1 4 28 How big is the hole to be punched in the UNF ?

Target.

UNF stands for United Fine Thread. Some threads are UNC, and C refers to Coarse, i.e. coarse teeth.

The UN thread is a thread standard based on the imperial size jointly formulated by the United States, Britain and Canada, which is called a unified thread and is customarily called an American thread.

Because it is commonly used in the United States, while the United Kingdom still uses a self-contained thread: the imperial BS thread).

According to its pitch (number of teeth per inch), the unified thread has coarse threads (UNC), fine threads (UNF), ultra-fine threads (UNEF), special pitch threads (UNS), fixed pitch threads (4UN (4 teeth per inch, the same as UN, 8UN, 12UN, 16UN, 20UN, 28UN and 32UN), and for external threads, there are also UNR threads with a circular arc at the bottom of the teeth.

Coarse teeth: There is no need to mark the pitch.

Such as M8, M12 6H, M16 7H, etc., mainly used for coupling threads, compared with fine tooth threads, due to the large pitch, the thread lifting angle is also large, and the self-locking performance is poor, generally more with spring washers.

Combination: The pitch is large, the tooth profile is also deep, and the strength of the body is also greatly reduced. The advantage is that it is easy to disassemble and assemble, and the standard parts supporting it are complete and easy to interchange.

Fine tooth: the pitch must be marked to show the difference between the thread and the coarse tooth, the characteristics are just the opposite of the coarse tooth, in order to supplement the special use requirements that the coarse thread can not meet, and the fine thread also has a pitch series, which is mainly used in the hydraulic system.

Metric pipe fittings, mechanical transmission parts, thin-walled parts with insufficient strength, machine internals limited by space and shafts with high self-locking requirements, etc.

unf This is a fine pitch thread.

Drill the diameter and then tap.

The bottom hole sizes and tolerances are as follows:

Class 2b accuracy.

Punch diameter. The inner diameter is.

1 4 There are only 18 teeth and 19 teeth, and 28 teeth is the standard of Nagun. Non-threaded sealed pipe threads: 1 4-19, drill bits.

Inch taper pipe thread: 1 4-19, drill bit.

Inch taper thread: 1 4-18, drill bit.

Pitch: p = 1 inch (number of teeth per inch.)

Head chiral angle: 60°.

Triangle height: h=.

Working height: h=.

The large diameter (nominal source diameter) :d.

Middle diameter: e=.

Trail: k=d-2h=.

What is the diameter of the UNF1 4-28 punch?

What is the diameter of the UNF1 4-28 punch? Kiss! You have a good limb, I am happy to answer for you<> pro unf1 4-28 The punching diameter is the United States uniform fine tooth thread, the nominal diameter is 1 and 3 8 inches, 12 teeth per inch, the thread tolerance is 2b, the inner hole is the small diameter inch, the middle diameter inch.

Note: 1 inch = millimeter. 1 4-28unf bottom hole is the United States uniform fine tooth thread, nominal diameter 1 3 8 inches, 12 teeth per inch, thread tolerance with 2b, the inner hole is the small diameter inch, the middle diameter inch.

Note: 1 inch = millimeter. unf This is the diameter of the fine tooth thread drilling, and then the tapping 1 4 only 18 teeth and 19 teeth, 28 teeth is the standard of Naguni.

Non-threaded sealed pipe threads: 1 4-19, drill bits. Inch taper pipe thread:

1 4-19, Drill bit. Inch taper thread: 1 4-18, drill bit.

Pitch: p=1 inch (teeth per inch, tooth angle: 60° triangle height:

h=working height: h=large diameter (nominal diameter) :d medium diameter:

e=small diameter: k=d-2h=extended information: in the process of tapping the thread, the cutting edge is mainly to cut the metal, but there is also the effect of squeezing the metal, thus causing the metal to bulge and flow to the tooth tip, so before tapping, the hole diameter (that is, the bottom hole) should be larger than the inner diameter of the thread.

The diameter of the bottom hole can be found in the manual or calculated according to the following empirical formula: brittle material (cast iron, bronze, etc.): drilling diameter d0=d (thread outer diameter pitch) pitch) plastic material (steel, copper, etc.):

Drill to know the diameter of the code d0 = d (thread outer diameter) -p (pitch, I hope mine can help you <>

Do you have any other questions?

What is the diameter of the UNF1 4-28 punch?

Hello yo pro unf1 4-28 punch diameter. The inner diameter is. 1 4 There are only 18 teeth and 19 teeth, and 28 teeth is the standard of Nagun.

Non-threaded sealed pipe threads: 1 4-19, drill bits. Inch taper pipe thread:

1 4-19, Drill bit. Inch taper thread: 1 4-18, drill bit.

Pitch: p = 1 inch (the number of teeth per inch of stupidity.) Tooth Shaped Angle:

60°。Triangle height: h=.

Working height: h=. Large diameter (nominal diameter):

d。Middle diameter: e=.

Trail: k=d-2h=. I hope mine can help you [hee hee Yu Ran] <>

Summary. How big is the bottom hole of UNF1 2-24.

There's no answer.

Wait a minute, just send the wrong **.

Just help me find out how big the hole to make.

Okay, I'm looking for you!

The basic data of this model can not be found in the specific bottom hole, only to 1 2-20, do you look at the data of the last line?

The basic data of this model can not be found in the specific bottom hole, only to 1 2-20, do you look at the data of the last line?