HOME INTRO PRODUCTS CONTACT
 
Fasteners
Building Material
Furniture Hardware
Rigging Hardware
Wires and Nails
Auto Parts
Castings
Metal Stampings
Promotion
Thumb & Wing Screws
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

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

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.
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
青岛奥塔克贸易有限公司版权所有　　　 [management] Statistic：