UNSPSC 31121521: Ductile iron shell mold machined casting assembly

Assembly of ductile iron object cast from shell molds that has been machined

UNSPSC 31121521 Ductile iron shell mold machined casting assembly (Commodity) covers the supply of ductile iron pipe, fittings, and related casting components that state and local water utilities procure for distribution infrastructure maintenance and expansion. Recent solicitations show water departments buying ductile iron pipe in bulk volumes for multi-year supply agreements, ductile iron repair parts and spools for ongoing operations, and fabricated components such as valve boxes, lids, and flanged pipe nipples to ANSI and AWWA standards. The code draws primarily from municipal water utilities—city water departments and county water resources divisions are the dominant issuing bodies—which use ID/IQ master agreements, RFQs, and informal written quotations to establish flexible, as-needed supply channels when exact quantities and delivery schedules cannot be fixed at contract award.

Recent activity concentrates in Texas and Georgia, with secondary activity in Wisconsin. The City of Dallas posted IFB BG2600030409 on May 14, 2026, for a five-year ID/IQ master agreement for ductile iron pipe supplying the Water Utilities department, with bid due June 12, 2026; Gwinnett County, Georgia issued three solicitations within two weeks in May 2026 (IWQ 131138 for repair parts, IWQ 130376 for spools, and IWQ 128859 for flanged pipe nipples with PE coating), all with five-day response windows typical of informal quotations; the City of Madison posted RFQ 5508-0-2026-BG on March 3, 2026, for ductile iron pipe in three diameter sizes (6, 8, and 10 inches) due March 17, 2026; and the City of Fort Worth released RFP 26-0068 on January 26, 2026, for cast iron valve boxes and lids on an as-needed basis, due February 19, 2026, with a 30 percent small business participation goal. Gwinnett County represents a repeat buyer across multiple commodity variants within this code, posting at least three separate solicitations for ductile iron components in a single month.