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www.ferrometal.fiDimensions for Metric ISO-threads, screws (6g) and nuts (6H):
Some common thread types are introduced in following table. The most typical thread is metric ISO-thread.
M Pitch
P
Screw, tolerance 6g
Nut, tolerance 6H
Major diameter d (mm)
Pitch diameter d2 (mm)
Pitch diameter D2 (mm)
Minor diameter D1 (mm)
max
min
max
min
max
min
max
min
2
0,4 1,981
1,886
1,721
1,654
1,830
1,740
1,679
1,567
2,5 0,45 2,480
2,380
2,188
2,117
2,303
2,208
2,138
2,013
3
0,5 2,980
2,874
2,655
2,580
2,775
2,675
2,599
2,459
3,5 0,6 3,479
3,354
3,089
3,004
3,222
3,110
3,010
2,850
4
0,7 3,978
3,838
3,523
3,433
3,663
3,545
3,422
3,242
5
0,8 4,976
4,826
4,456
4,361
4,605
4,480
4,334
4,134
6
1
5,974
5,794
5,324
5,212
5,500
5,350
5,153
4,917
7
1
6,974
6,794
6,324
6,212
6,500
6,350
6,153
5,917
8 1,25 7,972
7,760
7,160
7,042
7,348
7,188
6,912
6,647
10 1,5 9,968
9,732
8,994
8,862
9,206
9,026
8,676
8,376
12 1,75 11,966 11,701 10,829 10,679 11,063
10,863
10,441
10,106
14
2 13,962 13,682 12,663 12,503 12,913
12,701
12,210
11,835
16
2 15,962 15,682 14,663 14,503 14,913
14,701
14,210
13,835
18 2,5 17,958 17,623 16,334 16,164 16,600
16,376
15,744
15,294
20 2,5 19,958 19,623 18,334 18,164 18,600
18,376
17,744
17,294
22 2,5 21,958 21,623 20,334 20,164 20,600
20,376
19,744
19,294
24
3 23,952 23,577 22,003 21,803 22,316
22,051
21,252
20,752
27
3 26,952 26,577 25,003 24,803 25,316
25,051
24,252
23,752
30 3,5 29,947 29,522 27,674 27,462 28,007
27,727
26,771
26,211
33 3,5 32,947 32,522 30,674 30,462 31,007
30,727
29,771
29,211
36
4 35,940 35,465 33,342 33,118 33,702
33,402
32,270
31,670
39
4 38,940 38,465 26,342 26,118 36,702
36,402
35,270
34,670
Symbol
Name
Thread type or application
Marking
Flank angle Standard
M
Metric ISO-thread
Coarse thread
Right hand
M8 X 50
60°
ISO 724
(DIN 13-1)
M-LH
Fine thread
Left hand
M8 X 50 LH
M
Coarse thread
Right hand
M8 X 1 X 50
ISO 724
(DIN 13-
2…11)
M-LH
Fine thread
Left hand
M8 X 1 X 50
LH
M Metric conical male thread
Grease nipples
M20 X 1,5
cone
DIN 158-1
G
Non-sealing pipe thread
Female thread: symbol G
G 3/4”
55°
ISO 228-1
Male thread: symbol G and product cl.
A or B
G 3/4” B
R
Self-sealing pipe thread
Conical male thread
R 1½”
DIN 2999-1
DIN 3858
Rc
Conical female thread
Rc 1½”
Rp
Cylindrical female thread
Rp 1½”
Tr
Metric ISO-trapezoidal thread I.e. motion screws
Tr 50 X 8
30°
ISO 2901-4
Rd
Cylindrical round thread
I.e. fire equipment joints
Rd 20 X 3/4
DIN 405-1,2
ST
Self tapping thread
Self tapping screws
ST 3,5
60°
ISO 1478
UNC Inch size thread (USA)
Coarse thread
3/4-10 UNC
55°
ANSI B 1.1
B.S. 1580-1.2
UNF
Inch size thread (USA)
Fine thread
3/4-16 UNF
BSW Inch size thread (UK)
Coarse thread
3/4-10 BSW
B.S. 84
BSF
Inch size thread (UK)
Fine thread
3/4-12 BSF