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Femco No-Spill drain plugs are available in over 500 different sizes and thread patterns. Femco No Spill Systems makes plugs in UNF, UNS, UNC, BSW, Metric, BSP, and NPT thread patterns. Custom sizes are also available. The photo below shows our smallest plug (12mm) and one of our largest plugs (2 inches).
How to establish what size you need: Generally, the make and model number of the engine, transmission, or other piece of equipment will determine what size of drain plug you need. Occasionally, the year of manufacture could also be a factor in determining size. In rare cases, the serial number of the piece of equipment will have to be obtained and the equipment manufacturer or dealer will need to be contacted. If none of these options yield the size, the original plug will have to be removed and measured.
How to measure diameter: Drain plug diameter is best measure in millimeters using digital calipers. Measure the width of the plug across the base of the plug, at the widest part of the threads.
How to measure thread pitch: Thread pitch is either the number of threads per inch (SAE) or the distance between the threads in millimeters (Metric). You must use a thread pitch gauge to measure the thread pitch.
Size Listing: View our Common Heavy Duty Size Chart (.pdf) to see a list of sizes. For more detailed sizing please contact us directly.