Dimensional data for M1.0 / M1.2 / M1.4 / M1.6 / M2 / M2.5 / M3 / M3.5 / M4 / M5 Trilobular Metal Thread-Forming Screws to Trade series (trilobular thread-forming screws), 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.
Drive geometry for M1.0 / M1.2 / M1.4 / M1.6 / M2 / M2.5 / M3 / M3.5 / M4 / M5 Trilobular Metal Thread-Forming Screws is given by the row above; match the tool to the listed values.
At M1.0 / M1.2 / M1.4 / M1.6 / M2 / M2.5 / M3 / M3.5 / M4 / M5 the joint is sensitive to over-torque — use a torque-limiting driver and check the head doesn't bury into a softer counterpart.
For M1.0 / M1.2 / M1.4 / M1.6 / M2 / M2.5 / M3 / M3.5 / M4 / M5, pair with a M1.0 / M1.2 / M1.4 / M1.6 / M2 / M2.5 / M3 / M3.5 / M4 / M5 hex nut (ISO 4032 / DIN 934) and, where used, a M1.0 / M1.2 / M1.4 / M1.6 / M2 / M2.5 / M3 / M3.5 / M4 / M5 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
Technical Drawing
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Dimensions & Specifications (Trade series (trilobular thread-forming screws))
Trilobular Metal Thread-Forming Screws are bought for a small number of well-defined jobs. These are the ones we ship them for. Stocked from M1.0 / M1.2 / M1.4 / M1.6 / M2 / M2.5 / M3 / M3.5 / M4 / M5 to M6 / M8 / M10 / M12 / M14 / M16.
Industries that specify Trilobular Metal Thread-Forming Screws
Machine buildingMetric M1–M16 sizes cover small instrument through larger assemblies.
Automotive assemblyTrilobular screws form a thread in drilled or punched holes without a loose nut.
Appliance productionCase-hardened thread-formers suit high-volume sheet and cast-metal assembly.
Electrical equipmentCoatings and profile reduce installation friction in thin metal.
Roofing & claddingProfiled sheet and rainscreen fixed to purlins and rails.
Volume assemblyAppliance and consumer products driven at speed with power tools.
Typical applications
checking the tapered lead and coating for the process
forming a mating thread as the trilobular screw is driven
matching pitch and lead to the parent material
using case-hardened steel for the forming operation
forming a thread directly in sheet, board or timber
fixing where there is no access to add a nut behind the panel
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.
Pilot hole
Selection is really a hole-size decision: too small and the screw snaps or splits the material, too large and it strips. The size is stated per row.
Where to use something else
Do not treat a thread-forming screw as a replacement for a pre-tapped machine screw without checking installation torque and parent material.
Not for a joint that will be dismantled and reassembled repeatedly in the same hole — use an insert or a rivet nut instead.
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's the typical proof load behavior of M1.0 / M1.2 / M1.4 / M1.6 / M2 / M2.5 / M3 / M3.5 / M4 / M5 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.
Is M1.0 / M1.2 / M1.4 / M1.6 / M2 / M2.5 / M3 / M3.5 / M4 / M5 Trilobular Metal Thread-Forming Screws suitable for electronics and small mechanisms?
M1.0 / M1.2 / M1.4 / M1.6 / M2 / M2.5 / M3 / M3.5 / M4 / M5 Trilobular Metal Thread-Forming Screws 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.
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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