effective diameter of bolt or high-strength bolt

Fastening Bolt， Binding Bolt

reamer bolt [= rimer bolt]

taper bolt [= tapered bolt]

anti-upset device

be upset

Bit-upset rate

casing internal upset

center upset forging

clamp upset

cross-section orbital upset rate

current-on upset

die-upset magnets

Double-end upset forging

drill pipe upset

Eccentric upset forging

Electri upset forging machine

Electri upset forging technology

Electric Upset