Bolt Applications
Pacific Scientific Energetic Materials Company
When Milliseconds Matter
Below we have some example applications utilizing the four different bolt types: Standard Explosive Bolts, Ridge Cut Bolts, Separation Bolts - Piston Actuated, and Hydrodynamic Bolts.
The loads shown are the proof load requirements and the design margins are typically 1.25x to 2x.
Standard Explosive Bolts
Helicopter emergency release using a single bolt with a dual bridgewire initiator.
Emergency Release 1.375" 90,000 LB
The submunition below uses five single bridgewire initiated bolts and redundancy was not required in this case. One bolt releases the parachute from the top canister and one each to release the four projectile skeets on the sides.
Parachute Release 1/2" 18,000 LB
Ridge Cut Bolts
In these two examples, ridge cut design was used in a Marman clamp (similar to a V-Band) to restrain and then to release a missile prior to launch.
Marman Clamp 9/16" 20,000 LB
A four-bolt system that is used for stage separation. Redundant initiators, in this case, into a transfer block which are used to ignite the transfer lines that go out to the four bolts.
Stage Release 9/16" 20,000 LB
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Separation Bolts - Piston Actuated
One piston actuated bolt releases the spacecraft from the upper stage.
Payload Release 3/8" 3,125 LB
And another, a 3-bolt system used to release the flight recorder.
Recorder Release, 3x 1/2" 7,000 LB
Hydrodynamic Bolts
These hydrodynamic bolts released the Solid Rocket Boosters from the shuttle and will be releasing them from the NASA SLS. Note the proof load strength of these bolts.
SRB Forward Release 3.4575" 217,500 LB
SRB Aft Release, 3x 4.75" 393,000 LB
In designing new systems, typically the first question we are asked in, "What size bolts do you have?"
Although we have many sizes of bolts, each bolt is designed for a specific application and tested to their unique shock, vibration, and temperature conditions. So, each bolt design must be reviewed and tailored against its intended applications.
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