Designation of an ISO metric thread
The ISO metric thread is used for the majority of threaded components. Designation detail :
M symbol followed by nominal diameter (for example, d = 8) and pitch (for example P = 1.25) separated by the multiplication sign then followed by the grade (for example: 6) and the thread gap (for example g).
For a screw or bolt: M8 x 1.25 6g
For a nut: M8 x 1.25 6H
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Letter 'M' followed by nominal Ø d
Example : d = 8 mm |
Pitch (distance between two threads)
Example : P = 1.25 mm |
 Grade (3 to 9)
 Tolerance thread gap
e, f, g, h = For threads
G, H = For internal threads |
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For external threads, the gap is specified by a lower case letter, and for internal threads by a capital letter.
The tolerance system is expressed by fundamental tolerances which can be graded from 3 to 9 in accordance with diameter and by fundamental thread gaps marked H and G for internal threads, and e, f, g and h for external threads.
The LA CLUSIENNE-CLUFIX nut-type product families comply with the 6H tolerance system.
The LA CLUSIENNE-CLUFIX screw or bolt-type product families comply with the 6g tolerance system.
The table here after contains the ISO standardized dimensional thread data.
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| d = D = nominal diameter |
d2 = D2 = d - 0.6495 P |
P = Pitch |
H1 = 0.5412 P |
| d1 = D1 = d - 1.0825 P |
d3 = d - 1.2268 P |
H = 0.866 P |
r = 0.1443 P |
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All LA CLUSIENNE-CLUFIX component families complie with the ISO metric threads above.
Nominal dimensions (including pitch) of screw, bolt and nut families, are specified in the first column of the products data sheets.
The dimensions of standard external and internal threads of LA CLUSIENNE- CLUFIX products are compliant with the ISO 262 standard (ISO metric threads for general use - Selection of dimensions for screws, bolts and nuts).
Standardized dimensions (NF ISO 261 - NF ISO 262) |
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| d or D |
Coarse pitch thread (screws, bolts and nuts and other common applications)
6H/6g tolerances (µm) |
Fine pitch thread |
| Pitch |
Core
section mm² |
d2 = D2 |
Tolerances on d2 |
Tolerances on D2 |
D1 |
Tolerances on D1 |
Recommended
fine pitches |
| Max. |
Min. |
Max. |
Min. |
Max. |
Min. |
2 |
0.4 |
1.79 |
1.740 |
- 19 |
- 86 |
+ 90 |
0 |
1.567 |
+ 112 |
0 |
0.25 |
| 2.5 |
0.45 |
2.98 |
2.208 |
- 20 |
- 91 |
+ 95 |
0 |
2.013 |
+ 125 |
0 |
0.35 |
| 3 |
0.5 |
4.47 |
2.675 |
- 20 |
- 95 |
+ 100 |
0 |
2.459 |
+ 140 |
0 |
0.35 |
| 4 |
0.7 |
7.75 |
3.545 |
- 22 |
- 112 |
+ 118 |
0 |
3.242 |
+ 180 |
0 |
0.5 |
| 5 |
0.8 |
12.7 |
4.480 |
- 24 |
- 119 |
+ 125 |
0 |
4.134 |
+ 200 |
0 |
0.5 |
| 6 |
1.0 |
17.9 |
5.350 |
- 26 |
- 138 |
+ 150 |
0 |
4.918 |
+ 235 |
0 |
0.75 |
8 |
1.25 |
32.9 |
7.188 |
- 28 |
- 146 |
+ 160 |
0 |
6.647 |
+ 265 |
0 |
0.75 - 1 |
| 10 |
1.5 |
52.3 |
9.026 |
- 32 |
- 164 |
+ 180 |
0 |
8.376 |
+ 300 |
0 |
0.75 - 1 - 1.25 |
| 12 |
1.75 |
76.2 |
10.863 |
- 34 |
- 184 |
+ 200 |
0 |
10.106 |
+ 335 |
0 |
1 - 1.25 - 2.5 |
| 14 |
2.0 |
105 |
12.701 |
- 38 |
- 198 |
+ 212 |
0 |
11.835 |
+ 375 |
0 |
1 - 1.25 - 2.5 |
| 16 |
2.0 |
144 |
14.701 |
- 38 |
- 198 |
+ 212 |
0 |
13.835 |
+ 375 |
0 |
1 - 1.5 |
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