HSS blue ring ISO (BLT) metric coarse oxidised spiral flute taps are made with a strong high speed steel with a black oxide finish for deep blind holes with reduced wear and improved heat resistance.

Features and Benefits
• High speed steel construction
• Black oxide finish for reduced wear and improved heat resistance

Specification
• For deep blind holes
• Helix angle 45°
• BTL - Biteless taper
• Taper lead to DIN form C (2 x P to 3 x P)
• Tapping tolerance to 6H
• DIN 371/376

Typical Applications
• Tapping
• Steel
• Stainless steel
• Cast iron