Sold as an individual part, not a set of two nuts.


4-40 rail button nuts also available in 5 packs at a 20% savings versus individual price.


The easiest way to secure a forward mini rail button when a centering ring isn't an option.  These Rail Button Nuts conform to the diameter of the specified airframe, and include a tapered side (which faces aft) to reduce the chance of snagging the recovery train on deployment.  The Rail Button Nut arrived preassembled with the 4-40 thermal insert in place.  Simply drill a hole in the airframe, and install the mini-rail button and rail button nut.


Fits popular airframe sizes from 24mm/bt50 to bt60 in diameter.


No airframe, mini-railbutton or screw included.




Conformal Rail Button Nuts (4-40, ea)

  • Printed from a professional grade PETG plastic with a high Tg (Glass transition) of 76 deg C (169 deg F), so it will hold up to the most extreme flying site conditions.  All parts are solid (100% infill), so no internal voids or honeycombs.