Uncompromising Performance

Few other industries face the high stakes of defense contractors—where hundreds of lives may be on the line with every product. In mission-critical situations, 100% readiness means high reliability is a must. At the same time, contractors are under pressure to minimize costs, providing lower life-cycle costs and extended operation. Meeting mil-spec demands for reliability, maintenance-free operation, and uncompromising performance under the harshest conditions is how we’ve built a 60-year reputation for excellence in defense.


We’ve developed thousands of new products (and reimagined conventional ones) for military aircraft, ground vehicles, weapons systems, and components such as coolant reservoirs, accumulators, thermal valves, volume compensators, and more. We design for extremes of temperature, pressure, and corrosive environments—especially when high lifecycle, zero leakage, maintenance-free operation and high performance are essential. Our process is fast and efficient, with full in-house resources, including: 3D solid modeling (rapid proof-of-concept), finite-element structural analysis, flow simulation and sizing—along with all required qualification and documentation to military specifications.

Fabrication & Testing

We bring our innovative designs to life in an advanced manufacturing facility where state-of-the-industry processes are executed under the highest standards. Seasoned technicians supervise advanced fabrication in:

  • Metal joining & forming with vacuum furnaces, and hydraulic presses to 1200-ton strength
  • Precision welding including methods such as TIG, laser, and electron-beam
  • Metal finish & metallurgy, with two automated cleaning lines
    featuring advanced cleaning, passivation and etching capabilities
  • Functional testing, including extreme environmental chambers, spring, tensile, and acceptance testing. Performance validation for all parameters.

Maintenance-Free Metal Bellows Accumulator & Reservoirs

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Download the active cooling 1-pagers to learn more about Senior Metal Bellow’s extensive range of product offerings designed exclusively for the Aerospace industry.


Thermal Management Solutions for Defense Industry


Innovation that goes beyond

Our customer was developing a new aircraft, which required a duct with a flexible connection. The incumbent design used a non-metal flexible seal which suffered significant performance degradations under high operating temperatures and required frequent replacement.

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Innovative approach replaces piston with bellows

The U.S. Air Force KC-135 Aerial Refueling Tanker was experiencing severe aircraft downtime due to a highly unreliable piston accumulator used on the fuel boom.

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