UN Unified U-Type Full Profile Threading Inserts – 22U / 27U / 33U Series
- Product Series: Heavy-Duty UN Unified U-Type laydown threading inserts (Full Profile).
- Coarse Pitch Specialist: Engineered specifically for large American Standard threads ranging from 4.5 TPI down to extra-coarse 2 TPI.
- Massive Stability: Large U-Type format (up to 3/4″ I.C.) allows for deep cuts that standard 16er threading inserts cannot handle.
- Complete Thread Form: Full Profile carbide threading inserts ensure a precise, topped crest for 60° UN, UNC, and UNF threads.
- Versatility: High-performance threading inserts for lathe holders, available in both Right-Hand and left hand thread insert configurations.
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Product Overview
Dominate your heavy-duty threading applications with our UN Unified U-Type laydown threading inserts. While standard tools are limited to fine and medium pitches, these robust carbide threading inserts are designed for the extreme forces required to machine coarse American Unified threads (UN, UNC, UNF).
Featuring a “Full Profile” geometry, these inserts cut the full thread depth and top the crest in a single operation. The U-Type design utilizes a larger insert size to provide the structural integrity needed for 3 TPI or 2 TPI threads—tasks that are impossible for a standard 16er threading insert to perform.
Key Features & Benefits
- Extreme Capability: Extends your machining range to 2 TPI, far beyond the 8 TPI limit of most standard tools.
- Rigid Performance: The large support surface of the U-Type insert eliminates vibration during heavy stock removal.
- Comparison: A standard 16er threading insert (3/8″ I.C.) lacks the size to support coarse threads; our 27U and 33U series are the dedicated solution for these large diameters.
- Directional Options: We stock comprehensive solutions, including left hand thread insert models (e.g., 27U EL 3 UN) for reverse turning or specific setups.
UN Unified U-Type Full Profile Threading Inserts Technical Specifications
| Insert Shape | I.C. | Pitch (mm) | External Model (R/L) | Internal Model (R/L) | L | X | Y |
|---|---|---|---|---|---|---|---|
| U Type | 1/2″ U | 4.5 | 22U ER/L4.5UN | 22U IR/L4.5UN | 22 | E:2.0, N:2.4 | 11 |
| U Type | 1/2″ U | 6 | 22U ER/L4UN | 22U IR/L4UN | 22 | E:2.0, N:2.4 | 11 |
| U Type | 5/8″ U | 8 | 27U ER/L3UN | 27U IR/L3UN | 27 | E:2.5, N:2.7 | 13.7 |
| U Type | 3/4″ U | 12 | 33U ER/L2UN | 33U IR/L2UN | 33 | E:2.8, N:3.6 | E:16.5, N:16.9 |
Machining Guidelines
- Tool Holder Requirement: These are U-Type threading inserts. You must use a compatible U-Type tool holder (22U, 27U, or 33U pocket size). They will not fit standard 16er threading inserts holders.
- Machine Setup: Machining 2 TPI or 3 TPI threads generates massive torque. Ensure your threading inserts for lathe setup is rigid and the workpiece is securely supported.
- Topping: As Full Profile laydown threading inserts, these will finish the thread crest. Ensure pre-turned diameters have sufficient stock (approx. 0.05-0.10mm depending on pitch) for the topping action.
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