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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:Phillips Self Tapping Screws
Materials:Stainless Steel
Surface treatment:Plain
Head Type:Pan Head
Drive:Phillips
Thread:Half Thread Self Tapping
Point:Gimlet Point
Forming:Single Die Heading
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:709
We make phillips self tapping screws in passivated stainless with a pan head, a cross recess, a half thread and a gimlet point, quoting them from M1 to M14. Recess, thread, point and grade come from your drawing, and the first article is driven into your own panel.
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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.
Phillips self tapping screws form their own thread in a drilled or punched hole and are driven with a cross bit, in this form with a pan head, a half thread and a sharp point. The recorded item is stainless steel with a plain finish, quoted from M1 to M14 with Number 709.
Cross recess. Four tapered wings around a pointed centre. The bit centres itself and cams out when the torque reaches what the wings can hold — a warning built into the drive.
Half thread with a sharp point. Thread from the point to a defined position, with a plain shank under the head and a gimlet tip that bites and starts its own hole in soft material.
Pan head. A low dome on a flat bearing face, wide enough to spread the load and low enough to stay inside its own diameter.
Stainless, plain. Passivated and uncoated, so the recess is exactly as formed and the thread has no film to change the fit in the hole.
A cross recess is not a weak design; it is a limiting one. The tapered wings cam out when the torque passes what they can transmit, and that happens before a Phillips self tapping screw strips a thin sheet or twists its head off. On a stainless joint, where the sheet work-hardens and the driving torque climbs, that limit is doing useful work.
The cost of the limit is the recess itself. Every cam-out removes material from the wings, and on a stainless head the damage is permanent — the wings do not spring back. A screw that cams out once is a screw that will cam out at a lower torque the next time, and after two or three events the recess is unusable.
That is why the bit matters more on this part than on a machine screw. A bit that is the right size, in good condition and fully seated transmits the torque the recess was designed for; a worn bit, or one a size too small, sits high and rounds the wings from the shoulder. The bright star a cam-out leaves on a stainless head is the signal to change the bit, not the screw.
The half thread and the sharp point belong to the other end of the joint. The gimlet starts in soft material and pulls the screw in, and the plain shank under the head passes the top member of a stack without cutting it. On a stainless screw into a stainless panel, both are working in a material that hardens as it is worked, so the hole size is what keeps the driving torque inside the recess’s limit.
Plain stainless is passivated after forming. There is no coating on the wings, so the wear is visible from the first turn, and no coating in the thread, so the crest that forms the panel thread is the crest that was rolled.
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 phillips self tapping screws the recess size, the thread length and the point are quoted with the length, because the recess is what limits the drive.
| Item | How it is defined | What we control |
|---|---|---|
| Head | Pan head, flat bearing face | Diameter, height and face flatness |
| Recess | Phillips cross | Depth and width, bit tried on the part |
| Thread | Self-tapping, half length | Thread length and position from the end |
| Point | Gimlet, sharp tip with a threaded lead | Point angle and lead length |
| Finish | Plain stainless, passivated | Surface condition and film |
| Length | From under the head to the point | Measured on the shop plate |
The recess size is quoted rather than left to the standard, because the bit the customer uses is the real specification. A recess a few hundredths narrow refuses a worn bit; one a few hundredths wide lets the bit rock, and a rocking bit rounds the wings faster than a seated one ever would.
Length is measured from under the head, because that face bears. On a half thread the thread length is quoted from the point independently, so the plain shank that clears the top member is a defined feature rather than a leftover.
Three features define this part: the cross recess, the half thread and the stainless body. The first sets the torque ceiling, the second lets the screw work in a stack, and the third is what makes it survive without a coating.
| Feature | What it gives | What it costs |
|---|---|---|
| Cross recess | Standard bit, cam-out as a warning | Cam-out damages the recess permanently |
| Half thread | Plain shank passes the top member | Thread length must be specified |
| Sharp point | Starts in soft material without a pilot | Skates on hard or thin sheet |
| Pan head | Load spread without a washer | Less area than a truss head |
| Plain stainless | No coating to chip or narrow the recess | Galls against stainless; pits in chloride |
The comparison that matters is with a star drive. A star socket transmits more torque without camming out, which suits a powered driver on a thin stainless panel; a cross recess deliberately gives up at a lower torque, which suits a joint that would otherwise be over-driven. The choice is about what should fail first.
The second comparison is with a machine screw. A tapping screw removes a tapping operation but ties the joint to the material it forms in; a machine screw needs a tapped hole and can be reopened indefinitely. Where a joint is opened more than a few times, the tapping screw is the wrong fastener and the machine thread is the right one.
