Kedu ule siri ike dị maka rivets kpuru ìsì?

Nnwale isi ike a na-ahụkarị gụnyere: Rockwell Hardness (HR), Surface Rockwell Hardness (HR), Vickers Hardness (HV), Micro Vickers Hardness (HV), Knoop Hardness (HK), Brinell Hardness (HB) , Leeb hardness (HL) (nkwughachi usoro), ultrasonic hardness test (UCI), Shore hardness (SHORE).

https://www.yukerivet.com/news/pull-rivets-include-aluminum-iron-and-stainless-steel-what-are-semi-stainless-steel-blind-rivets/