Mar-Bro Manufacturing is a specialty cold former and a leading manufacturer of socket head fasteners. Integrity, customer service, quality, and dependability are the cornerstones of this family-run business. With a successful track record spanning more than thirty years, including international sales, Mar-Bro distinguishes itself as one of the most diversified shops in the United States.
Mar-Bro produces standards, specials, and military-spec fasteners with diameters from #00 - 5/8” (M1.6 - M16) and lengths from .050” - 8” (1.5mm - 320mm). The company’s product line of standards includes button head cap screws, flat head cap screws, hex head bolts, low head cap screws, socket head cap screws, socket head shoulder screws, and 12 point flange screws. Stainless steels, common alloys, and special alloys, including nickel alloys and A286, are among the materials utilized by Mar-Bro. All of Mar-Bro’s fasteners are American made, forged on-site at the company’s headquarters in Phoenix, Arizona. An in-house tool and die facility ensures quick turn-arounds when rush orders are required, and Mar-Bro maintains its own in-house laboratory which is A2LA accredited in accordance with ISO/IEC 17025. Mar-Bro is committed to distributor-only sales and their fasteners can be found in a wide range of industries including aerospace, automotive, oil and gas drilling, nuclear, semiconductor, and the military.