UNIFIED SCREW THREADS FINE SERIES, UNF, BASIC SIZES

Note: The information contained here is for referance only of common standards and and may not accurately reflect actual product dimensions.

Please check the product details or ask if any dimension is critical

Designation

Pitch In.

Major
Diameter In.

Effective
Diameter In.

Minor Diameter In.

Nut

Bolt

1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
1 1/8
1 1/4
1 3/8
1 1/2

-28 UNF
-24 UNF
-24 UNF
-20 UNF
-20 UNF
-18 UNF
-18 UNF
-16 UNF
-14 UNF
-12 UNF
-12 UNF
-12 UNF
-12 UNF
-12 UNF

0.03571
0.04167
0.04167
0.05000
0.05000
0.05556
0.05556
0.06250
0.07143
0.08333
0.08333
0.08333
0.08333
0.08333

0.2500
0.3125
0.3750
0.4375
0.5000
0.5625
0.6250
0.7500
0.8750
1.0000
1.1250
1.2500
1.3750
1.5000

0.2268
0.2854
0.3479
0.4050
0.4675
0.5264
0.5889
0.7094
0.8286
0.9459
1.0709
1.1959
1.3209
1.4459

0.2113
0.2674
0.3299
0.3834
0.4459
0.5024
0.5649
0.6823
0.7977
0.9098
1.0348
1.1598
1.2848
1.4098

0.2062
0.2614
0.3239
0.3762
0.4387
0.4943
0.5568
0.6733
0.7874
0.8978
1.0228
1.1478
1.2728
1.3978