Mounting plates. 9.1. Class J mounting plates for fifth wheel couplings shall have circular mounting holes positioned as shown in Figure 16a if they are intended for standard fifth wheel couplings. However, the mounting holes shall be 17 mm +2.0 mm/ -0.0 mm diameter. The holes shall be circular, NOT slotted (see Figure 16a).
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Samples: unece.org, wiki.unece.org, wiki.unece.org
