With Hand Tap Finisher DIN 352 HSS-G - UNC 3" x 4 you create a thread interface that must assemble without force. Preparation of the hole or blank and steady alignment are the practical checkpoints for repeatable threads.
UNC designates a Unified coarse inch thread, often found in maintenance of imported machinery and assemblies. DIN 352 indicates the referenced standard family or tool standard named in the product designation. HSS-G denotes a ground high speed steel tool, suitable for repeatable threading work with proper lubrication.
Note Clean threads and tools before use, apply suitable lubrication for cutting operations, and stop if resistance rises sharply.
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| Type of thread | Unified coarse thread |
|---|---|
| Standard | DIN 352 |
| Material | HSS-G |
| Tolerance | 2B |
| Size | UNC 3" x 4 |
| Overall length (L1) | 260 mm |
| Thread length (L2) | 80 mm |
| Core hole diameter (D1) | 70.0 mm |
| Shank diameter (D2) | 50.0 mm |
| Drive connector | 39.0 mm |
| Item number | 23378-3 |
| Type of flute | straight fluted |
| Application | for through and blind holes |
| Thread standard | ANSI B 1.1 |









