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1/4 - 20 UNC : Basic Thread Dimensions (Pitch, minor & major diameters, depth, lead), Tolerance range for all applicable classes and much more.
13 Φεβ 2015 · The thread series is generally relative to the outside diameter of the screw. 20 threads per inch on a 1/4" diameter screw is considered coarse: 1/4-20 UNC. On a 3/4" diameter screw, 20 threads per inch is considered extra-fine: 3/4-20 UNEF.
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).
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.
ASME UN screw thread calculator to calculate imperial unified screw thread basic major, minor, pitch diameters and thread tolerance for the external (bolt) and internal (nut) inch threads according to ASME B1.1 standard.
The ThreaDoctor includes 4 sub-apps: Metric Thread Calculator, UN thread Calculator, NPT thread Calculator, and BSP thread calculator. United Inch Screw Threads Per ASME B1.1 UNC – Coarse pitch thread.
Example - Typical designation of an UNC thread. 1/4” x 20 UNC; US Bolts - Tightening Torques
