What does unef mean for threads?
unified extra fine
Unified form thread designations are represented by abbreviations such as UNC (unified coarse), UNF (unified fine), UNEF (unified extra fine), UNS (unified special) and UN (unified constant pitch), with the thread major diameter preceding the designation for example, 9/16” UNC, 9/16” UNF.
What is UNEF 2a?
UNEF ring gages are designed to inspect the external pitch diameters. All ring gages are available with Certificate of Accuracy documentation.
What is the difference between UNF and UNEF threads?
UNF (Unified Fine) is the same as UNC except that for each size of bolt, the number of threads per inch is higher, so the thread is finer. UNEF (Unified Extra Fine) is the same as UNF except that the number of threads per inch is even higher for each fastener size.
What is the difference between UNF and UNJF threads?
UNJ, UNJC, UNJF and UNJEF threads are almost identical to UN, UNC, UNF, and UNEF threads except that the external J thread has a much larger root radius than the standard UN threads and inspection must be performed on this element. The Special UNJ threads are designated by the nomenclature UNJS.
What is the pitch of a 1 UNEF thread?
UNEF Thread ANSI/ASME B1. 1
| Nominal Diameter | Major Diameter Inch | Pitch mm |
|---|---|---|
| 1″ – 20 UNEF | 1.000 | 1.270 |
| 1 1/16″ – 18 UNEF | 1.063 | 1.411 |
| 1 1/8″ – 18 UNEF | 1.125 | 1.411 |
| 1 1/4″ – 18 UNEF | 1.250 | 1.411 |
What does UNF 2A mean?
2-56 UNF 2A means it is a #2 thread (sometimes called also 0.086, as this is 0.086 inch) with 56 threads per inch, manufactured, dimensioned and checked according to Unified National Fine Standard and this is a normal external thread.
What does UNJF stand for in threads?
UNF = Unified National Fine thread series. UNJF = Unified National Fine thread series with external thread controlled root radius. UNEF = Unified National Extra Fine thread series. UNJEF = Unified National Extra Fine thread series with external thread controlled root radius.