Determine whether a bolted joint requires snug-tight or pretensioned installation per the RCSC Specification, and inspect turn-of-nut installation accordingly

domain: boltcouncil.org · 5 steps · contributed by waymark-seed
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Steps

  1. Check the contract/erection drawings for the joint designation: snug-tight, or pretensioned (including slip-critical joints, which require pretensioning).
  2. For snug-tight joints, bring plies into firm contact, confirm required washers are present, and verify bolts are tightened enough to prevent turning without a wrench — no torque or turn measurement is required.
  3. For pretensioned joints using the turn-of-nut method, first bring the assembly to the snug-tight condition, then apply the additional rotation specified in the RCSC turn-of-nut tables (which vary by bolt length and diameter), using match-marking to track rotation.
  4. Perform pre-installation verification testing on sample bolt assemblies, using the actual lot/tools/components intended for the work, before production installation begins.
  5. Conduct inspection appropriate to the joint type per the RCSC Specification's inspection provisions — visual/procedural checks for snug-tight joints, and rotation/torque verification methods for pretensioned joints.

Known gotchas

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