IDF-13H Sanitary Hexagonal Union Nut with ACME Thread in SS304 / SS316L

Component Role & Hexagonal ACME-Thread Design

The IDF-13H hexagonal nut is the wrench-operated retaining collar for International Dairy Federation (IDF) sanitary pipe unions. Its internal collar slips over the rear of an IDF-14 welding liner, while its internal ACME threads mate with an IDF-15 threaded male end to compress the T-profile IDF union gasket.

Material Grades & Dimensional Scope

Available in SS304 and SS316L stainless steel across six nominal sizes from 1.0" through 4.0" (1.0", 1.5", 2.0", 2.5", 3.0", and 4.0"), the IDF-13H nut uses 8 TPI ACME threads on sizes 1.0" to 3.0" (34.34×8TPI ACME to 91.37×8TPI ACME) and 6 TPI ACME threads on the 4.0" size (122.05×6TPI ACME). Across the dimensional table, rear bore spans 30.5 mm to 112 mm, nut height is 30 mm (1.0"–2.5") or 35 mm (3.0"–4.0"), and across-flats hex width (SW) spans 46 mm to 133 mm.

Application & Ordering Notes

As a non-wetted external retaining component, SS304 is widely selected for washdown durability even when paired with SS316L wetted liners and male ends, though full SS316L nuts are also supplied. Confirm nominal IDF tube size and whether you need a hexagonal nut (IDF-13H) or slotted round nut (IDF-13R).