Spiral HSS Step Drill Bits

• Customization: Available
• Customized: Customized
• Standard: DIN, JIS, AISI
• Model NO.: metric and inch
• Size: 4mm to 35mm
• Transport Package: on Request
• Specification: Metric Inch
• Trademark: stc
• Origin: Jiansu
• HS Code: 82075090
• Production Capacity: 50000PCS/Month

Product Description

We make CBN fully ground HSS step drill bits. Made from high grades high speed steel, tin coating and tialn coating both avialable.

Kinds of sets are available.

Tin coating, tialn coating available.

Laser marking.

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