Hand Reamers 

　　 Solid hand reamers should be used when a greater accuracy in hole size is required. The cutting action of a hand reamer is performed on the taper (approximately 0.015 per inch) which extends 3/8-to 1/2-inch above the chamfer. This slight taper limits the stock allowance, or metal to be removed by the reamer, from 0.001- to 0.003-inch depending on the size of the reamer. The chamfer aids in aligning and starting the tool, and reamers usually have straight shanks and a square end to fit into an adjustable tap and reamer wrench. A hand reamer should never be chucked into a machine spindle for power reaming. A center may be installed in the Drilling machine spindle to align and center the hand reamer. As the reamer is turned by hand into the hole, only a slight pressure is applied to the hand feed lever to keep the center in contact with the reamer and maintain accuracy in alignment.

Hand Reamers Straight Flute

RIGHT HAND CUT, FRACTIONAL SIZE

straight flute hand reamers

Fractional Size (in.)

Decimal Equiv. (in.)

Length Overall (in.)

Length Of Flute (in.)

1/8

.1250

3

1-1/2

9/64

.1406

3-1/4

1-5/8

5/32

.1562

3-1/4

1-5/8

11/64

.1719

3-1/2

1-3/4

3/16

.1875

3-1/2

1-3/4

13/64

.2031

3-3/4

1-7/8

7/32

.2188

3-3/4

1-7/8

15/64

.2344

4

2

1/4

.2500

4

2

17/64

.2656

4-1/4

2-1/8

9/32

.2812

4-1/4

2-1/8

19/64

.2969

4-1/2

2-1/4

5/16

.3125

4-1/2

2-1/4

21/64

.3281

4-3/4

2-3/8

11/32

.3438

4-3/4

2-3/8

23/64

.3594

5

2-1/2

3/8

.3750

5

2-1/2

25/64

.3906

5-1/4

2-5/8

13/32

.4062

5-1/4

2-5/8

27/64

.4219

5-1/2

2-3/4

7/16

.4375

5-1/2

2-3/4

29/64

.4531

5-3/4

2-7/8

15/32

.4688

5-3/4

2-7/8

31/64

.4844

6

3

1/2

.5000

6

3

17/32

.5312

6-1/4

3-1/8

9/16

.5625

6-1/2

3-1/4

19/32

.5938

6-3/4

3-3/8

5/8

.6250

7

3-1/2

21/32

.6562

7-3/8

3-11/16

11/16

.6875

7-3/4

3-7/8

23/32

.7188

8-1/8

4-1/16

3/4

.7500

8-3/8

4-3/16

25/32

.7812

8-3/4

4-3/8

13/16

.8125

9-1/8

4-9/16

27/32

.8438

9-3/8

4-11/16

7/8

.8750

9-3/4

4-7/8

29/32

.9062

10

5

15/16

.9375

10-1/4

5-1/8

31/32

.9688

10-5/8

5-5/16

1

1.0000

10-7/8

5-7/16

1-1/16

1.0625

11-1/4

5-5/8

1-1/8

1.1250

11-5/8

5-13/16

1-3/16

1.1875

12

6

1-1/4

1.2500

12-1/4

6-1/8

1-5/16

1.3125

12-1/2

6-1/4

1-3/8

1.3750

12-5/8

6-5/16

1-7/16

1.4375

12-7/8

6-7/16

1-1/2

1.5000

13

6-1/2