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Specifications and Sizes

American Thread

Size

Decimal

Equivant

Threads

Per Inch

Allen Screw

Coarse & Fine Key Size Head O.D.

Maximum

Button Heads

Key Size Head O.D.

Maximum

Flat Heads

Key Size Head O.D.

Maximum

#4

#5

#6

#8

#10 (3/16)

1/4

5/16

3/8

7/16

1/2

5/8

3/4

40

40

32

32

24

20

18

16

14

13

11

10

40

44

40

36

32

28

24

24

20

20

18

16

0/02

3/32

7/64

9/64

5/32

3/16

1/4

5/16

3/8

3/8

1/2

5/8

.100

.205

.226

.270

.312

.375

.469

.562

.656

.750

.938

1.125

1/16

5/64

5/64

3/32

1/8

5/32

3/16

7/32

---

5/16

3/8

---

.212

.238

.262

.312

.361

.437

.547

.656

---

.875

1.00

---

1/16

5/64

5/64

3/32

1/8

5/32

3/16

7/32

1/4

5/16

3/8

---

.255

.281

.307

.359

.411

.531

.656

.781

.844

.938

1.188

---

.112

.125

.138

.164

.190

.250

.3125

.375

.4375

.500

.625

.750

Flat Washer Specifications

Size

Flat Washers

O.D.

I.D.

#6

#8

#10

#12

1/4

5/16

3/8

7/16

1/2

9/16

5/8

3/4

3/8

7/16

1/2

9/16

5/8

11/16

13/16

59/64

1-1/16

1-3/16

1-5/16

1-1/2

5/32

3/16

7/32

1/4

9/32

11/32

13/32

15/32

17/32

19/32

21/32

13/16

Thickness

3/64

3/64

3/64

1/16

1/16

1/16

1/16

1/16

3/32

3/32

3/32

9/64

AN Washers

O.D.

I.D.

---

---

.437

---

.500

.562

.625

.750

.875

1.062

1.187

---

---

---

.203

---

.265

.328

.390

.453

.516

.578

.641

---

Thickness

---

---

1/32

---

1/16

1/16

1/16

1/16

1/16

1/16

1/16

---

GW Washers

O.D.

I.D.

---

---

---

---

5/8

11/16

13/16

59/64

1-1/16

---

1-5/16

---

---

---

---

---

.260

.323

.385

.448

.510

---

.635

---

Thickness

---

---

---

---

.08

.09

.09

.10

.11

---

.12

---

Metric Flat Washer Specifications

Size

Flat Washers

O.D.

I.D.

9

10

12

14

16

20

24

28

30

34

4.3

5.3

6.4

7.4

8.4

10.5

13

15

17

19

Thickness

0.8

1

11.6

1.6

1.6

2

2.5

2.5

3

3

4mm

5mm

6mm

7mm

8mm

10mm

12mm

14mm

16mm

18mm

Metric Thread

Size

Threads

Per Inch

Allen Screw

Coarse & Fine

Key Size Head O.D.

Maximum

Button Heads

Key Size

Head O.D.

Maximum

Flat Heads

Key Size

Head O.D.

Maximum

3mm

4mm

5mm

6mm

8mm

10mm

12mm

0.5

0.7

0.8

1.0

1.25

1.50

1.75

---

---

---

---

1.00

1.25

1.50

2.5mm

3mm

4mm

5mm

6mm

8mm

10mm

5.5mm

7.0mm

8.5mm

10.00mm

13.00mm

16.00mm

18.00mm

2mm

2.5mm

3mm

4mm

5mm

6mm

8mm

5.70mm

7.60mm

9.50mm

10.50mm

14.00mm

17.50mm

21.00mm

2mm

2.5mm

3mm

4mm

5mm

6mm

8mm

6.40mm

8.60mm

10.60mm

12.60mm

16.80mm

21.00mm

25.00mm

American Wrench Sizes

(Width across flats) - Hex Bolts

Bolt Diameter

Wrench Size

7/16

1/2

9/16

5/8

3/4

13/16

15/16

1 1/8

1/4

5/16

3/8

7/16

1/2

9/16

5/8

3/4

Metric Wrench Sizes

(Width across flats) - Hex Bolts

Bolt Diameter

Wrench Size

5.5mm

7mm

8mm

10mm

11mm

13mm

17mm

19mm

3mm

4mm

5mm

6mm

7mm

8mm

10mm

12mm

LBS.

Material

Stainless Steel

Grade 2

Grade 5

Grade 8

85,000

85,000

120,000

150,000

Tensil Strenths of

Material Requirements

Bit Size

Torx Size

6/32

8/32

10/24

10/32

1/4

5/16

3/8

1/2

5/8

T-10

T-15

T-25

T-25

T-27

T-40

T-45

T-55

T-60

Torx Size and Bit Sizes

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