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Blue Ribbon™ High Speed Twist Drills – #52 (1 Dozen)

Original price was: $25.05.Current price is: $10.02.

SKU: US-9730411790638 Categories: , Tag:

Description

Blue Ribbon™ High Speed Twist Drills – #52 (1 Dozen)

Jobbers length twist drills made of the finest high-speed steel. Heat treated to a hardness of 63–65 HRC and precision-ground to a tolerance of +0.0000 to –0.0003″. Can be used on all metals. Made in USA.

Sold by the dozen.

B&S

Gauge

 Millimeter

(mm)

Inch

(decimal)

 Inch

(fraction)

1 7.348 0.289 —
2 6.543 0.258 —
— 6.350 0.250 1/4
— 5.953 0.234 15/64
3 5.827 0.229 —
— 5.556 0.219 7/32
4 5.189 0.204 —
— 5.154 0.203 13/64
— 4.762 0.188 3/16
5 4.621 0.182 —
— 4.366 0.172 11/64
6 4.115 0.162 —
— 3.969 0.156 5/32
7 3.664 0.144 —
— 3.572 0.141 9/64
8 3.263 0.128 —
— 3.175 0.125 1/8
9 2.906 0.114 —
— 2.778 0.109 7/64
10 2.588 0.102 —
— 2.381 0.094 3/32
11 2.304 0.091 —
12 2.052 0.081 —
— 1.984 0.078 5/64
13 1.828 0.072 —
14 1.628 0.064 —
— 1.588 0.063 1/16
15 1.449 0.057 —
16 1.291 0.051 —
— 1.191 0.047 3/64
17 1.149 0.045 —
18 1.024 0.040 —
19 0.912 0.036 —
20 0.812 0.032 —
— 0.795 0.031 1/32
21 0.723 0.028 —
22 0.644 0.025 —
23 0.573 0.023 —
24 0.511 0.020 —
25 0.455 0.018 —
26 0.405 0.016 —
— 0.396 0.015 1/64
27 0.360 0.014 —
28 0.321 0.013 —
29 0.286 0.011 —
30 0.255 0.010 —
31 0.227 0.0089 —
32 0.202 0.0080 —
33 0.180 0.0071 —
34 0.160 0.0063 —
35 0.142 0.0056 —
36 0.127 0.0050 —
37 0.113 0.0045 —
38 0.101 0.0040 —
39 0.090 0.0035 —
40 0.080 0.0031 —
B&S

Gauge

 Millimeter

(mm)

Inch

(decimal)

 Inch

(fraction)

Drill # Diameter
50 0.070″
51 0.067″
52 0.0635″
53 0.0595″
54 0.055″
55 0.052″
56 0.0465″
57 0.043″
58 0.042″
59 0.041″
60 0.040″
61 0.039″
62 0.038″
63 0.037″
64 0.036″
65 0.035″
66 0.033″
67 0.032″
68 0.031″
69 0.0292″
70 0.028″
71 0.026″
72 0.025″
73 0.024″
74 0.0225″
75 0.021″
76 0.020″
77 0.018″
78 0.016″
79 0.0145″
80 0.0135″

Additional information

Drill Bit Diameter

#50 – 0.070" (2.05mm), #51 – 0.067" (2mm), #52 – 0.063" (1.95mm), #53 – 0.059" (1.85mm), #54 – 0.055" (1.8mm), #55 – 0.052" (1.75mm), #56 – 0.046" (1.65mm), #57 – 0.043" (1.6mm), #58 – 0.042" (1.55mm), #59 – 0.041" (1.5mm), #60 – 0.040" (1.45mm), #61 – 0.039" (1.4mm), #62 – 0.038" (1.35mm), #63 – 0.037" (1.3mm), #64 – 0.036" (1.25mm), #65 – 0.035" (1.2mm), #66 – 0.033" (1.15mm), #67 – 0.032" (1.1mm), #68 – 0.031" (1mm), #69 – 0.029" (0.95mm, #70 – 0.028" (0.9mm), #71 – 0.026" (0.85mm), #72 – 0.025" (0.8mm), #73 – 0.024" (0.75mm), #74 – 0.022" (0.7mm), #75 – 0.021" (0.65mm), #76 – 0.020" (0.6mm), #77 – 0.018" (0.55mm), #78 – 0.016" (0.5mm), #79 – 0.014" (0.4mm), #80 – 0.013" (0.35mm

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