NIGP 07531: Grinders, Cylinder Hone and Valve Seat; Portable Boring Machines; Hones; And Boring Bars

NIGP 07531 Grinders, Cylinder Hone and Valve Seat; Portable Boring Machines; Hones; and Boring Bars is an Item code under which state and local governments procure directional boring (horizontal directional drilling) services for underground utility infrastructure installation and maintenance. Recent solicitations show the code captures work installing, extending, maintaining, and repairing water, sewer, natural gas, and wastewater systems through open-cut and jack-and-bore methods. Issuing bodies include municipalities and utility commissions. The City of Milton, Florida issued ITB 2026.05 in September 2026 for as-needed directional boring services on a unit-price, term-contract basis with response due July 22, 2026; bidders must hold Florida Certified Underground Utility and Excavation Contractor licenses and furnish all labor, equipment, drilling fluids, and consumables while the City supplies pipe and appurtenances. Work scopes under this code range from small-diameter (two to twelve-inch) residential utility bores to large-diameter (20-inch) effluent line construction requiring specialized pit excavation and railroad crossings under casing pipe.

Recent geographic activity centers in Florida and Georgia. The Fort Valley Utility Commission (Georgia) issued an RFP in July 2026 for design and construction of approximately 4,000 linear feet of 20-inch fusible PVC effluent pipe with approximately 185 linear feet jack-and-bored under a Norfolk Southern railroad line, with proposals due July 3, 2026. Contracts under this code typically require performance and payment bonds when anticipated work value exceeds state threshold amounts, carry minimum insurance requirements (often $1 million commercial general liability, auto liability, and pollution liability), and include liquidated damages provisions for mobilization delays and emergency response failures. Mobilization timelines are tight—five business days or less from purchase order issuance—and contractors commonly provide 24-hour emergency response on a seven-day basis. Initial contract terms run one year with renewal options contingent on satisfactory performance and funding availability.