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OSG 1/2"-20 UNF Oversized Spiral-Point Tap - Oversized Spiral-Point Taps
OSGOversized Spiral-Point Taps

OSG 1/2"-20 UNF Oversized Spiral-Point Tap

OSG Oversized Spiral-Point Taps.

SKU 3G-OTH-251226

Brand
OSG
Item
1/2"-20 UNF Oversized Spiral-Point Tap
Category
Oversized Spiral-Point Taps
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Local availability & support

Delivery
Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
Payment
Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Technical Specifications

OSG
Manufacturer Part Number
2842901

Technical Documents

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OSG Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

OSG Oversized Spiral-Point Taps.

Frequently Asked Questions

What is the OSG spiral point tap 1/2"-20 UNF used for?

This OSG spiral point tap is designed for through-hole threading in ferrous and non-ferrous materials. Its spiral point pushes chips ahead, reducing clogging. Common applications include automotive, aerospace, and general manufacturing where precise UNF threads are required.

What are the specifications of the OSG 2842901 tap?

The OSG 2842901 is a 1/2"-20 UNF oversized spiral point tap with H11 tolerance for 2B class fit. It has 3 flutes and a plug chamfer. The oversized design compensates for coating or post-treatment buildup. It is made from premium high-speed steel for durability.

Where to buy OSG taps in worldwide?

You can source OSG taps worldwide through 3G Electric, a global industrial equipment distributor since 1990. We handle full logistics, customs clearance, and delivery to your facility. Contact us for availability and lead time on the OSG 2842901 or other OSG tooling.

How to select the correct OSG tap for UNF threads?

Select based on thread size, pitch, and class of fit. For 1/2"-20 UNF 2B, use an H11 limit tap like this OSG model. Consider material hardness and hole type: spiral point taps suit through holes. Oversized taps allow for coating thickness. Always match tap tolerance to the required thread class.

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 oversized spiral-point taps. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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Compatible alternatives & equivalents

Cross-referenced by specification & description
OSG Spiral Point Tap: 1/2"-20 UNF, H11 / 2B, 3 Flute, Plug Chamfer (MPN 2842900)
OSG
OSG Spiral Point Tap: 1/2"-20 UNF, H11 / 2B, 3 Flute, Plug Chamfer (MPN 2842900)
OSG Spiral Point Tap: 1/2"-20 UNF, H11 / 2B, 3 Flute, Plug Chamfer (MPN 2842908)
OSG
OSG Spiral Point Tap: 1/2"-20 UNF, H11 / 2B, 3 Flute, Plug Chamfer (MPN 2842908)
OSG Spiral Point Tap: 7/16"-20 UNF, H11, 3 Flute, Plug Chamfer (MPN 2843008)
OSG
OSG Spiral Point Tap: 7/16"-20 UNF, H11, 3 Flute, Plug Chamfer (MPN 2843008)
OSG Spiral Point Tap: 7/16"-20 UNF, H11, 3 Flute, Plug Chamfer (MPN 2843001)
OSG
OSG Spiral Point Tap: 7/16"-20 UNF, H11, 3 Flute, Plug Chamfer (MPN 2843001)
OSG Spiral Point Tap: 7/16"-20 UNF, H11, 3 Flute, Plug Chamfer (MPN 2843000)
OSG
OSG Spiral Point Tap: 7/16"-20 UNF, H11, 3 Flute, Plug Chamfer (MPN 2843000)
Oversized spiral-point tap for through-hole threading in ferrous and non-ferrous materials. Features a spiral point design that pushes chips forward to reduce clogging and enable faster threading. Thread size 5/16-24 UNF with H11 tolerance, 3 flutes, and plug chamfer. Suitable for applications requiring precise UNF threads with slightly larger pitch diameter
OSG
Oversized spiral-point tap for through-hole threading in ferrous and non-ferrous materials. Features a spiral point design that pushes chips forward to reduce clogging and enable faster threading. Thread size 5/16-24 UNF with H11 tolerance, 3 flutes, and plug chamfer. Suitable for applications requiring precise UNF threads with slightly larger pitch diameter

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This OSG oversized spiral-point tap is designed for through-hole threading in ferrous and non-ferrous materials. It features a 1/2"-13 UNC thread size, 2B+ tolerance class, 3 flutes, and a plug chamfer. Constructed from high-speed steel, the spiral-point design pushes chips ahead to reduce clogging and breakage. Common applications include automotive, aerospace, and general manufacturing where precise UNC threads are required
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This OSG oversized spiral-point tap is designed for threading through-holes in metalwork. It features a 3/4"-10 UNC thread size, 2B+ tolerance class, 3 flutes, and a plug chamfer. Made from high-speed steel (HSS), the spiral-point design pushes chips ahead to reduce clogging and improve thread quality
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