OSG Screw Thread Insert STI Tap: Straight Fute, 1/2"-20 UNF, H4 / 2B-3B, 4 Flute
The OSG Screw Thread Insert STI Tap (SKU 33ZK33) 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…
SKU 3G-OTH-262027
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Product Description
The OSG Screw Thread Insert STI Tap (SKU 33ZK33) 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.
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 OSGOSG 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.
