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+86 13143444311
Email：sst@szsst88.com
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Address：Building 9, First Industrial Zone, Tantou Industrial City, Songgang Street, Baoan District, Shenzhen 518105, Guangdong, China
Type:stainless steel torx head machine screws
Materials:Stainless steel
Surface treatment:Plain
Head Type:Truss
Drive type:Torx (internal)
Thread:Machine thread with dog point
Forming:Single-die cold heading with turned dog point
Number:1741
We manufacture torx head machine screws in stainless steel with a truss head, an internal Torx recess and a dog point, plain and passivated, made to drawing. Head diameter, Torx size, dog point, thread class and finish are settled before the batch runs.
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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.
A torx head machine screw is a machine screw driven with a Torx (star) key instead of a Phillips or a hex key. The one on this page also has a truss head and a dog point: a wide, low head that spreads the load over a thin panel, and an unthreaded tip that starts the screw straight in its hole.
Torx recess. The star recess has six lobes and a flat drive flank, so the key engages over a larger area than a cross and cams out less. That is why a torx head machine screw takes more torque for its size without rounding the recess.
Truss head. The head is wide and low, with a large bearing face that sits on the panel. It spreads the clamp load over thin sheet, plastic or a soft gasket, and it keeps the profile low where a standard pan head would stand too tall.
Dog point. The tip is an unthreaded cylindrical point, turned after the thread is rolled. It enters the hole and aligns the screw before the first thread engages, which keeps a small stainless screw from cross-threading at assembly.
Together these decide the joint: the star takes the torque, the truss head bears on the panel, and the dog point starts the screw straight.
This screw is formed from stainless wire on a single-die header, thread rolled, dog-pointed and supplied plain and passivated. The grade comes from the drawing, with 303, 304 and 316 the common choices.
The truss head and the Torx recess are formed in the die. The head diameter is wide relative to its height, which is what gives the truss head its bearing area; the recess sits in the middle and is sized to the Torx bit the line uses.
The thread is rolled before the dog point is turned. Turning the point after rolling keeps the first thread full and leaves a clean cylindrical lead, so the screw starts in the hole without a burr or a rolled-over thread at the tip.
Plain stainless keeps every dimension the process produced. Passivation restores the chromium film without adding thickness, so the dog point diameter and the thread class stay as they were measured.
Screws of this type are quoted from M2 to M8 and in lengths up to 100 mm, with the truss head measured on the projector and the thread gauged. Where a long version is required, custom lengths up to 2,000 mm are subject to DFM review after drawing submission.
| Item | How it is defined | What we control |
|---|---|---|
| Head diameter | The wide truss head bearing face | Checked on the projector on the first article |
| Head height | The low profile above the panel | Checked against the drawing |
| Torx recess | T size matched to the bit | Checked with the bit and on the projector |
| Dog point | The unthreaded cylindrical tip | Measured and checked on the projector |
| Thread size and length | Machine thread to the drawing | Gauged per batch |
| Total length | From the top of the head to the point | Datum stated on the drawing; measured on the shop plate |
Each size is quoted against the joint it closes. On a thin panel the truss head is what keeps the sheet from denting, and the dog point is what keeps a small screw from starting crooked, so head diameter and point diameter are both reviewed with the panel.
Head height is measured from the bearing face and the total length from the top of the head. The batch is checked on the features the process can drift on: recess size, head diameter and thread class.
The Torx recess is the drive of a torx head machine screw. Its six lobes and flat flanks spread the driving load over a larger area than a Phillips cross, so the same head size can take more torque before the recess deforms. The recess is cut to the T size on the drawing and checked with the bit that will be used.
A Torx bit has to be the right size and fully seated. A bit one size down rocks in the lobes and rounds them, and a bit one size up will not enter; both failures show as polished flats in the star, which is exactly the surface that carries the torque.
The dog point is the other half of the start. It is a short unthreaded cylinder at the tip, smaller than the thread minor diameter, that enters the hole and centres the screw before the thread bites. On a tapped hole with a chamfer, the point finds the chamfer and the thread follows.
Turning the point after thread rolling is what makes the dog point clean. If the point is cut before rolling, the roll can push material into the lead; turning after rolling leaves the first thread sharp and the point concentric.
This torx head machine screw is supplied plain and passivated. There is no coating to build in the Torx recess or on the dog point, so the bit fit and the starting diameter stay as they were measured, and the part can be assembled without re-checking the tool.
| Finish | How it protects | Effect on recess and thread | Typical use |
|---|---|---|---|
| Plain, passivated stainless | Alloy resists corrosion; passive film restored | No build-up; bit fit unchanged | Wash-down, food and lab equipment |
| Electropolished | Surface levelled, chromium enriched | Recess edges softened; bit re-checked | Hygienic and visible parts |
| Black oxide (carbon steel) | Conversion coating, minimal thickness | No measurable build-up | Indoor carbon steel equivalents |
| Zinc plated (carbon steel) | Sacrificial zinc layer | Build-up in recess; bit checked after | Carbon steel parts where cost matters |
| Dacromet flake (steel) | Zinc-aluminium flake layer | Thin film; recess checked over coating | Outdoor carbon steel parts |
Salt-spray exposure is agreed per project and written on the drawing; plain stainless is tested in the condition it ships in. On this part the recess is the face that matters: a coating that fills the star changes the bit fit even when the head looks correct.
