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+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:Button Head Torx Screws
Materials:Steel
Surface treatment:White zinc plated
Head Type:Button head
Drive:Torx Recess
Thread:Machine Thread
Point:Blunt
Forming:Single Die Heading
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:511
We make button head Torx screws in white zinc plated steel, a low domed head with a six-lobe recess and a machine thread, quoting them from M1 to M14. Dome height, recess size, thread and torque come from your drawing, and the first article is driven with the bit your line will use.
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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.
Button head Torx screws are socket screws with a low domed head and a six-lobe star recess, made in white zinc plated steel and quoted in metric sizes. The dome keeps the fixing out of the way, the star recess takes the drive, and the machine thread clamps the joint. This family is quoted from M1 to M14 with Number 511 and filed against the ISO button head form.
Button head. A shallow dome on a short cylindrical wall, with a flat bearing face underneath.
Torx recess. Six lobes with near-parallel flanks, cut into the top of the dome.
Machine thread. A rolled thread for a tapped hole or a nut, ending in a blunt chamfer.
White zinc. A trivalent zinc deposit, bright and thin, with the usual RoHS compliance.
In use button head Torx screws suit joints that need a low head and a drive that will not slip, where the torque required is modest and the appearance of the dome matters.
The defining difficulty of a button head Torx screw is that the recess is cut into a curved surface. The head has no flat top for the socket to sit in, so the socket depth is limited by the height of the dome, and the entry of the recess is shaped by the curve rather than by a machined ring.
That has two practical consequences. The first is depth: a button head socket is shallower than the socket of a cap head of the same thread, so a button head Torx screw takes less torque before the recess gives. The second is entry: the bit is guided by a curved surface that does not hold it square, so the fit of the bit matters more and a worn bit rounds the lobes sooner.
What the form buys is a head that does not catch. The dome has no edge to cut a hand, to catch a cable or to be struck by whatever slides across the panel, and it stands lower than a cap head. On equipment that is handled, or where a moving part passes close to the surface, that is worth more than the torque it gives up.
The ISO button head form fixes the proportions, so a button head Torx screw can be matched to a counterbore from a table rather than a drawing. The recess, however, is not fixed by the head standard; the star size follows the maker’s practice and the thread, which is why the recess number belongs on the drawing even when the head form is standard.
White zinc finishes the picture. It is a thin, cheap, sacrificial coating that suits a low-value fastener inside a painted or plated assembly, and it does not close up the socket the way a heavier deposit would. Where the joint is outdoors, the same head in stainless is the right part, and the socket is the place that benefits most.
The recorded range is M1 to M14, covering M1, M2, M3, M4, M5, M6, M7, M8, M9, M10 and M14. Custom lengths up to 2,000 mm are subject to DFM review after drawing submission. For button head Torx screws the quotation carries head diameter and height, recess size and depth, the thread and the finish, because the dome height sets the maximum recess depth.
| Item | How it is defined | What we control |
|---|---|---|
| Head | Button head, domed | Head diameter and height |
| Recess | Torx, six-lobe star | Recess size and depth, bit fit |
| Thread | Machine thread | Pitch and length, gauged per batch |
| End | Blunt, chamfered | Chamfer cut, not deburred |
| Finish | White zinc | Deposit thickness and adhesion |
| Length | Under the head | Measured on the shop plate |
Recess size should be confirmed at quotation rather than assumed from the thread. A star that is one size small in a dome is harder to start and easier to damage; one that is large takes material the dome cannot spare. Because the head is domed, the margin around the recess is not visible from the side, and a marginal wall is only found when the socket fails.
Head height is the number that decides how much torque is available. A lower dome looks better and drives worse; a slightly taller one still reads as a button head and carries a deeper socket. Where the joint is tightened to a specified torque, that difference should be settled on the drawing rather than at assembly.
Three features define this part: the dome, the star recess and the white zinc. The first keeps the fixing out of the way, the second is the drive the dome has to accommodate, and the third is the finish of a general-purpose part.
| Feature | What it gives | What it costs |
|---|---|---|
| Domed head | Nothing to catch or strike | Shallow socket, lower torque |
| Short wall | Low overall height | Little material around the recess |
| Torx recess | Drive holds under load | Exact bit required |
| Machine thread | Repeatable clamp in a tapped hole | Needs a nut or a tapped hole |
| White zinc | Thin, bright, RoHS compliant | Thin; rusts if stored damp |
The dome is why the part is chosen and why it has a limit. A designer who wants a low head that looks finished gets both; a designer who wants full cap head torque in the same space will not, because the geometry cannot provide it. That is a design decision, and it is cheaper to make it on the drawing than at the assembly station.
The star recess is the best drive available for a shallow head. It holds the bit on the walls, so the torque that the socket can take goes further than it would with a cross. Where a button head has to be driven hard, Torx is the version to specify; where it is only snugged down, a cross is simpler for the line.
