Thread StandardsA 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 thread angle is 30°.
| Nominal Diameter |
Thread Size | Nominal Diameter mm |
Bolt Thread Minor Diameter mm |
Nut Thread Minor Diameter mm |
Pitch mm |
TPI |
| DN 10 | Rd 28 x 1/8" | 28.318 | 24.825 | 25.142 | 3.175 | 8 |
| DN 15 | Rd 34 x 1/8" | 34.318 | 30.825 | 31.142 | 3.175 | 8 |
| DN 20 | Rd 44 x 1/6" | 44.423 | 39.767 | 40.190 | 4.233 | 6 |
| DN 25 | Rd 52 x 1/6" | 52.423 | 47.767 | 48.100 | 4.233 | 6 |
| DN 32 | Rd 58 x 1/6" | 58.423 | 53.767 | 54.190 | 4.233 | 6 |
| DN 40 | Rd 65 x 1/6" | 65.423 | 60.767 | 61.190 | 4.233 | 6 |
| DN 50 | Rd 78 x 1/6" | 78.423 | 73.767 | 74.190 | 4.233 | 6 |
| DN 65 | Rd 95 x 1/6" | 95.423 | 90.767 | 91.190 | 4.233 | 6 |
| DN 80 | Rd 110 x 1/4" | 110.635 | 103.650 | 104.285 | 6.350 | 4 |
| DN 90 | Rd 120 x 1/4" | 120.635 | 113.650 | 114.285 | 6.350 | 4 |
| DN 100 | Rd 130 x 1/4" | 130.635 | 123.650 | 124.285 | 6.350 | 4 |
| DN 125 | Rd 160 x 1/4" | 160.635 | 153.650 | 154.285 | 6.350 | 4 |
| DN 150 | Rd 190 x 1/4" | 190.635 | 183.650 | 184.285 | 6.350 | 4 |
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