, Color : Iridescent Yellow (Free-Running), Color: Olive (screw-locking)
Silver Plating Reduce galling of threads at high temperature, for use up 1200°F,Material Spec:QQ-S-365, Color : Silver –White.
Primer Free Contains no chromates, Eliminates need to zinc primers and epoxies, prevents galvanic corrosion between insert and parent materal.