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OSG 1/2"-20 UNF General Purpose STI Tap, Bottoming Chamfer, H4 / 2B-3B, 4 Flute - General Purpose STI Taps
OSGGeneral Purpose STI Taps

OSG 1/2"-20 UNF General Purpose STI Tap, Bottoming Chamfer, H4 / 2B-3B, 4 Flute

The OSG Screw Thread Insert STI Tap (SKU 3G-OTH-262027) is a general-purpose STI tap with a straight flute design, sized 1/2"-20 UNF. It features an H4 / 2B-3B tolerance, bottoming chamfer, and 4 flutes (MPN…

SKU 3G-OTH-262027

Brand
OSG
Item
1/2"-20 UNF General Purpose STI Tap, Bottoming Chamfer, H4 / 2B-3B, 4 Flute
Part Number
12601400
Category
General Purpose STI Taps
Available to Order
Also known as:12601400OSG
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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
12601400
Type
H4 / 2B-3B, Bottoming Chamfer
UNSPSC
23153305
Mfr. Model
12601400
Right Hand
threads are the most common and run clockwise, pointing up and to the right.
List Number
126
Class of Fit
2B-3B
Square Width
0.322
Thread Limit
H4
Square Length
0.322
Thread Length
1.153
Drill Bit Size
33/64
Overall Length
3-37/64
Shank Diameter
429/1000
High Speed Steel
taps offer good wear resistance, have some flexibility, and can absorb some shock and vibration.
Number of Flutes
4
Bright (Uncoated)
tools can be resharpened and are a good choice for use on soft materials, such as aluminum and low-carbon steel.

Technical Documents

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

Product Description

The OSG Screw Thread Insert STI Tap (SKU 3G-OTH-262027) is a general-purpose STI tap with a straight flute design, sized 1/2"-20 UNF. It features an H4 / 2B-3B tolerance, bottoming chamfer, and 4 flutes (MPN 12601400). 3G Electric sources this genuine OSG tool as part of our industrial supply across 14 departments, with specialist expertise in combustion, pumps, and controls.

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 Screw Thread Insert STI Tap used for?

An OSG STI tap cuts internal threads for screw thread inserts, commonly used in aerospace, automotive, and general manufacturing to repair or strengthen threads in softer materials like aluminum. The 1/2"-20 UNF bottoming chamfer design allows threading close to the bottom of a blind hole.

What are the specifications of the OSG 12601400 STI Tap?

The OSG 12601400 is a 1/2"-20 UNF straight flute STI tap with a H4 / 2B-3B tolerance, 4 flutes, and a bottoming chamfer. It is designed for general-purpose threading of screw thread inserts. OSG is a leading manufacturer of precision cutting tools.

Where to buy OSG STI Taps worldwide?

3G Electric supplies OSG STI taps like the 12601400 to customers worldwide. We handle full logistics, customs clearance, and delivery to your facility. Contact us for pricing and lead time on this and other OSG tooling across our 14 industrial departments.

How to select the correct STI tap size?

Select an STI tap that matches the screw thread insert's nominal thread size and pitch, such as 1/2"-20 UNF. Ensure the tap tolerance (e.g., H4 / 2B-3B) aligns with the required class of fit. Use a bottoming chamfer for blind holes and a taper chamfer for through holes.

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
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OSG Products

3G Electric supplies OSG general purpose sti taps. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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