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
Place of Rorigin:Guangdong, China (Mainland)
Brand name:OEM
Model number:sst 454
Materials:Carbon steel
Surface treatment:Eco nickel plated
Head Type:Cap head, Torx form
Drive:Torx (six-lobe)
Thread:machine thread
Point:Plain, chamfered
Forming:Cold heading; recess struck with the head; thread rolled
Recess depth:Checked with the bit after plating
Size:M3.5*13
Available materials:titanium, aluminum, copper, stainless steel, carbon steel
process:single mold
We make nickel plated torx head cap screws in carbon steel, with the cap head and star recess formed together and the thread rolled, quoted with head dimensions, recess and class to the drawing. The Torx lobes carry torque without the corners of a hexagon socket, so the same drive fits in a smaller head — but the head height is its own standard, not the Allen cap head one.
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.
A torx head cap screw is a socket head screw with a six-lobe star recess in place of the hexagon. This part is carbon steel, nickel plated, with a cylindrical cap head and a flat bearing face, and is quoted with the head and length made to the drawing, so the counterbore and the bit can both be matched to it.
Cap head. A cylindrical head with a flat bearing face, the strongest socket form for the head height.
Torx recess. Six lobes with rounded roots, driven with a star bit of the matching size.
Carbon steel body. Strong and inexpensive, with a class to suit the joint.
Nickel plating. A hard, bright barrier layer that keeps the head edges crisp.
They are used where a head has to be small, flush-faced and driven hard: tools, appliances, automotive brackets and equipment that is assembled with torque-controlled drivers on a line rather than by hand, where a rounded recess stops the station.
A hexagon socket transfers torque through six flat faces that meet at sharp corners, and those corners are stress raisers both in the socket and in the key. A Torx recess has six lobes with rounded roots, so the same driving torque is spread over a larger curve rather than concentrated at a corner. The result is that a torx head cap screw can carry the same torque in a smaller and shallower recess than a hex socket of the same head.
That is the practical reason for the drive on a cap head. It is not that Torx is stronger in absolute terms; it is that for a given head size the drive can be made smaller, which leaves more material around it. On a joint where the head has to fit inside a counterbore or beside another part, that margin is the difference between a head that fits and one that does not.
The cost is on the tooling side. A Torx bit fits one size only, it is more expensive than an Allen key, and a worn or wrong-size bit rounds the lobes rather than slipping out. That is why the drive is chosen where the assembly is controlled and the bits are managed, not on a site where any tool might be used.
The standard is a separate matter from the drive. A Torx cap head is specified to its own head dimensions, and they are not the same as the hexagon socket cap head of the same thread. Head height and diameter differ, so a drawing that names the drive but copies the hexagon head table will produce a part that fits nothing.
The plating interacts with the recess. Nickel builds inside the lobes as well as on the face, and on a small recess that film is enough to change how the bit feels: a screw that takes a bit on the bench can be tight on the line. That is why the recess is checked with the bit after plating.
So a torx head cap screw is specified by three things that work together: the head dimensions of the Torx cap head standard, the recess size, and the drive torque the joint needs. Chosen together, the part is compact and reliable; chosen by copying a hexagon cap head, it is neither.
Torx head cap screws are quoted by thread size and pitch, length, head diameter and height, recess size and depth, property class and finish. Custom lengths up to 2,000 mm, subject to DFM review after drawing submission. The quotation carries the material, the head, the recess, the thread and the plating.
| Item | How it is defined | What we control |
|---|---|---|
| Body | Carbon steel | Grade and property class |
| Head | Cap head, Torx form | Diameter, height and bearing face |
| Recess | Torx | Size, depth and lobe form |
| Thread | Machine thread | Size, pitch and class |
| Length | Under the head | Length and thread run |
| Finish | Nickel plated | Thickness and coverage in the recess |
The head is written to one standard, not to a mix. Head height and diameter are the numbers a counterbore depends on, and they differ between the Torx cap head table and the hexagon one.
The recess is written as a size and a depth, and checked with the bit after plating. A recess cut to the minimum depth and then plated is the usual cause of a part that feels tight on the line.
The property class is written for steel, since this is a steel part; the class sets the preload the head has to carry, and the head is sized to take it.
Four properties decide this part, and each carries a cost:
| Property | What it gives | What it costs |
|---|---|---|
| Torx recess | More torque in a smaller recess | One bit size only; bits cost more |
| Cap head | A flat bearing face and full depth | Stands proud of the surface |
| Carbon steel | Strength at low cost | Needs plating, and a class that suits |
| Nickel plating | Hard, bright, corrosion resistant | Builds in the recess |
The value is a compact, strong head driven by a recess that neither climbs out nor corners under load, on equipment that is assembled with controlled torque and serviced with the right bit at hand rather than a key from a drawer.
The cost is on the tool and the standard: a specific bit must be available at every station, and the head must be dimensioned to its own table rather than to the hexagon one.
The recorded finish is eco nickel plating, a hard barrier layer that keeps the head and the lobes crisp. It does not sacrifice itself at a scratch the way zinc does, so its protection depends on staying continuous, and the head edge is where that is hardest.
| Option | How it protects | Effect on the recess | Typical use |
|---|---|---|---|
| Nickel | Hard barrier layer | Builds; bit fit re-checked | Visible and handled parts |
| Zinc | Sacrificial layer | Thin; softer at the lobes | General indoor hardware |
| Black oxide | Conversion layer | Nearest to zero build | Tooling and fixtures |
| Dacromet | Thick barrier | Builds; recess re-cut in spec | Automotive underbody |
| Dry film lubricant | Low-friction film | Thin; eases the drive | Joints opened often |
Nickel is chosen where the head is seen and the part is handled: it wears better than zinc at the lobes and keeps the recesses clean through the years.
