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Cobalt S&D Reduced Shank Drill Bit

Cobalt S&D drill bits expands the size range capacity of a 1/2" portable drill chuck. Common flute and overall length for minimal adjustment during tool changes. Precision ground for high degree of concentricity between shank and body diameter. Ideal for drilling in tough, high tensile strength materials. The 135º split point reduces thrust and eliminates walking at the drill point.

Products
Dimensional Specifications
Drill Feeds & Speeds

Dimensional Specifications

Dimensional SpecificationsCobalt S&D Drill Bit

Size	Decimal Equivalent	Flute Length	Overall Length
33/64	0.5156	3	6
17/32	0.5313	3	6
35/64	0.5469	3	6
9/16	0.5625	3	6
37/64	0.5781	3	6
19/32	0.5938	3	6
39/64	0.6094	3	6
5/8	0.6250	3	6
41/64	0.6406	3	6
21/32	0.6563	3	6
43/64	0.6719	3	6
11/16	0.6875	3	6
45/64	0.7031	3	6
23/32	0.7188	3	6
47/64	0.7344	3	6
3/4	0.7500	3	6
49/64	0.7656	3	6
25/32	0.7813	3	6
51/64	0.7969	3	6
13/16	0.8125	3	6
53/64	0.8281	3	6
27/32	0.8438	3	6
55/64	0.8594	3	6
7/8	0.8750	3	6
57/64	0.8906	3	6
29/32	0.9063	3	6
59/64	0.9219	3	6
15/16	0.9375	3	6
61/64	0.9531	3	6
31/32	0.9688	3	6
63/64	0.9844	3	6
1	1.0000	3	6
1 1/32	1.0313	3	6
1 1/16	1.0625	3	6
1 3/32	1.0938	3	6
1 1/8	1.1250	3	6
1 5/32	1.1563	3	6
1 3/16	1.1875	3	6
1 7/32	1.2188	3	6
1 1/4	1.2500	3	6
1 9/32	1.2813	3	6
1 5/16	1.3125	3	6
1 11/32	1.3438	3	6
1 3/8	1.3750	3	6
1 13/32	1.4063	3	6
1 7/16	1.4375	3	6
1 15/32	1.4688	3	6
1 1/2	1.5000	3	6

All dimensions are in inches.

Drill Feeds & Speeds

Material	Hardness	Drill Type	Point Style	Point Angle	Speed (SFM)	Feed	Coolant
Aluminum / Aluminum Alloys	-	High Helix	Standard	118°	200-300	Medium to Heavy	Water Soluble
Aluminum Bronze	-	High Helix	Standard	118°	50-100	Medium to Heavy	Water Soluble
Brass, Free Machining	-	Low Helix	Standard	118°	100-250	Medium to Heavy	Water Soluble
Bronze, Soft Medium	Below 200	General Purpose	Standard	118°	70-150	Medium to Heavy	Water Soluble
Bronze, High Tensile	-	Low Helix or Half RD	Standard	118°	50-100	Medium to Heavy	Water Soluble
Copper / Copper Alloys	-	General Purpose	Standard	118°	100-200	Medium	Water Soluble
High Temp Alloys, Cobalt Base	180-300	Cobalt	Split Point	135°	5-20	Medium	Activated Oils
High Temp Alloys, Iron Base	180-300	Cobalt	Split Point	135°	5-20	Medium	Activated Oils
High Temp Alloys, Nickel Base	180-300	Nitro® or Cobalt	Split Point	135°	5-15	Medium	Activated Oils
Iron, Soft Case	Up to 150	Heavy Duty or Nitro®	Split Point	135°	75-150	Medium	Dry / Air
Iron, Medium Case	150-250	Heavy Duty or Nitro®	Split Point	135°	50-100	Medium	Dry / Air
Iron, Hard Case	Over 250	Carbide	Standard	118°	40-75	Light to Medium	Dry / Air
Plastic & Related Materials	-	Low Helix	Low Angle	90°	100-200	Medium to Heavy	Dry / Air
Steel, Low Carbon Alloy	125-275	General Purpose	Standard	118°	50-70	Medium	Water Soluble
Steel, Medium Carbon Alloy	275-325	Heavy Duty or Nitro®	Split Point	135°	40-55	Medium	Water Soluble
Steel, High Carbon Alloy	Over 325	Cobalt	Split Point	135°	30-50	Medium	Water Soluble
Steel, Low & Medium Carbon Alloy	Below 175	General Purpose	Standard	118°	45-95	Medium to Heavy	Water Soluble
Steel, High Carbon Alloy	175-225	General Purpose	Standard	118°	45-65	Medium	Water Soluble
Stainless Steel, Austenitic	Below 300	Heavy Duty or Nitro®	Split Point	135°	40-60	Medium to Heavy	Water Soluble
Stainless Steel, Precipitation	Over 300	Cobalt	Split Point	135°	20-40	Medium	Cutting Oil

Feeds – Feed rates for drilling are governed by the drill diameter, machinability of materials and depth of hole.
Speeds – The speed of a drill is determined by the rate which the outer periphery of the tool rotates in relation to material being cut. In general, the SFM at which a drill will operate is within a range based upon the workpiece material, its condition, hardness and depth of hole. It is usually advisable to start the drilling process at a slower SFM and then increase to the maximum.
RPM = (SFM x 3.82) divided by TD = Revolutions Per Minute
SFM = RPM x TD x .262 = Surface Feet Per Minute
TD – Tool diameter in inches

Cobalt S&D Reduced Shank Drill Bit

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Size Bit Decimal Overall Length Shank Type Item # Availability Price Quantity UOM

9/16

0.5625

1/2" Reduced Shank

DRIL9/16C

In Stock

$62.78237/EA

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9/16 COBALT S&D DRILL BIT 1/2" REDUCED SHANK

$62.78237/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$62.78237/ EA

5/8

0.6250

1/2" Reduced Shank

DRIL5/8C

In Stock

$66.42661/EA

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5/8 COBALT S&D DRILL BIT 1/2" REDUCED SHANK

$66.42661/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$66.42661/ EA

11/16

0.6875

1/2" Reduced Shank

DRIL11/16C

In Stock

$75.03708/EA

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11/16 COBALT S&D DRILL BIT 1/2" REDUCED SHANK

$75.03708/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$75.03708/ EA

3/4

0.7500

1/2" Reduced Shank

DRIL3/4C

In Stock

$87.87879/EA

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3/4 COBALT S&D DRILL BIT 1/2" REDUCED SHANK

$87.87879/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$87.87879/ EA

13/16

0.8125

1/2" Reduced Shank

DRIL13/16C

In Stock

$91.87328/EA

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13/16 COBALT S&D DRILL BIT 1/2" REDUCED SHANK

$91.87328/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$91.87328/ EA

7/8

0.8750

1/2" Reduced Shank

DRIL7/8C

In Stock

$103.85675/EA

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7/8 COBALT S&D DRILL BIT 1/2" REDUCED SHANK

$103.85675/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$103.85675/ EA

15/16

0.9375

1/2" Reduced Shank

DRIL15/16C

2-4 Working Days

$108.00275/EA

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15/16 COBALT S&D DRILL BIT 1/2" REDUCED SHANK

$108.00275/EA

Qty

2-4 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$108.00275/ EA

1.0000

1/2" Reduced Shank

DRIL1C

In Stock

$126.51211/EA

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1 COBALT S&D DRILL BIT 1/2" REDUCED SHANK

$126.51211/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$126.51211/ EA