Related: What is the most expensive part of a rocket?

What parts of a launch vehicle, if any, are particularly inexpensive?

This can mean "similar in cost to common commercial-grade analogues", "not much of the cost fraction for their size or importance", or "a partially-reusable system, if it jettisoned this part but not others, could save a lot of money".

(I'm looking for components, not materials or individual parts).

  • 1
    $\begingroup$ Paint. Insulation foam. H2 and O2. $\endgroup$ Jun 13 '20 at 5:24
  • $\begingroup$ @user3528438 Insulation foam for rocket science can't be as cheap as commercial grade foam. Additional quality control and better material properties are not sold for nothing. $\endgroup$
    – Uwe
    Jun 13 '20 at 9:48
  • 1
    $\begingroup$ What's the distinction between "components" and "individual parts"? $\endgroup$ Jun 13 '20 at 12:23
  • $\begingroup$ @Organic Marble the answer isn't "a socket head cap screw" or "this one pipe manifold". $\endgroup$
    – ikrase
    Jun 13 '20 at 19:19

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