HSS DRILL SET 29 PC, LEFT HAND 1/16-1/2 BY 64THS

Set of Left Hand drill bits ranging from 1/16" to 1/2" in diameter in 64th (imperial inch) increments, with a straight shank and a 118° point. Used in close center multiple spindle gear driven drilling heads, where adjacent spindles operate alternately left and right hand. They are also used in left hand screw machines. Can be used to drill out broken bolts.

$321.08878/EA

Quantity	Price
Quantity	Price
1	$321.08878/ EA
4	$311.43786/ EA
8	$284.32216/ EA
24	$242.12454/ EA

Qty

In Stock

Product Specification
Tab 4
Tab 1

Size	Set 1/16 - 1/2
Shank Type	Straight
Material	High Speed Steel
Origin	Domestic
Weight	3.21,

Tab 4

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

Tab 1

Fractional SizesLeft Hand HSS Drill Bit

Size	Decimal Equivalent	Flute Length	Overall Length
1/16	0.062500	7/8	1 7/8
5/64	0.078125	1	2
3/32	0.093750	1 1/4	2 1/4
7/64	0.109375	1 1/2	2 5/8
1/8	0.125000	1 5/8	2 3/4
9/64	0.140625	1 3/4	2 7/8
5/32	0.156250	2	3 1/8
11/64	0.171875	2 1/8	3 1/4
3/16	0.187500	2 5/16	3 1/2
13/64	0.203125	2 7/16	3 5/8
7/32	0.218750	2 1/2	3 3/4
15/64	0.234375	2 5/8	3 7/8
1/4	0.250000	2 3/4	4
17/64	0.265625	2 7/8	4 1/8
9/32	0.281250	2 15/16	4 1/4
19/64	0.296875	3 1/16	4 3/8
5/16	0.312500	3 3/16	4 1/2
21/64	0.328125	3 5/16	4 5/8
11/32	0.343750	3 7/16	4 3/4
23/64	0.359375	3 1/2	4 7/8
3/8	0.375000	3 5/8	5
25/64	0.390625	3 3/4	5 1/8
13/32	0.406250	3 7/8	5 1/4
27/64	0.421875	3 15/16	5 3/8
7/16	0.437500	4 1/16	5 1/2
29/64	0.453125	4 3/16	5 5/8
15/32	0.468750	4 5/16	5 3/4
31/64	0.484375	4 3/8	5 7/8
1/2	0.500000	4 1/2	6

All dimensions are in inches.

HSS DRILL SET 29 PC, LEFT HAND 1/16-1/2 BY 64THS

HSS DRILL SET 29 PC, LEFT HAND 1/16-1/2 BY 64THS

Technical Data

Product Specification

Tab 4

Drill Feeds & Speeds

Tab 1

Fractional SizesLeft Hand HSS Drill Bit