ISO 1479 ST5.5×25 Hex Head Tapping Screw4 combinations of material, property class and finish supplied in this size.
- Standard
- ISO 1479 · 2011
- Thread
- ST5.5 · pitch 1.8 mm
- Length under head
- 25 mm · 24.2–25.8 mm to ISO 1479 product grade A
- Drive
- 8 mm spanner · e 8.71 mm
- Head height
- 4.1 mm
- Weight
- 5.98 kg per 1 000 pieces · Theoretical, from nominal geometry — confirm before ordering167 pieces per kg
- Also named
- GB/T 5285
Supplied to ISO 1479 ST5.5×25 — the figures shown here match GB/T 5285. All 2 record the same figures in this size. Compared on the columns shown here only — product grade, tolerance class, length range, material and property-class references are set by each standard separately. We produce to whichever one your drawing calls out. Compare all sizes →
Order ST5.5×25
Set a quantity on as many rows as you need. Not listed? We make to your drawing — send it with the enquiry.
Every standard listed here records the same figures at ST5.5×25. Your choice is carried into the inquiry and the quotation.
| Material | Class | Finish | Quantity | Net weight |
|---|---|---|---|---|
| Carbon Steel | — | Zinc Plated | — | |
| Carbon Steel | — | Dacromet | — | |
| Stainless Steel | — | Passivated | — | |
| Stainless Steel | — | Plain | — |
Dimensions at ST5.5×25
one row per dimension| Dimension | ISO 1479Current | GB/T 5285Current |
|---|---|---|
| Thread PitchP (mm) | 1.8 | 1.8 |
| Thread Runout (max)a (mm) | 1.8 | 1.8 |
| Width Across Flats (max)s (mm) | 8 | 8 |
| Width Across Flats (min)s min (mm) | 7.78 | 7.78 |
| Width Across Corners (min)e (mm) | 8.71 | 8.71 |
| Nominal Head Heightk (mm) | 4.1 | 4.1 |
| Head Height (min)k (mm) | 3.6 | 3.6 |
| Radius (min)r (mm) | 0.25 | 0.25 |
| Point Length — C (ref.)y (mm) | 5 | 5 |
| Point Length — F (ref.)y (mm) | 3.6 | 3.6 |
| Point Length — R (ref.)y (mm) | 4.3 | 4.3 |
Plating adds thickness — state the finish on the order.
Other lengths in ST5.5
All sizes →| Size | kg per 1 000 pieces | |
|---|---|---|
| ST5.5×19 | 4.94 | open |
| ST5.5×22 | 5.46 | open |
| ST5.5×25 | 5.98 | this page |
| ST5.5×32 | 7.19 | open |
| ST5.5×38 | 8.23 | open |
ST5.5 x 13ST5.5 x 16ST5.5 x 19ST5.5 x 22ST5.5 x 32ST5.5 x 38ST5.5 x 45ST5.5 x 50