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 Stainless Screws
Materials:Stainless Steel
Surface treatment:Plain
Head Type:Flat Head
Drive:Torx
Thread:Machine Thread
Point:Blunt
Forming:Single Die Heading
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:95
We make torx stainless screws with a countersunk head and a six-lobe socket, so the head finishes flush and the driver never leaves the recess. Cone angle, socket, thread and grade come from your drawing, and the first article is seated in your countersink and driven with your bit.
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 stainless screws are screws with a six-lobe star socket, in a stainless body, and the recorded item carries a countersunk head that finishes flush with the part it goes into. The recorded item is stainless with a plain finish, a flat head and a machine thread, quoted from M1 to M14 with Number 95.
Torx socket. Six curved lobes with no internal corner, driven with a matching star bit. The bit does not cam out, which on a countersunk head is the property that matters most.
Countersunk head. A cone that seats in a matching countersink and leaves the surface unbroken. It centres the screw as it turns and bears on the cone rather than on a face.
Machine thread. A rolled thread with a blunt chamfered end, made for a tapped hole or a nut. It runs in and out without cutting, which suits a flush fixing that is serviced.
Stainless, plain. Passivated and uncoated, so the cone, the flats of the lobes and the thread are exactly as formed, with no film to fill the socket or to change where the head stops.
On torx stainless screws the head sits in the part, and its visible surface is a narrow ring around a cone. When a driver cams out, it climbs the recess and its corners reach the head; on a flush head that damage lands on the one part of the part the customer sees, and it cannot be dressed out because the surface is flush with the panel.
That is the argument for a star socket on torx stainless screws. A Phillips recess is designed to cam out — that is its warning feature — and the warning costs a flush head its rim. A star socket transmits torque through six flanks and stays seated, so the drive either takes the screw to its torque or the thread gives, and neither of those damages the visible surface.
On torx stainless screws the cone and the socket share a small amount of head height. The cone takes the lower part of the head and the socket has to fit in what is above it; on a small screw that leaves a shallow socket, so the bit has to be the right size and in good condition, and the torque the part will take is set by the cone in the panel rather than by the socket.
The cone has to match the countersink in the part. A head a degree out seats on a line, looks flush from above and rocks when pressed, and on a stainless part there is no coating to hide the mismatch. The first article is seated in a sample of the customer’s panel for that reason.
Plain stainless is passivated after the socket is formed. On this part passivation matters at the cone, which is the largest smooth surface and the one the customer inspects, and a rust bloom there from tooling contamination reads as a material failure.
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; on torx stainless screws the cone angle, the socket size and the thread length are quoted together, because the head carries the cone and the drive in the same space.
| Item | How it is defined | What we control |
|---|---|---|
| Head | Countersunk cone, flat top | Cone angle, diameter and concentricity |
| Socket | Torx, six lobes | Lobe width and depth, bit tried on the part |
| Thread | Machine thread | Pitch and length, gauged per batch |
| End | Blunt, chamfered | Chamfer cut, not deburred |
| Finish | Plain stainless, passivated | Surface condition and film |
| Length | From the top of the head to the end | Measured on the shop plate |
The cone angle is a joint dimension. Ninety degrees is the common case, but a formed countersink in thin sheet is often a degree or two off, and the match is checked on a sample panel rather than assumed from the drawing.
Length is measured from the top of the head, because a countersunk head finishes flush and the top face is the datum that shows. Measuring from the start of the cone gives a screw short by the head depth, and in a thin panel that difference is the whole engagement on the far side.
Three features define torx stainless screws: the star socket, the countersunk cone and the stainless body. The first keeps the drive clean, the second delivers a flush joint, and the third is what allows the part to sit outdoors without a coating.
| Feature | What it gives | What it costs |
|---|---|---|
| Torx socket | No cam-out, so the rim stays intact | Needs the matching star bit |
| Countersunk head | Flush joint, self-centring | Bears on the panel; the panel is the limit |
| Stainless | No coating to chip at the cone | Galls against stainless; pits in chloride |
| Machine thread | Removable and repeatable | Needs a tapped hole or a nut |
| Plain finish | Cone and socket as formed | No added wear resistance |
The combination is common on equipment that is assembled with a powered driver and finished flush. A panel line with a torque-controlled star driver can close a flush joint all day without marking the panels, because the bit never leaves the socket, and the same screws can be opened later with the same bit.
The cost is the tool. A star socket needs its own bit, and a worn one will round the lobes of a stainless head with little warning. On a flush head that failure is visible on the outside of the product, which is why the first article is driven with the production bit and the bit is replaced on a schedule rather than on failure.
Torx stainless screws are finished plain and passivated. Nothing is added, so the cone seats exactly as formed and the socket keeps its depth; a coating would change where the head stops in the countersink, and on a flush joint that is the visible dimension.
| Option | How it protects | Effect on cone and socket | Typical use |
|---|---|---|---|
| Stainless A2, plain | Passive chromium oxide film | None; gauged as formed | Outdoor and general panels |
| Stainless A4, plain | Passive film with molybdenum | None; gauged as formed | Coastal and washdown |
| Black oxide on stainless | Dark conversion film | Almost no change | Dark visible panels |
| PTFE coated | Dry film lubricant | Film builds; socket re-checked | Joints that seize |
| Zinc plated steel | Sacrificial zinc | A few microns; cone and socket re-checked | Indoor, cost-driven work |
Stainless has one behaviour that matters in a countersink: galling. A stainless cone driven into a stainless countersink, especially in thin sheet that work-hardens, can seize before the head is seated, and a seized flush head cannot be removed without damaging the countersink. A lubricant, or a different grade for the sheet, prevents it.
