Introducing our premium 3 Packs Spiral Step Drill Bit Set, designed specifically for professionals seeking precision and efficiency in their drilling tasks. Crafted with utmost care and precision, these drill bits boast a spiral flute design that ensures smooth and effortless drilling through various materials, including metal, wood, and plastic. The set includes three different sizes, allowing for versatility and adaptability to tackle a wide range of projects. With their durable construction and high-speed steel composition, these drill bits offer exceptional durability and longevity, making them an indispensable tool for professionals in construction, woodworking, and metalworking industries. Elevate your drilling experience with our Spiral Step Drill Bit Set and achieve impeccable results every time.
Processing impact editing
(1) The diameter of Twist Drill is limited by the aperture, the spiral groove makes the drill core thinner, the Drill Bit stiffness is low; With only two ribbed guides, the axis of the hole is easy to skew; The horizontal edge makes centering difficult, axial resistance increases, and the bit is easy to swing. Therefore, the shape and position error of the drilled hole is large.
(2) Twist drill before and after the Tool surface are curved, along the main cutting edge of each point of the front Angle, the rear Angle is not the same, the front Angle of the horizontal edge of -55°. Poor cutting conditions; The distribution of cutting speed along the cutting edge is not reasonable, and the cutting speed of the tip with the lowest strength is the highest, so the wear is serious. Therefore, the hole precision of processing is low.
(3) The whole edge of the main cutting edge of the drill participates in cutting, and the cutting speed of each point on the edge is not equal, which is easy to form spiral chips and difficult to discharge chips. Therefore, the chip and the hole wall extrusion friction, often scratch the hole wall, the surface roughness after processing is very low.
Model NO. GMSD367
Transport Package on Request
Specification all sizes are available
1.Are you manufacturer? Do you have factory? We are Professional manufacturer ,we have more than 5 years experience in this field. 2.Does free shipping is possible? We don't offer free shipping service, but we will give you some discount if you buy large quantity products. 3.Can you send products to our Forwarder in China? Yes, if you have forwarder in China,Hole Cutter Step Drill Bits i will glad to send products to him/her. 4.Do you make OEM? Yes, we do. We have laser machine, can laser your logo and sizes on the body of milling cutter, also can print labels. 5.How about the delivery time? According to the sizes and quantity, delivery time is different. Usually be 5~10 days. We can tell you exact inventory state if you need. 6.Can you produce carbide Special tool ? Yes We can. From 2013 year. Our factory main market is from standard end mills to special tools. Special tool according your drawing and sample. 
Material | Component (%) |
| HSS 4241 | C (0.9~1.0); Si(1.0~1.3); Mn(0.25~0.4); P(0~0.035); S(0~0.009);
Cr(3.8~4.2); Mo(0.55~0.85); W(1.6~2.0); V (0.4~0.65); Co(0) |
| HSS 4341 | C (0.83~0.93); Si(0.2~0.4); Mn(0.2~0.4); P(0~0.03); S(0~0.009);
Cr(3.8~4.4); Mo(2.5~3.5); W(3.5~4.5); V (1.2~1.8); Co(0) |
| HSS 6542 (M2) | C (0.8~0.9); Si(0.2~0.45); Mn(0.15~0.4); P(0~0.03); S(0~0.009);
Cr(3.8~4.4); Mo(4.6~4.9); W(5.6~5.9); V(1.8~2.0); Co(0) |
| HSS 9341 | C (0.77~0.87); Si(0.2~0.4); Mn(0.2~0.4); P(0~0.03); S(0~0.009);
Cr(3.8~4.4); Mo(2.7~3.3); W(8.5~9.5); V(1.3~1.7); Co(0) |
| HSS M35 (Co5%) | C (0.8~0.9); Si(0.2~0.45); Mn(0.15~0.4); P(0~0.03); S(0~0.009);
Cr(3.8~4.4); Mo(4.6~4.9); W(5.6~5.9);V(1.8~2.0); Co(4.6~4.9 |
Q&A:
1.Are you manufacturer? Do you have factory?
We are Professional manufacturer ,we have more than 5 years experience in this field.
2.Does free shipping is possible?
We don't offer free shipping service, but we will give you some discount if you buy large quantity products.
3.Can you send products to our Forwarder in China?
Yes, if you have forwarder in China, i will glad to send products to him/her.
4.Do you make OEM?
Yes, we do. We have laser machine, can laser your logo and sizes on the body of milling cutter, also can print labels.
5.How about the delivery time?
According to the sizes and quantity, delivery time is different. Usually be 5~10 days. We can tell you exact inventory state if you need.
6.Can you produce carbide Special Tool ?
Yes We can. From 2013 year. Our factory main market is from standard end mills to special tools. Special tool according your drawing and sample.
Product Categories : Drill Bit > Step Dril Bit
