Lycoming Stud 31C-12

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These high quality exhaust studs are produced from cad plated steel in 5/16 x 18 standard thread size and length is 1.5" and are a direct replacement for the Lycoming 31C12 stud. T hese studs DO NOT feature a safety wire hole (refer to p/n 08-06780 for safety wire hole feature). FAA approved for all Lycoming engines from 0-235 through 0-540. Dimensions: .25X.25X1.5 Show more