Tel：
+86 13143444311
Email：sst@szsst88.com
Fax：+0086-755-27322278
Address：Building 9, First Industrial Zone, Tantou Industrial City, Songgang Street, Baoan District, Shenzhen 518105, Guangdong, China
Type:Tiny Torx Screws Cap Head Stainless Steel
Materials:Stainless Steel
Surface treatment:Plain
Head Type:Cap Head
Drive:Torx (six-lobe star)
Thread:Machine thread
Point:Blunt
Forming:Single Die Heading
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:13
We make tiny Torx screws in passivated stainless with a cap head and a six-lobe star recess, quoting them from M1 to M14. Recess size and depth, head height, thread and torque come from your drawing, and the first article is driven with your production bit.
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ISO 9001:2015 · Manufacturing since 1998 · 8,678+ customers · 89 countries and regions
Made to order – there is no stock catalogue. Each part is produced to your drawing, and production starts after drawing review and first-article approval.
Tiny Torx screws are miniature machine screws with a six-lobe star recess, made here in stainless with a cap head and quoted from M1 to M14 with Number 13. The recess is the whole drive at this scale: there is no room for a slot or a cross beside it, so the star carries the torque and the wall of metal left around it carries the head.
Six-lobe recess. A star-shaped socket with rounded lobes, driven with the matching Torx bit. The bit contacts the flanks rather than the corners, so the force is spread and the bit does not climb out.
Cap head. A cylinder with a flat top and a flat bearing face, made to sit in a counterbore.
Machine thread. A rolled metric thread, fine in pitch at the small sizes, for a tapped hole or a nut.
Stainless, plain. Passivated and uncoated, so the recess is as cut and the alloy is the protection.
At M2 and below the head is a few millimetres across and the recess takes most of it. An M2 cap head measures about 3.8 mm; the Torx recess for that thread is around 1.7 mm across, and the depth is under a millimetre. What is left between the lobes and the outside of the head is a wall of about a millimetre, and that wall is the feature that decides whether the screw survives being driven.
The six-lobe form is what makes that possible. A cross recess of the same size has four arms ending in corners; a star has six lobes with radiused roots, and the bit drives on the flanks, so the same torque is shared over more surface and the bit does not cam out upward. On a miniature screw that is the difference between a head that takes a drive and one that turns into a polished hole.
The limit moves from the drive to the wall. A star recess cut too deep leaves too little material under it, and the head shears off at the recess floor; a recess cut too shallow leaves the bit standing proud, engaged on the top of the lobes only, and it reams the shape out. Depth, not size, is the parameter that fails silently.
Thread pitch is the other miniature problem. At M1.2 the pitch is 0.25 mm, and one crossed start takes the thread out of a soft tapped hole in a way that M6 never does. Engagement depth in the mating material matters more here than the screw length, because there are fewer threads doing the work.
Handling is part of the design at this scale. Stainless is effectively non-magnetic, so a magnetised driver will not pick these up, and assembly lines use vacuum nozzles or tweezers. That is a property of the material, not a defect, and it is worth knowing before the packaging and the assembly method are chosen.
The recorded range is M1 to M14, with M1, M2 and M3 being the sizes where the miniature problems above actually bite. Custom lengths up to 2,000 mm are subject to DFM review after drawing submission. For tiny Torx screws the quotation carries the recess size and depth with the head, because the bit the customer will use is the tool that decides the joint.
| Item | How it is defined | What we control |
|---|---|---|
| Head | Cap head, flat face | Diameter, height and face flatness |
| Recess | Torx star, six lobes | Recess size, depth and lobe form |
| Thread | Machine thread, fine pitch at small sizes | Pitch and length, gauged per batch |
| End | Blunt, chamfered | Chamfer cut, not deburred |
| Material | A2 stainless | Grade and heat number on the certificate |
| Finish | Passivated | Surface condition and film |
Tiny Torx screws are quoted with the bit size in the same note, because the bit is the tool that decides the joint. Recess depth belongs on the drawing even where the size is standard. Two suppliers can both cut a T6 and differ in how deep, and the shallower one will take less torque before the bit slips and the deeper one will shear sooner under the head.
