GUHRING 4289 HSS-E Cobalt Tap with 40° Helix and TiN Coating for Blind Hole Threading

The GUHRING Series 4289 HSS-E TiN Coated 8-Pitch Tap is a high-performance spiral flute machine tap engineered by Germany brand GUHRING, compliant with dual DIN/ANSI industrial standards. It adopts a 40° high helix spiral flute structure with Form C 2–3 thread chamfer, 2B thread fit tolerance and TiN golden coating, specially designed for blind hole tapping of American standard 8-pitch UNC/UNF thread parts, delivering excellent chip evacuation, wear resistance and stable internal thread precision on carbon steel and alloy steel.

• Brand: GUHRING (Germany professional threading tool manufacturer)
• Series Model: 4289
• Core Specification: 8-Pitch American standard thread tap
• Tool Material: HSS-E (5% Cobalt high speed steel, high toughness & heat resistance)
• Surface Coating: TiN (Titanium Nitride golden coating)
• Flute Style: 40° High Angle Spiral Flute (upward chip discharge for blind holes)
• Chamfer Type: Form C, 2–3 thread chamfer (semi-bottoming tap)
• Thread Fit Class: 2B (ANSI standard internal thread medium tolerance)
• Executive Standard: DIN / ANSI dual certification
• Processing Target: Blind hole internal tapping, external coolant machining

• Carbon steel (1018, 1045, A3 free cutting steel, ≤ HRC 30)
• Low & medium alloy structural steel (4140, 40Cr, pre-hardened mold steel)
• General mechanical carbon steel components for oil & gas, machinery industry

• Blind hole internal thread tapping for inch 8-pitch UNC/UNF standard parts
• CNC machining center, lathe automated tapping mass production
• Automotive, hydraulic, oil pipeline standard threaded fittings
• Medium-load continuous tapping, long service life requirement scenarios

• 40° high helix spiral flute: Chips spiral upward out of blind holes, avoid chip jamming and thread damage
• HSS-E cobalt substrate: Superior red hardness, withstand high cutting temperature during high-speed tapping
• TiN golden coating: Reduce friction coefficient, improve wear resistance, extend tool service life by 30%+ vs uncoated taps
• Form C 2–3 thread chamfer: Balanced penetration performance, suitable for semi-bottom blind hole threading
• ANSI 2B precision tolerance: Stable internal thread size, meet American standard assembly matching requirement
• Germany original GUHRING precise grinding, consistent dimensional accuracy across batches