This is a Sources Sought Notice for market research to identify companies capable of manufacturing or legitimately obtaining a specific castellated nut, NSN 5310-01-185-6230, currently supplied by SPS Technologies and Avibank. The notice is for informational purposes only and does not constitute a solicitation or commitment to award. Interested parties who consider themselves qualified are invited to respond. To become an approved source, companies must submit a Source Approval Request (SAR) package demonstrating their product is equal to or better than the current item. The SAR should be sent to the DLA SAR Program Office at 6090 Strathmore Road, Richmond, VA 23237.