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System of Measurement
Inch
Metric
Thread Size
2-56
4-40
4-48
6-32
6-40
8-32
8-36
10-24
10-32
1/4"
-20
1/4"
-28
1/4"
-32
5/16"
-18
5/16"
-24
5/16"
-32
3/8"
-16
3/8"
-24
3/8"
-32
Material
Aluminum
Brass
Buna-N
Stainless Steel
Steel
Gender
Female
Male
Hex Length
1/8"
3/16"
1/4"
5/16"
3/8"
7/16"
1/2"
9/16"
5/8"
11/16"
3/4"
7/8"
15/16"
1"
1
1/8"
1
1/4"
1
1/2"
1
3/4"
2"
2
1/4"
2
1/2"
3"
3.2 mm
4.8 mm
6.3 mm
6.35 mm
6.4 mm
9.5 mm
11 mm
12.7 mm
15 mm
18 mm
19.1 mm
25 mm
25.4 mm
37 mm
38 mm
38.1 mm
50 mm
54 mm
Thread Length
1/8"
9/64"
5/32"
11/64"
0.187"
3/16"
13/64"
7/32"
1/4"
17/64"
9/32"
5/16"
21/64"
3/8"
0.437"
7/16"
15/32"
1/2"
Hex Size
3/16"
13/64"
1/4"
5/16"
3/8"
7/16"
1/2"
9/16"
5/8"
11/16"
3/4"
13/16"
7/8"
15/16"
1"
1
1/16"
1
1/8"
1
1/4"
1
3/8"
1
5/8"
4.5 mm
6 mm
6.4 mm
7.9 mm
8 mm
9.5 mm
10 mm
11 mm
12.7 mm
13 mm
14 mm
16 mm
17 mm
17.4 mm
18 mm
19 mm
21 mm
22 mm
Pitch
0.35 mm
0.4 mm
0.45 mm
0.5 mm
0.6 mm
0.7 mm
0.75 mm
0.8 mm
1 mm
1.25 mm
1.5 mm
1.75 mm
2 mm
For Adapting
Gender
Thread Direction
Thread Size
Thread Type
Shape
Hex
Round
Thread Fit
Metric Class 6g
Metric Class 6H
Unified Standard Class 2A
Unified Standard Class 2B
Unified Standard Class 3A
Length
1/8"
1/4"
1"
1
1/4"
1
1/2"
1
3/4"
2"
2
1/2"
2
3/4"
3"
3
1/8"
3
1/4"
3
1/2"
3
3/4"
4"
4
1/4"
4
1/2"
4
3/4"
5"
5
1/2"
5
7/8"
6"
7"
7
7/8"
8"
Tensile Strength
45,000 psi
70,000 psi
73,000 psi
75,000 psi
78,000 psi
85,000 psi
150,000 psi
Not Rated
Drive Style
External Hex
Hex
Slotted
DFARS Specialty Metals
Compliant
Exempt
Not Compliant
RoHS
Compliant
Compliant with Exemptions
Not Compliant
Hardness
Rockwell B55
Rockwell B56
Rockwell B65
Rockwell B67
Rockwell B70
Rockwell B80
Rockwell B83
Rockwell B85
Rockwell C39
Not Rated
U.S.–Mexico–Canada Agreement (USMCA) Qualifying
Yes
No
REACH
Compliant
Not Compliant
Export Control Classification Number (ECCN)
2B999
EAR99
Specifications Met
ASTM A108
ASTM A276
ASTM A582
ASTM B211
ASTM B633
Finish
Black Oxide
Passivated
Zinc Plated
Zinc Yellow-Chromate Plated
Thread Type
BSPP
BSPT
Metric
NPT
NPTF
UNC
UNF
Universal
Pipe Size
1/8
1/4
3/8
1/2
3/4
OD
27/32"
1
1/4"
1
1/2"
1
3/4"
2"
Thread Spacing
Coarse
Fine
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3,541 Products
Thread Adapters
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Finger tighten two female-threaded parts with dissimilar inch thread sizes
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Finger tighten two female-threaded parts with dissimilar metric thread sizes
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Join two female-threaded parts with dissimilar metric thread sizes
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Join inch and metric female-threaded parts
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Air, liquids, wire, and other thin materials flow through the hole
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Finger tighten two female-threaded parts with inch and metric thread sizes
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Male-Female Thread Adapters
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Change thread size and spacing
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Increase or decrease metric thread size and change the pitch
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Air, liquids, wire, and other thin materials flow through the hole
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Female Thread Adapters
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Join two male-threaded parts with dissimilar inch thread sizes
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Metric-to-Metric Female Hex Thread Adapters
Join two male-threaded parts with dissimilar metric thread sizes
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Inch-to-Metric Female Hex Thread Adapters
Join two male-threaded parts with inch and metric thread sizes
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