Cage nuts:They obviously match the diameter and threading of the screws, and look like the following Metric:M5Thinner screw for lighter loads (5mm outside diameter, .8mm pitch) The longer ones are generally 20mm, and shorter is 16mm. This will be denoted as M5x16 or M5(16) vs. M5x20 or M5(20). M6Thicker screw for heavier loads (6mm outside diameter, .8mm pitch) Imperial:We still use them in the states, but it's probably the best plan to stop getting these, and only focus on the metric screws. UNF 10-32Standard imperial screw, .19" outside diameter, and 0.031250" pitch UNF 12-24Less used, thicker imperial screw. Outside diameter is 0.2160", and the pitch is 0.041667". References:
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