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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