Thumb & Wing Screws

External Threads – Class 2A

Click here to Request a quote.

Nominal Size &Threads/lnch & Series Designation Allowance Major Diameter Pitch Diameter
Max Min Max Min Tolerance
0-80
1-64
1-72
2-56
2-64
UNF
UNC
UNF
UNG
UNF
0.0005
0.0006
0.0006
0.0006
0.0006
0.0595
0.0724
0.0724
0.0854
0.0854
0.0563
0.0686
0.0689
0.0813
0.0816
0.0514
0.0623
0.0634
0.0738
0.0753
0.0496
0.0603
0.0615
0.0717
0.0733
0.0018
0.0020
0.0019

0.0021
0.0020
3-48
3-56
4-40
4-48
5-40
UNG
UNF
UNG
UNF
UNC
0.0007
0.0007
0.0008
0.0007
0.0008
0.0938
0.0983
0.1112
0.1113
0.1242
0.0938
0.0942
0.1061
0.1068
0.1191
0.0848
0.0867
0.0950
0.0978
0.1080
0.0825
0.0845
0.0925
0.0954
0.1054
0.0023
0.0022
0.0025
0.0024
0.0026
5-44
6-32
6-40
8-32
8-36
UNF
UNG
UNF
UNG
UNF
0.0007
0.0008
0.0008
0.0009
0.0008
0.1243
0.1372
0.1372
0.1631
0.1632
0.1195
0.1312
0.1321
0.1571
0.1577
0.1095
0.1169
0.1210
0.1428
0.1452
0.1070
0.1141
0.1184
0.1399
0.1424
0.0025
0.0028
0.0026
0.0029
0.0028
10-24
10-32
12-24
12-28
1/4-20
UNG
UNF
UNG
UNF
UNG
0.0010
0.0009
0.0010
0.0010
0.0011
0.1890
0.1891
0.2150
0.2150
0.2489
0.1818
0.1831
0.2078
0.2085
0.2408
0.1619
0.1688
0.1879
0.1918
0.2164
0.1586
0.1658
0.1845
0.1886
0.2127
0.0033
0.0030
0.0034
0.0032
0.0037
1/4-28
5/16-18
5/16-24
3/8-16
3/8-24
UNF
UNG
UNF
UNG
UNF
0.0010
0.0012
0.0011
0.0013
0.0011
0.2490
0.3113
0.3114
0.3737
0.3739
0.2425
0.3026
0.3042
0.3643
0.3667
0.2258
0.2752
0.2843
0.3331
0.3468
0.2225
0.2712
0.2806
0.3287
0.3430
0.0033
0.0040
0.0037
0.0044
0.0038
7/16-14
7/16-20
1/2-13
1/2-20
9/16-12
UNG
UNF
UNG
UNF
UNG
0.0014
0.0013
0.0015
0.0013
0.0016
0.4361
0.4362
0.4985
0.4987
0.5609
0.4258
0.4281
0.4876
0.4906
0.5495
0.3897
0.4037
0.4485
0.4662
0.5068
0.3850
0.3995
0.4435
0.4619
0.5016
0.0047
0.0042
0.0050
0.0043
0.0052
9/16-18
5/8-11
5/8-18
3/4-10
3/4-16
UNF
UNG
UNF
UNG
UNF
0.0014
0.0016
0.0014
0.0018
0.0015
0.5611
0.6234
0.6236
0.7482
0.7485
0.5524
0.6113
0.6149
0.7353
0.7391
0.5250
0.5644
0.5875
0.6832
0.7079
0.5205
0.5589
0.5828
0.6773
0.7029
0.0045
0.0055
0.0047
0.0059
0.0050
7/8-9
7/8-14
1-8
1-12
1-14
UNG
UNF
UNG
UNF
UNS
0.0019
0.0016
0.0020
0.0018
0.0017
0.8731
0.0834
0.9980
0.9982
0.9983
0.8592
0.8631
0.9830
0.9868
0.9880
0.8009
0.8270
0.9168
0.9441
0.9519
0.7946
0.8216
0.9100
0.9382
0.9463
0.0063
0.0054
0.0068
0.0059
0.0056
11/8-7
11/8-8
11/8-12
11/4-7
1114-8
UNG
UN
UNF
UNG
UN
0.0022
0.0021
0.0018
0.022
0.0021
1.1228
1.1229
1.1232
1.2478
1.2479
1.1064
1.1079
1.1118
1.2314
1.2329
1.0300
1.0417
1.0691
1.1550
1.1667
1.0228
1.0348
1.0631
1.1476
1.1597
0.0072
0.0069
0.0060
0.0074
0.0070
11/4-12
1 3/8-6
1 3/8-8
1 3/8-12
11/2-6
UNF
UNC
UN
UNF
UNC
0.0018
0.0024
0.0022
0.0019
0.0024
1.2482
1.3726
1.3728
1.3731
1.4976
1.2368
1.3544
1.3578
1.3617
1.4794
1.1941
1.2643
1.2916
1.3190
1.3893
1.1879
1.2563
1.2844
1.3127
1.3812
0.0062
0.0080
0.0072
0.0063
0.0081
1 1/2-8
1 1/2-12
1 5/8-8
1 3/4-5
1 3/4-8
UN
UNC
UN
UNC
UN
0.0022
0.0019
0.0022
0.0027
0.0023
1.4978
1.4981
1.6228
1.7473
1.7477
1.4828
1.4867
1.6087
1.7268
1.7327
1.4166
1.4440
1.5416
1.6174
1.6665
1.4093
1.4376
1.5342
1.6085
1.6590
0.0073
0.0064
0.0074
0.0089
0.0075
1 7/8-8
2-4 1/2
2-8
2 1/4-4.5
2 1/4-8
UN
UNC
UN
UNC
UN
0.0023
0.0029
0.0023
0.0029
0.0024
1.8727
1.9971
1.9977
2.2471
2.2476
1.8577
1.9751
1.9827
2.2251
2.2326
1.7915
1.8528
1.9165
2.1028
2.1664
1.7838
1.8433
1.9087
2.0931
2.1584
0.0077
0.0095
0.0078
0.0097
0.0080
2 1/2-4
2 1/2-8
2 3/4-4
2 3/4-8
3-4
UNC
UN
UNC
UN
UNC
0.0031
0.0024
0.0032
0.0025
0.0032
2.4969
2.4976
2.7468
2.7475
2.9968
2.4731
2.4826
2.7230
2.7325
2.9730
2.3345
2.4164
2.5844
2.6663
2.8344
2.3241
2.4082
2.5739
2.6580
2.8237
0.0104
0.0082
0.0105
0.0083
0.0107
3-8
3 1/4-4
3 1/4-8
3 1/2-4
3 1/2-8
UN
UNC
UN
UNC
UN
0.0026
0.0033
0.0026
0.0033
0.0026
2.9974
3.2467
3.2474
3.4967
3.4974
2.9824
3.2229
3.2324
3.4729
3.4824
2.9162
3.0843
3.1662
3.3343
3.4162
2.9077
3.0734
3.1575
3.3233
3.4074
0.0085
0.0109
0.0087
0.0110
0.0088
3 3/4-4
3 3/4-8
4-4
4-8
UNC
UN
UNC
UN
0.0034
0.0027
0.0034
0.0027
3.7466
3.7473
3.9966
3.9973
3.7228
3.7323
3.9728
3.9823
3.5842
3.6661
3.8342
3.9161
3.5730
3.6571
3.8229
3.9070
0.0112
0.0090
0.0113
0.0091

