CoilThread Insert Platings & Coatings
KATO CoilThread (Tangless and tanged) Inserts are used in a wide range of Aerospace and Commercial applications. Although CoilThread Inserts are manufactured from Stainless Steel, many applications require additional protection from galling and/or corrosion. KATO offers CoilThread Inserts with various Platings and Coatings.
The following Platings and Coatings are the most commonly requested:
Dry Film Lubricant
The most versatile, and most popular, coating applied to KATO CoilThread (Tangless and tanged) Inserts is the Dry Film Lubricant. The Dry Film Lubricant is applied to limit galling between the insert and the fastener. The Dry Film Lubricant is a Molybdenum Disulfide applied in accordance with AS5272C (Type 1). On Locking or Free-Running inserts, the coating will be Dark Gray to Black in color (NASM8846).
In addition, Molybdenum Disulfide has inherent corrosive inhibiting qualities: Galvanic Corrosion Resistance – Independent testing indicates Molybdenum Disulfide may be suitable for certain applications requiring resistance from galvanic corrosion.
The suffix “W” is added to KATO part numbers (ex. 2TLC-02C-0086W) to signify the application of Dry Film Lubricant.
Silver-plating KATO CoilThread (Tangless and tanged) Inserts increases lubricity at higher temperatures. Silver plating is applied in accordance with customer requested AMS specifications. Commonly, AMS2410, AMS2411, or AMS2412. For additional specifications please contact the KATO Tech-Group. Cloudy White is the standard color.
The suffix “V” is added to KATO part numbers (ex. 2TLC-02C-0086V) to signify the application of Silver.
Electroless Nickel Plating on KATO CoilThread (Tangless and tanged) Inserts provides wear resistance and corrosion protection. Electroless Nickel is applied in accordance with AMS-C-26074, unless otherwise specified by the customer. Polished Silver is the standard finish.
The suffix “E” is added to KATO part numbers (ex. 2TLC-02C-0086E) to signify the application of Electroless Nickel.
Cadmium plating KATO CoilThread (Tangless and tanged) Inserts significantly increases corrosion protection. Cadmium plating is primarily used to protect against corrosion, but like Molybdenum Disulfide, helps decrease the coefficient of friction between the insert and the bolt to minimize galling.
Cadmium is applied in accordance with AMS-QQ-P-416. The identification colors vary depending on the type of inserts (locking vs. free-running). A supplemental Olive Drab to Dark Brown chromate is required to identify Locking Inserts. Gold to Yellow chromate is required to identify Free-Running Inserts (NASM8846).
Cadmium plating is meant to show no evidence of corrosion when exposed to a continuous salt spray test (96 hour ASTM B 117 test in accordance with NASM1312-1).
The suffix “Y” is added to KATO part numbers (ex. 2TLC-02C-0086Y) to signify the application of Cadmium.
Although passivation is not actually a plating/coating this supplemental treatment is sometimes required by the application. KATO passivates inserts in accordance with AMS2700.
KATO does not make it standard practice to passivate active stainless steel CoilThread Inserts. This minimizes the possibility of galvanic corrosion occurring when they are installed in aluminum or magnesium parent materials.
The suffix “A” is added to KATO part numbers (ex. 2TLC-02C-0086A) to signify the passivation requirement.
Additional KATO Insert Platings and Coatings:
Color Identifier Green – Add a “G” suffix to KATO part numbers (ex. 2TLC-02C-0086G) to signify green dye. The green dye is standard printers ink and may be removed with a cleaning solution.
Color Identifier Blue – Add a “B” suffix to KATO part numbers (ex. 2TLC-02C-0086B) to signify blue dye. The blue dye is standard printers ink and may be removed with a cleaning solution.
- All non-plated KATO Locking CoilThread Inserts (Tangless and tanged) are dyed red for identification in accordance with NAS1130, NA0276, and NASM21209. The red dye is standard printers ink and may be removed with a cleaning solution.
- Dry Film Lubricant and the Cadmium plating are called out in NAS1130, NASM122076, NASM124651, NASM21209, NA0276, MA3280, MA2181, MA3330, and MA3331. Any other coatings or platings will deviate from these specifications.