OSG Screw Thread Insert STI Tap: Spiral Fute, 3/8"-16 UNC, H4 / 2B-3B
SKU 3G-OTH-281119
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Frequently Asked Questions
What is the OSG Screw Thread Insert STI Tap used for?
The OSG Screw Thread Insert STI Tap is used to cut internal threads in multiple materials for installing screw thread inserts. It is commonly applied in aerospace, automotive, and general manufacturing where thread repair or reinforcement is needed. The spiral-flute design efficiently evacuates chips, making it suitable for blind-hole threading.
What are the specifications of the OSG STI Tap 31501308?
The OSG STI Tap 31501308 has a thread size of 3/8"-16 UNC, a thread limit of H4 / 2B-3B, and 3 flutes with a spiral-flute design. It is manufactured by OSG under part number 31501308. This tap is designed for cutting threads in multiple materials to accommodate screw thread inserts.
Where to buy OSG STI Tap 31501308 worldwide?
You can source the OSG STI Tap 31501308 worldwide through 3G Electric, a global industrial equipment distributor established in 1990. We handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time; we provide reliable sourcing for this OSG spiral-flute STI tap.
How to select the correct OSG STI tap for thread inserts?
To select the correct OSG STI tap, match the thread size and pitch to your insert requirements—for example, 3/8"-16 UNC. Verify the thread limit class (e.g., H4 / 2B-3B) to ensure proper fit. Choose spiral-flute taps for blind holes to aid chip evacuation. Always consult the material being tapped for optimal performance.
Used in
Common applications for OSGOSG 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.















