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OSG Extension Tap: 1/4"-20 UNC, H5 / 2B-3B, 2 Flute - Spiral-Flute Extension Taps for Multiple Materials
OSGSpiral-Flute Extension Taps for Multiple Materials

OSG Extension Tap: 1/4"-20 UNC, H5 / 2B-3B, 2 Flute

OSG Spiral-Flute Extension Taps for Multiple Materials.

SKU 3G-OTH-311757

Brand
OSG
Item
Extension Tap: 1/4"-20 UNC, H5 / 2B-3B, 2 Flute
Category
Spiral-Flute Extension Taps for Multiple Materials
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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
1652501708

Technical Documents

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

Product Description

OSG Spiral-Flute Extension Taps for Multiple Materials.

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 an OSG extension tap used for?

An OSG extension tap is used to thread blind or deep holes where standard taps cannot reach. The 1/4"-20 UNC spiral-flute design evacuates chips upward, making it ideal for production threading in steel, stainless, and aluminum across machining, automotive, and general manufacturing applications.

What are the specifications of the OSG 1/4"-20 UNC extension tap?

This OSG extension tap has a 1/4"-20 UNC thread, H5 tolerance for 2B-3B class fit, 2-flute spiral-flute design, and modified bottoming chamfer. The MPN is 1652501708. It is designed for threading multiple materials including steel and aluminum in deep or blind-hole applications.

Where to buy OSG extension taps worldwide?

3G Electric supplies OSG extension taps worldwide, handling full logistics and customs clearance. As a global industrial sourcing partner, we provide genuine OSG cutting tools like the 1/4"-20 UNC spiral-flute tap (MPN 1652501708) to customers in machining, automotive, and manufacturing sectors across all regions.

How to select the right OSG extension tap for deep-hole threading?

Select an OSG extension tap based on thread size (e.g., 1/4"-20 UNC), hole depth, material, and chamfer type. For blind holes, use a modified bottoming chamfer. Spiral-flute taps like this OSG model are best for chip evacuation in deep holes. Always match tap tolerance (H5) to the required thread class (2B-3B).

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 extension taps for multiple materials. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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Cross-referenced by specification & description
OSG Extension Tap: 3/8"-16 UNC, H5 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1652502508)
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OSG Extension Tap: 9/16"-12 UNC, H5 / 2B-3B, 3 Flute, Modified Bottoming Chamfer (MPN 1652503708)
This OSG spiral-flute extension tap is designed for threading blind holes in multiple materials. The spiral-flute design evacuates chips upward, facilitating deep-hole tapping. It features a modified bottoming chamfer for threading close to the hole bottom, with H5 tolerance for class 2B-3B fit
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This OSG spiral-flute extension tap is designed for threading blind holes in multiple materials. The spiral-flute design evacuates chips upward, facilitating deep-hole tapping. It features a modified bottoming chamfer for threading close to the hole bottom, with H5 tolerance for class 2B-3B fit
This spiral-flute extension tap from OSG is designed for threading holes in multiple materials. With a 1/2"-20 UNF thread size, H5 tolerance for 2B-3B class fit, 3 flutes, and a modified bottoming chamfer, it provides precise thread cutting in extended-reach applications where standard taps cannot access
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This spiral-flute extension tap from OSG is designed for threading holes in multiple materials. With a 1/2"-20 UNF thread size, H5 tolerance for 2B-3B class fit, 3 flutes, and a modified bottoming chamfer, it provides precise thread cutting in extended-reach applications where standard taps cannot access
Spiral-flute extension tap for threading blind holes in multiple materials. The spiral-flute design evacuates chips upward, enabling deep-hole tapping. Modified bottoming chamfer allows threading close to the hole bottom. Thread size: 5/8"-18 UNF, H5 tolerance for class 2B-3B fit, 3 flutes
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Spiral-flute extension tap for threading blind holes in multiple materials. The spiral-flute design evacuates chips upward, enabling deep-hole tapping. Modified bottoming chamfer allows threading close to the hole bottom. Thread size: 5/8"-18 UNF, H5 tolerance for class 2B-3B fit, 3 flutes
OSG Extension Tap: 3/4"-16 UNF, H5 / 2B-3B, 4 Flute, Modified Bottoming Chamfer (MPN 1652504708)
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OSG Extension Tap: 3/4"-16 UNF, H5 / 2B-3B, 4 Flute, Modified Bottoming Chamfer (MPN 1652504708)

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