DESIGN ENGINEERS’ O-RING SIZE GUIDE
Dual turn rings conform to MS 28782 and match the dash numbers of an AN 6227 series of O-rings. MS 28783 back-up rings match the dash numbers an AN 6230 O-rings. Good practice is to use a back-up ring on either side of the O-ring, even though the pressure on the ring may be from one side only. The only time you
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