Crown Grinding & Machining Precision Grinding To Your Custom Specifications
with Tight Tolerances, Parallelism, Flatness and Squareness.
“We look forward to the opportunity to work with you and invite any inquires concerning
your steel grinding and steel needs”.Robert Mendala
CNC fly cutting for quick and accurate material removal
Mattison finish grinding to tolerances +.001 / -0. Also 6 side finish grinding for cavity, core and forging dies
Blanchard grinding up to 90" corner to corner larger grinding avail upon request
Ability to read prints, cad files, dxf dwg, pdf, along with any parasoild xt files
Before finish grinding we have the capabilities to machine pockets, holes, gun drilling and side work
Chamfering of all corners available
Milling of edges and ends sq .001-.002"
We can supply you with flame cut A36 #1, 4130PH #2 , and PH stainless #7 steel. Other steel and stress reliving available upon request
Crown Grinding & Machining Located at 1498 Louis Bork Drive Batavia, IL 60510-1511
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Crown Grinding & Machining
Crown Grinding & Machining 1498 Louis Bork Drive Batavia, IL 60510-1511
Phone: (630) 406-9601 www.crowngrinding.com
Drill Size Decimal eQUiValent tap Size
80 .01351 79 .0145
64 .015678 .016077 .018076 .020075 .021074 .022573 .024072 .025071 .026070 .028069 .0292
1 68 .031032 .0312
67 .032066 .033065 .035064 .036063 .037062 .038061 .039060 .040059 .041058 .042057 .0430
3 56 .046564 .0469 0 - 80
55 .052054 .0550
1 53 .0595 1 - 64, 7216 .0625
52 .063551 .067050 .0700 2 - 56, 6449 .0730
5 48 .076064 .0781
47 .0785 3 - 4846 .081045 .0820 3 - 5644 .086043 .0890 4 - 40
3 42 .0935 4 - 4832 .0938
41 .096040 .098039 .099538 .1015 5 - 4037 .1040 5 - 44
7 36 .1065 6 - 3264 .1094
35 .110034 .111033 .1130 6 - 4032 .1160
1 31 .12008 .1250
30 .128529 .1360 8 - 32, 36
9 28 .140564 .1406
27 .144026 .147025 .1495 10 - 2424 .1520
5 23 .154032 .1562
22 .157021 .1590 10 - 3220 .161019 .1660
11 18 .169564 .1719
17 .173016 .1770 12 - 2415 .180014 .1820 12 - 28
3 13 .185016 .1875
12 .189011 .1910
metric tap Drill SizeSmetric tap tap Drill (mm) Decimal (inch)
m1.6 x 0.35 1.25 .0492m1.8 x 0.35 1.45 .0571m2 x 0.4 1.60 .0630m2.2 x 0.45 1.75 .0689m2.5 x 0.45 2.05 .0807m3 x 0.5 2.50 .0984m3.5 x 0.6 2.90 .1142m4 x 0.7 3.30 .1299m4.5 x 0.75 3.70 .1457m5 x 0.8 4.20 .1654m6 x 1 5.00 .1968m7 x 1 6.00 .2362m8 x 1.25 6.70 .2638m8 x 1 7.00 .2756m10 x 1.5 8.50 .3346m10 x 1.25 8.70 .3425m12 x 1.75 10.20 .4016m12 x 1.25 10.80 .4252m14 x 2 12.00 .4724m14 x 1.5 12.50 .4921m16 x 2 14.00 .5512m16 x 1.5 14.50 .5709m18 x 2.5 15.50 .6102m18 x 1.5 16.50 .6496m20 x 2.5 17.50 .6890m20 x 1.5 18.50 .7283m22 x 2.5 19.50 .7677m22 x 1.5 20.50 .8071m24 x 3 21.00 .8268m24 x 2 22.00 .8661m27 x 3 24.00 .9449m27 x 2 25.00 .9843m30 x 3.5 26.50 1.0433m30 x 2 28.00 1.1024m33 x 3.5 29.50 1.1614m33 x 2 31.00 1.2205m36 x 4 32.00 1.2598m36 x 3 33.00 1.2992m39 x 4 35.00 1.3780m39 x 3 36.00 1.4173
Drill Size Decimal eQUiValent tap Size
10 .19359 .19608 .1990
13 7 .2010 1/4 - 2064 .2031
6 .20405 .20554 .2090
7 3 .2130 1/4 - 2832 .2188
2 .22101 .2280
15 a .234064 .2344
B .2380c .2420
1 D .24604 e .2500
F .2570 5/16 - 1817 G .261064 .2656
H .2660i .2720 5/16 - 24J .2770
9 K .281032 .2812
l .290019 m .295064 .2969
5 n .302016 .3125 3/8 - 16
O .316021 p .323064 .3281
Q .3320 3/8 - 2411 r .339032 .3438
S .348023 t .358064 .3594
3 U .3680 7/16 - 148 .3750
V .377025 W .386064 .3906 7/16 - 20
X .397013 Y .404032 .4062
27 z .413064 7 .4219 1/2 - 1329 16 .437564 15 .4531 1/2 - 2031 32 .468864 1 .4844 9/16 - 1233 2 .500064 17 .5156 9/16 - 1835 32 .5312 5/8 - 1164 9 .546937 16 .562564 19 .5781 5/8 - 1839 32 .593864 5 .609441 8 .625064 21 .640643 32 .6562 3/4 - 1064 11 .671945 16 .6875 3/4 - 1664 23 .703147 32 .718864 3 .734449 4 .750064 25 .7656 7/8 - 951 32 .781264 13 .796953 16 .8125 7/8 - 1464 27 .828155 32 .843864 7 .859457 8 .8750 1 - 864 29 .8906
32 .9062
Drill Size Decimal eQUiValent tap Size
5964 15 .9219 1 - 1261 16 .9375 1 - 1464 31 .953163 32 .968864 .9844 11/8 - 7
1 1.000013/64 1.0469 11/8 - 1217/64 1.1094 11/4 - 7
11/8 1.1250111/64 1.1719 11/4 - 12
17/32 1.2188 13/8 - 611/4 1.2500
119/64 1.2969 13/8 - 12111/32 1.3438 11/2 - 6
13/8 1.3750127/64 1.4219 11/2 - 12
11/2 1.5000
Inch/MetrIc tap DrIll SIzeS & DecIMal equIvalentS
Bulletin 1214-5M/S 05/10 starrett.com
pipe tHreaD SizeS (npSc)tHreaD Drill tHreaD Drill
1/8 – 27 11/32 11/2 – 111/2 13/41/4 – 18 7/16 2 – 111/2 27/323/8 – 18 37/64 21/2 – 8 221/321/2 – 14 23/32 3 – 8 31/43/4 – 14 59/64 31/2 – 8 33/41 – 111/2 15/32 4 – 8 41/4
11/4 – 111/2 11/2
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