Specifications of International Thread Standards

A pipe coupling for foods and chemistry according to DIN 11851, colloquially also called "Dairy Thread". It consists of a special clutch thread, the metric round thread according to DIN 405, which has coarse, rounded thread edges and is thus easy to clean. These pipe couplings are commonly used in the food industry.
The flank angle is 30°.

Nominal
Diameter
Thread SizeNominal
Diameter
mm
Bolt Thread
Minor Diameter
mm
Nut Thread
Minor Diameter
mm
Pitch
mm
TPI
DN 10Rd 28 x 1/8"28.31824.82525.1423.1758
DN 15Rd 34 x 1/8"34.31830.82531.1423.1758
DN 20Rd 44 x 1/6"44.42339.76740.1904.2336
DN 25Rd 52 x 1/6"52.42347.76748.1004.2336
DN 32Rd 58 x 1/6"58.42353.76754.1904.2336
DN 40Rd 65 x 1/6"65.42360.76761.1904.2336
DN 50Rd 78 x 1/6"78.42373.76774.1904.2336
DN 65Rd 95 x 1/6"95.42390.76791.1904.2336
DN 80Rd 110 x 1/4"110.635103.650104.2856.3504
DN 90Rd 120 x 1/4"120.635113.650114.2856.3504
DN 100Rd 130 x 1/4"130.635123.650124.2856.3504
DN 125Rd 160 x 1/4"160.635153.650154.2856.3504
DN 150Rd 190 x 1/4"190.635183.650184.2856.3504
Dairy coupling DIN 11851