Head height follows the recess. A low cap head on a tiny screw looks right and leaves almost nothing under the recess floor, so where the joint is driven in production the standard height is the safer specification.
Three features define the part: the miniature cap head, the star recess that nearly fills it, and the stainless body. The first two are a geometry problem, because drive and wall compete for the same few millimetres; the third removes any plating from the equation and leaves the recess exactly as cut.
| Feature | What it gives | What it costs |
|---|---|---|
| Star recess | No cam-out, torque on flanks | Needs the exact bit size |
| Large recess-to-head ratio | Real drive on a tiny head | Thin wall under and beside it |
| Fine thread | More threads per millimetre | Crosses easily in soft materials |
| Passivated stainless | Recess as cut, no plating build | Softer than steel; galls dry |
| Non-magnetic body | No magnetic contamination | Will not pick up with a magnet |
The no-cam-out property is why tiny Torx screws are chosen on small assemblies in the first place. A cross recess at M1.6 with a worn driver climbs out under load and damages the surrounding paint; a star drives straight until the tool or the recess actually fails.
What tiny Torx screws cost is tool discipline. A star bit that is a size small will not seat, and one that is worn will ream the lobes, and neither shows until the screw is in a finished assembly. The right bit, changed when it wears, is part of using these screws.
The recorded finish is passivation with no coating. At this scale that is the only sensible choice: a plating build of a few microns would be a measurable fraction of a recess that is under a millimetre deep, and it would close the lobes that the bit has to enter. Plain stainless keeps the recess at the size the drawing says.
| Option | How it protects | Effect on the recess | Typical use |
|---|---|---|---|
| A2 stainless, passivated | Passive chromium oxide film | None; recess as cut | Electronics and instruments |
| A4 stainless, passivated | Passive film with molybdenum | None; recess as cut | Medical and marine |
| Steel, black oxide | Conversion film, oiled | No measurable build | Internal micro-mechanisms |
| Steel, zinc plated | Sacrificial zinc | Build re-checked at the recess | General indoor work |
| Titanium | Native oxide | None; recess as cut | Weight-critical and implant |
For tiny Torx screws the A2 and A4 choice follows the environment, not the size. A4 is the grade for chlorides, which on a miniature screw means a medical instrument that is disinfected or a marine sensor rather than a coastal structure.
Where the screw is turned repeatedly during service, the recess wears before the thread does. A passivated surface wears more slowly than a plated one at the lobes, because there is no soft deposit to rub off and leave a step for the bit to catch on.
Three assemblies where tiny Torx screws are the fixing:
| Where it sits | The screw closes a housing where the fasteners are small, the space around them is tight and the head must not be driven off-centre. |
| When it goes wrong | A cross recess at this size cams out with a worn driver and marks the housing. |
| Why it happens | The head is small, the joint is assembled in volume, and appearance matters. |
| What we control | Recess gauged after passivation, first article driven with the production bit. |
| Where it sits | The screw retains a lens mount or a bezel where the head has to be low, stainless and invisible in use. |
| When it goes wrong | The thin wall around the recess shears, or the bit reams the lobes during a repair. |
| Why it happens | The screw is small, serviced, and the material cannot rust or be magnetic. |
| What we control | Wall thickness checked on the projector, recess depth and torque agreed. |
| Where it sits | The screw fixes a plate inside a hand instrument where the part is cleaned, inspected and must be non-magnetic. |
| When it goes wrong | A burr in the recess stops the bit seating, and a plated screw can shed particles. |
| Why it happens | The joint is cleaned, it is inspected under magnification, and the material must be stainless. |
| What we control | Burr check at the recess, passivation record with the batch. |
Four reasons that matter on tiny Torx screws, each tied to what the drawing has to prove:
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Recess size and depth agreed
The star size and the recess depth are settled with the head height before tooling, because the wall left around the recess is the limit on the part. Basis: Recess and depth agreed before tooling. |
Head, recess and thread in one route
The head and star recess are formed in one stroke, the fine thread is rolled and the parts are passivated in the same route. Basis: One route from wire to passivated screw. |
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Recess checked with the bit
The first article is driven with the production bit at the joint torque, because a star that measures correctly can still be reamed by a worn tool. Basis: First article driven with the bit. |
First article fixes the wall
The first article fixes the recess depth and the wall thickness; repeat orders are measured against that record. Basis: First article signed off before the batch. |
Shi Shi Tong forms tiny Torx screws from stainless wire on single-die headers that form the cap head and cut the star recess in one stroke, rolls the fine machine thread to a blunt chamfered end and passivates the parts. The first part of every run is measured on the head and recess, driven with the production bit and entered into a thread gauge before the batch continues.
