Pre Ream Drill Size

Pre Ream Drill for 3% Ream

Reamer Diameter
Drill for 3% Ream
Decimal Equivalent
1in (1.0000)
31/32
0.9700
63/64 (0.9844)
61/64
0.9549
31/32 (0.9688)
15/16
0.9397
61/64 (0.9531)
59/64
0.9245
15/16 (0.9375)
29/32
0.9094
59/64 (0.9219)
57/64
0.8942
29/32 (0.9062)
7/8
0.8790
57/64 (0.8906)
55/64
0.8639
7/8 (0.8750)
27/32
0.8488
55/64 (0.8594)
53/64
0.8336
27/32 (0.8438)
13/16
0.8185
53/64 (0.8281)
51/64
0.8034
13/16 (0.8125)
25/32
0.7881
51/64 (0.7969)
49/64
0.7730
25/32 (0.7812)
3/4
0.7578
49/64 (0.7656)
18.8MM
0.7426
3/4 (0.7500)
18.3MM
0.7275
47/64 (0.7344)
18.0MM
0.7124
23/32 (0.7188)
17.6MM
0.6972
45/64 (0.7031)
17.2MM
0.6820
11/16 (0.6875)
16.8MM
0.6669
43/64 (0.6719)
16.5MM
0.6517
21/32 (0.6562)
16.1MM
0.6365
41/64 (0.6406)
15.7MM
0.6214
5/8 (0.6250)
15.3MM
0.6063
39/64 (0.6094)
14.9MM
0.5911
19/32 (0.5938)
14.5MM
0.5760
37/64 (0.5781)
14.2MM
0.5608
9/16 (0.5625)
13.8MM
0.5456
35/64 (0.5469)
13.4MM
0.5305
17/32 (0.5312)
13.0MM
0.5153
33/64 (0.5156)
12.6MM
0.5000
1/2 (0.5000)
12.2MM
0.4850
31/64 (0.4841)
15/32
0.4699
15/32 (0.4688)
29/64
0.4547
29/64 (0.4531)
7/16
0.4395
7/16 (0.4375)
27/64
0.4244
27/64 (0.4219)
13/32
0.4092
13/32 (0.4062)
25/64
0.3941
25/64 (0.3906)
V
0.3789
3/8 (0.3750)
23/64
0.3638
23/64 (0.3594)
8.8MM
0.3486
11/32 (0.3438)
8.4MM
0.3335
21/64 (0.3281)
O
0.3183
5/16 (0.3125)
N
0.3031
19/32 (0.2969)
7.25MM
0.2880
9/32 (0.2812)
6.9MM
0.2728
17/64 (0.2656)
F
0.2576
1/4 (0.2500)
6.1MM
0.2425
15/64 (0.2344)
5.7MM
0.2274
7/32 (0.2188)
4
0.2122
13/64 (0.2031)
9
0.1970
3/16 (0.1875)
15
0.1819
11/64 (0.1719)
4.2MM
0.1667
5/32 (0.1562)
25
0.1516
9/64 (0.1406)
3.4MM
0.1364
1/8 (0.1250)
3.0MM
0.1213