Machinery's Handbook, 31st Edition
Reamers 921 American National Standard Expansion Hand Reamers—Straight and Helical Flutes, Squared Shank ANSI/ASME B94.2-1995 (R2015)
D
B
C
A
D
B
C
A
Length Overall A
Flute Length B
Length of Square C
Size of Square
Number of Flutes
Shank Dia. D
Reamer Dia.
Max.
Min.
Max.
Min. Straight Flutes
0.185 0.235 0.280 0.330 0.375 0.420 0.470 0.515 0.560 0.655 0.750 0.845 0.935 0.185 0.235 0.280 0.330 0.375 0.470 0.560 0.655 0.750 0.935
6 to 8 6 to 8 6 to 9 6 to 9 6 to 9 6 to 9 6 to 9 6 to 10 6 to 10 8 to 10 8 to 10 8 to 12 8 to 12 6 to 8 6 to 8 6 to 9 6 to 9 6 to 9 6 to 9 6 to 10 6 to 10 6 to 10
4 3 ⁄ 8 4 3 ⁄ 8 5 3 ⁄ 8 5 3 ⁄ 8 6 1 ⁄ 2 6 1 ⁄ 2
3 3 ⁄ 4
1 3 ⁄ 4 1 7 ⁄ 8
1 1 ⁄ 2 1 1 ⁄ 2 1 3 ⁄ 4 1 3 ⁄ 4 1 3 ⁄ 4 1 7 ⁄ 8 2 1 ⁄ 4 2 1 ⁄ 2 2 5 ⁄ 8 3 1 ⁄ 8 3 1 ⁄ 8 3 1 ⁄ 2 4 1 ⁄ 4 1 1 ⁄ 2 1 1 ⁄ 2 1 3 ⁄ 4 1 3 ⁄ 4 1 3 ⁄ 4 2 1 ⁄ 4 2 5 ⁄ 8 3 1 ⁄ 8 3 1 ⁄ 8
1 ⁄ 4
1 ⁄ 4
1 ⁄ 4
4
5 ⁄ 16
5 ⁄ 16
5 ⁄ 16
2 2
4 1 ⁄ 4 4 1 ⁄ 2 5 3 ⁄ 8 5 3 ⁄ 4 6 1 ⁄ 4 6 1 ⁄ 2 5 7 1 ⁄ 2 8 3 ⁄ 8
3 ⁄ 8
3 ⁄ 8
3 ⁄ 8
7 ⁄ 16
7 ⁄ 16
7 ⁄ 16
2 1 ⁄ 2 2 1 ⁄ 2
1 ⁄ 2
1 ⁄ 2
1 ⁄ 2
9 ⁄ 16
9 ⁄ 16
9 ⁄ 16
7
3 3
5 ⁄ 8
5 ⁄ 8
5 ⁄ 8
7 5 ⁄ 8
11 ⁄ 16
11 ⁄ 16
11 ⁄ 16
8 9
3 1 ⁄ 2
3 ⁄ 4 7 ⁄ 8
3 ⁄ 4 7 ⁄ 8
3 ⁄ 4 7 ⁄ 8
4
1
10
1 1 1
1
4 1 ⁄ 2 4 3 ⁄ 4
9
10 1 ⁄ 2
1 1 ⁄ 8 1 1 ⁄ 4
1 1 ⁄ 8 1 1 ⁄ 4
11
5
9 3 ⁄ 4
Helical Flutes
4 3 ⁄ 8 4 3 ⁄ 8 6 1 ⁄ 8 6 1 ⁄ 4 6 1 ⁄ 2 8 5 ⁄ 8 9 3 ⁄ 8 8
3 7 ⁄ 8
1 3 ⁄ 4 1 3 ⁄ 4
1 ⁄ 4
1 ⁄ 4
1 ⁄ 4
4
5 ⁄ 16
5 ⁄ 16
5 ⁄ 16
2 2
4 1 ⁄ 4 4 1 ⁄ 2
3 ⁄ 8
3 ⁄ 8
3 ⁄ 8
7 ⁄ 16
7 ⁄ 16
7 ⁄ 16
5 6
2 1 ⁄ 2
1 ⁄ 2 5 ⁄ 8 3 ⁄ 4 7 ⁄ 8
1 ⁄ 2 5 ⁄ 8 3 ⁄ 4 7 ⁄ 8
1 ⁄ 2 5 ⁄ 8 3 ⁄ 4 7 ⁄ 8
3
6 1 ⁄ 2 7 1 ⁄ 2 8 3 ⁄ 8 9 3 ⁄ 4
3 1 ⁄ 2
4
1
1 1
1
4 1 ⁄ 2
10 1 ⁄ 4 11 3 ⁄ 8
1 1 ⁄ 4 8 to 12 All dimensions are given in inches. Material is carbon steel. Reamers with helical flutes that are left hand are standard. Expansion hand reamers are primarily designed for work where it is necessary to enlarge reamed holes by a few thousandths. The pilots and guides on these reamers are ground undersize for clearance. The maximum expansion on these reamers is as follows: .006 inch for the 1 ⁄ 4 - to 7 ⁄ 16 -inch sizes. .010 inch for the 1 ⁄ 2 - to 7 ⁄ 8 -inch sizes and .012 inch for the 1- to 1 1 ⁄ 4 -inch sizes. Tolerances: On length overall A and flute length B , ± 1 ⁄ 16 inch for 1 ⁄ 4 - to 1-inch sizes, ± 3 ⁄ 32 inch for 1 1 ⁄ 8 -to 1 1 ⁄ 4 -inch sizes; on length of square C , ± 1 ⁄ 32 inch for 1 ⁄ 4 - to 1-inch sizes, ± 1 ⁄ 16 inch for 1 1 ⁄ 8 -to 1 1 ⁄ 4 -inch sizes; on shank diameter D - .001 to - .005 inch for 1 ⁄ 4 - to 1-inch sizes, - .0015 to - .006 inch for 1 1 ⁄ 8 - to 1 1 ⁄ 4 -inch sizes; on size of square, - .004 inch for 1 ⁄ 4 - to 1 ⁄ 2 -inch sizes. - .006 inch for 9 ⁄ 16 - to 1-inch sizes, and - .008 inch for 1 1 ⁄ 8 - to 1 1 ⁄ 4 -inch sizes. 5 4 1 ⁄ 4 1 1 ⁄ 4
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