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The L H DOTTIE CO MB34112 is a 3/4-10 x 1-1/2 inch hex head bolt designed for heavy-duty fastening applications in mechanical, electrical, and HVAC trade work. The 3/4-10 thread designation indicates a 3/4 inch nominal diameter with 10 threads per inch (UNC coarse thread), and the grip length is 1-1/2 inches. This bolt is sold individually and is intended for use by licensed tradespeople and contractors who require reliable, standard-pattern hardware for structural and equipment-mounting tasks.
This hex head bolt is suited for a wide range of commercial and residential trade applications, including equipment bases, structural brackets, conduit supports, and mechanical equipment mounting. Its coarse thread pattern makes it compatible with standard UNC-threaded nuts and tapped holes commonly found in HVAC curbs, electrical enclosures, and plumbing supports. The hex drive allows installation with standard socket or wrench tooling found in any trade toolkit.
Designed as an OEM-style replacement or standard hardware fastener for applications requiring a 3/4-10 UNC hex head bolt with a 1-1/2 inch length, suitable for use with any standard UNC 3/4-10 nut or tapped component.
Installation should be performed by a qualified tradesperson following applicable mechanical and structural codes. Always de-energize and lock out equipment before fastening hardware near electrical components. Use a properly sized socket or combination wrench to achieve adequate clamping force without over-torquing. Apply thread lubricant or anti-seize compound as required by the application environment.
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