Controlling dimensions to Trade series (cross dowel nuts), with spanner or drive size and tightening torque.
M6 Cross Dowel Furniture Nuts dimensions to Trade series (cross dowel nuts): coarse thread pitch 1 mm. Tighten to approximately 10 Nm at property class 8.8 in a dry, as-supplied condition.
Coarse thread pitch
1 mm
Tightening torque (class 8.8)
10 Nm
Figures are nominal values from the governing standard. Confirm against the tolerance class for your application before machining or ordering.
Hidden Deck Fasteners Sourcing: Manufacturing, Types & Material Compatibility
The M6 size of Cross Dowel Furniture Nuts is dimensioned by Trade series (cross dowel nuts). 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.
M6 Dimensional Row (Trade series (cross dowel nuts))
Thread size
Diameter options (mm)
Length options (mm)
Body form
Material options
M6
8 or 9
19
cross-drilled perpendicular barrel
galvanized steel / 1.4305 stainless steel
Spanner & Drive for M6 Cross Dowel Furniture Nuts
Drive geometry for M6 Cross Dowel Furniture Nuts is given by the row above; match the tool to the listed values.
Tightening Torque for M6
Class 8.8 (dry, ~µ 0.125)
≈ 10 Nm
Class 10.9 (dry, ~µ 0.125)
≈ 14 Nm
Class 12.9 (dry, ~µ 0.125)
≈ 17 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 M6
Tensile stress area As (ISO 898-1)
20.1 mm²
Proof load, class 8.8
12 kN
Proof load, class 10.9
17 kN
Proof load, class 12.9
19 kN
Min. ultimate tensile, class 8.8
16 kN
Proof load = stress area × proof stress per ISO 898-1. Design joints so the working preload stays below the proof load of the selected class.
Mating Parts for M6
Pair M6 with the matching M6 bolt or screw, plus a M6 flat washer where required to distribute load on softer materials.
When to Step Up or Down from M6
When the joint preload approaches the proof load of M6 class 8.8, step up to M8 class 8.8 (or move to M6 class 10.9). When the joint is over-specified, M5 often saves weight and cost without losing the safety margin.
Technical Drawing
Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.
Sends the selected values to the quote form below.
Request a Quote
The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.
Dimensions & Specifications (Trade series (cross dowel nuts))
Thread size
Diameter options (mm)
Length options (mm)
Body form
Material options
M4
6
15
cross-drilled perpendicular barrel
galvanized steel / 1.4305 stainless steel
M5
8
18
cross-drilled perpendicular barrel
galvanized steel / 1.4305 stainless steel
M6
8 or 9
19
cross-drilled perpendicular barrel
galvanized steel / 1.4305 stainless steel
M8
10~12
22~60
cross-drilled perpendicular barrel
galvanized steel / 1.4305 stainless steel
M10
12~16
20~50
cross-drilled perpendicular barrel
galvanized steel / 1.4305 stainless steel
Materials & Grades
Select a material class to see the grades we supply it in. Each designation is listed with its ISO/EN, AISI/SAE, JIS and GB equivalents.
Machine building & OEMThe clamping counter-face on studs and bolts throughout an assembly.
Steel fabricationBolted structural and frame connections.
Typical applications
aligning a cross-drilled barrel with a mating bolt
choosing M4 through M10 and the barrel diameter
selecting a length that fits the blind bore
using galvanized steel or 1.4305 stainless
locking an adjustment so it cannot drift
joints re-torqued at a service interval
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.
Exterior structural
Hot-dip galvanised options for external steelwork; allow for the thicker coating in the mating thread.
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 drill the cross bore from the visible face without a positioning jig; misalignment prevents the bolt from entering.
This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.
01
Cold heading
Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail.
Head dimensions and under-head radius checked at set-up and per shift.
02
Thread rolling
Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch.
Go / no-go ring gauges to ISO 965 tolerance class 6g.
03
Heat treatment
Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it.
Core hardness and tensile tested per lot to ISO 898-1.
04
Surface treatment
Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list.
Coating thickness and neutral salt spray hours to ISO 9227.
Frequently Asked Questions
What clearance and tapping drill suit M6?
Use a 6.6 mm clearance hole (ISO 273 medium) for through-fixing, or a 5 mm tapping drill for a coarse M6 thread.
What is the height of an M6 nut?
The nominal height of a style-1 ISO 4032 M6 nut is in the spec table on this page. Style-2 (thick) is approximately 1.1× this height; thin (ISO 4035 / DIN 439) is approximately 0.5×.
What is the coarse-thread pitch of M6 for Cross Dowel Furniture Nuts?
For M6 the standard coarse pitch is 1 mm — this is the value used for Cross Dowel Furniture Nuts.
How do I request a quotation?
Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day.
This website uses only necessary and functional cookies to operate, secure, and improve basic website performance.
We do not use advertising cookies, Google Analytics, or cross-site tracking technologies.
Privacy Policy
