The BSW thread plug gauge GO/NO GO is an inspection instrument used to verify internal BSW threads in a fast and functional way. It is particularly useful whenever a numerical thread measurement is not required, but it is necessary to confirm immediately whether the internal thread is correct for the intended coupling and suitable for the required application.
BSW threads belong to the Whitworth system and are characterised by a 55° profile and coarse pitch. For this reason, the inspection must be carried out using an instrument consistent with both the diameter and the pitch of the thread being checked.
From an operational point of view, the inspection is performed directly inside the internal thread. The GO side must screw correctly into the thread, while the NO GO side must not pass beyond the permitted limit for a conforming thread. In this way, the gauge does not provide a numerical measurement, but a functional judgement useful for production inspections, in-process checks and final quality control.
This type of BSW thread plug gauge GO/NO GO is suitable whenever many components must be checked in a short time while maintaining a clear and uniform inspection criterion. It is therefore a practical solution in workshops, tooling departments and quality control environments, especially when working with internal Whitworth threads.
From an application point of view, the gauge can be used on threaded bodies, machined castings, fittings, mechanical components and parts intended for threaded assemblies where correct execution of the internal thread is essential for the final coupling.
From a manufacturing point of view, the BSW thread plug gauge is produced in hardened steel, providing good wear resistance during repetitive inspections. In addition to standard executions, versions for left-hand threads are also available on request.
In summary, the BSW thread plug gauge GO/NO GO is a reliable inspection instrument for checking internal Whitworth threads quickly, practically and repeatably.
Applications
- Inspection of internal BSW threads
- Functional verification of components with Whitworth threads
- In-process inspections on threaded bodies and mechanical components
- Inspection of fittings and components intended for threaded couplings
- Use in workshops, tooling departments and quality control
- Fast in-process inspections directly in production
- Verification of 55° profile coarse-pitch threads
FAQ – BSW thread plug gauge GO/NO GO
What is a BSW thread plug gauge GO/NO GO?
It is an inspection instrument used to verify the correct execution of internal BSW threads with a GO/NO GO system.
What is a BSW thread plug gauge GO/NO GO used for?
It is used to quickly check whether an internal Whitworth thread is conforming to the intended coupling.
How is the inspection carried out with a GO/NO GO thread plug gauge?
The GO side must screw correctly into the internal thread, while the NO GO side must not pass beyond the permitted limit for a conforming thread.
What does BSW mean?
BSW stands for British Standard Whitworth, characterised by a 55° profile and coarse pitch.
Why do BSW threads require a dedicated inspection instrument?
Because the inspection must be consistent with the Whitworth geometry, meaning that both the thread profile and pitch must correspond to the correct reference.
When is a BSW thread plug gauge GO/NO GO mainly used?
It is mainly used during production inspections, final checks and all situations where many internal threads must be checked rapidly and repeatably.
What does this instrument verify in practice?
It verifies the functional conformity of the internal thread in relation to diameter, pitch and profile.
Does the BSW thread plug gauge GO/NO GO provide a numerical thread measurement?
No, it is not intended to provide a numerical value, but to confirm in a practical way whether the thread is conforming.
On which components is it mainly used?
It is used on threaded bodies, fittings, mechanical parts and components using internal Whitworth threads.
What material is the BSW thread plug gauge GO/NO GO made from?
It is manufactured in hardened steel to provide good wear resistance during repetitive inspections.
Are special executions available?
Yes, left-hand thread versions are available on request.
Who is this instrument intended for?
It is intended for workshops, tooling departments, inspection and quality control environments that need to verify internal BSW threads quickly and reliably.
What are the most common mistakes when using a BSW thread plug gauge GO/NO GO?
The most common mistakes are using it on dirty or burred threads, forcing the NO GO side and using a gauge whose characteristics do not correspond to the thread being inspected.
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