Gewinde-Elemente, Standardisierung
Introduction
Definitions
Metric threads
Other thread profiles
Recommended torque
 
Threaded elements / Other thread profiles

The CLUFIX® range of blind rivet nuts is also available in Unified Screw Thread profiles (UST), standard in the United States, Great Britain and Canada. This type of profile is coded UNC or UNF, depending on the pitch value:
- C: Coarse
- F: Fine

Autres filetages - Profil UST

Designation of a UST thread:
- Diameter in inches or fractions of inches (for example: ¼” - 1 inch= 25.4 mm)
- The specified pitch in number of threads to the inch (for example: 28)
- The UN symbol
- A letter, in accordance with pitch type (for example: C)
- A number designates the tolerance class, and the letter A or B indicates whether it is an internal or external thread.

For a screw or bolt: ¼” -28 UNF 2A
For a nut: 6-12 UNC 2B
The profile shape is identical to that of the metric profile.

Autres filetages - Désignation
Diameter in inches
Examples : ¼", 6...
Pitch (in number of threads per inch)
Examples : 28, 12...
Rond Vert UN symbol
Rond Violet Pitch type
F = Fine
C = Coarse
Rond Vert Tolerance class (1 to 3)
Rond Violet Tolerance thread gap
A = For threads
B = For internal threads

Tolerances:
For threads, there are 3 classes: 1A, 2A, 3A
For internal threads, there are 3 classes: 1B, 2B, 3B
Tolerance positions for the pitch diameters:

Autres filetages - Tolérances

The two tables below contain standardized dimensional data (ANSI B1-1-1974 standard) for inch-dimension UNC and UNF threads:

UNC   UNF
Thread
designation
Pitch in mm nominal Ø Ø pitch ?
N° 1 - 64 f 0.3069 1.854 1.598
N° 2 - 56 f 0.4536 2.184 1.890
N° 3 - 48 f 0.5292 2.515 2.172
N° 4 - 40 f 0.6350 2.845 2.433
N° 5 - 40 f 0.6350 3.175 2.764
N° 6 - 32 f 0.7938 3.505 2.990
N° 8 - 32 f 0.7938 4.166 3.650
N° 10 - 32 f 1.0583 4.826 4.138
N° 12 - 32 f 1.0583 5.486 4.798
1/4" - 20 f 1.2700 6.350 5.525
5/16" - 18 f 1.4111 7.938 7.021
3/8" - 16 f 1.5875 9.525 8.494
7/16" - 14 f 1.8143 11.113 9.934
1/2" - 13 f 1.9538 12.700 11.430
9/16" - 12 f 2.1167 14.288 12.913
5/8" - 11 f 2.3091 15.875 14.376
3/4" - 10 f 2.5400 19.050 17.399
7/8" - 9 f 2.8222 22.225 20.391
1 - 8 f 3.1750 25.400 23.338
1 1/8" - 7 f 3.6286 28.575 26.218
1 1/4" - 7 f 3.6286 31.750 29.393
1 3/8" - 6 f 4.2333 34.925 32.174
1 1/2" - 6 f 4.2333 38.100 35.349
 
Thread
designation
Pitch in mm nominal Ø Ø pitch ?
N° 0 - 80 f 0.3175 1.524 1.318
N° 1 - 72 f 0.3528 1.854 1.626
N° 2 - 64 f 0.3969 2.184 1.928
N° 3 - 56 f 0.4536 2.515 2.220
N° 4 - 48 f 0.5292 2.845 2.502
N° 5 - 44 f 0.5773 3.175 2.799
N° 6 - 40 f 0.6350 3.505 3.094
N° 8 - 36 f 0.7056 4.166 3.708
N° 10 - 32 f 0.7938 4.826 4.310
N° 12 - 28 f 0.9071 5.486 4.897
1/4" - 28 f 0.9071 6.350 5.761
5/16" - 24 f 1.0583 7.938 7.249
3/8" - 24 f 1.0583 9.525 8.837
7/16" - 20 f 1.2700 11.113 10.287
1/2" - 20 f 1.2700 12.700 11.875
9/16" - 18 f 1.4111 14.288 13.371
5/8" - 18 f 1.4111 15.875 14.958
3/4" - 16 f 1.5875 19.050 18.019
7/8" - 14 f 1.8143 22.225 21.046
1 - 12 f 2.1167 25.400 24.026
1 1/8" - 12 f 2.1167 28.575 27.201
1 1/4" - 12 f 2.1167 31.750 30.376
1 3/8" - 12 f 2.1167 34.925 33.551
1 1/2" - 12 f 2.1167 38.100 36.726

For specific applications, LA CLUSIENNE-CLUFIX offers custom-made thread profiles (gas, trapezoid, etc.).

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