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OSG Spiral Flute Tap: 7/8"-9 UNC, H4 / 2B-3B, 4 Flute - Spiral-Flute Taps for Steel & Stainless Steel
OSGSpiral-Flute Taps for Steel & Stainless Steel

OSG Spiral Flute Tap: 7/8"-9 UNC, H4 / 2B-3B, 4 Flute

The OSG Spiral Flute Tap (7/8"-9 UNC, MPN 1645078094) is a 4-flute, modified-bottoming-chamfer tap with H4 / 2B-3B tolerance, designed for threading steel and stainless steel. 3G Electric interprets your demand for…

SKU 3G-OTH-218980

Brand
OSG
Item
Spiral Flute Tap: 7/8"-9 UNC, H4 / 2B-3B, 4 Flute
Category
Spiral-Flute Taps for Steel & Stainless Steel
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Technical Specifications

OSG
Manufacturer Part Number
1645078094
Type
H4 / 2B-3B, Modified Bottoming Chamfer
Flute
4
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OSG Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The OSG Spiral Flute Tap (7/8"-9 UNC, MPN 1645078094) is a 4-flute, modified-bottoming-chamfer tap with H4 / 2B-3B tolerance, designed for threading steel and stainless steel. 3G Electric interprets your demand for this OEM-specified tool, sourcing it across our 14 industrial departments and backing it with specialist depth in controls and pumps.

Frequently Asked Questions

What is the OSG spiral flute tap 7/8"-9 UNC used for?

This OSG spiral flute tap is designed for threading blind holes in steel and stainless steel. Its modified bottoming chamfer and 4-flute design efficiently evacuate chips upward, making it ideal for high-production tapping in automotive, aerospace, and general manufacturing applications.

What are the specifications of the OSG 7/8"-9 UNC spiral flute tap?

The OSG tap has a 7/8"-9 UNC thread size, H4 / 2B-3B tolerance, 4 flutes, and a modified bottoming chamfer. It is designed for steel and stainless steel. The manufacturer part number is 1645078094. OSG is the OEM brand for this precision threading tool.

Where to buy OSG taps in worldwide?

3G Electric supplies and delivers OSG taps worldwide. As a global industrial solutions provider, we handle full logistics and customs clearance to ensure your order reaches any international destination. Contact us for availability and lead time on this OSG spiral flute tap.

How to select the right spiral flute tap for steel?

For steel, choose a spiral flute tap with a modified bottoming chamfer like this OSG 7/8"-9 UNC model. Ensure the tap has sufficient flute count (4 flutes) for chip evacuation and the correct tolerance (H4 / 2B-3B) for your thread class. Always match tap material to workpiece hardness.

Used in

Common applications for OSG
Automotive engine block production — OSG micro drill bits for oil gallery and coolant passage drilling in cast iron
Medical device manufacturing — OSG micro drill bits for drilling bone screw pilot holes in stainless steel implants
Aerospace component machining — OSG micro drill bits for fastener holes in titanium alloy structural parts
Mold and die making — OSG micro drill bits for cooling channel drilling in hardened tool steel (HRC 45-50)
Electronics enclosure fabrication — OSG micro drill bits for precision holes in aluminum alloy housings (with appropriate coating selection)
General engineering job shops — OSG micro drill bits for small-diameter hole drilling in mild steel and alloy steel parts

OSG Products

3G Electric supplies OSG spiral-flute taps for steel & stainless steel. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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