Yato YT-39820 Long Metal Drill Bits, 5-Piece Set (3-8 mm)
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Availability:In stock (ready to ship)
Shipping time:immediately
Shipping cost:From 3.28 Euro
catalog number:YT-39820
Availability:
EAN code:5906083078729
Product condition:New, originally packaged
Guarantee:24 months of consumer protection
Weight:0,16 kg
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Yato YT-39820 long metal drill bits - 5-piece set (3-8mm)
A set of five long twist drills made from HSS 4341 high-speed steel, intended for drilling into metals. Diameters from 3 to 8 mm, overall length from 150 to 240 mm. The 118° split point tip provides accurate centring without pre-punching. Compliant with DIN 1869.
Technical characteristics of HSS metal drill bits
HSS 4341 high-speed steel
An alloy containing tungsten, molybdenum and cobalt. A hardness of 63-65 HRC provides resistance to abrasion when drilling structural steel, stainless steel and cast iron. It retains cutting edge sharpness at temperatures of up to 600°C.
118° split point tip
Cross grinding removes the central section of the chisel edge, so the drill centres itself without any need for pre-punching. The 118° angle is the standard for most metals and offers a balance between durability and cutting efficiency.
Extended working length
Manufactured to DIN 1869, these drill bits have a greater overall length than standard DIN 338 drill bits. This makes it possible to drill deep holes and to work in hard-to-reach places, for example through tubular profiles or thick walls.
DIN 1869 standard
A German standard defining dimensional tolerances, geometry and quality parameters for long twist drills. It guarantees dimensional repeatability and compatibility with drill chucks.
Technical specification of the YT-39820 set
| Model | YT-39820 |
| Manufacturer | Yato |
| Material | HSS 4341 (high-speed steel) |
| Number of pieces in the set | 5 |
| Drill bit diameters | 3 mm, 4 mm, 5 mm, 6 mm, 8 mm |
| Tip type | Split point (cross-ground) |
| Point angle | 118° |
| Standard | DIN 1869 |
| Shank type | Straight shank (for drill chucks) |
Dimensions of the individual drill bits
| Diameter (mm) | Flute length (mm) | Overall length (mm) |
| 3 | 100 | 150 |
| 4 | 120 | 175 |
| 5 | 135 | 195 |
| 6 | 140 | 205 |
| 8 | 165 | 240 |
Applications of long metal drill bits
- Drilling deep through holes in steel and aluminium profiles
- Assembling metal structures that require drilling through thick walls
- Electrical and plumbing installations in steel frames and posts
- Work in mechanical workshops machining long components
- Drilling through multi-layer sheet metal and welded structures
- Repairs to industrial machinery and equipment with limited access
- Installing ventilation and air-conditioning systems in metal profiles
- Metalwork requiring accurate drilling at considerable depth
Materials machined with HSS 4341 drill bits
Ferrous metals
Non-alloy and low-alloy structural steel (up to 900 N/mm²), stainless steel, tool steel, grey and spheroidal graphite cast iron. When drilling harder steels, the use of cutting fluid emulsions is recommended.
Non-ferrous metals
Aluminium and aluminium alloys, copper, brass, bronze, zinc. With aluminium, take care with the rotational speed to avoid clogging the flutes.
Drilling parameters
For structural steel: cutting speed 20-30 m/min, feed 0.1-0.2 mm/rev. For aluminium: speed 80-120 m/min, feed 0.15-0.3 mm/rev. The rotational speed should be calculated using the formula n = (1000 × v) / (π × d), where v is the cutting speed and d is the drill bit diameter.
Using and maintaining twist drills
Before drilling begins, mark the centre of the hole with a centre punch or a centre drill. The split point tip reduces, but does not entirely remove, the need for pre-punching when drilling hard steels. The drill bit should be clamped in the chuck to a depth of at least 2/3 of the shank length to prevent it being pulled out during work.
When drilling deep holes, the drill bit must be withdrawn regularly in order to clear swarf from the flutes. A build-up of swarf causes overheating and loss of cutting edge sharpness. When drilling through, reduce the feed just before breakthrough to avoid tearing out the material.
HSS drill bits require cooling when machining steel. Synthetic emulsions, cutting oils or, in a domestic setting, ordinary soapy water can be used. Aluminium and brass can be drilled dry, although cooling extends tool life.
Once work is finished, clean the drill bits of swarf and dirt, dry them and protect them against corrosion with a thin film of oil. Storing them in the original packaging or a case protects the cutting edges against mechanical damage.
Sharpening drill bits
HSS drill bits can be sharpened repeatedly on a grinder while maintaining a 118° point angle and edge symmetry. Incorrect sharpening causes runout, overheating and uneven holes. In professional settings, the use of a drill sharpening machine with angle control is recommended.
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