Controlling dimensions to Trade series (solderable SMT nuts), with spanner or drive size and tightening torque.
M2.5 Solderable SMT Nuts are dimensioned by Trade series (solderable SMT nuts). The controlling dimensions, tolerance classes and assembly data are tabulated below.
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
M2.5 Solderable SMT Nuts are manufactured to Trade series (solderable SMT nuts). This page lists the controlling dimensions for the M2.5 size together 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.
M2.5 Dimensional Row (Trade series (solderable SMT nuts))
Thread size
Material
Supply
Board installation
Adhesive spot
M2.5
tinned steel
taped and reeled
solder into plated-through or non-plated hole
with or without
Spanner & Drive for M2.5 Solderable SMT Nuts
Drive geometry for M2.5 Solderable SMT Nuts is given by the row above; match the tool to the listed values.
Installation Tips for M2.5 Solderable SMT Nuts
At M2.5 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 M2.5
Pair M2.5 with the matching M2.5 bolt or screw, plus a M2.5 flat washer where required to distribute load on softer materials.
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
Is M2.5 Solderable SMT Nuts suitable for electronics and small mechanisms?
M2.5 Solderable SMT Nuts is in the micro range and is widely used in electronics, instrument enclosures and small precision mechanisms. Watch the over-torque margin — micro joints strip easily.
What's the typical proof load behavior of M2.5 class 8.8?
Micro-thread joints are sensitive to plastic deformation in the first turn under load — use a torque-limiting driver and check the bearing surface deformation on softer mating materials.
What is the height of an M2.5 nut?
The nominal height of a style-1 ISO 4032 M2.5 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×.
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.
Need a fastener quote or a spec sheet?Message our engineers on WhatsApp — send a drawing or DIN number and get pricing back fast.Start WhatsApp Chat →
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