L-umbrella head pull stud imsemmi fir-rivet għomja huwa stud tal-ġibda tar-ras tonda jew stud tal-ġibda tar-ras countersunk?

Umbrella head pull studs jissejħu wkoll round head pull studs u pan head pull studs.Ix-xifer tal-stud tal-ġibda tar-ras countersunk huwa 'l isfel, u l-stud tal-ġibda tar-ras tonda huwa 'l fuq.

https://www.yukerivet.com/news/does-the-product-have-to-be-countersunk-to-evacuate-round-head-rivets/