The recorded finish is white zinc, the trivalent deposit used where a part has to look clean and meet the common RoHS limits. On a button head the deposit lands on a dome and inside a recess, so it slightly rounds the top edge and slightly narrows the socket; both are small and both are checked on the finished screw.
| Option | How it protects | Effect on dome and socket | Typical use |
|---|---|---|---|
| White zinc | Sacrificial zinc, trivalent | Thin; socket as plated | Indoor general work |
| Blue zinc | Sacrificial zinc | Thin; brighter tone | Cost-driven indoor |
| Black zinc | Sacrificial zinc, dark | Thin; marks dark panels less | Dark equipment |
| Nickel plated | Barrier deposit, bright | Decorative; wears at the socket | Visible hardware |
| Stainless, plain | Passive chromium oxide film | Socket as cut | Damp and outdoor |
The finish matters less than the socket on this part. A button head is usually chosen for how it looks and behaves, not for how long it survives weather, and inside a painted or plated assembly white zinc is enough. Where the joint is outside, the same screw in stainless is the answer and the dome behaves identically.
If a heavier coating is specified, the socket has to be re-checked afterwards. A flake coating can close a button head socket enough that the bit no longer seats to full depth, and the symptom is a screw that spins at a torque the joint has taken many times before.
Three assemblies where button head Torx screws are the fixing:
| Where it sits | The screw closes a housing where the head must not catch a hand or a cable and the joint is opened for service. |
| When it goes wrong | A protruding cap head snags, and a worn star in a domed head rounds before the joint is tight. |
| Why it happens | The head is exposed, it is low, and the fixing is serviced. |
| What we control | Recess depth and dome checked, first article driven with the production bit. |
| Where it sits | The screw fixes a cover where anything above the surface would be struck by a moving part. |
| When it goes wrong | A taller head would be hit, and a shallow socket leaves no way to remove a stuck screw. |
| Why it happens | The surface is swept, the head must sit low, and the joint is set once. |
| What we control | Head height and recess checked, first article fitted to the cover. |
| Where it sits | The screw holds a bracket or a shelf where the fixing is visible and a smooth dome is part of the look. |
| When it goes wrong | An edge catches and marks, and a plated socket that rusts spoils the appearance. |
| Why it happens | The fixing is visible, it is low, and the assembly is handled. |
| What we control | Dome form and plating checked, first article reviewed on the fitting. |
Four reasons that matter on a domed socket screw, each tied to what the drawing has to prove:
|
Dome height and recess agreed
The head height and the recess size are confirmed together, because the dome height is what limits the socket depth and therefore the torque. Basis: Dome height and recess agreed. |
Head, recess and thread in one route
The domed head and the six-lobe recess are formed in the heading stroke, the thread is rolled and the parts are white zinc plated in the same route. Basis: One route from wire to plated screw. |
|
Recess driven in the dome
The first article is driven with the production bit in the finished dome, because a curved top guides the bit less and a marginal socket is felt at once. Basis: First article driven in the dome. |
First article fixes the setting
The first article fixes the wire, the recess punch and the plating; repeat orders are compared against that record. Basis: First article signed off before the batch is released. |
Shi Shi Tong forms these button head Torx screws from steel wire on single-die headers that form the domed head and cut the six-lobe recess in one stroke, rolls the machine thread to a blunt chamfered end and plates the parts in white zinc. 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 socket into a dome is harder on the punch than cutting it into a flat face, because the die has to hold the curved surface while the punch works. A punch that is slightly worn leaves a socket that is shallow at one side of the dome, and a bit in that socket tips as it is loaded — the failure that looks like a bad bit and is actually a worn tool.
What decides whether button head Torx screws pass is the recess, the dome, the thread and the plate. The inspection agreement covers those, and the criteria come from the drawing.
Dome and recess on the projector |
Thread gauged per batch |
Hardness checked on the wire |
Salt-spray testing of the plate |
The recess is checked for size, depth and lobe condition and driven with the production bit; the lobes are inspected where they meet the dome, because that is where a worn punch shows first. The head is checked for diameter, height and dome form, and the bearing face underneath for flatness.
The thread is gauged per batch and the plate is checked for thickness and adhesion in the socket and on the dome. A salt-spray sample is run where the environment asks for it; on this part the socket is the place that matters, because it is where water sits and where nothing can be repaired.
Every shipment of button head Torx screws is traceable to the wire it was made from and to the plating batch. The grade and heat number are recorded on the material certificate supplied with the parts, and the plating record is kept with the inspection file.
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 plating. The documents carry the drawing revision and the batch number, so a repeat order is made to the same recess geometry 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 domed head the first article is driven with the line bit, because the socket in a dome is the part with least margin. Buyers visit during the process to review samples and to see how the heads and recesses are formed.
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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 plating 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 the socket is cut into a dome, so it is shallower than in a tall cap head. The head sets the depth and the depth sets the torque.
The size the maker pairs with that thread, written on the drawing. It is not automatic across suppliers, and it decides which bit the line stocks.
A button head has a small bearing face relative to a flange or a pan head. On a soft panel a flanged version spreads the load better.
Yes, and faster than on a cap head, because a curved top guides the bit less. The bit should be checked as part of the line setup.
No. It is a thin indoor finish; the socket is where rust starts. Use stainless for damp or outdoor joints.
Head diameter and height, Torx recess size, thread size and length, the finish and the torque the joint will use.
How a button head Torx screw project runs from drawing to repeat delivery:
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1
Send the drawing and the clearance it fits
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→ |
2
Dome height, recess and thread agreed
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→ |
3
First article driven with your line bit
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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 head diameter and height, the Torx recess size, the thread size and length, the finish and the torque the joint will use.
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Head diameter
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Head height
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Torx size
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Thread size
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Length
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Finish
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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
