SPI 34-411-9 5/8-11 UNC-2B Go/No-Go Thread Plug Gauge
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The SPI 34-411-9 is a double-ended Go/No-Go thread plug gauge for inspecting 5/8-11 UNC-2B inch internal threads per ASME/ANSI B1.2 standards. The Go member verifies that the threaded hole meets minimum material condition (the thread must accept the Go gauge), while the Not Go member confirms the thread does not exceed maximum material condition, ensuring the hole falls within Class 2B tolerance limits. The gauge features a black oxide finished steel handle with hardened and ground threaded members, providing wear resistance for production inspection environments. This unit is marked with the inventory/calibration identifier TG-OSF-4 and is new-other condition — unused but without full original documentation; it is supplied in its original SPI clear plastic protective case with label confirming part number 34-411-9 and 75889618 as the SPI catalog/UPC reference.
Product Specifications
| Brand | SPI |
| Manufacturer Part Number | 34-411-9 |
| Thread Size | 5/8-11 |
| Thread Series | UNC (Unified National Coarse) |
| Thread Class | 2B (internal) |
| Gauge Type | Double-ended Go/No-Go thread plug gauge |
| Nominal Diameter | 5/8 in (0.625 in) |
| Threads Per Inch | 11 TPI |
| Applicable Standard | ASME/ANSI B1.2 |
| Handle Finish | Black oxide |
| Gauge Member Material | Hardened steel |
| Condition | New — other (unused, original case) |
| Internal Calibration ID | TG-OSF-4 |
| SPI Catalog Reference | 75889618 |