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Explosive Bolts | Sep Bolts.

E-Bolt | Explosively Actuated Bolt

PacSci EMC / Products / Cartridge Actuated Devices (CADs) / Explosive Bolts | Sep Bolts


Explosive Bolt Separation Bolt

Explosive bolts, separation nuts and studs are designed for missile, spacecraft and marine applications where rapid structure separation is demanded. Pressure actuated, ridge cut, piston actuated and hydrodynamic (pressure amplified) explosive bolts are available in a wide range of sizes, configurations and tensile capacities from as little as 200 pounds to as much as 1,000,000 pounds). Our experts are here to support you in meeting your structural loading, envelope and environmental requirements and guide you on ways to mitigate shrapnel and products of combustion.

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How Our Explosive Bolts Work

They are used for fastening mating components or devices together to then allow rapid structural separation when commanded. Explosive bolts feature machined geometries to control the separation location and breaking strength. An explosive charge, located within a machined cavity in the bolt, or externally for Piston Bolts (Propulsive Bolts), provides the energetic stimulus required to cleanly separate the bolt at the predetermined break plane. Three of the most common explosive bolt designs fabricated at PacSci EMC are the Standard Pressure Actuated Bolt, Ridge-Cut Bolt, and Piston Actuated Bolt (Propulsive Bolt); each of which exhibits unique advantages. Methods used for explosive bolt actuation will vary depending on the explosive bolts’ application requirements.


Explosive bolt applications can include, but are not limited to, clamp release mechanisms, bulkhead and component release systems, rocket and missile stage separation, flight termination, along with jettison applications such as consumed or damaged structures, solid rocket booster (SRB) and satellite release.


PacSci EMC Explosive Bolt designs are qualified and used for stage separation and release device for missile applications including Standard Missile 3, Range Extending Munitions Aero Packages, Solid Rocket Booster and main tank separation for the NASA shuttle, parachute deployment and mechanism release for weapon system.


  • Input Stimulus, Typical

    3.5 amp (when electrically initiated)
    TLX or SMDC input
    4.5 AMP/4.1 millisecond

  • Tensile Strength

    Up to 550,000 lbf

  • Operating Temperature

    Designs as low as -65 °F and up to +270 °F

  • Separation Time, Typical

    <10 milliseconds after application of All-Fire input stimulus
    <5 milliseconds at greater currents

  • Applicable Specifications

    Qualified for:

    • MIL-DTL-23659 Appendix A
    • Mil-C-83124
    • NASA NHB5300.4(1C)
    • Mil-STD-1512
  • Hermesticity (pre-function)

    Designs that comply with 1 x 10-6 cc He/sec at 1 atm


Explosive bolts sizes and configurations can be tailored to meet structural loading, envelope and environmental conditions requirements for specific applications.

Explosive Bolt Technical Envelope


Need more information or have a specific requirement you would like us to meet?
Email space@psemc.com or call (888) 995-5359.

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