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The F in UNF stands for fine pitch.
On the other hand, the C in UNC stands for coarse pitch .
For example: 5/8-11 UNC (11 peaks between 1 inch) 5/8-18 UNF (18 peaks between 1 inch)
10A may be written in the place of the screw symbol for the pipe in the drawing.
This 10A refers to 3/8 of the size of the pipe screw.
○○A is a size expression in the piping standard.
The expression and combination in "inch size " like a unified thread are decided.
UNJC and UNJF screws are thread standards mainly used in the aircraft industry.
internal thread In machining, UNC and UNF taps or thread mills can be shared.
* UNJC and UNJF often use Class 3B (equivalent to Class 1) as aircraft screws, and it may be difficult to pass the thread accuracy if the tap is a standard tap accu
It is a mounting screw for a photographic lens for a movie camera specified by JIS, and 1-32U is referred to as a "C-mount screw".
The tap is a special product, but if you can use threadmill , you can process it with the multi-point type of chip interchangeable Hi-Pro threadmill (
Both PF and G are parallel threads for pipes, but the gauges have different dimensional tolerances. Therefore, it is possible to pass with a PF gauge but fail with a G gauge.
G and PF gauges cannot be shared.
Use the gauge as directed in the drawing.
WP stands for NOT-GO machine gauge of conventional JIS, and IP stands for NOT-GO inspection plug gauge.
NP is a symbol for the NOT-GO of ISO (current JIS), and there is no distinction between machine construction and inspection.
* GO is GP for both JIS
The limit gauge measures the fit, not the length correctly.
Since there is a chamfer and an incomplete pile at the tip of the thread, it is not possible to make an accurate judgment.
For example, the imperfection of both end faces of a parallel screw gauge depends on the size and pitch, but is not less than 3/4 turn and no more than 1 turn.
Tape
