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 Cap Screws
Materials:Carbon steel
Surface treatment:Yellow Zinc Plated
Head Type:Cap Head
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10
Drive type:Torx (internal)
Thread:Machine thread
Forming:Single-die cold heading
Number:1580
We manufacture torx socket cap screws in carbon steel with a cap head, an internal Torx recess and yellow zinc plating, from M1 to M10. Head, Torx size and depth, thread class and plating are checked in the plated condition before the batch ships.
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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 socket cap screw is a cap head screw driven with a Torx star key instead of a hex key or a cross. The one on this page is carbon steel, yellow zinc plated, with a cap head, an internal Torx recess and a machine thread, in sizes M1 to M10.
Torx recess. The star has six lobes and flat flanks, so the key engages over a larger area than a cross and cams out less. That is what lets a cap head of a given size take more torque without rounding the recess.
Cap head. The head is a cylinder with a flat top and a straight side wall. It gives a high clamp load from a compact head, and it seats on the panel with a full bearing face rather than a narrow edge.
Yellow zinc. The parts are zinc plated with a yellow passivation. The coating protects the carbon steel sacrificially, and it builds a few microns in the Torx recess and on the thread, so both are checked after plating.
Together these decide the joint: the star takes the torque, the cap head carries the clamp load, and the plated thread still gauges to the drawing.
This screw is formed from carbon steel wire on a single-die header, thread rolled and yellow zinc plated. The grade comes from the drawing, and the wire heat number stays traceable to the material certificate.
The cap head and the Torx recess are formed in the die. The recess sits in the middle of the flat top, and the wall around it is what carries the driving torque; a recess that is too deep or off centre breaks through or rounds on one side.
The thread is rolled before plating. Yellow zinc adds a few microns to the thread and to the recess, so the thread is gauged and the recess checked with the Torx key after the bath, in the condition the customer assembles.
On higher-strength carbon steel, plating also brings a hydrogen risk; where the drawing calls for a high strength class, the baking step after plating is agreed and recorded with the batch.
Torx socket cap screws of this type are quoted from M1 to M10 and in lengths to suit the drawing, with the head and the recess 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 and height | The cap head that bears on the panel | Checked on the projector on the first article |
| Torx size and depth | The key that drives the screw | Checked with the key and on the projector |
| Thread size and length | Machine thread to the drawing | Gauged after plating |
| Plated dimensions | Head, recess and thread read after plating | Measured again after yellow zinc |
| Head edge | The rim that seats on the panel | Checked for burrs on the first article |
| Total length | From the top of the head to the tip | Datum stated on the drawing; measured on the shop plate |
Each size is quoted against the joint it closes. The head diameter, the recess depth and the thread class are reviewed together, because a head that is large enough for the recess may not fit the counterbore the panel has.
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 depth, head diameter and thread class, all read after plating.
The Torx recess is the drive of a torx socket cap screw. Its six lobes and flat flanks spread the 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 key has to be the right size and fully seated. A key one size down rocks in the lobes and rounds them; 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 cap head works with the recess. Its straight wall gives the recess a full-depth seat, and its flat top gives the key a square reference. A domed head would move the key off axis as the torque comes on, which is why cap and Torx are a common pair.
After plating the recess is tighter by a few microns. The key is tried in the plated part, because a recess that is right before the bath can be a tight fit after it, especially on the smaller sizes.
This torx socket cap screw is yellow zinc plated. The zinc layer protects the carbon steel sacrificially, so a scratch at the head or in the recess does not start rust immediately, and the yellow passivation gives the finish its colour.
| Finish | How it protects | Effect on recess and thread | Typical use |
|---|---|---|---|
| Yellow zinc | Zinc layer with yellow passivation | Build-up in recess; key checked after | Indoor machinery and electrical parts |
| Clear zinc | Zinc layer, clear passivation | Same build-up; checked after | Parts where a bright finish is wanted |
| Black oxide | Conversion coating, minimal thickness | No measurable build-up | Indoor parts where black is required |
| Zinc-nickel | Zinc alloy layer, higher corrosion resistance | Build-up; key and thread checked after | Automotive and damp service |
| Dacromet flake | Zinc-aluminium flake layer | Thin film; recess checked over coating | Outdoor and wet assemblies |
Salt-spray exposure is agreed per project and written on the drawing, and the plated parts are tested in the condition they ship in. On this part the recess is the face that matters: a coating that fills the star changes the key fit even when the head looks correct.
Packing protects the heads and the recesses. Screws are packed in layers so the heads do not rub and the recesses stay clear of debris, and the label carries the batch, the heat and the plating lot.
