Spring Lock Series

Hubbard Spring’s “Spring-Lock” series of core plugs have been engineered with a tapered edge that once installed creates a positive seal and prevents leakage.

The following plug characteristics have been engineered for maximum sealing effectiveness:

  • Press / interference fit with the cast / machined hole.
  • Taper needed for maximum “Spring-Lock” effect.
  • Surface finish of the drawn cup that seals against the bored hole.
  • Clear guidelines for measurement and qualification of all variables that relate to seal.