G
Gordon Clarke
I need some help J
I’d like to start a new forum or “thread”, but how do I go about it? I know this isn't the correct forum or thread, but there doesn't seem to be anything entitled "Start a new thread"
I’m thinking of a title like:
Practical Screw Thread Information & Tolerances
for people to exchange information on all types of screw threads.
Here’s an example of the kind of thing I’d intend putting in it (and I have much more on other thread types):
Important:
These table are made as a guideline for calculating nominal pitch diameter and pitch diameter tolerances. As the primary purpose is to measure with a digital caliper, most dimensions are calculated to the nearest 0.01 mm.
When a tolerance in a table is used, it should be remembered that the tolerance will often be slightly larger for a finer pitch than standard. i.e. the pitch diameter tolerance for M60x2 is larger than for M36x2, which again is larger than that for M16x2 – which is standard.
For exact tolerances use the relevant, approved standard.
Pitch diameter tolerances
Thread
Bolt (6g)
M16x2
M36x2
M60x2
M120x2
+0.212 / -0
+0.224 / -0
+0.236 / -0
+0.250 / -0
-0.038 / -0.198 (0.16)
-0.038 / -0.208 (0.17)
-0.038 / -0.218 (0.18)
-0.038 / -0.228 (0.19)
Nominal Pitch diameter = Nominal Major diameter
- (minus) PDN
I.e. Nominal Pitch diameter for :
M20 x2 = 20.00 - 1.30 = 18.70
and 1-8UNC = 25.4 - 2.06 = 23.34
ISO METRIC - 60O
Pitch diameter tolerances
Pitch
PDN
Nut (6H)
Bolt (6g)
1
1.25
1.5
1.75
2
2.5
3
3.5
4
4.5
5
5.5
6
0.65
0.81
0.97
1.14
1.30
1.62
1.95
2.27
2.60
2.92
3.25
3.57
3.90
+ 0.15 / - 0
+ 0.16 / - 0
+ 0.18 / - 0
+ 0.20 / - 0
+ 0.21 / - 0
+ 0.22 / - 0
+ 0.26 / - 0
+ 0.28 / - 0
+ 0.30 / - 0
+ 0.31 / - 0
+ 0.33 / - 0
+ 0.35 / - 0
+ 0.37 / - 0
- 0.03 / - 0.14
- 0.03 / - 0.15
- 0.03 / - 0.16
- 0.03 / - 0.18
- 0.04 / - 0.20
- 0.04 / - 0.21
- 0.05 / - 0.25
- 0.05 / - 0.26
- 0.06 / - 0.28
- 0.06 / - 0.30
- 0.07 / - 0.32
- 0.07 / - 0.34
- 0.08 / - 0.36
UN (ISO Inch) - 60O
Pitch diameter tolerances
Pitch
PDN
Nut (2B)
Bolt (2A)
24
20
18
16
14
13
12
11
10
9
8
7
6
5
4½
4
0.69
0.825
0.92
1.03
1.18
1.27
1.37
1.50
1.65
1.83
2.06
2.36
2.75
3.30
3.665
4.125
+ 0.11 / - 0
+ 0.12 / - 0
+ 0.14 / - 0
+ 0.15 / - 0
+ 0.16 / - 0
+ 0.17 / - 0
+ 0.17 / - 0
+ 0.18 / - 0
+ 0.20 / - 0
+ 0.21 / - 0
+ 0.22 / - 0
+ 0.24 / - 0
+ 0.26 / - 0
+ 0.30 / - 0
+ 0.32 / - 0
+ 0.34 / - 0
-0.025 /- 0.11
- 0.03 / - 0.12
- 0.03 / - 0.13
- 0.03 / - 0.15
- 0.04 / - 0.16
- 0.04 / - 0.17
- 0.04 / - 0.17
- 0.04 / - 0.18
- 0.05 / - 0.20
- 0.05 / - 0.21
- 0.05 / - 0.22
- 0.06 / - 0.24
- 0.06 / - 0.26
- 0.07 / - 0.30
- 0.07 / - 0.32
- 0.08 / - 0.34
Living in Europe I normally work with mm but I also have the same tables in inches.