Three assemblies where torx socket cap screws are chosen for the drive and the clamp load, and what the screw has to do instead:
| Where it sits | The screw clamps a plate or a bracket where the head has to sit in a counterbore and the key has to take real torque. |
| When it goes wrong | A cross would cam out at the torque the joint needs, and a plated recess that is too tight stops the key going in. |
| Why it happens | The joint is structural, the screws are small, and the assembly is driven with a torque tool. |
| What we control | Recess key-checked after plating, and the thread gauged per batch. |
| Where it sits | The screw closes a cover or a busbar joint where the head must be compact and the drive must not slip. |
| When it goes wrong | A rounded recess leaves the joint loose, and a coating that fills the star slows the line. |
| Why it happens | The parts are indoors, the joints are repeated, and the screws are driven by power tools. |
| What we control | Torx size and depth checked, and the plating lot recorded with the batch. |
| Where it sits | The screw holds a bracket or a cover where vibration would work a cross-drive loose and the head has to be low. |
| When it goes wrong | A key that rocks rounds the lobes, and a high-strength part plated without baking can crack after assembly. |
| Why it happens | The joint vibrates, the parts are plated, and the screws are torque-controlled. |
| What we control | Baking recorded where the class requires it, recess checked, and the thread gauged. |
Four reasons that matter on a torx socket cap screw, each tied to what the drawing has to prove:
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Head and recess reviewed together
The cap head diameter, the Torx size and the recess depth are reviewed before the die is cut, so a head that would open or a recess that would round is raised first. Basis: Head and recess reviewed before tooling. |
Headed, threaded and plated in one flow
The head and recess are formed in the die, the thread is rolled, and the parts go to yellow zinc as a batch, so the recess and the thread come from the same run. Basis: Heading and plating recorded per batch. |
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Key-checked after plating
The recess is checked with the Torx key and the head on the projector after plating, so the part that passes is the part the key engages. Basis: Recess and head measured in the plated condition. |
First article to repeat production
The first article fixes the drawing revision, wire heat, die set and plating lot; repeat orders are compared against that record. Basis: First article signed off before the batch is released. |
Shi Shi Tong forms these torx socket cap screws on a single-die header: the cap head and the Torx recess are struck in the die, the thread is rolled, and the parts are yellow zinc plated. The first part of every run is measured on the head, checked with the Torx key 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 Torx size; the first parts go to the projector and the key check before the run continues, and the setting is recorded. Plated parts are checked again after the bath, so the record covers both the formed and the plated condition.
What decides whether a torx socket cap screw passes is not the colour of the zinc: it is the head diameter and height, the Torx size and depth, the head edge and the thread class. The inspection agreement covers those, and the criteria come from the drawing.
Head and recess on the projector |
Thread gauging after yellow zinc |
Hardness testing where the drawing requires it |
Salt-spray testing of the yellow zinc finish |
Each batch is recorded against the drawing revision: head and recess from the first article, the key fit checked, and the thread gauged after plating. If a gauge or the key check fails, the parts back to the last good setting are held and re-checked.
Where a third-party report is required for the material or the plating, it is listed on the drawing so the paperwork ships with the parts, and the batch number on the label matches the record used for inspection.
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 plating. 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. Torx parts are approved with the key, so the recess and the tool are signed off as a pair. 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 header 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 |
It is a cap head screw with an internal Torx star recess, driven with a Torx key. This one is carbon steel with yellow zinc plating, from M1 to M10.
The star has six lobes and flat flanks, so the key engages over a larger area and cams out less. A torx socket cap screw takes more torque for its head size without rounding the recess.
Torx socket cap screws of this type are quoted from M1 to M10 and in lengths to suit the drawing. Where a long version is required, custom lengths up to 2,000 mm are subject to DFM review after drawing submission.
Yes. Yellow zinc builds a few microns in the star and on the thread, so the key is checked and the thread gauged after plating, in the condition the customer assembles.
Where the drawing calls for a high strength class, the plating and baking step is agreed and recorded with the batch, because plating can introduce hydrogen into high-strength steel.
Head diameter and height, Torx size and depth, thread size and length, total length and datum, material and strength class, plating and quantity.
How a torx socket cap screw project runs from drawing to repeat delivery:
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1
Send the drawing or sample
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2
Head and recess 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 socket cap screw quotation, send the drawing with the head diameter and height, Torx size and depth, thread size and length, total length and datum, material and strength class, and the plating specification.
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Head diameter and height
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Torx size and depth
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Thread size and length
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Total length and datum
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Material and strength class
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Plating and quantity
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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
