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OSG Spiral Flute Tap: 7/8"-14 UNF, H4 / 2B-3B, 4 Flute - General Purpose Spiral-Flute Taps
OSGGeneral Purpose Spiral-Flute Taps

OSG Spiral Flute Tap: 7/8"-14 UNF, H4 / 2B-3B, 4 Flute

The OSG Spiral Flute Tap (7/8"-14 UNF, MPN 2939200) is a general-purpose spiral-flute tap with an H4 / 2B-3B tolerance, 4 flutes, and a modified bottoming chamfer. This product is designed for threading applications…

SKU 3G-OTH-230226

Brand
OSG
Item
Spiral Flute Tap: 7/8"-14 UNF, H4 / 2B-3B, 4 Flute
Category
General Purpose Spiral-Flute Taps
Available to Order
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Technical specs
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Local availability & support — the Philippines

Delivery
5–8 business days door-to-door; Bureau of Customs clearance typically 2–4 business days.
Payment
Invoicing in PHP or USD. Bank transfer and corporate PO accepted.
Ships to
Manila, Quezon City, Cebu, Davao, Batangas

Technical Specifications

OSG
Manufacturer Part Number
2939200
Type
H4 / 2B-3B, Modified Bottoming Chamfer
Flute
4

Technical Documents

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

Product Description

The OSG Spiral Flute Tap (7/8"-14 UNF, MPN 2939200) is a general-purpose spiral-flute tap with an H4 / 2B-3B tolerance, 4 flutes, and a modified bottoming chamfer. This product is designed for threading applications requiring precise internal threads.

Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.

Frequently Asked Questions

What is the OSG spiral flute tap 2939200 used for?

The OSG spiral flute tap 2939200 is designed for threading blind holes in materials such as steel and stainless steel. Its spiral flute design evacuates chips upward, preventing clogging. It is commonly used in automotive, aerospace, and general manufacturing applications where precise UNF threads are required.

What are the specifications of the OSG spiral flute tap 7/8"-14 UNF?

This OSG tap has a 7/8"-14 UNF thread size, H4 / 2B-3B tolerance, 4 flutes, and a modified bottoming chamfer. The H4 limit ensures precise thread fit for 2B-3B classes. The manufacturer part number is 2939200. It is a general-purpose spiral-flute tap for blind-hole threading.

Where to buy the OSG spiral flute tap 2939200 worldwide?

3G Electric supplies the OSG spiral flute tap 2939200 worldwide. As a global industrial distributor, we handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time. We source and deliver this tap to support your manufacturing operations.

How to select the correct OSG spiral flute tap for UNF threads?

To select the correct OSG spiral flute tap, match the thread size (e.g., 7/8"-14 UNF) and tolerance class (H4 / 2B-3B) to your application. For blind holes, choose a modified bottoming chamfer. Ensure the tap material suits your workpiece. OSG taps are designed for precision threading in steel and alloys.

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 general purpose spiral-flute 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 Flute Tap: 5/8"-18 UNF, H3 / 2B-3B, 4 Flute, Modified Bottoming Chamfer (MPN 2933408)
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OSG Spiral Flute Tap: 5/8"-18 UNF, H3 / 2B-3B, 4 Flute, Modified Bottoming Chamfer (MPN 2933408)
OSG Spiral Flute Tap: 1/4"-28 UNF, H4 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 2935400)
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OSG Spiral Flute Tap: 1/4"-28 UNF, H4 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 2935400)
OSG Spiral Flute Tap: 7/8"-14 UNF, H4 / 2B-3B, 4 Flute, Modified Bottoming Chamfer (MPN 2939208)
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OSG Spiral Flute Tap: 7/8"-14 UNF, H4 / 2B-3B, 4 Flute, Modified Bottoming Chamfer (MPN 2939208)
OSG Spiral Flute Tap: 1/4"-28 UNF, H4 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 2935408)
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OSG Spiral Flute Tap: 1/4"-28 UNF, H4 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 2935408)
This OSG spiral-flute tap is designed for threading blind holes in ferrous and non-ferrous materials. It features a modified bottoming chamfer and 4 flutes to efficiently evacuate chips upward. The H3 / 2B-3B tolerance class ensures precise UNF threads. Suitable for general manufacturing applications requiring blind-hole threading
OSG
This OSG spiral-flute tap is designed for threading blind holes in ferrous and non-ferrous materials. It features a modified bottoming chamfer and 4 flutes to efficiently evacuate chips upward. The H3 / 2B-3B tolerance class ensures precise UNF threads. Suitable for general manufacturing applications requiring blind-hole threading
OSG Spiral Flute Tap: 3/4"-16 UNF, H3 / 2B-3B, 4 Flute, Modified Bottoming Chamfer (MPN 2933808)
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OSG Spiral Flute Tap: 3/4"-16 UNF, H3 / 2B-3B, 4 Flute, Modified Bottoming Chamfer (MPN 2933808)

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