The recorded finish is plain, passivated stainless. Nothing is added, so the recess and the thread are exactly as formed, and the protection is the alloy rather than a film that wears off the wings first.
| Option | How it protects | Effect on recess and thread | 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 |
| Stainless 410 | Passive film on a martensitic grade | Harder crest and point | Tapping harder sheet |
| Zinc plated steel | Sacrificial zinc | A few microns; recess re-checked | Indoor, cost-driven work |
| Black zinc on steel | Sacrificial zinc, dark passivation | A few microns; re-checked | Dark visible panels |
The grade question on a tapping screw is really a pairing question. A screw softer than the panel will not form a thread, and one of the same grade can gall on the way in; where the panel is stainless, a harder grade for the screw — or careful attention to the hole — is what makes the joint repeatable. The drawing should name the sheet as well as the screw.
The wet-service limit is the same one that applies to any austenitic part. A2 handles weather inland; where chloride is present the grade is the answer, and the certificate is the only evidence of it before the parts are in service.
Three assemblies where phillips self tapping screws are the fixing:
| Where it sits | The screw fixes a trim or a plate to a frame where the joint is exposed, the head is visible and the fixing is driven with a standard bit. |
| When it goes wrong | A plated screw rusts at the recess, and a recess that has cammed out cannot be tightened or removed. |
| Why it happens | The joint is outdoors, the fixing repeats, and the head is seen. |
| What we control | Recess driven with the production bit, thread and point tested in the customer material. |
| Where it sits | The screw closes a panel or fixes a bracket into a punched hole where the head has to cover the hole and the joint is made on a line. |
| When it goes wrong | A screw that does not cover its hole leaves a slot, and one that strips in thin sheet cannot be re-used. |
| Why it happens | The panel is thin, the hole is punched, and the fixing repeats. |
| What we control | Head diameter and recess checked, driving torque read in the customer sheet. |
| Where it sits | The screw fixes a component plate or a cover where the joint is serviced and the fixing is small and close to other parts. |
| When it goes wrong | A driver that slips marks the plate, and a recess that has filled with coating will not take the bit. |
| Why it happens | The enclosure is serviced, the panel is thin, and the fixing repeats. |
| What we control | Recess depth and width checked, thread gauged per batch. |
Four reasons that matter on a cross-drive tapping screw, each tied to what the drawing has to prove:
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Recess, thread and panel reviewed together
The recess size, the thread and the panel grade are reviewed as one set, so a recess that would cam out early or a thread that would strip is raised before the die is cut. Basis: Recess, thread and panel reviewed as one set. |
Heading, rolling and passivation in one route
The pan head and the cross are formed in one stroke, the half thread is rolled to a sharp point and the parts are passivated in the same route. Basis: One route from wire to passivated screw. |
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Recess driven, thread driven
The recess is driven with the production bit after passivation, and the thread is gauged and driven into the customer’s material. Basis: First article driven in the customer material. |
First article fixes the setting
The first article fixes the wire heat, the die set, the roll 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 phillips self tapping screws from stainless wire on single-die headers that form the pan head and the cross recess in one stroke, rolls the half thread and forms the gimlet point so the lead keeps its thread, then passivates the parts. The first part of every run is measured on the head, driven with the production bit and driven into a sample of the customer’s material before the batch continues.
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The cross punch is the tool that sets the torque limit. A worn punch leaves wings that are shallow where the bit drives, so the screw cams out earlier than the drawing allows — and in stainless that means a recess that rounds while the panel is still loose. The punch is checked on the first article and sampled through the run.
What decides whether phillips self tapping screws pass is the recess, the head, the thread, the point and the alloy. The inspection agreement covers those, and the criteria come from the drawing.
Head and recess on the projector |
Thread gauged per batch |
Hardness checked on the formed head |
Salt-spray testing of the stainless grade |
The recess is checked for depth and width and then driven with the production bit; on a stainless part the worn wings show as a bright star, which is also the earliest sign that a driver on the line has had its day.
The thread is gauged per batch and driven into the customer’s sheet, with the driving torque recorded. The point is checked for angle and for the length of its threaded lead, since a point that has been ground back gives a screw that needs pressure to start.
Every shipment of phillips self tapping 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 tapping screw the first article is driven into the customer’s own panel, so the recess and the thread are proved together. Buyers visit during the process to review samples and to see how the heads and threads are formed.
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8,678+
customers served
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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 |
A star carries more torque without camming out, which suits a powered driver. A cross gives up at a lower torque, which suits a joint that should not be over-driven.
The wings lose material and the recess is permanently damaged. On stainless, a screw that cams out once will cam out sooner the next time.
A gimlet point with a short threaded lead, for wood, board and soft polymers. It will skate on hard or very thin sheet.
In sheet yes, in soft board usually not. The hole size is agreed on a sample of the customer’s material rather than from a table.
It can. The cross recess is meant to cam out before the sheet strips, but a pre-damaged recess or a worn bit removes that protection.
Head diameter and height, recess size, thread size with its length and datum, point form, overall length, and the stainless grade.
How a phillips self tapping screw project runs from drawing to repeat delivery:
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1
Send the drawing and the panel sample
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→ |
2
Recess, thread and panel review
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→ |
3
First article driven in your panel
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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 recess size, the thread size with its length and datum, the point form, the overall length and the stainless grade.
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Head diameter
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Recess size
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Thread and datum
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Point form
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Overall length
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Stainless grade
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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
