Countersink-Bits, HSS-G, 20,5

• Deburr drilled holes and create a chamfer for screw seating and safer handling of edges.
• Use in metal fabrication and maintenance work when a clean entry is required before tapping or assembly.
• Use to remove raised edges that can affect thread start quality and part handling.
• Process: manual driving or assisted driving depending on your holder and machine setup
• Use: thread cutting, re tapping, and thread cleaning depending on condition

Note Use an appropriate cutting fluid and remove chips regularly to protect the cutting edges.

• Creates a clean chamfer and removes burrs for improved assembly and handling.
• Helps reduce edge deformation that can affect thread starts and fastener seating.
• Compact tool format supports use in hand drills, bit drives, or machine spindles depending on execution.
• Useful as a preparation step in production and maintenance workflows.

• Surface finish can vary with feed and rigidity, especially on thin sheet.
• Not intended for precision countersinking in high volume production lines.

1. Secure the workpiece and ensure the hole is drilled to its intended size and position.
2. Clamp the countersink in your chosen interface so that runout is minimized.
3. Align the tool to the hole axis and start at low feed to establish the chamfer.
4. Increase feed smoothly while monitoring vibration and surface marking.
5. Stop when the chamfer is sufficient for your fastener or deburring requirement.
6. Remove the tool and clean the part to remove chips and burr residue.
7. Inspect the edge and repeat if required for consistent seating.

No bill of materials is available in the provided file for Countersink-Bits, HSS-G, 20,5. Check your order confirmation for the exact included items and quantities.

• Product type: Countersink bit
• Size: 20,5
• Material: HSS-G ground high speed steel

How do you select the correct countersink for your screw head?
You match the countersink angle and the diameter stated in the product name to the fastener and the required seat. You also consider the machine interface so the tool runs true.

What causes chatter marks during countersinking?
Chatter is usually caused by runout, insufficient rigidity, or too aggressive feed. You improve clamping, reduce feed, and keep the tool sharp and clean.

Can you use the countersink on stainless steel?
Depending on execution and cutting edge condition you can countersink stainless steel, but you use appropriate lubrication and controlled feed to limit heat and work hardening.

How do you avoid burrs at the exit of thin sheet?
You support the sheet, control feed, and stop as soon as the chamfer is sufficient. Excessive penetration can deform the edge.

How do you maintain the tool after use?
You remove chips, wipe the tool clean, and apply light corrosion protection before storage.

Where can you find additional technical information in the catalog?
You can use the catalog for product families, standards references, and selection guidance. VD 23 catalog as PDF

Is 20,5 fixed or part of a variant range?
20,5 is part of the product designation in the provided data. You match it to your drawing and confirm that pitch and thread system also match your requirement.