Master Lock S3922 / S3923 / S3924 – Blind Flange Lockout Device
The blind flange lockout provides a physical safety solution for pipeline maintenance. It secures the blind in place and prevents removal until all padlocks are removed.
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Questions about this product?
The Master Lock S3922, S3923, and S3924 Blind Flange Lockout devices are designed as a best-practice solution for pipeline maintenance work.
They ensure that a blind installed on a pipeline remains securely locked during servicing.
An adjustable cup design allows the lockout device to fit securely over the flange.
Access to the nuts holding the blind in place is fully concealed and blocked.
Maintenance work can be performed with confidence.
The blind cannot be removed until every worker has removed their personal padlock.
Four dedicated locking holes allow multiple workers to apply padlocks at the same time.
This supports clear group lockout procedures and improves overall site safety.
The blind flange lockout supports consistent lockout-tagout processes.
It helps reduce risk during pipeline isolation and maintenance operations.
Features
- The device fully conceals flange bolts preventing access to the blind until all work has been completed
- The adjustable device provides a tight fit, adapting to multiple flanged pipe applications
- Recommended for use with nut diameter from 19mm to 28,5mm
- Four lockout holes allow for multiple workers to lockout device at one time
- Durable aluminum and hardened steel construction withstands conditions indoors and out





























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