OSG STRAIGHT FLUTE

OSG Straight Flute taps are designed for threading in aluminum, hardened steel, and other non-ferrous metals. The carbide construction provides hardness and wear resistance, making them effective in materials that generate abrasive chips or require high cutting speeds. For aluminum, the taps are optimized to reduce built-up edge and improve thread finish. For hardened steel, the carbide grade and geometry help maintain cutting edge integrity under higher cutting forces.

The coolant-through design in these OSG taps features internal passages that deliver cutting fluid directly to the cutting zone. This improves heat dissipation, reduces friction, and flushes chips away from the thread profile. In automated or high-speed tapping operations, this can extend tool life, improve thread surface finish, and reduce the risk of tap breakage. It is particularly beneficial in blind-hole applications where chip evacuation is critical.

These designations refer to the pitch diameter tolerance of the tap. H3, H4, and H5 indicate progressively larger pitch diameter limits relative to the basic thread profile. H3 is a tighter tolerance, typically used for producing threads in the 2B-3B range for UNC/UNF standards. H4 and H5 provide more clearance, often used for materials that may cause thread shrinkage or for applications requiring easier assembly. The choice depends on the desired thread fit and workpiece material.

Yes, these taps have a bottoming chamfer, which allows threading close to the bottom of a blind hole. The straight flute design is effective in blind holes when chip evacuation is managed through coolant flow or peck tapping cycles. For deeper blind holes, spiral-flute taps may be preferred for chip removal, but the coolant-through feature in these OSG taps helps mitigate chip packing.

UNC (Unified Coarse) and UNF (Unified Fine) are thread series under the Unified Thread Standard. UNC has fewer threads per inch for a given diameter, providing faster threading and better resistance to stripping in softer materials. UNF has more threads per inch, offering finer adjustment and higher tensile strength in threaded joints. OSG Straight Flute taps are available in both series to match application requirements.

Yes — 3G Electric (S) Pte. Ltd. supplies OSG STRAIGHT FLUTE products. We stock the OSG STRAIGHT FLUTE catalog and supply genuine factory-original products with full manufacturer warranty and technical support.