M5 Nyloc Lock Nuts dimensions to DIN 985 / ISO 7040: width across flats (spanner size) 8 mm, nut height 5 mm, coarse thread pitch 0.8 mm. Tighten to approximately 5.9 Nm at property class 8.8 in a dry, as-supplied condition.
- Width across flats (spanner size)
- 8 mm
- Nut height
- 5 mm
- Coarse thread pitch
- 0.8 mm
- Tightening torque (class 8.8)
- 5.9 Nm
Figures are nominal values from the governing standard. Confirm against the tolerance class for your application before machining or ordering.
Dimensional data for M5 Nyloc Lock Nuts to DIN 985 / ISO 7040, with 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.
M5 Dimensional Row (DIN 985 / ISO 7040)
| Size | Pitch (mm) | Width across flats s (mm) | Width across corners e min (mm) | Total height m (mm) | Metal height (mm) | Reference standard | Notes |
|---|
| M5 | 0.8 | 8.0 | 8.79 | 5.0 | 3.7 | DIN 985 / ISO 7040 | With nylon insert, single use |
Spanner & Drive for M5 Nyloc Lock Nuts
Drive geometry for M5 Nyloc Lock Nuts is given by the row above; match the tool to the listed values.
Tightening Torque for M5
| Class 8.8 (dry, ~µ 0.125) | ≈ 5.9 Nm |
|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 8.7 Nm |
|---|
| Class 12.9 (dry, ~µ 0.125) | ≈ 10 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 M5
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 M5 Nyloc Lock Nuts
- At M5 the joint is sensitive to over-torque — use a torque-limiting driver and check the head doesn't bury into a softer counterpart.
Mating Parts for M5
Pair M5 with the matching M5 bolt or screw, plus a M5 flat washer where required to distribute load on softer materials.
Custom manufacturing · Made to drawing
Need nyloc lock nuts in a size this table does not list?
This page covers M5 nyloc lock nuts. Height and across-flats are the two most often changed — a thinner nut for clearance, a larger hex for a tool that is already on the line. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
Custom nut manufacturingSend a drawing
Applications & Industries for M5 Nyloc Lock Nuts
Nyloc Lock Nuts are bought for a small number of well-defined jobs. These are the ones we ship them for. Stocked from M3 to M36.
Industries that specify Nyloc Lock Nuts
-
Steel fabrication
Bolted structural and frame connections.
-
Automotive & transport
Vibration-prone joints where the locking type is specified on the drawing.
-
Maintenance & MRO
Replacements matched to the existing bolt class, thread and finish.
-
Building services
Threaded rod, channel and suspension assemblies.
-
Machine building & OEM
The clamping counter-face on studs and bolts throughout an assembly.
Typical applications
- locking an adjustment so it cannot drift
- joints re-torqued at a service interval
- completing a bolted joint on a stud, rod or bolt
Service conditions to specify against
- Marine and coastal
- Available in A4 (316) stainless for chloride exposure — coastal structures, pool halls, water treatment and deck hardware, where A2 will eventually pit.
- High load
- Supplied in ISO 898-1 property classes, so the joint can be designed to a stated proof load and tightened to a calculated torque rather than by feel.
- Temperature ceiling
- The polymer feature sets the limit, not the steel: nylon softens above roughly 120 °C, so an all-metal locking type is the correct choice on hot assemblies.
- Vibration
- Specified where cyclic load would loosen a plain nut or screw — rotating plant, rail, mobile equipment and anything that is not re-torqued in service.
Full application guide: where Nyloc Lock Nuts are used, how to specify them, and the cases they are wrong for
