Plugs are extensively used in off-road, self-propelled work machines as defined in SAE J1116. Loss of these plugs, stripping of the threads, or failure to tighten because of difficulty in finding the right tool can result in serious damage and/or increased down time. All the plugs listed are nominal inch sizes pending the development of metric plug standards. The purpose of this document is to standardize and, therefore, minimize the number of sizes and types of drain, fill, and level plugs required. It also establishes types and sizes of pipe thread and straight thread plugs requiring commercially available hand tools for removal and installation. It is not intended to establish dimensions and materials.
SAE J371-2006 history
2016SAE J371-2016 Drain@ Fill and Level Plugs for Off-Road@ Self-Propelled Work Machines
2010SAE J371-2010 Drain, Fill, and Level Plugs for Off-Road, Self-Propelled Work Machines
2006SAE J371-2006 Drain, Fill, and Level Plugs for Off-Road, Self-Propelled work machines
1993SAE J371-1993 DRAIN, FILL, AND LEVEL PLUGS FOR OFF-ROAD, SELF-PROPELLED WORK MACHINES
1985SAE J371-1985 Drain@ Fill and Level Plugs for Off-Road@ Self-Propelled Work Machines
1978SAE J371A-1978 DRAIN, FILL, AND LEVEL PLUGS FOR EARTHMOVING MACHINERY