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M8 DIN 557 square nut envelope
M8 DIN 557 square nut envelope: 13 × 13 mm square (s), 6.5 mm thick (m), plain Ø8 bore at the thread major; corners are square, so the corner distance is 18.4 mm against the printed e max 18.4; no chamfer or thread
Exact dimensions. True size, no tolerance added. Threads are plain cylinders at the major diameter.
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Dimensions
| thread | M8 |
|---|---|
| P (mm) | 1.25 |
| s (square side) | 13 |
| e max (across corners) | 18.4 |
| m (thickness) | 6.5 |
| mw min | 4.1 |
| dw min | 11.5 |
| CDE F / G / H | 13 / 18.4 / 6.5 |
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Square nuts, DIN 557: M5–M20 width across flats, thickness, corner distance + 8 envelope files: every size, notes, mating features and sources. What are the dimensions of a DIN 557 square nut, and how big a slot does an M6 square nut need?