1 / 10
Unr 2024 Holiday Calendar:  Dates You Need To Know! - lbz0scl
2 / 10
Unr 2024 Holiday Calendar:  Dates You Need To Know! - 8d281xc
3 / 10
Unr 2024 Holiday Calendar:  Dates You Need To Know! - 527f9oe
4 / 10
Unr 2024 Holiday Calendar:  Dates You Need To Know! - 47djkan
5 / 10
Unr 2024 Holiday Calendar:  Dates You Need To Know! - ywy1p97
6 / 10
Unr 2024 Holiday Calendar:  Dates You Need To Know! - qobnae9
7 / 10
Unr 2024 Holiday Calendar:  Dates You Need To Know! - uuzu6wi
8 / 10
Unr 2024 Holiday Calendar:  Dates You Need To Know! - 2wmjag8
9 / 10
Unr 2024 Holiday Calendar:  Dates You Need To Know! - fpjrhlp
10 / 10
Unr 2024 Holiday Calendar:  Dates You Need To Know! - a15o3y9


Un和unr有什么区,代表什么?un是英制统一螺纹,牙型角是60度,公称直径以英寸为单位。其中外螺纹牙底做成相应圆弧(半径为0. 12825p至0. 14434p)的用unr表示。粗牙的是unc,细 … Un,unf,unc;是英寸制统一螺纹的识别 un是英文unified national的缩写,属于统一螺纹的恒定螺距系列。unf是英文unified national fine的缩写,是统一螺纹细牙系列。unc是英文unified … Unr:外螺纹设计牙型根部必须为圆弧 (in order to reduce the rate of threading tool crest wear and to improve fatigue strength of a flat root thread, the design profile of the unr thread …