DIN-13R (DIN 11851) Rd-Threaded Slotted Round Union Nut

DIN-13R Slotted Round Collar and Rd Knuckle Threading

This DIN-13R slotted round union nut is the female tightening ring for DIN 11851 sanitary pipe unions. Machined with radial hook-spanner slots, an internal DIN 405 knuckle thread (Rd), and an inward rear shoulder (bore C), the nut captures a DIN liner (DIN-14 / 14S / 14R) and draws it onto a DIN-15 male part.

Materials, Finish, and Reference Datasheet Scope

The primary catalog page lists AISI 304 and AISI 316L (SS304 / SS316L) options with Ra < 0.8 μm finish across DN15 to DN150.

Tabulated Dimensions Across DN15–DN150 (A, B, C, D, Slots)

On the DIN-13R drawing (mm), OD A, thread B, bore C, and height D are: DN15 (44, RD 34×1/8, 25, 18), DN20 (54, RD 44×1/6, 31, 20), DN25 (63, RD 52×1/6, 36, 21), DN32 (70, RD 58×1/6, 42, 21), DN40 (78, RD 65×1/6, 49, 21), DN50 (92, RD 78×1/6, 62, 22), DN65 (112, RD 95×1/6, 80, 25), DN80 (127, RD 110×1/4, 94, 29), DN100 (148, RD 130×1/4, 115, 31), DN125 (178, RD 160×1/4, 138, 35), and DN150 (210, RD 190×1/4, 164, 40).

Thread Pitch Steps and Slot Count Checks

Note the three thread pitch zones (1/8" pitch on DN15, 1/6" pitch on DN20–DN65, and 1/4" pitch on DN80–DN150) and the transition from 4 slots (DN15–DN100) to 6 slots (DN125–DN150) when selecting hook spanners.