UNSPSC 31161741: Internal wrenching nut

A cylindrical shaped nut that has the inner part processed in spline shape to use the opposite sides of the bearing side as used with the insertion wrench.

UNSPSC 31161741 Internal wrenching nut (Commodity) covers fasteners—specifically nuts in various thread sizes and configurations—that state and local governments procure for equipment maintenance, transit operations, and infrastructure repairs. The Dallas Area Rapid Transit Authority (DART) represents the primary recent buyer under this code, soliciting individual purchase orders for specific nut configurations including 5/8"-11 right-hand jam thread stainless steel structural nuts and #10-24 slotted stainless steel nuts. These are consumable fasteners for which transit authorities and similar operational bodies issue periodic RFQs with week-long response windows and strict FOB Destination freight terms; payment follows Net 30 from invoice or order receipt (whichever is later), and delivery timing and rate are grounds for default termination if unmet. The code's scope aligns with the direct procurement of small-quantity hardware for rolling stock, facility maintenance, and repair operations rather than bulk industrial supply.

Recent activity concentrates in Texas, with DART posting two relevant solicitations in 2026 (one posted August 4, 2026 with response due August 11, 2026; the other posted May 13, 2026 with response due May 20, 2026). A third posted opportunity from the City of Lavonia, Georgia—a water treatment plant construction improvement project (posted April 24, 2026, response due May 26, 2026)—references the UNSPSC code but involves civil construction scope unrelated to fastener procurement. DART operates as a repeat buyer of individual nut specifications through BONFIRE registration and bidding; no other state, county, or municipal issuing bodies appear in the recent activity block. Transit authorities and utilities managing infrastructure systems represent the likely customer base for this commodity, though the source shows limited geographic diversity in recent postings.