STUD-.250-20 X 1.38 LONG (P/N 25c-11) - New Surplus

The 25c-11 is a 1/4-20 plain steel stud, 1.38 inches long, designed for Lycoming engine assembly fastening. This stud secures critical engine components on Lycoming powerplants, providing reliable threaded connection under engine vibration and thermal cycling. Identified by NSN 5307-01-255-3095, it meets Textron Lycoming OEM specifications for piston engine installations.

Installation torque and replacement intervals are specified in the applicable engine maintenance manual and Illustrated Parts Catalog. Verify correct application before installation on your specific aircraft engine.

What is the STUD-.250-20 X 1.38 LONG (P/N 25c-11)?

The 25c-11 is a 1/4-20 plain steel stud, 1. 38 inches long, designed for Lycoming engine assembly fastening.

Does the 25c-11 meet AN/MS/NAS aviation specifications?

Aircraft hardware is manufactured to military and aviation specifications. The STUD-.250-20 X 1.38 LONG conforms to its applicable AN (Air Force-Navy), MS (Military Standard), or NAS (National Aerospace Standard) specification. Contact us for specific specification details.

What material is the 25c-11 manufactured from?

Aviation hardware is available in various materials including cadmium-plated steel, stainless steel, aluminum alloy, and titanium depending on the application. Contact us for material certification and specifications for the 25c-11.

Can I order the 25c-11 in custom quantities?

Yes, we sell hardware in various quantities from single units to bulk lots. The STUD-.250-20 X 1.38 LONG is available in: New Surplus. Submit an RFQ for volume pricing or call (904) 998-9101 for quantity availability.