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Cutting a star into a head of a few millimetres is where the part is decided. The punch has a star-shaped end that has to reach full depth without tearing the lobes, and it wears at the roots; a worn punch leaves rounded lobes that look right and drive badly, and the failure appears on the assembly line rather than at the machine.
What decides whether tiny Torx screws pass is the recess, the wall around it, the thread and the grade. For tiny Torx screws the inspection agreement covers those four, and the criteria come from the drawing.
Recess and wall on the projector |
Thread gauged per batch |
Hardness checked on the wire |
Salt-spray testing of the grade |
The recess is checked for size, depth and lobe form under magnification, and the wall between the lobes and the head edge is measured rather than assumed. The thread is gauged per batch at the small sizes with the matching gauge, and the grade is confirmed on the mill certificate.
A burr in the recess of tiny Torx screws is checked for as well, because a burr that measures inside tolerance can still stop the bit from seating and turn a good head into a bad one at the assembly station.
Every shipment of tiny Torx screws is traceable to the wire it was made from and to the passivation batch. The grade and heat number are recorded on the material certificate supplied with the parts, and the inspection records follow the criteria agreed on the drawing.
ISO 9001:2015 |
RoHS test report |
Registered trademark |
Patent: security screw and driver |
With each batch we supply the material certificate, the inspection record for the criteria on the drawing and, where it is listed, the third-party report for the grade or the passivation. The documents carry the drawing revision and the batch number, so a repeat order is made to the same recess depth that was approved.
More than 8,678 customers in 89 countries and regions have ordered from Shi Shi Tong; 87% of orders come from repeat customers and 56% through referrals. Most projects follow the same route: drawing review, first-article approval, then batches checked against that sample. On a tiny screw the first article is driven with the customer’s bit at the joint torque, because the recess and the tool are the joint. Buyers visit during the process to review samples and to see how the heads are formed.
|
8,678+
customers served
|
87%
of orders from repeat customers
|
56%
of orders through referrals
|
89
countries and regions shipped to
|
Buyers and quality engineers visit for sample review, process discussion and supplier audits; the visit is arranged around production so the headers and the passivation line can be seen on the day the parts run.
Customer group visit – sample review |
Customer group visit – process discussion |
Customer group visit – factory tour |
Customer visit – project kick-off |
Danish customer – drawing review |
Industry exhibition – meeting customers |
The star spreads the drive over six flanks, so a tiny head can take a real torque without the bit cam-out that a cross recess shows at this size.
The wall around the recess. A recess cut too deep leaves too little metal under it, and the head shears at the recess floor.
It has to be the exact size and in good condition. A worn bit reams the lobes, and the damage does not show until the assembly is together.
A2 and A4 stainless are effectively non-magnetic. Vacuum nozzles or tweezers are used on the assembly line.
At M1 to M3 there are few threads doing the work, so engagement depth in the mating part matters more than added screw length.
Thread size and length, head diameter and height, recess size and depth, the grade, and the torque the joint will use.
How tiny Torx screws run from drawing to repeat delivery:
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1
Send the drawing and the bit you drive with
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→ |
2
Recess size, depth and wall agreed
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→ |
3
First article driven with your bit and torque
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→ |
4
Batch production and repeat orders
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Each step is confirmed with you before the next one starts; the drawing revision from the first article is what repeat orders are checked against.
For a quotation, send the drawing with the thread size and length, the head diameter and height, the recess size and depth, the grade and the torque the joint will use.
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Thread size
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Length
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Head diameter
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Recess size
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Recess depth
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Driver bit
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Sending a drawing? The form below does not take attachments. Email the PDF, DXF or STEP file to sst@szsst88.com with the part name and quantity in the subject line – the drawing is reviewed and a quotation follows.
+86 13143444311
sst@szsst88.com
