The M8X1 size of Fine-Thread Hex Flange Nuts is dimensioned by ISO 10663. The table below gives the dimensional row from the standard, followed by the drive and the installation notes for this type.
Values are taken from the governing standard rather than from a general machine-thread table, because this type is not selected on one.
M8X1 Dimensional Row (ISO 10663)
| Size | Pitch P (mm) | c_min (mm) | d_a_max (mm) | d_a_min (mm) | d_c_max (mm) | d_w_min (mm) | Width across corners e (mm) | Nut height m (mm) | m_min (mm) | m_w_min (mm) | Width across flats s (mm) | s_min (mm) | r_max (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M8x1 | 1 | 1.2 | 8.75 | 8 | 17.9 | 15.8 | 14.38 | 8 | 7.64 | 4.6 | 13 | 12.73 | 0.5 | ISO 10663 |
Spanner & Drive for M8X1 Fine-Thread Hex Flange Nuts
M8X1 Fine-Thread Hex Flange Nuts have a width across flats of 13 mm — fit a 13 mm open-ended spanner or socket. Prefer a 6-point socket over a 12-point: it loads the corners of the 13 mm hex far less, which matters on plated heads and on anything that will be re-used. Set preload with a torque wrench rather than by arm.
Tightening Torque for M8X1
| Class 8.8 (dry, ~µ 0.125) | ≈ 26 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 38 Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 45 Nm |
Indicative dry-joint values. Lubrication can lower the required torque by 15–25%. Always confirm against the joint design, especially when going up a strength class.
Proof Load & Strength for M8X1
Nuts are graded to ISO 898-2 by the proof load the nut itself will hold (classes 04, 05, 5, 6, 8, 10 and 12), not by the 8.8 / 10.9 / 12.9 scale used for bolts. A class-8 nut is the correct mate for a class-8.8 bolt, and the joint is designed on the bolt, so no bolt-tension figure is quoted here.
Installation Tips for M8X1 Fine-Thread Hex Flange Nuts
- Use a 6-point socket where access allows — 12-point sockets are more prone to rounding the corners on smaller sizes.
- A flanged head is its own washer. Adding a flat one under it lifts the serrations clear of the surface they are meant to bite, which is the whole locking mechanism gone.
- At M8X1 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 M8X1
Pair M8X1 with the matching M8X1 bolt or screw, plus a M8X1 flat washer where required to distribute load on softer materials.
Custom manufacturing · Made to drawing
Need fine-thread hex flange nuts in a size this table does not list?
This page covers M8X1 fine-thread hex flange nuts. Thread size is the obvious variable and rarely the interesting one — height for clearance, across-flats for the tool already in the cell, and the locking feature for the vibration actually present. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
