Osg 1400121300 Thread Forming Tap 10-32 Unf Plug Cobalt

Product Description

The OSG 1400121300 is a thread forming tap designed for roll tapping internal threads in a range of metals without cutting or removing material. Manufactured from cobalt high-speed steel with a bright finish, this plug-style tap produces 10-32 UNF right-hand threads to a Class 3B fit at a Thread Limit of H4. The overall length is 2.375 inches with a 4 to 4.5 thread chamfer, making it suited for through-hole applications where clean, strong thread forms are required. It is installed by machinists and tool and die technicians working with CNC and manual tapping equipment.

This tap is rated for through-hole threading in alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum. The cobalt construction provides heat resistance needed when working harder or abrasive materials. With 32 threads per inch and a tapping depth of 0.866 inches, it is a practical choice for production and maintenance machining environments where 10-32 UNF fastener threads are common. It is sold individually with a minimum order quantity of one piece.

Key Features

• Thread forming (roll tap) design displaces material rather than cutting, producing stronger threads with no chips
• Cobalt HSS construction for improved heat and wear resistance in tough materials
• Plug chamfer with 4 to 4.5 chamfered threads for reliable thread lead-in
• Class 3B fit at H4 thread limit for precision thread tolerance
• Right-hand thread direction, 32 TPI, 10-32 UNF specification
• No coolant-through requirement simplifies setup on standard tapping equipment

Compatibility

Designed for through-hole threading in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces requiring 10-32 UNF internal threads.

Installation Notes

Thread forming taps require a specific tap drill size appropriate for the material and desired thread engagement — consult a forming tap drill chart before drilling the pilot hole. Apply cutting fluid or tapping compound rated for the workpiece material, particularly when tapping stainless or alloy steel. Secure the tap in a rigid holder or self-reversing tapping head to maintain axial alignment and prevent tap breakage. Always back the tap out fully to relieve work hardening before re-entering the hole.