A union (120) joins male (130A) and female (140B) subs of two flowline components (121A, 121B). The male sub (130A) includes a male end (131A) of one component (121A), a retainer collar (150), and a union nut (160). An annular boss (133) extends around a union face of the male end (131A) and provides a rearward-facing shoulder (134). The retainer collar (150) is carried on the male end (131A) and has a forward-facing shoulder (154) and a rearward-facing shoulder (153). The collar forward-facing shoulder (154) bears on the male end rearward-facing shoulder (134). The female sub (140B) includes a threaded female end (141B) of the other component (121B). The nut (160) is carried on the male end (131A) around the collar (150) and threads onto the female end (141B). It also has a forward-facing shoulder (163) which bears on the collar rearward-facing shoulder (153). The nut forward-facing shoulder (163) and the collar rearward-facing shoulder (153) are beveled. Thus, load from the nut (160) is transmitted through the collar (150) axially to the annular boss (133) and radially inward to the male end (131A).
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