Twist Drill Bit HSS-R Roll-Forged

Twist Drill Bit HSS-R Roll-Forged, DIN1870 HSS Morse Taper Shank Twist Extra Long Drill Bit for Metal, HSS4341 Three-flat Shank Twist Drill Bits Turbomax Tip, HSS-R 4341 Twist Taper Length Drill Bit Black Rolled Polished, HSS Left Hand Twist M35 Cobalt Drill Bit, Stainless Steel and Harded Steel Din 338 HSS Twist Drill Bits, Rolled & Polished, Roll Forged, Fully Ground, Reduced Shank, Milled Types DIN338 HSS Straight Shank Twist Drill Bits China Supplier Factory

Twist Drill Bit HSS-R Roll-Forged  Technical Specifications

Features
Designed to offer the best balance between drilling performance and price
Specially designed tip with split point and 118-degree angled tip for precise self-centering and fast start
Good fracture resistance thanks to the precise roll forging production process
More sizes available, contact us
Applications
Drilling in unalloyed or low-alloy steel with a hardness of up to 400 N/mm2 as well as everyday drilling in aluminum
Facade installation, general steel and metal fabrication and construction work such as decking, roofing, handrails and electrical box installation or installations on beams
For longer lifetime and better performance we advise using a lubricant with the HSS-R bits

Process of HSS Twist Drill Bits
Milling method
Milling the required shape of the spiral groove with a forming cutter on the unhardened twist drill blank. The milling method has a large twist drill manufacturing processing range, mainly processing 2.5 to 70 mm twist drill.
The disadvantage of the milling method is the high cost of the tool, long twist drill manufacturing processing time, and finish the final shape before heat treatment processing. During heat treatment, there will happen geometry errors, almost all of which are reflected in the finished drill bit.

Rolling
The drill is rolled on a heated blank with four fan-shaped plates to form the shape of the drill bit.
Compared with the milling method, using plastic deformation of the drill bit manufacturer with less accuracy, in addition, due to the heat treatment, the geometry of the rolling twist drill will change, making it impossible to meet the requirements of drilling high-quality holes.
The main advantage of this method is to save the raw materials for the manufacture of a twist drill, with a good economy.

Grinding
The newest type of twist drill manufacturing processing.
When the wheel speed reaches 100m/s, makes the spiral groove of the twist drill to be ground out of the whole material, high-speed grinding can reduce the cutting force, greatly improve the surface quality and reduce the shape error. Compared with the milling method, the grinding method can greatly reduce the working time of a single piece, high quality, and stability.
At present, the grinding twist drill manufacturing method can only manufacture the diameter of 15 or smaller twist drills. HSS M2 Taper Shank Twist Drill Bit 6-100mm For Metal Cutting

HSS Twist Drill Bits
Manufacturing	Surface Finish						Sharpening
	White	Black	Black&White	TIN Coated	Amber	Black&Gold	118°	135°
Roll Forged		√	√				√	√
Rolled Polished	√	√	√	√	√		√	√
Fully Ground	√	√	√	√	√	√	√	√
Milled	√	√	√	√		√	√
Standards	DIN338, DIN340, DIN1897, DIN1869, DIN345, DIN341
	Jobber Length, Taper Length, Screw Machine Length, Aircraft Extension, Taper Shank(ANSI)
Material	HSS4241, HSS4341, HSS9341, HSS6542(M2), HSS CO5%(M35), HSS CO8%(M42)
Shank	Straight Shank, Taper Shank, Three Flats Shank, Hexagonal Shank, 1/2″  3/8″ Reduced Shank
Helix Angle	Type N, Type W, Type H
Rotating	Right Hand, Left Hand
Flute	Normal Parabolic

 

Diameter	Overall length	Flute length	Diameter	Overall length	Flute length
mm	mm	mm	inch	inch	inch
0.5	22	6	3/64″	1-3/4″	3/4″
1.0	34	12.0	1/16″	1-7/8″	7/8″
1.5	43	20.0	5/64″	2″	1″
2	49	24.0	3/32″	2-1/4″	1-1/8″
2.5	57	30.0	7/64″	2-5/8″	1-1/2″
3.0	61	33.0	1/8″	2-3/4″	1-5/8″
3.2	65	36.0	9/64″	2-7/8″	1-3/4″
3.5	70	39.0	5/32″	3-1/8″	2″
4.0	75	46.0	11/64″	3-1/4″	2-1/8″
4.2	75	46.0	3/16″	3-1/2″	2-5/16″
4.5	80	47.0	13/64″	3-5/8″	2-7/76″
4.8	86	52.0	7/32″	3-3/4″	2-1/2″
5.0	86	52.0	15/64″	3-7/8″	2-5/8″
5.2	86	52.0	1/4″	4″	2-3/4″
5.5	93	57.0	17/67″	4-1/8″	2-7/8″
6.0	93	57.0	9/32″	4-1/4″	2-15/16″
6.5	101	63.0	19/64″	4-3/8″	3-1/16″
7.0	109	69.0	5/16″	4-1/2″	3-3/16″
7.5	109	69.0	21/64″	4-5/8″	3-5/16″
8.0	117	75.0	11/31″	4-3/4″	3-7/16″
8.5	117	75.0	23/64″	4-7/8″	3-1/2″
9.0	125	81.0	3/8″	5″	3-5/8″
9.5	125	81.0	25/64″	5-1/8″	3-3/4″
10.0	133	87.0	13/32″	5-1/4″	3-7/8″
10.5	133	87.0	27/64″	5-3/8″	3-15/16″
11.0	142	94.0	7/16″	5-1/2″	4-1/16″
11.5	142	94.0	29/64″	5-5/8″	4-3/16″
12.0	151	101	15/32″	5-3/4″	4-5/16″
12.5	151	101	31/64″	5-7/8″	4-3/8″
13.0	151	101	17/32″	6-5/8″	4-13/16″
13.5	160	108	35/64″	6-5/8″	4-13/16″
14.0	160	108	9/64″	6-5/8″	4-13/16″
14.5	169	114	37/64″	6-5/8″	4-13/16″
15.0	169	114	19/32″	7-1/8″	5-13/16″
15.5	178	120	39/64″	7-1/8″	5-13/16″
16.0	178	120	5/8″	7-1/8″	5-13/16″
16.5	184	125	41/64″	7-1/8″	5-13/16″
17.0	184	125	21/32″	7-1/8″	5-13/16″
17.5	191	130	43/64″	7-5/8″	5-5/8″
18.0	191	130	11/16″	7-5/8″	5-5/8″
18.5	198	135
19.0	198	135
19.5	205	140
20.0	205	140