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23 Φεβ 2024 · For the UNC version, the 1/4″ bolt will have 20 threads per inch, and you would use a tap drill that is approximately 5.35 mm in diameter. The pitch, or distance between threads, will be about 1.270 mm.
1/4 - 20 UNC : Basic Thread Dimensions (Pitch, minor & major diameters, depth, lead), Tolerance range for all applicable classes and much more.
For example, 1/4-20 means a thread with a pitch of 20 TPI (1/20=0.05″). It is also allowed to denote the pitch by distance. For example, 1/4-0.05P means a thread with a pitch of 0.05″ (same as 20 TPI).
Example - Typical designation of an UNC thread. 1/4” x 20 UNC; US Bolts - Tightening Torques
External Thread Dimensions for Unified UNC Screw Threads Diameter Pitch TPI Thread Fit Class Major Diameter Pitch Diameter Minor Diameter Stress Area ... 1/4” 20 2A 0.2489 0.2408 0.2164 0.2127 0.1894 0.03180 5/16” 18 2A 0.3113 0.3026 0.2752 0.2712 0.2452 0.05240 3/8” 16 2A 0.3737 0.3643 0.3331 0.3287 0.2992 0.07750 ...
UNC thread chart including major diameter, pitch diameter and minor diameter dimensions of UNC screw threads according to ASME B1.1 standard.
UNF Thread Chart (Unified Inch Screw Fine Thread Dimensions, Sizes, Diameters) Thread (in) Threads per inch (tpi) Major Diameter.
