200以上 1/4-20 unc thread dimensions 330971-1/4-20 unc 2a thread dimensions
Metric External (Fasteners) Thread and Fastener Sizes M M50;Tap Chart UNC/UNF Threads Tap size NF/NC UNF/UNC Threads per inch Basic major dia (inches) Basic effective dia (inches) Basic minor dia of ext threads (inches) Basic minor dia of int threads (inches) Drill size 080 UNF 80 0600 0519 0447 0465 3/64 164 UNC 64 0730 0629 0538 0561 #54 256 UNC 56 0860 0744 0641 0667 #50 264 UNFExternal Thread Dimensions for Unified UNC Screw Threads Diameter Pitch TPI Thread Fit Class Major Diameter Pitch Diameter Minor Diameter Stress Area Max Min Max Min Max Min in² No 1 64 2A No 2 56 2A Electro Hardware 1 4 Unc Thread Uncoated Grade 302 303 Stainless Steel Round Knurled Thumb Nut Msc Industrial Supply 1/4-20 unc 2a thread dimensions