1/4 NITRO STUBBY DRILL BIT

$4.6993/EA

Quantity	Price
Quantity	Price
1	$4.6993/ EA

In Stock

Product Specification
Dimensional Specifications
Drill Feeds & Speeds

Dimensional Specifications

Dimensional SpecificationsNitro Stubby

Size	Decimal Equivalent	Flute Length	Overall Length
1/16	0.0625	5/8	1 5/8
5/64	0.0781	11/16	1 11/16
3/32	0.0938	3/4	1 3/4
7/64	0.1094	13/16	1 13/16
1/8	0.1250	7/8	1 7/8
9/64	0.1406	15/16	1 15/16
5/32	0.1563	1	2 1/16
11/64	0.1719	1 1/16	2 1/8
3/16	0.1875	1 1/8	2 3/16
13/64	0.2031	1 3/16	2 1/4
7/32	0.2188	1 1/4	2 3/8
15/64	0.2344	1 5/16	2 7/16
1/4	0.2500	1 3/8	2 1/2
17/64	0.2656	1 7/16	2 5/8
9/32	0.2813	1 1/2	2 11/16
19/64	0.2969	1 9/16	2 3/4
5/16	0.3125	1 5/8	2 13/16
21/64	0.3281	1 11/16	2 15/16
11/32	0.3438	1 11/16	3
23/64	0.3594	1 3/4	3 1/16
3/8	0.3750	1 13/16	3 1/8
25/64	0.3906	1 7/8	3 1/4
13/32	0.4063	1 15/16	3 5/16
27/64	0.4219	2	3 3/8
7/16	0.4375	2 1/16	3 7/16
29/64	0.4531	2 1/8	3 9/16
15/32	0.4688	2 1/8	3 5/8
31/64	0.4844	2 3/16	3 11/16
1/2	0.5000	2 1/4	3 3/4

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	1/4
Bit Decimal	0.2500
Overall Length	2 1/2
Flute Length	1 3/8
Shank Type	Straight
Material	High Speed Steel
Origin	Domestic
Weight	0.027,

1/4 NITRO STUBBY DRILL BIT

1/4 NITRO STUBBY DRILL BIT

Technical Data

Product Specification

Dimensional Specifications

Dimensional SpecificationsNitro Stubby

Drill Feeds & Speeds

Drill Feeds & Speeds