OSG Spiral Point Tap: 5/16"-18 UNC, H3 / 2B-3B, 2 Flute, Bottoming Chamfer
The OSG Spiral Point Tap (5/16"-18 UNC, MPN 1230900) is a general-purpose spiral-point tap with a bottoming chamfer, made from high-speed steel. It features 2 flutes and is rated H3 / 2B-3B for thread class…
SKU 3G-OTH-215173
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Product Description
The OSG Spiral Point Tap (5/16"-18 UNC, MPN 1230900) is a general-purpose spiral-point tap with a bottoming chamfer, made from high-speed steel. It features 2 flutes and is rated H3 / 2B-3B for thread class compatibility.
Frequently Asked Questions
What is the OSG spiral point tap 5/16"-18 UNC used for?
The OSG spiral point tap is used for threading blind or through holes in ferrous and non-ferrous materials. Its spiral point design pushes chips forward, reducing chip clogging and breakage. It is ideal for general-purpose tapping in manufacturing, automotive, and metalworking industries.
What are the specifications of the OSG spiral point tap 5/16"-18 UNC?
This OSG tap has a 5/16"-18 UNC thread size, H3 / 2B-3B tolerance, 2 flutes, and a bottoming chamfer. It is made from high-speed steel (HSS) and is designed for general-purpose tapping. The manufacturer part number is 1230900.
Where to buy OSG spiral point taps in worldwide?
You can source OSG spiral point taps through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide locations. Contact us for availability and lead times on this and other OSG tapping tools.
How to select the correct OSG spiral point tap for my application?
Select the tap based on thread size, pitch, and material. For 5/16"-18 UNC threads in steel or aluminum, this OSG HSS tap with bottoming chamfer works well. Ensure the tap drill size matches the hole and use cutting fluid for best results. Consult OSG's technical data for specific material recommendations.
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3G Electric supplies OSG general purpose spiral-point taps. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.















