Stein Seal Company

Stein Seal Company, a for-profit manufacturer of precision seals and sealing systems based in Harleysville, Pennsylvania, operates as a prime contractor (98% of awards) supplying metallic aircraft seals, seal assemblies, and specialized sealing components to the Department of Defense across full-and-open competition, with no SBA set-aside designations and no federal grant programs in the source record.

The company delivers concrete products across a narrow but deep product portfolio: metallic aircraft seals, carbon seal kits, plain encased seals, matched seal rings, shaft seal assemblies, seal replacement parts kits, and TF34 engine power takeoff bevel gear repair services. Representative prime awards include a $2.136 million firm-fixed-price purchase order from the Department of the Army Aviation and Missile Command (January 2026) for carbon seal components supporting the Black Hawk (UH-60L) helicopter program; a $2.0 million single-award indefinite delivery contract from the Defense Logistics Agency Aviation (August 2025) for metallic aircraft seals; and a $900,000 single-award indefinite delivery contract from DoD Aviation (March 2026) for metallic aircraft seals and related sealing components. Customer concentration is extreme: DLA Aviation anchors the portfolio at 582 awards worth $73.7 million combined potential value (54% of all dollars), followed by Department of the Army Materiel Command Aviation and Missile Life Cycle Management Command at $17.8 million across 17 awards, and DLA Land and Maritime at $11.1 million across 210 awards. The top five customer agencies account for 85% of combined potential value. Stein Seal holds 22 active prime indefinite delivery contracts, with ceilings ranging from $250,000 to $2.0 million, predominantly with DLA Aviation and DLA Land and Maritime; these IDCs support delivery-order-based procurement for aviation maintenance parts and aircraft engine components.

Activity has remained steady over the past five years: 42 awards in 2022, peaking at 70 in 2024, then declining to 46 in 2025 and 17 year-to-date in 2026—though the recent year pattern may reflect incomplete reporting for the current period. Combined potential value across all 1,872 awards totals $137.2 million, with $127 million (93%) obligated. Within the next twenty-four months, 13 awards with ultimate completion dates carry $2.9 million in combined potential value, representing recompete exposure.

In its subcontractor role, Stein Seal supplies aviation engine hardware and sealing components to General Electric Company (multiple sub-awards 2025–2026 for F110 and NGAP prototyping), Aerojet Rocketdyne (RS-25 engine production restart helium interpropellant seals, June 2025), RTX Corporation (F135 engine ECU risk reduction, May 2025), and Rolls-Royce Corporation (C-130 sustainment, quick engine change assembly repair and maintenance, prior awards March 2024). Sub-awards span engine component manufacturing, power-by-the-hour sustainment, and aerospace propulsion system support.

The company's federal work is overwhelmingly defense logistics and military aviation sustainment. NAICS distribution shows 788 awards in Aircraft Engine and Engine Parts Manufacturing and 318 awards in Gasket, Packing, and Sealing Device Manufacturing. PSC concentration leans heavily to Gas Turbines and Jet Engines, Aircraft (1,062 awards) and Packing and Gasket Materials (424 awards). Stein Seal competes without set-aside protections, holding a well-established position in the full-and-open defense supply base as a dedicated supplier of critical aerospace sealing components. The company manufactures at its Kulpsville, Pennsylvania facility and is registered in SAM.gov.

DESIGN, MANUFACTURE & TESTING OF CUSTOM MECHANICAL SHAFT SEALS FOR JET ENGINES, NUCLEAR, SHIP PROPULSION DRIVES, COMPRESSORS, TURBINES AND OTHER APPLICATIONS. SPECIALIZING IN DIFFICULT ADVANCED SEAL DESIGNS WITH HEAVY PRODUCTION CAPABILITIES; PRECISION MA