Where the joint is outdoors, zinc or a zinc flake system protects better than nickel at a scratch, and both need the recess re-checked after coating because they build inside the lobes.
Three products where a compact head is driven hard:
| Where it sits | The screw holds a housing or a gearbox cover where the head sits beside moving parts. |
| When it goes wrong | The head is too large for the space, or the recess rounds under a controlled driver. |
| Why it happens | A hexagon head was specified for a space that only fits the smaller Torx head. |
| What we control | Head dimensions set from the space; first article fitted and driven. |
| Where it sits | The screw clamps a bracket where the head has to sit inside a shallow counterbore. |
| When it goes wrong | The head stands proud, or the plating fails at the head edge. |
| Why it happens | The head height was taken from the hexagon table, and the counterbore is too shallow. |
| What we control | Head height taken from the Torx table; sample fitted into the bore. |
| Where it sits | The screw closes a panel assembled on a line with torque-controlled drivers. |
| When it goes wrong | The bits wear and the lobes round, or the head marks the panel. |
| Why it happens | A worn Torx bit was kept in service past its life, and the recess took the wear. |
| What we control | Bit size and change interval specified; sample driven on the line driver. |
Four points that decide whether a torx head cap screw fits its counterbore and takes its torque:
|
Head dimensioned to one standard
The drawing uses the Torx cap head dimensions, not the hexagon ones, because the head heights differ. Basis: Head matched to the bore. |
Recess cut, then plated
The recess is cut to size and checked with the bit after plating, so the film is inside the measurement. Basis: Bit fits the finished part. |
|
Driven at joint torque
The first article is driven at the torque the line uses, and the lobes are inspected afterwards. Basis: Drive proved at torque. |
Same head every lot
Head height, recess depth and plating thickness are recorded with the drawing revision, so a repeat lot fits the same bore. Basis: Same fit across lots. |
The drive on these parts is efficient enough that its limits show up late. These four points are what keeps a part that drives well on the bench from failing in a counterbore that was cut for a different head.
These screws are cold headed from carbon steel wire, with the cap head formed and the Torx recess struck in the same operation, the thread rolled, and the parts nickel plated. The first piece of every run is measured on head diameter and height, recess, thread and length, and driven with the bit.
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The recess is formed by the punch that shapes the head, so its depth is fixed by the tool and the head height. That is why a head specified to the wrong table produces a recess that is either too shallow for the bit or too deep for the head.
Plating follows the rolling. Nickel builds inside the lobes, and on a small recess the film is enough to change the fit, so the recess is gauged with the bit on the plated parts rather than on the blanks.
The head face is checked for flatness after plating. On a cap head the bearing face carries the clamp, and a face that is slightly dished contacts the part on its rim, which is a defect that shows as a bright ring around the screw.
What decides whether a batch of torx head cap screws passes is the head that fits its bore, the recess that takes the bit and the thread that carries the clamp. The inspection agreement covers all three.
Head and recess on the projector |
Thread checked with gauges |
Material and class checked |
Salt-spray testing of the plating |
The head is measured for diameter and height against the Torx cap head table, and the sample is fitted into the counterbore. A head that is a tenth over on height is a head that will not sink into the bore.
The recess is measured for depth and lobe form and driven with the bit at the joint torque. The lobes are inspected after the drive, since a star that is slightly shallow works once and rounds on the second assembly.
The thread is gauged and, where a class is specified, the mechanical properties are checked on the sample. On a steel part the class is part of the joint design rather than a formality.
Every batch of torx head cap screws is traceable to the wire, the heading lot and the plating lot. The material certificate states the grade, the heat number and the mechanical properties; the plating record carries the coating thickness and the lot.
ISO 9001:2015 |
RoHS test report |
Registered trademark |
Patent: security screw and driver |
With each shipment we supply the material certificate, the inspection record for the head, recess and thread, and the plating record. The records carry the batch number, so a repeat order can be compared with the first on the head height that has to fit the counterbore.
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 torx head cap screw the first article is driven with the customer’s bit and fitted into the counterbore, because both the drive and the head height are judged in place. Buyers visit during the process to review samples.
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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 heading cells 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 |
The lobes have rounded roots, so the same torque fits in a smaller recess and leaves more material in the head.
No. The Torx cap head has its own head dimensions; height and diameter differ from the hexagon socket table.
Nickel builds inside the lobes. The recess is checked with the bit after plating, not before.
No. A Torx recess takes only its own bit size, and any other tool rounds the lobes.
The class the joint needs for preload, since the head is sized to carry it.
The standard the head is made to, thread and length, Torx size and depth, property class, finish, and the counterbore it fits.
How a torx head cap screw project runs from drawing to repeat delivery:
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1
Send the drawing and the counterbore sample
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→ |
2
Head, recess and class agreed
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→ |
3
First article fitted and driven
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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 used for the first article is what repeat orders are checked against.
For a quotation, send the drawing with the head standard and dimensions, thread and length, Torx size and depth, property class and finish.
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Head
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Torx size
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Thread
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Class
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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
