The 1/4-28 thread fitting is used on cars, light trucks, and industrial machinery. The SAE-LT thread conforms to the Society of Automotive Engineers Lubrication Threads specifications. Requires a tapped hole for installation.

 

Maximum Pressure is 8,000 PSI. All zinc dichromate fittings minimum 72 hours to red rust. All zinc fittings case hardened to Vickers HV1 or 83 min Rockwell 15N. All stainless steel fittings are type 303 stainless.