Page 15 of Fastener Tools by Cooper Power Tools
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16
Socket Head Sizing Chart
Nominal
Socket Head Cap Screws
Flat Head
Button
Hex Size,
1960
1936
Cap
Head
Set
Shoulder
Pressure
Low Head
Inches
Series
Series
Screws
Cap Screws
Screws
Screws
Plugs
Allenuts
Cap Screws
.050
0
0, 1
1, 2
3, 4
4
.050
1/16
1
2
3, 4
3, 4
5, 6
5, 6
5/64
2, 3
3, 4
5, 6
5, 6
8
8
3/32
4, 5
5, 6
8
8
10
10
7/64
6
1/8
8
10
10
1/4
1/4
4, 5
1/4
9/64
8
10
5/32
10
1/4
1/4
1/4
5/16
5/16
1/16
6
5/16
3/16
1/4
5/16
5/16
3/8
3/8
1/8
8, 10
3/8
7/32
5/16
3/8
3/8
7/16
7/16
1/4
5/16
7/16
1/2
1/2
1/4
1/4
1/2
5/16
3/8
3/8, 7/16
1/2
5/8
5/8
3/8
5/16
5/8
3/8
7/16, 1/2
1/2
5/8
3/4
3/4
1/2
3/8
7/16
7/16
1/2
5/8
5/8
3/4
7/8
1
1/2
9/16
3/4, 7/8
7/8
1, 1 1/8
3/4
5/8
3/4
1
1
1 1/4, 1 3/8
1 1/4
1
5/8
3/4
7/8, 1
1 1/8, 1 1/4, 1 3/8
1 1/8
1 1/2
1 1/4
3/4
7/8
1 1/8, 1 1/4
1 1/4, 1 3/8
1 1/2
7/8
1
1 3/8, 1 1/2
1 1/2
1 1/2
1 3/4, 2
1 3/4
1 1/2, 2
1
1 1/4
1 3/4
2
1 1/4
1 1/2
2
1 1/2
1 3/4
2 1/4, 2 1/2
1 3/4
2
2 3/4
Nominal
hex Size,
Socket Head
Flat Head
Button Head
Set
Shoulder
Low Head
MM
Cap Screws
Cap Screws
Cap Screws
Screws
Screws
Allenuts
Cap Screws
1.5
M1.6, M1.7, M2
M3
2
M2.3, M2.5, M2.6
M3
M3
M4
2.5
M3
M4
M4
M5
3
M4
M5
M5
M6
6mm
M3
M4
4
M5
M6
M6
M8
8mm
M4
M5
5
M6
M8
M8
M10
10mm
M5
M6
6
M8
M10
M10
M12, M14
12mm
M6
M8
8
M10
M12
M12
M16
16mm
M8
M10
10
M12
M14, M16
M20
20mm
M10
M12
12
M14
M20
M24
M12
M14
14
M16
M16
17
M20
M16
M20, M22
19
M24
M24
SAE
Metric
Socket Head Bits
Part
Hex
Overall Length
Number
Size
In.
mm
185-000X
.050
1
25
185-00X
1/16
1
25
185-0X
5/64
1
25
185-1X
3/32
1
25
185-9X
7/64
1
25
185-2X
1/8
1
25
185-10X
9/64
1
25
185-3X
5/32
1 5/16
33
185-4X
3/16
1 5/16
33
185-4-4X
3/16
4
102
185-5X
7/32
1 5/16
33
185-6X
1/4
1 5/16
33
185-7X
5/16
1 1/4
32
185-8X
3/8
1 1/4
32
1/4 Hex Insert Bits
1/4 Hex Insert Bits Metric
Part
Hex
Overall Length
Number
Size
In.
mm
315-3X
5/32
1 5/16
33
315-4X
3/16
1 5/16
33
315-5X
7/32
1 5/16
33
315-6X
1/4
1 5/16
33
315-7X
5/16
1 5/16
33
315-8X
3/8
1 5/16
33
5/16 Hex Insert Bits
Part
Hex
Overall Length
Number
Size
In.
mm
185-1.5mm
1.5mm
1
25
185-2mm
2mm
1
25
185-2.5mm
2.5mm
1
25
185-3mm
3mm
1
25
185-4mm
4mm
1 5/16
33
185-5mm
5mm
1 5/16
33
185-6mm
6mm
1 5/16
33
185-7mm
7mm
1 1/4
32
185-8mm
8mm
1 1/4
32
185-9mm
9mm
1 1/4
32
185-10mm
10mm
1 1/4
32
Part
Hex
Overall Length
Number
Size
In.
mm
AM-02
1/16
1 15/16
49
AM-02-A
5/64
1 15/16
49
AM-03
3/32
1 15/16
49
AM-03-3
3/32
3
76
AM-03-6
3/32
6
152
AM-03-A
7/64
1 15/16
49
AM-04
1/8
1 15/16
49
AM-04-3
1/8
3
76
AM-04-35
1/8
3 1/2
89
AM-04-4
1/8
4
102
AM-04-5
1/8
5
127
AM-04-6
1/8
6
152
AM-04-A
9/64
1 15/16
49
AM-04-A-4
9/64
4
102
AM-05
5/32
1 15/16
49
AM-05-3
5/32
3
76
AM-05-35
5/32
3 1/2
89
AM-05-4
5/32
4
102
AM-05-5
5/32
3
127
AM-05-6
5/32
6
152
AM-05-8
5/32
8
203
AM-06
3/16
1 15/16
49
AM-06-3
3/16
3
76
AM-06-4
3/16
4
102
AM-06-6
3/16
6
152
AM-07
7/32
1 15/16
49
AM-08
1/4
1 15/16
49
AM-10
5/16
1 15/16
49
1/4 Hex
Power Drive
Part
Hex
Overall Length
Number
Size
In.
mm
315-2.5mm
2.5mm
1
25
315-4mm
4mm
1 5/16
33
315-5mm
5mm
1 5/16
33
315-6mm
6mm
1 5/16
33
315-7mm
7mm
1 5/16
33
315-8mm
8mm
1 5/16
33
315-10mm
10mm
1 3/8
35
315-12mm
12mm
1 1/4
32
315-14mm
14mm
1 1/4
32
5/16 Hex Insert Bits-Metric
1/4 Hex Power
Drive Metric
Part
Hex
Overall Length
Number
Size
In.
mm
AS-06
3/16
3
76
AS-10
5/16
3
76
AS-12
3/8
3
76
5/16 Hex
Power Drive
Part
Hex
Overall Length
Number
Size
In.
mm
AM-1.5mm
1.5mm
1 15/16
49
AM-2mm
2mm
1 15/16
49
AM-2.5mm
2.5mm
1 15/16
49
AM-3mm
3mm
1 15/16
49
AM-3mm-3
3mm
3
76
AM-3mm-4
3mm
4
102
AM-4mm
4mm
1 15/16
49
AM-5mm
5mm
1 15/16
49
AM-5mm-4
5mm
4
102
AM-6mm
6mm
1 15/16
49
AM-6mm-4
6mm
4
102
AM-7mm
7mm
1 15/16
49
AM-8mm
8mm
1 15/16
49
AM-10mm
10mm
1 15/16
49
BOLDED part numbers are industry popular items and are followed by common variations which may vary in price and availability.
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