Page 141 - Michigan Drill

Single-Flute Countersinks

High Speed Steel & Cobalt
For use in chamfering, deburring, countersinking and enlarging
holes in sheet metal while providing a smooth surface finish.
They will countersink holes much smaller than other styles
and should be operated at comparatively high speeds.
List No. 490 – 60° H.S. List No. 493 – 100° H.S.
List No. 491 – 82° H.S. List No. 489* – 120° H.S. COUNTERSINKS
List No. 492 – 90° H.S. List No. 491C – 82° Cobalt
Price Each Price Each
Size Shank Overall H.S. Cobalt Size Shank Overall H.S. Cobalt
Diameter Length All angles 82° Diameter Length All angles 82°
1/8 1/8 1-1/4 7.21 17.70 3/4 1/2 2-5/8 25.87 63.52
3/16 3/16 1-1/2 7.89 19.83 7/8 1/2 2-3/4 34.98 85.86
1/4 1/4 1-1/2 9.57 24.12 1 1/2 2-3/4 44.22 108.54
5/16 1/4 1-5/8 10.23 25.12 1-1/4 1/2 2-3/4 77.60 181.40
3/8 1/4 1-3/4 10.89 26.74 1-1/2 3/4 2-7/8 110.57 226.18
1/2 1/4 2 13.99 34.36 1-3/4 3/4 3 139.48 319.96
5/8 3/8 2-1/4 19.24 47.68 2 3/4 3-1/4 187.41 368.02
* 120° available in 1/4 to 1" Only
U.S.A. Sets
H.S. 60° H.S. 82° H.S. 90° H.S. 100° H.S. Cobalt 82° Cobalt
Sizes Pieces
Set No. Set No. Set No. Set No. Price Set No. Price
1/4, 3/8, 1/2, 5/8, 3/4 5 490S5 491S5 492S5 493S5 83.21 491CS5 200.07
1/4, 3/8, 1/2, 5/8, 3/4, 1, 9 490S9 491S9 492S9 493S9 507.46 491CS9 1088.66
1-1/4, 1-1/2, 2
3/16, 1/4, 5/16, 3/8, 1/2, 5/8, 12 490S12 491S12 492S12 493S12 560.19 491CS12 1219.47
3/4, 7/8, 1, 1-1/4, 1-1/2, 2
All sets are supplied in wood block
List No. X490 – 60° H.S.
List No. X491 – 82° H.S. List No. X493 – 100° H.S.
List No. X492 – 90° H.S. List No. X494 – 110° H.S.

Size Shank Overall Price Size Shank Overall Price
Diameter Length Each Diameter Length Each
3/16 3/16 1-1/2 4.03 3/4 1/2 2-1/2 14.57
1/4 3/16 1-1/2 4.03 7/8 1/2 2-1/2 17.10
1/4 1/4 1-1/2 4.03 1 1/2 2-3/4 19.70
5/16 1/4 1-3/4 5.68 1-1/4 1/2 3-3/8 29.25
3/8 1/4 1-3/4 5.68 1-1/4 3/4 3-3/8 29.25
1/2 1/4 2 6.29 1-1/2 1/2 3-1/2 39.33
1/2 3/8 2 6.29 1-1/2 3/4 3-1/2 39.33
5/8 3/8 2-1/4 11.29 2 1/2 4 71.61
5/8 1/2 2-1/4 11.29 2 3/4 4 71.61
3/4 3/8 2-1/4 14.57

Import Sets

Sizes Pieces H.S. 60° H.S. 82° H.S. 90° Price
Set No.
Set No.
Set No.
1/4 x 1/4, 3/8 x 1/4, 1/2 x 1/4, 5/8 x 3/8, 3/4 x 3/8 5 X490S X491S X492S 46.86
Single-Flute

Double End Countersinks

High Speed Steel
List No. 491D – 82° H.S.

Size Shank Overall Price
Diameter Length Each
1/4 1/4 1-1/2 14.50
5/16 1/4 1-5/8 15.88
3/8 1/4 1-3/4 18.78
1/2 1/4 2 21.24
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