I sometimes find myself needing information too
Thanks,
Gordon
I’d like to start a new forum or “thread”, but how do I go about it? I know this isn't the correct forum or thread, but there doesn't seem to be anything entitled "Start a new thread"
I’m thinking of a title like:
Practical Screw Thread Information & Tolerances
for people to exchange information on all types of screw threads.
Here’s an example of the kind of thing I’d intend putting in it (and I have much more on other thread types):
Important:
These table are made as a guideline for calculating nominal pitch diameter and pitch diameter tolerances. As the primary purpose is to measure with a digital caliper, most dimensions are calculated to the nearest 0.01 mm.
When a tolerance in a table is used, it should be remembered that the tolerance will often be slightly larger for a finer pitch than standard. i.e. the pitch diameter tolerance for M60x2 is larger than for M36x2, which again is larger than that for M16x2 – which is standard.
For exact tolerances use the relevant, approved standard.
Pitch diameter tolerances
Thread
Nut (6H)
M16x2
M36x2
M60x2
M120x2
+0.212 / -0
+0.224 / -0
+0.236 / -0
+0.250 / -0
-0.038 / -0.198 (0.16)
-0.038 / -0.208 (0.17)
-0.038 / -0.218 (0.18)
-0.038 / -0.228 (0.19)
Nominal Pitch diameter = Nominal Major diameter
- (minus) PDN
I.e. Nominal Pitch diameter for :
M20 x2 = 20.00 - 1.30 = 18.70
and 1-8UNC = 25.4 - 2.06 = 23.34
ISO METRIC - 60O
Pitch diameter tolerances
Pitch
PDN
Nut (6H)
Bolt (6g)
1
1.25
1.5
1.75
2
2.5
3
3.5
4
4.5
5
5.5
6
0.65
0.81
0.97
1.14
1.30
1.62
1.95
2.27
2.60
2.92
3.25
3.57
3.90
+ 0.15 / - 0
+ 0.16 / - 0
+ 0.18 / - 0
+ 0.20 / - 0
+ 0.21 / - 0
+ 0.22 / - 0
+ 0.26 / - 0
+ 0.28 / - 0
+ 0.30 / - 0
+ 0.31 / - 0
+ 0.33 / - 0
+ 0.35 / - 0
+ 0.37 / - 0
- 0.03 / - 0.14
- 0.03 / - 0.15
- 0.03 / - 0.16
- 0.03 / - 0.18
- 0.04 / - 0.20
- 0.04 / - 0.21
- 0.05 / - 0.25
- 0.05 / - 0.26
- 0.06 / - 0.28
- 0.06 / - 0.30
- 0.07 / - 0.32
- 0.07 / - 0.34
- 0.08 / - 0.36
UN (ISO Inch) - 60O
Pitch diameter tolerances
Pitch
PDN
Nut (2B)
Bolt (2A)
24
20
18
16
14
13
12
11
10
9
8
7
6
5
4½
4
0.69
0.825
0.92
1.03
1.18
1.27
1.37
1.50
1.65
1.83
2.06
2.36
2.75
3.30
3.665
4.125
+ 0.11 / - 0
+ 0.12 / - 0
+ 0.14 / - 0
+ 0.15 / - 0
+ 0.16 / - 0
+ 0.17 / - 0
+ 0.17 / - 0
+ 0.18 / - 0
+ 0.20 / - 0
+ 0.21 / - 0
+ 0.22 / - 0
+ 0.24 / - 0
+ 0.26 / - 0
+ 0.30 / - 0
+ 0.32 / - 0
+ 0.34 / - 0
-0.025 /- 0.11
- 0.03 / - 0.12
- 0.03 / - 0.13
- 0.03 / - 0.15
- 0.04 / - 0.16
- 0.04 / - 0.17
- 0.04 / - 0.17
- 0.04 / - 0.18
- 0.05 / - 0.20
- 0.05 / - 0.21
- 0.05 / - 0.22
- 0.06 / - 0.24
- 0.06 / - 0.26
- 0.07 / - 0.30
- 0.07 / - 0.32
- 0.08 / - 0.34
Living in Europe I normally work with mm but I also have the same tables in inches.
I sometimes find myself needing information too
Thanks,
Gordon