Mack Boring & Parts Co

Mack Boring & Parts Co, a Somerset, New Jersey-based small business Subchapter S corporation, supplies marine engine components and industrial parts to federal agencies as a prime contractor on purchase orders, delivery orders, and indefinite-delivery contracts, with placement across the Defense Logistics Agency (DLA), U.S. Coast Guard, and Department of the Navy. The vendor competes predominantly in full-and-open procurements without set-aside designation, though roughly one-third of its recent indefinite-delivery contracts carry total small business set-asides.

Mack Boring & Parts Co's federal footprint centers on discrete engine components, fasteners, seals, and related maritime equipment. Representative work includes a $22,951.80 delivery order from the Coast Guard (awarded May 2026) for Yanmar marine engine parts—150 impellers and 120 filter fluid units—with performance in Costa Mesa, California; a $28,765.80 purchase order from DLA Land and Maritime (October 2025) for electromagnetic actuators; a $64,574 delivery order from the Coast Guard (January 2026) for two Yanmar engines (Part Number 8LV350C) under a total small business set-aside; and a $12,791.52 purchase order from DLA Land and Maritime (December 2025) for fuel injector assemblies. The vendor also holds a $4.3 million multi-award indefinite-delivery, indefinite-quantity contract with the Coast Guard for Yammer engines and parts.

Customer concentration is severe and highly specialized. DLA Land and Maritime accounts for 1,944 awards carrying $37.5 million in combined potential value—94% of the vendor's recent award count by volume and 52% by dollar share. The Coast Guard places 201 awards valued at $20.6 million combined. DLA Aviation contributes 487 awards and $2.9 million. The top five customers account for 94% of awards across 29 customer agencies, but the two rankings align tightly—DLA Land and Maritime dominates both volume and dollars. The source data spanning 3,397 total awards (first in 1981, most recent May 2026) shows the vendor recently obligated $29.2 million against $72.5 million in combined potential value across all awards.

Mack Boring & Parts Co sits on a portfolio of single-award indefinite-delivery contracts with DLA Land and Maritime and DLA Aviation, each with $350,000 ceilings and total small business designations where applicable. The Yammer Parts IDIQ vehicle anchors the footprint at 37 task orders and $3.3 million combined potential value. Other named vehicles include Coast Guard IDIQ HSCG4012D50001 (34 task orders, $429 thousand), HSCG4010D50050 (24 task orders, $1.6 million), DLA contracts SPE4A616D6893 (19 task orders, $34 thousand) and 70Z04024D51601B00 (13 task orders, $1.5 million). These are discrete supply vehicles rather than multi-agency GWACs or BPAs; each appears tailored to specific component categories.

Activity has contracted year over year—305 awards in 2022 falling to 120 in 2026 (through May)—but the vendor's award-completion profile remains favorable. Only four awards face ultimate completion within the next twenty-four months, carrying combined potential value of $191 thousand, indicating minimal near-term recompete exposure. The vendor operates as a pure prime contractor; sub-award activity is negligible (one sub-award noted, a material purchase under a MAC IDIQ for unmanned surface vehicles).

The category concentration reflects a fastener and engine-parts distribution model. The top five NAICS categories by award count include Other Engine Equipment Manufacturing (769 awards), Bolt, Nut, Screw, Rivet, and Washer Manufacturing (666 awards), and Gasket, Packing, and Sealing Device Manufacturing (217 awards). Top PSCs are Packing and Gasket Materials (343 awards), Diesel Engines and Components (304 awards), and Engine Fuel System Components for nonaircraft applications (289 awards). This framing—narrow, tactical, repetitive small-dollar orders for standardized parts—positions Mack Boring & Parts Co as a specialized supply-chain node for DLA maritime logistics rather than a platform integrator or systems provider.