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The Master Lock No. S3922 Blind Flange Lockout device is a physical, best practice solution for pipeline maintenance. The adjustable cup allows for a secure fit that conceals and locks out access to nuts holding a blind in place. Workers can perform maintenance with confidence that the blind they placed on a pipeline will not be removed until all workers have removed their padlocks. 4 locking holes allow for multiple workers to lockout device at one time.

  • Device fully conceals flange bolts preventing access to the blind until all work has been completed
  • Adjustable device provides a tight fit, adapting to multiple flanged pipe applications
  • Recommended for use with nut diameter from 3/4in to 1-1/8in (19mm – 28.7mm)
  • Four lockout holes allow for multiple workers to lockout device at one time
  • Durable aluminum and hardened steel construction withstands conditions indoors and out