Mechanical properties, corrosion behaviour and the full dimensional range for this grade.
A4 Stainless Steel Cross Dowel Furniture Nuts are supplied to ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80. Corrosion behaviour is superior, including marine and chloride environments, the material is largely non-magnetic, and the usable service range is approx. -200 °C to +400 °C, subject to the property class and the joint. In practice this grade is specified for marine, coastal and chemical applications.
Grade
ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80
Corrosion resistance
Superior, including marine and chloride environments
Magnetic response
Largely non-magnetic
Service temperature
approx. -200 °C to +400 °C, subject to the property class and the joint
Property values are typical for the grade. Certified mechanical test data is available on request for production orders.
Hidden Deck Fasteners Sourcing: Manufacturing, Types & Material Compatibility
Cross Dowel Furniture Nuts manufactured in A4 Stainless Steel (ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80) are dimensioned to Trade series (cross dowel nuts). The sections below give the mechanical and physical properties of the grade, its behavior in corrosive and elevated-temperature service, and the full size table.
Why Choose A4 Stainless Steel for Cross Dowel Furniture Nuts
Specified for marine, coastal and chemical applications. For cross dowel furniture nuts, this matters when superior, including marine and chloride environments is the primary requirement.
Mechanical & Physical Properties
Grade designation
ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80
Magnetic response
Largely non-magnetic
Service temperature
approx. -200 °C to +400 °C, subject to the property class and the joint
Corrosion characteristic
Superior, including marine and chloride environments
Corrosion Behavior in Service
A4 (316) adds 2–3% molybdenum to the A2 (304) composition, which dramatically improves resistance to chloride-pitting corrosion. For Cross Dowel Furniture Nuts in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Comparable Grades
For Cross Dowel Furniture Nuts, the alternative stainless grade is A2 (304). A2 (304) covers general indoor and outdoor service. A4 (316) adds molybdenum, which is what buys the chloride resistance for marine and de-icing-salt exposure. Where strength matters more than corrosion, plated alloy steel in class 8.8 or 10.9 is the swap to make.
Using Stainless Fasteners in Aluminum
The galvanic couple here runs the wrong way: aluminum is the less noble metal, so it corrodes and the fastener does not. What governs the rate is the ratio of areas — a large anode and a small cathode is a tolerable combination, the reverse concentrates the attack into thin material around the hole. An isolating washer plus sealant breaks the circuit; where that is impractical, match the fastener to the substrate.
Sizes of Cross Dowel Furniture Nuts Available in A4 Stainless Steel
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
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
Can A4 Stainless Steel replace plated alloy steel structurally?
Only at the standard strength classes — A2-70 / A4-80 are roughly equivalent to class 7 steel; A4-100 reaches class 8.8. For class 10.9 or 12.9 strength, plated alloy steel is required.
Are A4 Stainless Steel Cross Dowel Furniture Nuts magnetic?
A4 Stainless Steel Cross Dowel Furniture Nuts are largely non-magnetic.
What corrosion resistance do A4 Stainless Steel Cross Dowel Furniture Nuts offer?
A4 Stainless Steel Cross Dowel Furniture Nuts provide superior, including marine and chloride environments with a service range of approx. -200 °C to +400 °C, subject to the property class and the joint.
Should I choose A4 Stainless Steel or A2 (304) for Cross Dowel Furniture Nuts?
For Cross Dowel Furniture Nuts, A4 Stainless Steel suits general indoor and outdoor use; A2 (304) is preferred for marine, coastal and chemical environments. Choose by corrosion exposure first.
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.
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