M48 Hex Nuts are manufactured to ISO 4032 / ISO 4033. This page lists the controlling dimensions for the M48 size together with the drive and the installation notes for this type.
M48 Dimensional Row (ISO 4032 / ISO 4033)
| Size | Pitch (mm) | Width across flats s (mm) | Width across corners e min (mm) | Nut height m style 1 (mm) | Nut height m style 2 (mm) | Reference standard |
|---|---|---|---|---|---|---|
| M48 | 5.0 | 75.0 | 82.6 | 38.0 | 48.0 | ISO 4032 (Style1) / ISO 4033 (Style2) |
Spanner & Drive for M48 Hex Nuts
M48 Hex Nuts have a width across flats of 75.0 mm — fit a 75.0 mm open-ended spanner or socket. Use a 6-point socket for tight clearances and to reduce rounding; for repeated assembly choose a torque wrench so the joint preload is repeatable.
Common Applications for M48 Hex Nuts
M48 Hex Nuts are commonly specified for structural joints, flange connections and heavy equipment foundations.
Installation Tips for M48 Hex Nuts
- Use a 6-point socket where access allows — 12-point sockets are more prone to rounding the corners on smaller sizes.
- On flanged or serrated variants, do NOT add a separate flat washer — the flange already spreads the load and the washer can defeat the locking serrations.
- At M48 the stretch in the bolt becomes the controlling factor — for critical joints, use angle-controlled or stretch-controlled tightening instead of pure torque.
Mating Parts for M48
Pair M48 with the matching M48 bolt or screw, plus a M48 flat washer where required to distribute load on softer materials.
