MIL-DTL-1222J
TABLE V.
Coating thicknesses on externally-threaded fasteners with thread
class 2A.
Minimum thickness (inches)
Maximum thickness (inches)
Diameter
1
2
3
4
8UN Thread
UNC Thread
8UN Thread
UNC Thread
¼
0.000183
---
0.000275
---
5
/6
0.000200
---
0.000300
---
1
3
/
0.000217
---
0.000325
---
8
7
/6
0.000233
---
0.000350
---
1
½
0.000250
---
0.000375
---
9
/
0.000267
---
0.000400
---
16
5
/
0.000267
---
0.000400
---
8
¾
0.000300
---
0.000450
---
7
/
0.000317
---
0.000475
---
8
1
0.000333
0.000333
0.000500
0.000500
1
1/
0.000367
0.000350
0.000550
0.000525
8
1¼
0.000367
0.000350
0.000550
0.000525
3
1/
0.000400
0.000367
0.000600
0.000550
8
1½
0.000400
0.000367
0.000600
0.000550
1¾
0.000450
0.000383
0.000675
0.000575
2
0.000483
0.000383
0.000725
0.000575
2¼
0.000483
0.000400
0.000725
0.000600
2½
0.000517
0.000400
0.000775
0.000600
2¾
0.000533
0.000417
0.000800
0.000625
3
0.000533
0.000433
0.000800
0.000650
3¼
0.000550
0.000433
0.000825
0.000650
3½
0.000550
0.000433
0.000825
0.000650
3¾
0.000567
0.000450
0.000850
0.000675
7
3/
0.000567
0.000450
0.000850
0.000675
8
4
0.000567
0.000450
0.000850
0.000675
Notes:
1
One sixth of the thread allowance in table 20 of ASME B1.1.
2
One sixth of the thread allowance in table 25 of ASME B1.1.
3
One fourth of the thread allowance in table 20 of ASME B1.1.
4
One fourth of the thread allowance in table 25 of ASME B1.1.
36
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