UNSPSC 31161738: Keps nut or K nut

Also called a K-nut or washer nut. It is a nut with an attached, free-spinning washer used to make assembly more convenient

UNSPSC 31161738 Keps nut or K nut is a Commodity code under which state and local governments procure elastic stop nuts and related fastening hardware for operational maintenance and infrastructure projects. Recent solicitations show a mismatch between the code's nominal focus and the work actually being tagged: most postings involve routine purchase orders for standard nuts, washers, and industrial fasteners (Grade 8 nuts, M8 hex fasteners, elastic stop nuts in unit quantities), while one large construction project—modifications to a municipal water treatment facility—has been tagged to this code despite encompassing comprehensive civil engineering work well outside the fastener scope. The issuing bodies include transit authorities (Dallas Area Rapid Transit Authority leading with four separate nut and fastener procurements in January 2026), a municipal government (City of Lavonia, Georgia), and a county procurement office (Riverside County, California). The DART postings dominate recent activity, all requiring FOB Destination pricing with freight included, Net 30 payment terms, BONFIRE registration for bid submission, and strict on-time delivery performance.

Recent opportunities span Texas, Georgia, and California. DART has posted solicitations for 1/4-28 zinc-plated elastic stop nuts (Solicitation 2097736, due February 5, 2026), 9/16"-18 Grade 8 nuts in boxes of 25 (Solicitation 2097554, due January 28, 2026), and other fastening components with one-week to two-week response windows. The City of Lavonia posted an IFB for Water Treatment Plant 2026 Improvements (Solicitation PE66940NONST2026000000005, due May 26, 2026), a substantial civil construction project with a pre-bid conference scheduled May 7, 2026, subject to Davis-Bacon prevailing wage, Build America Buy America Act compliance, 4.0% DBE participation goals, and a nine-month schedule—a stark mismatch with the fastener code. Riverside County issued an RFB for Cla-Val parts inventory (RFB3909, due February 13, 2026) without detailed specifications disclosed. No award values or contract amounts appear in the available documentation across any posting.