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

$91.18457/EA

Quantity	Price
Quantity	Price
1	$91.18457/ EA

In Stock

Product Specification
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

Size	7/8
Bit Decimal	0.8750
Overall Length	6
Flute Length	3
Shank Type	1/2" Reduced Shank
Material	Cobalt
Origin	Domestic
Weight	0.55,

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

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

Technical Data

Product Specification

Dimensional Specifications

Dimensional SpecificationsCobalt S&D Drill Bit

Drill Feeds & Speeds

Drill Feeds & Speeds