OSG SPIRAL FLUTE

OSG Spiral Flute taps are designed for threading in a range of materials including steel, stainless steel, aluminum, and other non-ferrous alloys. The specific coating and substrate—such as V-coated powdered metal or carbide—determine the optimal material application. For example, coolant-through spiral-flute taps for aluminum are engineered to handle the chip formation and heat generation typical in aluminum machining. Always refer to the manufacturer's recommendations for the exact material compatibility of each tap model.

These tolerance classes define the thread fit and pitch diameter limits. H2 / 2B-3B is an inch-system designation: H2 indicates the tap's pitch diameter tolerance range, while 2B-3B refers to the class of fit for the internal thread (2B is a medium fit, 3B is a tighter fit). D6 / 4H-6H is a metric designation: D6 specifies the tap's pitch diameter tolerance, and 4H-6H indicates the internal thread tolerance class (4H is a tighter fit, 6H is a standard fit). These markings ensure the tap produces threads that meet specified dimensional standards.

Spiral-point taps have a straight flute with a pointed cutting edge that pushes chips forward, making them ideal for through-hole threading. Spiral-flute taps have helical flutes that pull chips backward, which is better for blind holes where chip evacuation is critical. The OSG Spiral Flute product family includes both types: spiral-point extension taps for multiple materials and spiral-flute taps for aluminum. The choice depends on the hole type and material being threaded.

Yes, OSG offers coolant-through spiral-flute taps, particularly in the aluminum-specific line. These taps have internal coolant channels that deliver cutting fluid directly to the cutting edge, improving chip evacuation and reducing heat buildup. This design is beneficial for high-speed threading operations in aluminum and other materials where thermal management is critical. The coolant-through taps are typically made of carbide for increased wear resistance.

OSG Spiral Flute taps come with several chamfer types: plug chamfer (typically 3-5 threads of chamfer), bottoming chamfer (1-2 threads), and modified bottoming chamfer. Plug chamfers are used for general-purpose threading, while bottoming chamfers allow threading close to the bottom of a blind hole. Modified bottoming chamfers offer a compromise between chip load and thread depth. The specific chamfer is indicated in the product specifications, such as 'Plug Chamfer' or 'Bottoming Chamfer'.

The V coating on OSG Spiral Flute taps is a type of vapor-deposited coating, often titanium-based, that reduces friction and increases surface hardness. This coating improves tool life by resisting wear and galling, especially in abrasive materials like stainless steel. It also allows for higher cutting speeds and better chip flow. The V coating is applied to powdered metal taps, which offer a balance of toughness and wear resistance for general-purpose threading.