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OSG Spiral-Flute STI Tap, 7/8"-14 UNF, H4 / 2B-3B, 4 Flute - Spiral-Flute STI Taps for Multiple Materials
OSGSpiral-Flute STI Taps for Multiple Materials

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

OSG Spiral-Flute STI Taps for Multiple Materials.

SKU 3G-OTH-281103

Brand
OSG
Item
Spiral-Flute STI Tap, 7/8"-14 UNF, H4 / 2B-3B, 4 Flute
Category
Spiral-Flute STI Taps for Multiple Materials
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

OSG
Manufacturer Part Number
31503901

Technical Documents

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

Product Description

OSG Spiral-Flute STI Taps for Multiple Materials.

Frequently Asked Questions

What is an OSG Screw Thread Insert STI Tap used for?

An OSG Screw Thread Insert STI Tap cuts internal threads in multiple materials to accept helical wire thread inserts. It is commonly used in aerospace, automotive, and general manufacturing to repair or reinforce tapped holes in aluminum, steel, and cast iron.

What are the specifications of the OSG 31503901 STI Tap?

The OSG 31503901 is a spiral-flute STI tap with a 7/8"-14 UNF thread, H4 / 2B-3B tolerance, and 4 flutes. It is designed for threading holes that will receive screw thread inserts, providing accurate thread class control in multiple materials.

Where to buy OSG STI Taps worldwide?

3G Electric supplies OSG STI Taps like the 31503901 to customers worldwide. We handle full logistics, customs clearance, and delivery to your facility. Contact us for pricing and lead time on this spiral-flute tap for thread insert applications.

How to select the correct STI tap size for a thread insert?

Select an STI tap that matches the thread insert's nominal size and pitch, such as 7/8"-14 UNF. The tap tolerance (e.g., H4) must align with the required thread class (2B-3B). Always verify the insert manufacturer's recommended tap drill size and depth.

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 sti 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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Compatible alternatives & equivalents

Cross-referenced by specification & description
This OSG spiral-flute STI tap is designed for cutting internal threads in multiple materials prior to installing screw thread inserts. The 4-flute design with spiral flutes facilitates efficient chip evacuation. Thread size is 7/8"-14 UNF with H4 / 2B-3B tolerance. Manufacturer part number 31503908
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This OSG spiral-flute STI tap is designed for cutting internal threads in multiple materials prior to installing screw thread inserts. The 4-flute design with spiral flutes facilitates efficient chip evacuation. Thread size is 7/8"-14 UNF with H4 / 2B-3B tolerance. Manufacturer part number 31503908
Spiral-flute STI tap for cutting internal threads in multiple materials to accept screw thread inserts. Features a 7/8"-14 UNF thread size, H3 / 2B-3B tolerance, and 4-flute design. Suitable for applications requiring strong, replaceable threads in softer base materials
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Spiral-flute STI tap for cutting internal threads in multiple materials to accept screw thread inserts. Features a 7/8"-14 UNF thread size, H3 / 2B-3B tolerance, and 4-flute design. Suitable for applications requiring strong, replaceable threads in softer base materials
This spiral-flute STI tap cuts internal threads for helical wire thread inserts in multiple materials. It features a 7/8"-14 UNF thread, H3 / 2B-3B tolerance, and 4 flutes for chip evacuation in blind-hole applications. Used in aerospace, automotive, and general manufacturing for repairing or reinforcing tapped holes in aluminum, steel, and cast iron
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This spiral-flute STI tap cuts internal threads for helical wire thread inserts in multiple materials. It features a 7/8"-14 UNF thread, H3 / 2B-3B tolerance, and 4 flutes for chip evacuation in blind-hole applications. Used in aerospace, automotive, and general manufacturing for repairing or reinforcing tapped holes in aluminum, steel, and cast iron
Spiral-flute STI tap for cutting internal threads in multiple materials to accept screw thread inserts. Thread size 1"-12 UNF, tolerance H4 / 2B-3B, 4-flute design. Suitable for general manufacturing applications requiring replaceable threads
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Spiral-flute STI tap for cutting internal threads in multiple materials to accept screw thread inserts. Thread size 1"-12 UNF, tolerance H4 / 2B-3B, 4-flute design. Suitable for general manufacturing applications requiring replaceable threads
This spiral-flute STI tap is designed for cutting internal threads in multiple materials prior to installing screw thread inserts. The 1"-12 UNF thread size with H4 / 2B-3B tolerance ensures proper fit for insert installation. The 4-flute design aids chip evacuation. Typical applications include thread repair and reinforcement in general manufacturing
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This spiral-flute STI tap is designed for cutting internal threads in multiple materials prior to installing screw thread inserts. The 1"-12 UNF thread size with H4 / 2B-3B tolerance ensures proper fit for insert installation. The 4-flute design aids chip evacuation. Typical applications include thread repair and reinforcement in general manufacturing
This spiral-flute STI tap is designed for cutting internal threads in multiple materials prior to installing helical wire thread inserts. With a 3/4"-16 UNF thread size and H4 tolerance, it accommodates 2B or 3B class threads. The 4-flute spiral flute design aids chip evacuation in through-hole and blind-hole applications
OSG
This spiral-flute STI tap is designed for cutting internal threads in multiple materials prior to installing helical wire thread inserts. With a 3/4"-16 UNF thread size and H4 tolerance, it accommodates 2B or 3B class threads. The 4-flute spiral flute design aids chip evacuation in through-hole and blind-hole applications

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Spiral-flute STI tap for cutting internal threads to accept helical wire thread inserts. Designed for multiple materials including aluminum, steel, and cast iron. Features 3/8"-24 UNF thread, H2 / 2B-3B tolerance, and 3 flutes. Used in applications requiring thread repair or reinforcement
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