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AS5781 size chart limitations?

thread2-500092

AS5781 size chart limitations?

AS5781 size chart limitations?

(OP)
Hello,
I'm wondering if anyone can explain the disparity between the range of gland sizes to backup ring sizes in AS4716 vs AS5781? For example, AS5781 -1XX sizes go from -104 to -139, but AS4716 gland sizes go from -104 to -149. Is there a reason that -140 through -149 are excluded from AS5781? Likewise for gland sizes -231 through -247. AS5781 states the BURs are designed specifically to AS4716, and I can't find any language anywhere to explain the absence of the larger diameters.
Thanks,
Speck
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