Carbide Pilot Hole Correction Boring Bit (Part Numbers)

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In case the hole pitch has an intersection or the inclination tolerance of the hole is demanding.
By using it before finishing the reamer, the bend of the hole can be modified.

Part Number

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the corresponding part number is displayed here.

Drawing
Part Numbers
Specification and price
Features and examples

Carbide Pilot Hole Correction Boring Bit:Related Image

Data to be displayed: 30; 45; 60

Part Number
BRB3-[1.8-2/0.1]-[6-10/1]
BRB4-[1.8-3.5/0.1]-[6-15/1]
BRB6-[2.5-5/0.1]-[10-20/1]

Minimum order quantity	Standard Shipping Days ?	Tool Diameter (mm)	No.	Shank Diameter d (mm)	Overall Length L (mm)	Runout Length (ℓ) (mm)
1	8 Days	1.8 ～ 2	3	3	40	6 ～ 10
1	8 Days	1.8 ～ 3.5	4	4	50	6 ～ 15
1	8 Days	2.5 ～ 5	6	6	60	10 ～ 20

Specifications

Model Number		Flute Diameter D 0.1 mm Increment Designation	Recess Length ℓ 1 mm Increment Designation	Overall Length L	Shank Diameter d
	No.
BRB	3	1.8 ~ 2.0	6 ~ 10	40	3
	4	1.8 ~ 2.4	6 ~ 10	50	4
		2.5 ~ 3.5	10 ~ 15
	6	2.5 ~ 3.0	10 ~ 15	60	6
		3.1 ~ 5.0	10 ~ 20

More Information

● When there is tolerance on the hole pitch, or when the allowable margin of error in the hole inclination is very limited, the use of this product before finishing with a reamer allows the hole skew to be corrected.

■Reference examples of machining process
(when positional accuracy, diameter precision, or surface roughness are required)

Finished Diameter	Diameter of Pilot Hole (drill diameter)	Diameter of Pilot Hole (bit diameter)	Spiral Reamer	Pentagonal, Hexagonal Reamer
Ø 2.0	Ø 1.7	Ø 1.8	Ø 1.98	Ø 2.00
Ø 2.5	Ø 2.2	Ø 2.3	Ø 2.48	Ø 2.50
Ø 3.0	Ø 2.7	Ø 2.8	Ø 2.98	Ø 3.00
Ø 3.5	Ø 3.2	Ø 3.3	Ø 3.48	Ø 3.50
Ø 4.0	Ø 3.7	Ø 3.8	Ø 3.98	Ø 4.00
Ø 4.5	Ø 4.2	Ø 4.3	Ø 4.48	Ø 4.50
Ø 5.0	Ø 4.7	Ø 4.8	Ø 4.98	Ø 5.00

[ ! ]Machine the finished diameter with a spiral reamer, after drilling pilot holes, if only positional accuracy is required. (a pentagonal or hexagonal reamer is not required)

■ Cutting Conditions

Bit Diameter	Feed Rate F (mm/min)	Revolution Speed (min^-1)
Ø 1.8	22	3,700
Ø 2.3	25	3,400
Ø 2.8	27	3,100
Ø 3.3	28	2,900
Ø 3.8	30	2,700
Ø 4.3	31	2,500
Ø 4.8	32	2,300

Basic information

Shank type	End Mill Shank	Work Material	General Steel / Heat-Treated Steel / Stainless Steel / Cast Iron / Aluminum / Copper	Coating Presence	None
Groove Shape	Straight	Base-Blade Availability	None	Diameter Tolerance(mm)	-0.02 ~ 0
Tool Material Type	Carbide