You use Hand Tap Taper ISO 529 Form A HSS-G - UNF 1" x 12 to generate threads during manufacturing, maintenance, or repair work. Correct results depend on matching the tool to the specified thread designation and keeping the tool aligned to the axis.
UNF means Unified National Fine, an inch based fine thread series used where higher thread engagement is specified. ISO 529 indicates the referenced standard family or tool standard named in the product designation. HSS-G indicates high speed steel with a ground execution, typically chosen for controlled cutting and consistent geometry.
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 Fine Thread |
|---|---|
| Standard | ISO 529 |
| Form | Form A |
| Material | HSS-G |
| Tolerance | 2B |
| Size | UNF 1" x 12 |
| Overall length (L1) | 120 mm |
| Thread length (L2) | 35 mm |
| Core hole diameter (D1) | 23.25 mm |
| Shank diameter (D2) | 18.0 mm |
| Drive connector | 14.0 mm |
| Item number | 83438-1 |
| Type of flute | straight fluted |
| Application | for through holes |
| Thread standard | ANSI B 1.1 |









