![WI backnuts photo](https://www.cmt-engineering.co.uk/wp-content/uploads/2018/08/WI-backnuts-photo.jpg)
![Backnut](https://www.cmt-engineering.co.uk/wp-content/uploads/2018/08/Backnut-150x150.jpg)
- Threads are to BSP parallel to ISO 7.1
- Because of the close tolerances required when match male and female parallel threads we recommend that parallel threads should be produced using a backnut as a gauge.
Dimensions and weights chart
![WI backnut table](https://www.cmt-engineering.co.uk/wp-content/uploads/2018/08/WI-backnut-table.jpg)
To download our data sheet as a PDF, please click the link below.