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:Torx Socket Head Screws
Materials:Stainless Steel
Surface treatment:Plain
Head Type:Cap Head
Drive:Torx six-lobe socket, punched in the head face
Thread:Coarse single-lead self-tapping thread, rolled, full to the head bearing face
Point:Sharp tapered point; no drill point, no cutting slot
Forming:Single-die heading with socket punch, thread rolling, cleaning and passivation, sorting
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:427
We manufacture torx socket head screws with a cylindrical cap head and a six-lobe star socket, a rolled machine thread and a blunt chamfered end, in stainless steel with a plain finish. Head, socket size and depth, thread and length are taken from your drawing.
Watch the factory video·Email sst@szsst88.com
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.
Torx socket head screws are cap head screws driven with a six-lobe star socket instead of an internal hexagon. The recorded item on this page is stainless steel with a plain finish, a cylindrical cap head, a rolled machine thread and a blunt chamfered end, quoted from M1 to M14 with Number 427.
Cap head. A short cylinder with a flat top and a full flat bearing face. It sits in a counterbore, spreads load over the whole head width, and leaves a clean circular outline on a machined surface.
Torx socket. Six curved lobes cut into the head, driven with a matching star bit. There are no internal corners to round off the way there are in a hexagon socket, so the drive survives higher torque and more assembly cycles at the same head size.
Machine thread. A rolled thread for a tapped hole or a nut, with a blunt end. This is a machine screw: the thread it engages already exists, and the chamfer lets the first turn enter cleanly.
Stainless, plain. The alloy provides the protection, so there is no coating to chip at the socket edges and no film to change the thread. That matters on this head form, because the socket is the feature that fails first when a coating builds up inside it.
Why the star instead of a hex. A hexagon socket has six sharp internal corners, and those corners are where the key first rounds the head. A star socket has no sharp corners in the drive path, so the torque goes into the thread rather than into deforming the socket.
The cap head and the star socket are formed in one heading stroke. The head is a plain cylinder with a chamfered top edge, and the socket is punched into the flat top; doing both in the same stroke keeps the socket concentric with the shank, which is what stops the bit tipping the head as it drives.
The socket depth is set against the head height. A socket that is too shallow bottoms out on the bit and rounds the lobes; one that is too deep cuts into the material that carries the head load, and on a cap head the wall between the socket and the outside of the head is already thin on small sizes.
The thread is rolled from the point up to the underside of the head. Rolling work-hardens the stainless flank and leaves a smooth surface, and it is what gives the thread its wear resistance in a joint that will be opened more than once.
The end is blunt with a small chamfer. A torx socket head screw does not need a point, because the hole is tapped; the chamfer is there to let the first thread start without catching on the lead-in.
Cleaning and passivation follow. Because the recorded finish is plain, the thread and socket that are measured are the ones that ship — no coating thickness to allow for, and no risk of a film filling the lobes of the socket. On a torx socket head screws part the socket is exactly as punched.
The family is quoted from M1 to M14, with M1, M2, M3, M4, M5, M6, M7, M8, M9, M10 and M14 in the recorded range. Custom lengths up to 2,000 mm are subject to DFM review after drawing submission; torx socket head screws are used from the tiny instrument sizes up to heavy machine sizes, and the star socket is what makes the small end practical.
| Item | How it is defined | What we control |
|---|---|---|
| Thread | Metric machine thread, rolled | Gauged per batch |
| Head | Cap head, flat top, chamfered edge | Diameter and height on the projector |
| Socket | Torx six-lobe, sized to the thread | Checked with the production bit |
| Socket depth | Set against the head height | Checked on the section |
| End | Blunt with a small chamfer | Checked on the first article |
| Length | From under the head to the end | Measured on the shop plate |
The socket size is the dimension the assembly depends on. A star bit one size small will still enter and will round the lobes under load; a bit one size large will not engage at all. The size is quoted with the thread, and the first article is driven with the production bit rather than with a gauge.
The head height is what decides the counterbore. A cap head is taller than a pan head of the same thread, so a counterbore that was designed for a pan head will not take it — and on a visible machined face a head that stands proud is obvious from a distance.
The choice between a star socket and a hexagon socket is the whole point of this part, and it comes down to where the drive fails.
| Feature | What it gives | What it costs |
|---|---|---|
| Torx socket | No sharp internal corners, high torque, long bit life | Needs a star bit rather than a hex key |
| Cap head | Full flat bearing face, sits in a counterbore | Taller than a pan or countersunk head |
| Machine thread | Full engagement in a tapped hole | No self-tapping action |
| Stainless body | No coating to chip or fill the socket | Galls against stainless |
| Blunt end | Stops at the thread end | Cannot start in an unthreaded hole |
A hexagon socket transmits torque through six flats that meet at sharp corners, and those corners are stress raisers. On a small head the key is small too, and the head rounds before the thread is anywhere near its limit. A star socket spreads the load along curved flanks, so the same head size carries more torque without deforming.
The practical gain is on the assembly line and in service. A star bit does not lift out of the socket the way a worn hex key does, so the head stays intact through repeated assembly, and a screw that has to come out of a stainless joint after a while comes out with its socket still usable.
The cost is tooling, and it is worth stating. A hex key is in every toolbox; a star bit is not. Where a maintenance team opens a joint in the field, the drawing should either specify the bit size clearly or accept that the joint needs the right tool to be present. On torx socket head screws that line between the thread and the bit size is the most useful thing on the print.
