M30 Hex Nuts with Collar, 1.5d Height dimensions to DIN 6331: width across flats (spanner size) 46 mm, nut height 45 mm, coarse thread pitch 3.5 mm. Tighten to approximately 1443 Nm at property class 8.8 in a dry, as-supplied condition.
- Width across flats (spanner size)
- 46 mm
- Nut height
- 45 mm
- Coarse thread pitch
- 3.5 mm
- Tightening torque (class 8.8)
- 1443 Nm
Figures are nominal values from the governing standard. Confirm against the tolerance class for your application before machining or ordering.
The M30 size of Hex Nuts with Collar, 1.5d Height is dimensioned by DIN 6331. 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.
M30 Dimensional Row (DIN 6331)
| Size | Pitch P (mm) | a (mm) | d1 (mm) | damin (mm) | damax (mm) | Nut height m (mm) | Width across flats s (mm) | Note | Reference standard |
|---|
| M30 | 3.5 | 8 | 58 | 30 | 32.4 | 45 | 46 | | DIN 6331 |
Spanner & Drive for M30 Hex Nuts with Collar, 1.5d Height
Drive geometry for M30 Hex Nuts with Collar, 1.5d Height is given by the row above; match the tool to the listed values.
Tightening Torque for M30
| Class 8.8 (dry, ~µ 0.125) | ≈ 1443 Nm |
|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 2055 Nm |
|---|
| Class 12.9 (dry, ~µ 0.125) | ≈ 2405 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 M30
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 M30 Hex Nuts with Collar, 1.5d Height
- At M30 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 M30
Pair M30 with the matching M30 bolt or screw, plus a M30 flat washer where required to distribute load on softer materials.
Custom manufacturing · Made to drawing
Need hex nuts with collar, 1.5d height in a size this table does not list?
This page covers M30 hex nuts with collar, 1.5d height. 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 M30 Hex Nuts with Collar
Where Hex Nuts with Collar are used, and what decides the specification in each case. Stocked from M6 to M48.
Industries that specify Hex Nuts with Collar
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Machine tools
table clamps and fixtures.
-
Die and mold making
clamping sets that are reused.
-
Presses
tooling fixings under high load.
-
Workholding
T-slot bolt nuts with bearing collars.
-
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.
Typical applications
- clamping repeatedly without thread wear
- bearing on the collar instead of the hex corners
- carrying higher loads than a standard nut
- pairing with T-slot bolts on machine tables
- 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.
- Match the class
- A nut below the bolt property class strips before the bolt reaches its own limit — pair class 8 nuts with 8.8 bolts, class 10 with 10.9.
Where to use something else
- Do not substitute a standard nut on high-cycle clamps; the thread wears and the corners mark the table.
Full application guide: where Hex Nuts with Collar are used, how to specify them, and the cases they are wrong for