 

Thumb Screws

Type P Thumb Screw Type P Type S Type S Thumb Screw

Type P

Click here to Request a quote.

Nominal Size or
Basic Screw Diameter
Threads
per Inch
A B C C1 L
Head
Width
Head
Height
Head
Thickness
Head
Thickness
Practical Screw
Lengths
Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.
8 0.164
10 0.190
1/4 0.250
5/16 0.312
32
24
20
18
0.51
0.89
1.05
1.21
0.49
0.83
0.99
1.15
0.32
0.78
0.94
1.00
0.30
0.66
0.81
0.88
0.09
0.18
0.24
0.27
0.07
0.16
0.22
0.25
0.04
0.08
0.10
0.11
0.02
0.06
0.08
0.09
1.00
2.00
3.00
4.00
0.38
0.50
0.50
0.50

Type S

Click here to Request a quote.

Nominal Size or
Basic Screw Diameter
Threads
per Inch
A B C E L
Head
Width
Head
Height
Head
Thickness
Shoulder
Diameter
Practical Screw
Lengths
Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.
1/4 0.250
20 0.55 0.52 0.64 0.61 0.07 0.05 0.47 0.44 1.50 0.50

Due to the variation in head dimensions from different manufacturers, thumb screws may not always conform
to the listed (I.F.I.) specifications.

 

 

Wing
Screws
Wing Screw Wing Screws

Click here to Request a quote.

Basic
Screw
Dia.
Thrd per Inch S H W d D G T L
Wing Spread Wing Hght Wing Thick. Shank
Dia.
Shank Dia. Hght Stock Thick. Practical Screw Lngth
Max Min. Max Min. Max Min. Max Min. Max Min. Max Min. Max Min. Max Min.
8
10
1/4
5/16
32
24
20
18
0.78
0.90
1.09
1.31
0.72
0.84
1.03
1.25
0.40
0.46
0.46
0.62
0.34
0.40
0.40
0.56
0.18
0.21
0.26
0.29
0.12
0.15
0.20
0.23
0.35
0.35
0.47
0.57
0.31
0.31
0.43
0.53
0.40
0.53
0.61
0.68
0.34
0.47
0.55
0.62
0.21
0.22
0.24
0.29
0.14
0.16
0.18
0.23
0.04
0.04
0.04
0.07
0.03
0.03
0.03
0.05
0.75
1.00
1.50
1.50
0.38
0.38
0.50
0.50