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Requested Model Name M1 Garand gas cylinder plug B-147851
Category Hardware
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Supplier Part Number B-147851
Description M1 Garand gas cylinder lock screw https://www.uscarbinecal30.com/ricca_M1_Rifle_Gas_Cylinder_Lock_Screws.html Critical Note for Machining. If you hand a downloaded CAD file directly to a CNC machine shop, pay extreme attention to the thread specifications.The Thread Pitch: The M1 Garand gas cylinder plug uses a highly specific, non-standard historical military thread: 0.581"-24 NS-3 (National Special, Class 3 Fit).The CNC Risk: Many generic 3D CAD models found online simplify threads into standard plumbing or commercial sizes (like 9/16" or 5/8") to save rendering power.The Fix: Provide the machinist with the original Ordnance Drawing B-147851 alongside the CAD file so they can manually program the exact historical 0.581"-24 thread profile into their machine tool path.
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David R Brown,OWNER 
User since: 06/15/2026

Requests Posted: 1
Requests Filled: 0
Requested On 06/15/2026
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