Mechanical properties, corrosion behaviour and the full dimensional range for this grade.
A2 Stainless Steel Solderable SMT Nuts are supplied to ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70. Corrosion behaviour is good general corrosion resistance, 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 the most common stainless group for indoor and general outdoor fasteners.
Grade
ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70
Corrosion resistance
Good general corrosion resistance
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
Material specification page for solderable smt nuts in A2 Stainless Steel. Covers the grade designation (ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70), corrosion and magnetic behavior, comparable grades and their trade-offs, and the sizes available to Trade series (solderable SMT nuts).
Why Choose A2 Stainless Steel for Solderable SMT Nuts
The most common stainless group for indoor and general outdoor fasteners. For solderable smt nuts, this matters when good general corrosion resistance is the primary requirement.
Mechanical & Physical Properties
Grade designation
ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70
Magnetic response
Largely non-magnetic
Service temperature
approx. -200 °C to +400 °C, subject to the property class and the joint
Corrosion characteristic
Good general corrosion resistance
Corrosion Behavior in Service
A2 (304) gives excellent atmospheric and most-water corrosion resistance and is the most common stainless for Solderable SMT Nuts in indoor and general outdoor service. In chloride-bearing environments (marine air, road salt, swimming pools) consider stepping up to A4 (316).
Comparable Grades
For Solderable SMT Nuts, the alternative stainless grade is A4 (316). Choose A2 (304) for general use and A4 (316) wherever chlorides are present; the molybdenum in A4 is the whole difference. Remember that stainless is the corrosion answer, not the strength answer — for load, look at class 8.8 or 10.9 instead.
Using Stainless Fasteners in Aluminum
Expect the aluminum to corrode, not the fastener — stainless sits higher in the galvanic series, so the aluminum is the one that gives up material. A small fastener in a thick section spreads the loss over a large area and is usually fine; a large fastener in thin sheet concentrates it and is not. Keep water out of the joint, or isolate the two metals with a nylon or coated washer and a sealant.
Sizes of Solderable SMT Nuts Available in A2 Stainless Steel
Thread size
Material
Supply
Board installation
Adhesive spot
M2
tinned steel
taped and reeled
solder into plated-through or non-plated hole
with or without
M2.5
tinned steel
taped and reeled
solder into plated-through or non-plated hole
with or without
M3
tinned steel
taped and reeled
solder into plated-through or non-plated hole
with or without
M4
tinned steel
taped and reeled
solder into plated-through or non-plated hole
with or without
M5
tinned steel
taped and reeled
solder into plated-through or non-plated hole
with or without
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 (solderable SMT nuts))
Thread size
Material
Supply
Board installation
Adhesive spot
M2
tinned steel
taped and reeled
solder into plated-through or non-plated hole
with or without
M2.5
tinned steel
taped and reeled
solder into plated-through or non-plated hole
with or without
M3
tinned steel
taped and reeled
solder into plated-through or non-plated hole
with or without
M4
tinned steel
taped and reeled
solder into plated-through or non-plated hole
with or without
M5
tinned steel
taped and reeled
solder into plated-through or non-plated hole
with or without
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.
Control electronicsM2–M5 threads secure shields and board-mounted brackets.
Instrument modulesOptional adhesive spots help hold the part during soldering.
Machine building & OEMThe clamping counter-face on studs and bolts throughout an assembly.
Steel fabricationBolted structural and frame connections.
Typical applications
soldering a fine threaded nut into a plated or non-plated board hole
selecting M2 through M5 for the mating screw
using taped-and-reeled placement in production
choosing with or without an adhesive spot
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 size the nut from the screw alone; the board hole, solder land and reflow process must accept the part.
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
Are A2 Stainless Steel Solderable SMT Nuts magnetic?
A2 Stainless Steel Solderable SMT Nuts are largely non-magnetic.
What corrosion resistance do A2 Stainless Steel Solderable SMT Nuts offer?
A2 Stainless Steel Solderable SMT Nuts provide good general corrosion resistance with a service range of approx. -200 °C to +400 °C, subject to the property class and the joint.
Should I choose A2 Stainless Steel or A4 (316) for Solderable SMT Nuts?
For Solderable SMT Nuts, A2 Stainless Steel suits general indoor and outdoor use; A4 (316) is preferred for marine, coastal and chemical environments. Choose by corrosion exposure first.
Can A2 Stainless Steel Solderable SMT Nuts gall during installation?
Yes — stainless on stainless is prone to thread galling under load, especially at smaller sizes. Use an anti-galling lubricant or wax thread compound, and slow the tightening rate where possible.
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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