This is a sources sought notice for market research purposes only, not a solicitation, to identify potential suppliers for qualification and production of Fatigue Test Stand Spindles for a PTO shaft cyclic endurance test stand. The applicable NAICS code is 332721 with a 500-employee size standard, and the government is interested in responses from all small businesses, including 8(a), Service-Disabled Veteran-Owned, HUBZone, and Women-Owned small business concerns. Interested parties should submit a summary of qualifications, similar services provided in the past three years, and any teaming arrangements, with a clear delineation of work between prime and partners. Responses must be submitted in writing via email or mail to the designated contacts, and no questions will be entertained at this time. This notice does not constitute a commitment by the government, and no contract award will be made as a result of this sources sought.