Micro Screws · M0.8 – M6
Precoated Screws
Screws with a factory-applied locking or sealing element, so the assembly line receives a ready-to-drive fastener with no liquid adhesive and no cure time.
Nylon patchMicro-encapsulated3M tape
Micro Screws
Machine Thread Micro Screws
M0.5 to M6 machine screws for threaded metal and plastic assemblies
M0.5 – M6 · Micro Screws Overview
Machine Thread Micro Screws from M0.5 – M6
Machine thread micro screws are the backbone of miniature assemblies. They join metal inserts, tapped housings and stacked components where the thread must engage smoothly, hold preload and survive repeated service. At diameters below M2, a few micrometres of thread error is enough to cause cross-threading, cam-out or a dropped clamp load — so the process window has to be controlled from the wire rod onward.
We produce machine thread micro screws by cold heading, then roll the thread rather than cut it. Rolling reforms the grain structure along the thread flank instead of severing it, which raises fatigue strength and leaves a smoother flank finish. Threads are gauged to ISO 68-1 / ISO 965-2 Class 6g, with 6f available for applications that need a tighter fit. Every lot is optically sorted for head cracks, incomplete threads and dimension drift before packing.
Diameter range
M0.5 – M6
Thread standard
ISO 68-1 / ISO 965-2, Class 6g (6f on request)
Thread form
Rolled, coarse and fine pitch
Length range
1.2 mm – 60 mm
Length tolerance
±0.05 mm (< 3 mm) / ±0.10 mm (3 – 10 mm)
Head diameter tolerance
±0.03 mm
Design intent
What this product solves
Six engineering decisions that separate a micro fastener that works from one that merely fits the drawing.
Rolled threads, not cut
Thread rolling follows the grain flow of the wire, improving fatigue life and producing a flank finish that engages cleanly in tapped aluminium and brass.
Concentric head to shank
Head-to-shank concentricity is held within 0.03 mm on micro sizes, so automated drivers pick the screw cleanly and torque is applied without wobble.
Clean drive recess
Punch geometry is dressed on a fixed interval and verified by gauge and vision, preventing the burrs that cause bit cam-out at M1 and below.
Length control from 1.2 mm
Short lengths down to 1.2 mm are held at ±0.05 mm, which matters when a screw must sit flush inside a 1.5 mm wall section.
Material range for every housing
Austenitic stainless for corrosion, martensitic stainless for hardness, alloy steel for 8.8–12.9 property classes, brass and titanium where weight or conductivity matters.
Traceable by lot
Each carton carries a lot code linked to wire heat number, forging date, heat treatment batch, coating batch and inspection record.
Technical data
Common machine thread sizes — coarse pitch, tapping drill and drive recommendation
Reference data for design and sourcing. For a specific part, the drawing governs — these tables are the starting point for a joint review.
| Size | Pitch (mm) | Tapping drill Ø (mm) | Close fit | Typical drive | Max torque (N·m, 8.8) |
|---|---|---|---|---|---|
| M0.5 | 0.125 | 0.35 | 0.45 | Slotted 0.8 | 0.02 |
| M0.6 | 0.15 | 0.45 | 0.55 | Phillips 000 | 0.03 |
| M0.8 | 0.20 | 0.65 | 0.75 | Phillips 000 / T1 | 0.06 |
| M1.0 | 0.25 | 0.75 | 0.85 | Phillips 000 / T2 | 0.10 |
| M1.2 | 0.25 | 0.95 | 1.05 | Phillips 0 / T3 | 0.15 |
| M1.4 | 0.30 | 1.10 | 1.20 | Phillips 0 / T3 | 0.22 |
| M1.6 | 0.35 | 1.25 | 1.35 | Phillips 0 / T4 | 0.35 |
| M2.0 | 0.40 | 1.60 | 1.70 | Phillips 1 / T5 | 0.60 |
| M2.5 | 0.45 | 2.05 | 2.10 | Phillips 1 / T6 | 1.20 |
| M3.0 | 0.50 | 2.50 | 2.60 | Phillips 1 / T8 | 2.10 |
| M4.0 | 0.70 | 3.30 | 3.40 | Phillips 2 / T20 | 4.80 |
| M5.0 | 0.80 | 4.20 | 4.30 | Phillips 2 / T25 | 9.50 |
| M6.0 | 1.00 | 5.00 | 5.20 | Phillips 3 / T30 | 16.5 |
Values are typical for the stated material and finish. Actual performance depends on the mating material, engagement length and assembly torque. Confirm with a sample test before design freeze.
