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Clamp-O-Tron Docking Port Sr.

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Clamp-O-Tron Docking Port Sr.
Part image
Docking port by
Found lying by the side of the road
Radial size Large
Cost (total) 980.00 Fund
Mass (total) 0.20 t
Drag 0.25
Max. Temp. 3400 K
Impact Tolerance 20 m/s
Research Meta-materials.png Meta-Materials
Unlock cost 12200 Fund
Since version 0.20
Part configuration dockingPortSr

The Clamp-O-Tron Sr. Docking Port is a port used for docking of two spacecrafts.



The left one can dock while the right is docked to the fuel tank.

Due to its large radius it provides a much more rigid connection than the small-sized Clamp-O-Tron Docking Port resulting in a lot less wobble. This makes it the preferred choice for docking very large and heavy vessels. Otherwise it is functionally identical to all other docking ports, but a lot heavier than them.

Note that in order to dock two spacecrafts, both must be equipped with docking ports of equal size. When constructing a spacecraft, another part which is not a docking port can be placed on it. That part can then be undocked, but not redocked.

Compared with the other docking ports, it is not obvious which side is the active one. Only the active side can be attached to the active side of another docking port of the same size or detach any part connected to it. The active side has more detail and a ring slightly smaller than the usual diameter. The picture to the left shows which side which should face outside.

Product description

The Clamp-O-Tron Sr. is the result of intense and costly development to answer the problem of how to make docking connections more sturdy. Thanks to the brilliant suggestion of the staff janitor "why don't you make 'em bigger?", the public now can enjoy the sheer thrill of docking enormous objects in space.

Strength against pulling apart

The strength of docking ports is hard to determine. In real life the strength of a docking port is depended by many factors, basically if you are folding the connection or just pulling it. But who cares about real world here?

  • At a force of 100 kN a little gap between the docking ports is formed. The gap is getting bigger with increasing force.
  • At a force of 1100 kN the docking ports are about a meter apart. Relating to a stress–strain curve this would be the elastic limit.
  • At 1120 kN (a little bit more than a J-2 engine used in the Saturn 5 rocket) the parts are moving slowly apart. This makes the game think the ship is getting longer. This is why the camera - pointing always the center of mass - is moving. At a distance of about 70 meters the docking port are being ripped apart (letting the camera flipping back).

The force on a docking port within a space ship (e.g. when you are pulling something) is much smaller than your engine force because the part being pulled is going with you. To be on the safe side one can use as a rule of thumb that the port stress is the force applied by the mass of the part that is pulled. More accurate would it is the force of the part pulling minus the force of the part that is pulled.


The different sizes of Clamp-O-Tron ports (standard, Jr. and Sr.) will not connect to each other.


  • Initial Release
Default parts
Jet engines Basic Jet EngineTurboJet EngineR.A.P.I.E.R. Engine
Liquid fuel tanks Oscar-B Fuel TankROUND-8 Toroidal Fuel TankFL-T100 Fuel TankFL-T200 Fuel TankFL-T400 Fuel TankFL-T800 Fuel TankRockomax X200-8 Fuel TankRockomax X200-16 Fuel TankRockomax X200-32 Fuel TankRockomax Jumbo-64 Fuel TankKerbodyne S3-3600 TankKerbodyne S3-7200 TankKerbodyne S3-14400 Tank
Liquid fuel engines LV-1 Liquid Fuel EngineLV-1R Liquid Fuel EngineRockomax 24-77Rockomax 48-7SRockomax Mark 55 Radial Mount Liquid EngineToroidal Aerospike RocketLV-N Atomic Rocket MotorLV-909 Liquid Fuel EngineLV-T45 Liquid Fuel EngineLV-T30 Liquid Fuel EngineRockomax "Poodle" Liquid EngineRockomax "Skipper" Liquid EngineRockomax "Mainsail" Liquid EngineR.A.P.I.E.R. EngineKerbodyne KR-2L Advanced EngineLFB KR-1x2S3 KS-25x4 Engine Cluster
Solid fuel rockets Sepratron IRT-10 Solid Fuel BoosterRockomax BACC Solid Fuel BoosterS1 SRB-KD25k
Monopropellant fuel tanks Stratus-V Cylindrified Monopropellant TankStratus-V Roundified Monopropellant TankFL-R1 RCS Fuel TankFL-R10 RCS Fuel TankFL-R25 RCS Fuel TankMk2 Monopropellant TankMk3 Monopropellant Tank
Monopropellant engines O-10 MonoPropellant Engine
Jet fuselages Mk1 Fuselage - Jet FuelMk2 to size 1 AdapterMk2 FuselageMk3 to Mk2 AdapterMk3 Fuselage
Fuel transfer FTX-2 External Fuel Duct