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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.
RIGHT HAND CUT, FRACTIONAL SIZE
RIGHT HAND CUT, FRACTIONAL SIZE
| 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 |