Packing protects the head and the point. Screws are packed so the truss heads do not rub and the dog points are not bent, and the label carries the batch and the material heat.
Three assemblies where torx head machine screws are chosen for the drive and the clean start, and what the screw has to do instead:
| Where it sits | The screw closes a guard or a cover on a machine that is washed down, where the head has to be cleanable and the drive must not strip. |
| When it goes wrong | A Phillips cross fills with food residue, and a rounded recess stops the line at the next service. |
| Why it happens | The equipment is washed, the covers come off daily, and the fasteners are stainless. |
| What we control | Torx recess checked with the bit, plain finish kept cleanable, and the thread gauged per batch. |
| Where it sits | The screw holds a panel or a module where the drive is small and the head has to sit low on a thin cover. |
| When it goes wrong | A truss head that is too small dents the cover, and a screw without a point starts cross-threaded in a blind hole. |
| Why it happens | The panels are thin, the parts are small, and the screws are driven by hand or with a torque driver. |
| What we control | Truss head diameter and dog point checked, and the recess matched to the driver bit. |
| Where it sits | The screw closes a cover where a wide low head spreads the load and a Torx drive resists cam-out on a powered driver. |
| When it goes wrong | A cam-out at speed damages the recess and the surrounding board, and a head that is too tall fouls the next module. |
| Why it happens | The covers are assembled with power tools, the parts are small, and the joints are re-opened. |
| What we control | Recess size and head height checked, and the thread gauged after passivation. |
Four reasons that matter on a torx head machine screw with a truss head and a dog point, each tied to what the drawing has to prove:
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Recess, head and point reviewed together
The Torx size, the truss head diameter and the dog point diameter are reviewed before the die is cut, so a screw that would cam out or start crooked is raised first. Basis: Recess, head and point reviewed before tooling. |
Headed, threaded and pointed in one route
The head and recess are formed in the die, the thread is rolled and the dog point is turned after rolling, so the point stays concentric and the first thread stays sharp. Basis: One route for head, thread and dog point. |
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Recess checked with the bit
The recess is checked with the Torx bit, the head and point on the projector, and the thread gauged, on the first article and per batch. Basis: Bit fit, head and point checked on the first article. |
First article to repeat production
The first article fixes the drawing revision, wire heat, die set and point tool; repeat orders are compared against that record. Basis: First article signed off before the batch is released. |
Shi Shi Tong forms these torx head machine screws on a single-die header: the truss head and the Torx recess are struck in the die, the thread is rolled, the dog point is turned after rolling, and the parts are passivated. The first part of every run is measured on the head, checked with the Torx bit and gauged on the thread before the batch continues.
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Between runs the die insert is changed to the drawing head and the recess punch to the T size; the first parts go to the projector and the bit check before the run continues, and the setting is recorded. The dog point is turned in a fixtured step and its diameter is recorded with the batch.
What decides whether a torx head machine screw passes is not only the thread: it is the truss head diameter and height, the Torx recess size, the dog point diameter and the thread class. The inspection agreement covers those, and the criteria come from the drawing.
Thread gauging against GO/NO-GO gauges |
Head, recess and dog point on the projector |
Hardness testing where the drawing requires it |
Salt-spray testing of the passivated part |
Each batch is recorded against the drawing revision: head, recess and point from the first article, the bit fit checked, and the thread gauged per batch. If a gauge or the bit check fails, the parts back to the last good setting are held and re-checked.
Any outside test the drawing calls for is commissioned with the batch, and the report is filed under the same number as the inspection record.
Every shipment is traceable to the wire it was made from. The grade, heat number and standard 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 or the finish. 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. Parts with a dog point are approved with the hole they start in, so the point and the chamfer are signed off as a pair. Buyers visit during the process to review samples and to see how the heads and points are produced.
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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 point-turning cell 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 |
It is a machine screw driven with a Torx star key instead of a Phillips or hex key. This one has a truss head, an internal Torx recess and a dog point.
The star has six lobes and flat flanks, so the key engages over a larger area and cams out less. A torx head machine screw takes more torque for its head size without rounding the recess.
It is a short unthreaded cylindrical tip below the thread. It enters the hole and centres the screw before the first thread engages, which prevents cross-threading at assembly.
Screws of this type are quoted from M2 to M8 and in lengths up to 100 mm. Where a long version is required, custom lengths up to 2,000 mm are subject to DFM review after drawing submission.
The T size on the drawing, matched to the bit on the line. The recess is checked with that bit after passivation, because a bit that is one size off rounds the lobes.
Head diameter and height, Torx size and depth, dog point diameter and length, thread size and length, total length and datum, material and finish.
How a torx head machine screw project runs from drawing to repeat delivery:
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1
Send the drawing or sample
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2
Recess and point review
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→ |
3
First article approval
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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 torx head machine screw quotation, send the drawing with the head diameter and height, Torx size and depth, dog point diameter and length, thread size and length, total length and datum, material and finish.
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Head diameter and height
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Torx size and depth
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Dog point diameter and length
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Thread size and length
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Total length and datum
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Material and 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
