DS 13R Slotted Round Union Nut

An internally threaded DS 13R slotted round retaining nut with external hook-spanner slots for assembling and releasing DS sanitary pipe unions. Supplied in SS304 and SS316L stainless steel across 1" to 4" nominal sizes.

Material options	SS304, SS316L
Size range	1"~4"
Interface series	DS
Connection	Union (Internal Rd Thread)
Shape	Round (Slotted Retaining Nut)

Size

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Slotted Round Retaining Nut Construction

The DS 13R union nut (drawing title Nut DS-13) is an internally threaded retaining ring with an inward shoulder and external perimeter slots for C-spanner engagement. When threaded onto a mating DS-15 male end, its internal shoulder draws the DS-14 liner against the union seal.

Although the series parameter table lists weld under its generic Connection row, the nut itself is a threaded fastener rather than a welded tube-end piece.

Material Grades & standard Dimensional Table

Available in SS304 and SS316L (AISI 304 and AISI 316L) with a stated surface finish of Ra < 0.8 μm, the dimensional drawing table covers seven sizes from 1" to 4".

Across the 1" to 4" range, bore A spans 35 mm to 116 mm, outer diameter B spans 57 mm to 148 mm, internal thread C spans Rd44×1/6" to Rd130×1/4", and axial height H spans 20 mm to 31 mm.

Hygienic Applications & Maintenance Access

Used in dairy, food, beer, beverage, fruit juice, and pharmaceutical process lines, the slotted round nut allows repeatable disassembly of DS union joints for routine cleaning and seal replacement.

Confirm that the mating liner shoulder diameter and male thread pitch match the standard row for the selected nominal size.