国上开我大修 Thread Profiles2 H -Crests 6 Flank 55 H -Roots- H=0.96p;h=0.64p;r=0.1373p 1.British Standard Whitworth(B.S.W.)thread 21 圈上拼我大修 47.5 H-113634p;h-0.6p;r-0.18083p 2.British Association(B.A.)thread 22
21 Thread Profiles2 1. British Standard Whitworth(B.S.W.)thread 22 2. British Association (B.A.)thread
圈上海人峰 60°4 H H H=0.866p 3.American National Standard thread 23 60° H=0.866p 内纹（螺母） 中径线 距P 蝶EP 内螺纹轴线 外螺纹线 4.Unified Standard thread 24
23 3. American National Standard thread 4. Unified Standard thread 24
圈 上濟发大学 58 eIp JouIW- 县 Axis of screw thread H=0.86603p 5.SI thread国际标准螺纹 25 圈上大逢 6.Square thread 26
25 5. SI thread 国际标准螺纹 26 6. Square thread
圈 上海大 0.3707p 7.Acme thread .bf 架纹掂性 8.SI and GB trapezoidal thread 27 国上玖大隆 H=1.5878t h=0.75t k1=0.86777t i=0.419t r=0.124271 r=0.05t H=0.89064p:A=0.50286p5f=0.24532p: 8=0.13946p:F=0.27544p:r=0.12055n 附图2-1米制锯齿形螺纹牙型 9.Buttress thread锯齿形螺纹 10.Metric Buttress thread 28
27 7. Acme thread 8. SI and GB trapezoidal thread 28 9. Buttress thread 锯齿形螺纹 10. Metric Buttress thread
国修 Design Profile of the nut and bolt H Bolt D D H d=D 6 H=0.86603p; D2=d2=d-0.6495p; D1=d-1.0825p;d=d-1.2268p; d=Diameter of nut:D=Diameter of bolt. 29 圈上拼大人生 Thread Form2,3 ·Types of thread forms >UNC =Unified National Coarse(粗牙螺纹) >UNF =Unified National Fine(细牙螺纹) >UNEF Unified National Extra Fine >UNS Unified National Special >UNR Unified National Round (round root) 30
29 Design Profile of the nut and bolt 30 Thread Form2,3 •Types of thread forms UNC = Unified National Coarse（粗牙螺纹） UNF = Unified National Fine（细牙螺纹） UNEF = Unified National Extra Fine UNS = Unified National Special UNR = Unified National Round (round root)