Helix /Spiral Flute Step Drill Bits

• Customized: Customized
• Standard: DIN, JIS, AISI
• Length: Jobber-length
• Type: Twist Drill Bit
• Material: High Speed Steel
• Usage: Metal Drilling
• Model NO.: metric and inch
• Transport Package: on Request
• Specification: DIN ANSI
• Trademark: stc
• Origin: Jiangsu
• HS Code: 82075090
• Production Capacity: 50000PCS/Month

Product Description

We made CBN ground spiral flute step drill bits.

It is made from high grade of high speed steel.

Round shank, hex shank available.

Tin coating and Tialn coating availabe.

Sets on request.
 

STC001, HSS STEPS DRILL
Material: HSS.
Bright Finishing or Tin-coated.
	Pict
STC001A, INCH SIZES STEPS DRILL
No. of Holes	Description			Shank Diameter	Step Thickness
13	1/8" - 1/2" by 1/32" increase			1/4"	1/8"
6	3/16" - 1/2" by 1/16" increase			1/4"	3/8"
9	1/4" - 3/4" by 1/16" increase			3/8"	1/8"
12	3/16" - 7/8" by 1/16" increase			3/8"	1/8"
10	1/4" - 1.3/8" by 1/8" increase			1/2"	1/8"
STC001A, INCH SIZES STEPS DRILL
No. of Holes	Description				Shank Diameter
9	4 - 12mm by 1mm Increase				6/6.5mm
5	4 - 12mm by 2mm Increase				6/6.5mm
7	6 - 18mm by 2mm Increase				10mm
8	6 - 20mm by 2mm Increase				8mm
12	6 - 30mm by 2/3mm Increase				10mm
9	4 - 20mm by 2mm Increase				10mm
10	4 - 22mm by 2mm Increase				10mm
14	4 - 30mm by 2 mm increase				14mm
13	5 - 35mm by 2/3mm Increase				13mm
STC001-S, STEPS DRILL SET
	Pict
Model	pcs/set	DESCRIPTION		PACKING
STC001-S1	3pcs/set	4 - 12 x 9		Metal / wood / plastic
		4 - 20 x 9
		4 - 30 x 14
STC001-S2	3pcs/set	4 - 12 x 5		Metal / wood / plastic
		4 - 20 x 9
		4 - 32 x 15
STC001-S3	3pcs/set	4 - 12 x 9		Metal / wood / plastic
		6 - 20 x 8
		6 - 30 x 13
STC001-S4	3pcs/set	3/16" - 1/2" x 6		Metal / wood / plastic
		1/8" - 1/2" x 13
		1/4" - 3/4" x 9