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The original type (designated as Type 1) calls for operation at 540 [[revolutions per minute]] (rpm). A shaft that rotates at 540 rpm has six splines on it, and a diameter of {{convert|1+3/8|in}}.<ref name="agproud">https://www.agproud.com/articles/32127-equipment-hub-understanding-power-takeoff-drivelines</ref>
Two newer types, supporting higher power applications, operate at 1000 rpm and differ in shaft size.<ref name="agproud"/> Farmers typically differentiate these two types by calling them "large 1000" or "small 1000" as compared to the Type 1 which is commonly referred to as the "540". All new types (2, 3, and 4) use [[involute]] splines, whereas Type 1 uses straight splines.<ref name="iso">https://cdn.standards.iteh.ai/samples/56698/4acca3e1ee5246fa8218c17d65da045f/ISO-500-1-2014.pdf</ref>
Inch-denominated shafts are round, rectangular, square, or splined; metric shafts are star, bell, or [[American football|football]]-shaped.<ref name="tulsa">https://www.driveshaftsoftulsa.com/blogs/news/the-different-types-of-pto-shafts</ref>
{|class="wikitable sortable
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| 540
| {{convert|1+3/8|in|disp=or|abbr=on}}
| 6 straight
|-
| 2
| 1,000
| {{convert|1+3/8|in|disp=or|abbr=on}}
| 21 involute
|-
| 3
| 1,000
| {{convert|1+3/4|in|disp=or|abbr=on}}
| 20 involute<!-- The "agproud" citation references this entire table
|-
|}<ref name="agproud"/>▼
| 4
| 1,300
| {{convert|57.5|cm|in}}
| 22 involute
▲|}<ref name="agproud"/><ref name="iso"/>
Due to ever-increasing horsepower requirements from farm implements, and higher horsepower engines being installed in farm tractors, a still larger type (designated as Type 4) has been added to ISO 500. It operates at a higher rotational speed of 1300 rpm in order to allow for power transfer at reduced levels of torque. The shaft has 22 splines with a major diameter of 57.5 [[millimeters]] (mm). It is meant to handle PTO powers up to 450 [[kilowatts]] (kW), or roughly 600 [[horsepower]] (hp).
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