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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
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.
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).
UNF – Unified National Fine Thread. Female and Male UNC/UNF threads are both parallel. The UNC/UNF flank angle is 60°. Unified threads comes in three different classes: for applications where a liberal tolerance is required to permit easy assembly even with slightly nicked threads.
UNC thread chart including major diameter, pitch diameter and minor diameter dimensions of UNC screw threads according to ASME B1.1 standard.
16 Μαΐ 2022 · Blog. Thread Chart (UNF-UNC) - Major and Minor Diameters. By Lee Lechner. May 16, 2022. There are various thread types and sizes to choose from these days. Occasionally, you need to know the dimensions associated with those threads, so we're developing posts like this one to make it easy for you.
SPEAK TO AN EXPERT. The table below shows the types of screw threads, sizes, and specifications of Unified Coarse (UNC), Unified Fine (UNF) and Unified Extra Fine (UNEF) threads. Thread sizes are not directly interchangeable. For guidance only. UNC. UNF. UNEF. Show entries. Showing 1 to 10 of 33 entries. Previous Next.
