HSS Lathe Tool Bits CHUOKU Grades 1900, 2500 & Co.8 — Round/Square/Flat
Description
HSS Lathe Tool Bits CHUOKU Grades 1900, 2500 & Co.8 — Round/Square/Flat
CHUOKU HSS lathe tool bits come in three grades — 1900, 2500, and Co.8 (cobalt) — to grind your own cutting geometry to suit the job. The bits are tough, crack-resistant, and heat-resistant, available in round, square, and flat cross-sections for turning mild steel, cast iron, brass, and aluminium. Supplied by BOWMAP Industry & Tooling, Samut Prakan.
Specifications
| Brand | CHUOKU |
|---|---|
| Type | HSS lathe tool bit (grind to shape) |
| The | 1900 (high-speed) · 2500 · Co.8 = HSS 8% cobalt (confirmed from 'HSS CO.8%' image) |
| Cross-section | Round · Square · Flat (inch sizes — from images) |
| Suitable for | Mild steel, cast iron, brass, bronze, aluminium |
| Property | Tough, crack-resistant, heat-resistant |
| Round bar sizes | Ø13–32 mm × 200 mm (metric) plus inch sizes |
| Square bar sizes | 1/8"–1" × 8" (all grades) · grade 2500 also 15/18/25 mm × 200 mm |
| Flat bar sizes | Thickness 1/8"–1/2" × width 3/16"–1" × length 8" |
| Quality | Equivalent to ASAB tool steel |
Use cases
- Grinding facing, turning, and grooving tools to suit the drawing
- Turning mild steel and cast iron in general machine shops
- Turning brass and aluminium needing specific rake angles
- Work on older or less rigid lathes needing a tough, chip-resistant bit
- Grinding custom-shaped tool tips for maintenance work
Compatibility
Choose the grade and cross-section for the job, then grind the rake, clearance, and cutting angles per the chart for the material (e.g. for mild steel: 8° front clearance, 10° side clearance). Use a tool holder matched to the cross-section and grind a sharp edge before each use.
Availability
In stock at the BOWMAP warehouse in Samut Prakan, ready for same-day pickup or next-day delivery across Bangkok and the surrounding provinces. Contact us for bulk pricing on large orders.
Related products
- Lathe tool holder
- Carbide turning tools CHUOKU
- CHUOKU carbide tips U20C/H03C/K20/P20
- MACAW grinding stone
FAQ
What is the difference between grades 1900, 2500 and Co.8?
All three are high-speed steels for grinding your own tool bits. Generally the cobalt grade (Co.8) resists heat and holds hardness at high temperature better, suiting heavy work and harder steels, while 1900 and 2500 differ in composition and the balance of toughness vs hardness. Choose by material and how heavy the cut is.
Why grind tool angles, and which angles matter?
Tool angles determine how well the bit cuts and how long it stays sharp. The key ones are rake (helps chips flow), clearance (stops the tool rubbing the work), and the cutting-edge angle. Each material needs different angles — e.g. aluminium uses a large rake (~35–40°) while brass uses ~0° rake.
Do HSS tool bits need a holder?
It depends on size. Small-section HSS bits usually need a tool holder to clamp them rigidly and set the edge height on centre, while larger sections can sometimes be clamped directly in the tool post. Match the holder to the bit's cross-section.
