Allmetal Screw Products corp

NY(631)243-5200 - MD(410)437-0088 - OH(440)461-4755 - GA(912)526-6794

Unified Screw Threads: Basic Demensions

Fine Thread Series UNF & NF

Size
Major Diameter
Threads
Pitch Diameter
Minor Diameter External
Minor Diameter Internal
Lead Angle At Pitch Diameter
Section At Minor Diameter
Inch
Per Inch
Inch
Inch
Inch
Deg
Min
Sq Inch
0
0.0600
80
0.0519
0.0447
0.0465
4
23
0.00151
1
0.0730
72
0.0640
0.0560
0.0580
3
57
0.00237
2
0.0860
64
0.0759
0.0668
0.0691
3
45
0.00339
3
0.0990
56
0.0874
0.0771
0.0797
3
43
0.00451
4
0.1120
48
0.0985
0.0864
0.0894
3
51
0.00566
5
0.1250
44
0.1102
0.0971
0.1004
3
45
0.00716
6
0.1380
40
0.1218
0.1073
0.1109
3
44
0.00874
8
0.1640
36
0.1460
0.1299
0.1339
3
28
0.01285
10
0.1900
32
0.1697
0.1517
0.1562
3
21
0.0175
12
0.2160
28
0.1928
0.1722
0.1773
3
22
0.0226
1/4
0.2500
28
0.2268
0.2062
0.2113
2
52
0.0326
5/16
0.3125
24
0.2854
0.2614
0.2674
2
40
0.0524
3/8
0.3750
24
0.3479
0.3239
0.3299
2
11
0.0809
7/16
0.4375
20
0.4050
0.3762
0.3834
2
15
0.1090
1/2
0.5000
20
0.4675
0.4387
0.4459
1
57
0.1486
9/16
0.5625
18
0.5264
0.4943
0.5024
1
55
0.189
5/8
0.6250
18
0.5889
0.5568
0.5649
1
43
0.240
3/4
0.7500
16
0.7094
0.6733
0.6823
1
36
0.351
7/8
0.8750
14
0.8286
0.7874
0.7977
1
34
0.480
1
1.0000
12
0.9459
0.8978
0.9098
1
36
0.625
1 1/8
1.1250
12
1.0709
1.0228
1.0348
1
25
0.812
1 1/4
1.2500
12
1.1959
1.1478
1.1598
1
16
1.024
1 3/8
1.3750
12
1.3209
1.2728
1.2848
1
9
1.260
1 1/2
1.5000
12
1.4459
1.3978
1.4098
1
3
1.521

Click the "BACK BUTTON" to return to the Unified Screw Threads Menu

 Main Menu ..... Buying Guide

Copyright (c) 1997 Thru 2008 .. Last Changed 11/07/08
Contact