ND Pell-it is a pre-applied process which makes either male or female threaded fasteners of virtually any size, material or finish, self-locking. It involves drilling a hole into fastener threads and inserting a tough plug or pellet of nylon. It delivers outstanding performance in both high and low temperature extremes. Due to its compressibility, resilience and resistance to deformation, fasteners utilizing ND Pell-it processing can be repeatedly removed and adjusted.
Customer fasteners are first sent to ND for processing. Using custom equipment we drill a hole into the fastener threads, deburr any edges, then have the part sent out for re-plating if necessary. Next a tough plug or pellet typically made of nylon is inserted into the hole. Completed parts are shipped back to the customer. When assembled with a mating part the resilient pellet is compressed. This compression exerts a force 180° opposite, increasing metal to metal contact and holding the fastener in place without adhesives or thread distortion. The engineered plastic pellet provides locking action in the thread instead of at the bearing surface.
Resistant to vibration or reversal of stress. As long as the nylon pellet has been engaged, processed fasteners lock whether seated or unseated.
ND Pell-it processing meets or exceeds IFI Specifications 124, 524, and military Specification MIL-DTL-18240F Type N for temperatures up to +250°F (up to + 120°C).
Nylon is virtually impervious to a wide range of chemicals, water, and motor fluids. Will not dry, shrink, or lose resiliency when exposed to commercial solvents, alcohol, gasoline, oil, caustic soda, jet fuel, and many other chemicals.
Due to its resiliance, nylon pellet inserts can be adjusted and removed several times without substantially decreasing the fasteners locking ability.
Any female part can be Pell-itized by the ``twist`` method of spinning the Pell-it into a tapped hole from the O.D. of the part. ND Pell-it processing is particularly suitable for bearing retainer nuts.
Press-Fit fasteners with pellet inserts provide a close fit without expensive close tolerances. Replaces the need for extra parts, special grooves, clips, or retaining rings.