Jis B 1188 Pdf Page

| Thread size (d) | Pitch (P) | Head diameter (dk) min ~ max | Head height (k) | Hexalobular drive size (internal) | |----------------|-----------|------------------------------|----------------|-------------------------------------| | M3 | 0.5 | 5.5 – 5.88 mm | 3.0 mm | T10 | | M5 | 0.8 | 8.5 – 8.88 mm | 5.0 mm | T25 | | M8 | 1.25 | 13.0 – 13.5 mm | 8.0 mm | T40 |

Full dimensional tables are available only in the official standard.

| Property class | Tensile strength (MPa) | Hardness (HRC) | |----------------|------------------------|----------------| | 8.8 | 800 min | 22–32 | | 10.9 | 1040 min | 32–39 | | 12.9 | 1220 min | 39–44 | jis b 1188 pdf

To help you verify if you have the right PDF, here is a sample comparison:

| Parameter | JIS B 1188 (2003) | ISO 1207 | Old JIS (pre-1980) | | :--- | :--- | :--- | :--- | | Head diameter (M3) | 5.5 mm – 5.8 mm | 5.5 mm – 5.8 mm | 5.2 mm – 5.5 mm | | Head height (M3) | 1.65 mm – 1.85 mm | 1.65 mm – 1.85 mm | 1.5 mm – 1.7 mm | | Slot width (M3) | 0.8 mm – 1.0 mm | 0.8 mm – 1.0 mm | 0.6 mm – 0.8 mm | | Countersunk angle | 90° | 90° (ISO 2009/2010) | 82° or 90° (mixed) | | Thread size (d) | Pitch (P) |

Notice that modern JIS B 1188 matches ISO for pan heads, but countersunk heads still have subtle differences in head depth. Only the official PDF reveals these tolerances.

Once you locate a legitimate jis b 1188 pdf, here is the exact data you can expect to find. The document is typically 15-20 pages long and includes: Full dimensional tables are available only in the

Unlike JIS B 1180, B 1188 does not require high tensile grades. The PDF will reference JIS B 1051 for mechanical properties of screws up to property class 4.8 (soft steel, low carbon).

A common point of confusion when searching for jis b 1188 pdf is mixing it up with JIS B 1180.

Why does this matter for your PDF search?
Many third-party websites incorrectly label one standard as the other. If you are working on a transmission or bridge, you need JIS B 1180. If you are repairing a Japanese rice cooker or a toy, you need JIS B 1188.