Options
Heads, drives, materials and finishes
Mix these within one part number family. Where a combination is not manufacturable at your tolerance, we will say so at quotation rather than after the first lot.
Head styles
- Pan head — General purpose, largest bearing area under the head
- Flat / countersunk — Flush seating in 90° or 120° countersinks
- Oval countersunk — Flush with a slightly domed top
- Cheese / fillister — Tall cylindrical head for deep recesses
- Binding head — Undercut head for binding two thin parts
- Hex washer — Integrated washer face for load spreading
Drive types
- Phillips (JIS cross)
- Pozidriv
- Torx
- Torx Plus
- Hex socket
- Slotted
- Tri-wing
Materials
- SUS304 / SUS316 austenitic stainless
- SUS410 / SUS430 martensitic and ferritic stainless
- SWCH18A – SWCH22A low-carbon steel
- SCM435 alloy steel for 10.9 / 12.9
- C3604 brass
- Grade 5 titanium (Ti-6Al-4V)
Finishes
- Zinc trivalent blue / clear
- Zinc-nickel alloy
- Electroless nickel
- Black oxide with oil
- Dacromet / Geomet
- Passivation (stainless)
Where it is used
Typical applications
Representative positions rather than an exhaustive list. Many of our parts are designed for one specific assembly and never appear in a catalogue.
| Assembly | Typical use |
|---|---|
| Smartphone mid-frames | M1.0–M1.4 pan head screws joining display brackets to the chassis |
| Notebook hinges | M1.6–M2.0 flat head screws with threadlocker pre-applied |
| Camera modules | M1.2 low-head screws keeping the module stack under 0.8 mm |
| Robot finger joints | M1.4–M2.0 high-strength screws retaining pulley and linkage plates |
| PCB hardware | M2.0–M3.0 screws into brass inserts and standoffs |
| Wearable cases | M0.8–M1.2 stainless screws with sealed heads |
Quality control
What we measure on every lot
Inspection is not a final gate. It is a set of checks placed where a process can actually drift, with the result recorded against the lot code.
01
Thread ring gauge, GO / NO-GO, 100% sampling per lot
02
Head diameter and height, optical comparator
03
Length, contact-type micrometer with low force
04
Concentricity, vision system
05
Drive recess depth and burr, vision and pin gauge
06
Hardness, Vickers micro-hardness (HV 0.3)
07
Salt spray, neutral 5% NaCl, 35 °C
08
Hydrogen embrittlement relief verification for high-strength steel
Questions
About machine thread
The questions our engineers answer most often on this product family.
Still deciding? Send the assembly drawing and the service condition.
We will recommend a size, finish and locking method — and tell you if a different
product family is the better answer.
What is the smallest machine screw you can produce?
M0.5 with 0.125 mm pitch, typically in stainless steel or brass. For M0.5 we recommend a slotted or Phillips 000 drive and a maximum torque of about 0.02 N·m; below that the drive recess becomes the limiting feature rather than the thread.
Should I specify a rolled or cut thread?
Rolled thread is the default for micro screws because it improves fatigue strength and leaves a smoother flank. Cut thread is only relevant for very short production runs or non-standard profiles where a rolling die is not economic.
How do I choose between 6g and 6f?
Class 6g is the general-purpose clearance fit and suits almost all metal-to-metal and metal-to-plastic joints. Class 6f is a tighter fit used when the screw must locate a component as well as clamp it, or when the mating thread is plated after tapping.
Can you supply screws with pre-applied threadlocker?
Yes. Nylon patch, micro-encapsulated adhesive and 3M tape systems are available on the same drawing. See the precoated screws page for cure times, re-use cycles and temperature limits.
What length tolerance should I expect below M2?
For lengths under 3 mm we hold ±0.05 mm. Above 3 mm and up to 10 mm, ±0.10 mm is standard. Tighter callouts are possible but should be discussed with our engineering team because they affect sorting cost.
Related products
Often specified together
These families are frequently used in the same assembly, or as an alternative when the joint requirement changes.
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Need machine thread to your drawing?
Send a drawing or 3D model with the mating material and finish requirement. We reply with a process route, tolerance review and price — usually within two working days.