The other limit is chloride. A2 pits at the socket and at the thread in salt-laden service, and a pit inside a star socket is where the bit stops seating. Where the joint is coastal or washed, the grade is the answer rather than any finish.
Three assemblies where torx stainless screws with a countersunk head are the fixing:
| Where it sits | The screw fixes a face plate or a bezel where the head must finish flush, the panel is visible, and the joint is assembled with a power driver. |
| When it goes wrong | A cross recess cams out and marks the rim of the flush head, and a proud head catches on covers and cloths. |
| Why it happens | The face is visible, the driver is powered, and the fixing repeats. |
| What we control | Cone seated in a sample panel, socket driven with the production bit. |
| Where it sits | The screw closes a cover where the surface must be flat, the joint sees water, and the fixing is opened for service. |
| When it goes wrong | A plated head rusts at the cone, and a socket that fills with water corrodes from the inside. |
| Why it happens | The joint is wet, the head is flush, and the part is serviced. |
| What we control | Grade confirmed on the certificate, socket and cone checked, thread gauged. |
| Where it sits | The screw joins a thin panel where a countersink is formed in the sheet and the head has to sit flush without breaking through. |
| When it goes wrong | A cone that is too deep breaks through the sheet, and a head that rocks leaves a crescent of light and a loose joint. |
| Why it happens | The sheet is thin, the head is flush, and the fixing repeats. |
| What we control | Cone angle and diameter checked against the sheet, thread engagement verified. |
Four reasons that matter on torx stainless screws, each tied to what the drawing has to prove:
|
Cone and socket reviewed together
The cone angle, the head height and the socket size are reviewed as one set, so a cone that would break through or a socket too shallow for the bit is raised before the die is cut. Basis: Cone and socket reviewed as one set. |
Heading, socketting and passivation in one route
The countersunk head and the star socket are formed in one stroke, the thread is rolled and the parts are passivated in the same route. Basis: One route from wire to passivated screw. |
|
Socket driven, cone seated
The socket is driven with the production bit and the cone is seated in a sample panel on the first article, because both features are proved in use rather than by dimension. Basis: First article driven and seated. |
First article fixes the setting
The first article fixes the wire heat, the socket punch and the passivation; repeat orders are compared against that record. Basis: First article signed off before the batch is released. |
Shi Shi Tong forms these torx stainless screws from stainless wire on single-die headers that cut the countersunk cone and the six-lobe socket in one stroke, rolls the machine thread to a blunt chamfered end and passivates the parts. The first part of every run is measured on the cone, turned with the production bit and seated in a sample panel before the batch continues.
|
|
The socket punch works inside a head that the cone has already made thin, so the tool has less room than on a pan head. A worn punch leaves a socket that is shallow at the lobe tips, and a shallow star socket on a stainless head rounds quickly: the bit sits high, the flanks carry the load at their edges, and the damage shows on the outside of the product.
What decides whether torx stainless screws pass is the cone, the socket, the thread and the alloy. The inspection agreement covers those, and the criteria come from the drawing.
Cone and socket on the projector |
Thread gauged per batch |
Hardness checked on the formed head |
Salt-spray testing of the stainless grade |
The cone on torx stainless screws is checked for angle, diameter and concentricity, and the socket for lobe width and depth; both are then proved in use, with the first article seated in a countersunk sample and turned with the production bit.
Seating is checked with a light behind the head, which is the customer’s acceptance test on a flush joint and catches the ring of contact that no dimension describes. The thread is gauged per batch, and the alloy is confirmed on the certificate.
Every shipment of torx stainless 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 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 flush head the first article is seated in the customer’s own panel, so the cone and the countersink are proved together. Buyers visit during the process to review samples and to see how the heads and sockets 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 |
Because a flush head cannot afford a cam-out. A Phillips that climbs the recess marks the rim of the head, and on a flush joint that mark is on the visible surface.
The socket will take more than the countersink will. The limit is the panel: on thin sheet the cone starts to yield before the star socket is in trouble.
It fits, but shallower than on a pan head, because the cone takes the lower part of the head. The bit has to be in good condition for that reason.
In a stainless countersink it can. A lubricant on the thread, or a different grade for the sheet, prevents it; once seized, the countersink is usually lost.
Plain stainless does not rust like steel, but A2 pits in chloride at the socket and the thread. The grade is the specification.
Cone angle and diameter, socket size and depth, thread size and length, length from the top of the head, and the stainless grade.
How a torx stainless screw project runs from drawing to repeat delivery:
|
1
Send the drawing and the countersink sample
|
→ |
2
Cone, socket and thread review
|
→ |
3
First article seated and driven
|
→ |
4
Batch production and repeat orders
|
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 cone angle and diameter, the socket size and depth, the thread size and length, the length from the top of the head and the stainless grade.
|
Cone angle
|
Head diameter
|
Socket size
|
|
Socket depth
|
Thread and length
|
Stainless grade
|
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