The recorded finish is plain stainless with no coating and no applied film. On a socket head that is the practical choice: any coating that builds inside the socket changes the fit of the bit, and the socket is exactly where the part is loaded.
| Option | What it does | Effect on socket and thread | Typical use |
|---|---|---|---|
| Cleaned and passivated | Removes free iron after forming | No dimensional change | General and wet service |
| Satin bead blast | Even matte face on the head | Edges softened slightly | Visible machined assemblies |
| Bright passivated | Cleaner, brighter surface | No dimensional change | Instruments and appliances |
| Electropolished | Levels micro peaks, stronger passive layer | Very slight removal in the socket | Hygienic and chemical service |
| Dry film in the socket | Reduces galling between bit and socket | Film checked with the bit | Joints opened often |
Passivation is the treatment that can be added without changing the drive. It removes the embedded iron left by heading and rolling and leaves the geometry alone, so the socket still takes the bit the same way — which is why it is the default on a plain stainless part.
A coating is a different matter. Zinc or nickel on a socket head adds a few microns inside the socket, and on a small head that is enough to make the bit tight; a plated version therefore has to be checked with the production bit after plating, not only gauged on the thread.
Three assemblies where a socket cap head has to take torque in a small size:
| Where it sits | The screw clamps a jaw, a stop or a plate to a hardened body, where the head sits in a counterbore and the joint is tightened hard. |
| When it goes wrong | A hexagon socket rounds at the corners under high torque, and a head that is too tall fouls the work. |
| Why it happens | The joint is tightened hard, the space is machined, and the fixing is repeated in a pattern. |
| What we control | Socket size and depth checked, head height against the counterbore, first article driven at joint torque. |
| Where it sits | The screw holds a guard or a panel on stainless equipment that is cleaned daily, where a plain head with a clean socket is easier to wash than a cross. |
| When it goes wrong | A plated socket fills with coating and traps residue, and a cross recess holds water in its corners. |
| Why it happens | The equipment is stainless, it is washed, and the fixing is visible. |
| What we control | Grade and passivation recorded, socket checked with the bit, thread gauged per batch. |
| Where it sits | The screw fixes a mount, a plate or a bracket at sizes down to M2, where the head is small but the joint still has to be tightened positively. |
| When it goes wrong | A hex key at that size rounds the socket almost immediately, and a slotted head cannot take the torque. |
| Why it happens | The assembly is small, the joint is set once, and the fixing is precise. |
| What we control | Socket checked with the production bit, head and socket depth on the projector. |
Four reasons that matter on a star-socket cap head, each tied to what the drawing has to prove:
|
Socket and head reviewed together
The socket size, the socket depth and the head height are reviewed as one set, so a socket that would thin the head is raised before the die is cut. Basis: Socket and head reviewed as one set. |
Head, socket and thread in one route
The cap head and the star socket are formed in one stroke, and the machine thread is rolled to a blunt chamfered end. Basis: One route from wire to passivated screw. |
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Socket and thread checked on the part
The socket is checked with the production bit and the thread is gauged per batch, both in the finished condition. Basis: First article driven with the production bit. |
First article to repeat production
Repeat orders are compared with the first article, which holds the drawing revision, wire heat, die set and thread roll. Basis: First article signed off before the batch is released. |
Shi Shi Tong forms these torx socket head screws on a single-die header that upsets the cap head and punches the six-lobe socket in one stroke, then rolls the machine thread to a blunt chamfered end. The parts are cleaned and passivated. The first part of every run is measured on the head and the socket, and driven with the production bit at the joint torque, before the batch continues.
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The socket punch is the tool that defines the part. A worn punch leaves lobes that look correct and allow the bit to rock, and a bit that rocks rounds the socket on the first hard drive. The socket is therefore checked by driving rather than by looking, and the punch is changed on that evidence. Every batch of torx socket head screws is checked on the socket before it is released.
What decides whether torx socket head screws pass is the socket, the head, the thread and the surface. The inspection agreement covers those, and the criteria come from the drawing.
Head and socket on the projector |
Thread gauged per batch |
Hardness testing against the property class |
Salt-spray testing where the service requires it |
The socket is checked by driving the first article at the joint torque with the production bit and then inspecting the lobes. A polished line along one flank is the first sign of a socket that is too shallow or a punch that is worn, and it appears before the bit actually slips.
The head is checked for height and for the chamfer at the top edge. A cap head with a sharp top edge cuts the hand and marks the counterbore, and on a stainless part that mark cannot be polished out afterwards.
Every shipment of torx socket head screws is traceable to the wire it was made from. 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 material. The documents carry the drawing revision and the batch number, so the paperwork can be matched to the parts.
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 socket head the first article is driven at the joint torque with the production bit, because the socket is what fails first and the failure is hidden inside the head. Buyers visit during the process to review samples and to see how the heads are formed.
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8,678+
customers served
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87%
of orders from repeat customers
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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 header 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 |
A cap head screw driven with a six-lobe star socket. There are no sharp internal corners in the drive path, so the head takes more torque without rounding.
A hex socket has six sharp corners where the key rounds the head first. A star socket spreads the load along curved flanks and survives more cycles at the same size.
No. It has a machine thread and a blunt end, so it goes into a tapped hole or a nut rather than forming its own thread.
From under the head to the end. With a machine thread the whole length is engagement once it is inside the tapped hole.
It can, against another stainless thread or a worn bit. A dry film in the socket, a different alloy pairing, or a lower torque with more engagement are the usual answers.
Thread size and pitch, head diameter and height, socket size and depth, length and datum, stainless grade and surface treatment.
How a torx socket head screw project runs from drawing to repeat delivery:
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1
Send the drawing or sample
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→ |
2
Socket and head review
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→ |
3
First article driven at joint 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 pitch, head diameter and height, socket size and depth, length and datum, stainless grade and surface treatment.
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Thread and pitch
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Head diameter and height
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Socket size and depth
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Length and datum
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Grade
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Surface treatment
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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
