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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:Phillips Oval Head Screws
Materials:Stainless Steel
Surface treatment:Plain
Head Type:Oval head
Drive:Phillips Cross
Thread:Machine Thread
Point:Blunt
Forming:Single Die Heading
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:640
We make Phillips oval head screws in passivated stainless, a raised countersunk head with a cross recess and a shallow cone, quoting them from M1 to M14. Cone depth, head height, recess and thread come from your drawing, and the first article is fitted 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.
A Phillips oval head screw is a machine screw with a countersunk cone under the head and a dome above it, driven by a cross recess. The cone seats in the countersink like a flat head, while the dome stands proud and covers the rim of the hole. This family is made in passivated stainless, quoted from M1 to M14 with Number 640 and filed against the ISO oval head form.
Oval head. A raised countersunk head: the same cone underneath as a flat head, with a dome on top instead of a flat face.
Cross recess. A Phillips recess cut into the dome, sized so the driver cams out before the head is destroyed.
Machine thread. A rolled thread for a tapped hole or a nut, ending in a blunt chamfer.
Plain stainless. Passivated and uncoated, so the cone, the dome and the recess are all as made.
In practice a Phillips oval head screw is chosen when the panel is too thin for a flat countersink, or when the face has to look finished without being flat.
An oval head is judged by its dome and specified for its cone. Because the dome takes up part of the head height, the cone under an oval head is shallower than the cone under a flat head of the same diameter — which means the countersink cut in the panel is shallower too, and less material is removed from the sheet at the most critical point.
On a thin panel that difference decides whether the joint is possible. A full countersink in a 1 mm sheet leaves very little thickness under the head; a shallower countersink leaves more, and the oval head still presents a closed dome over the rim. That is the practical reason the form survives: it is the countersunk head you can use where a flat one would break through.
The dome does a second job on imperfect holes. Where a countersink is slightly oversize, a flat head leaves a visible ring of bare metal or paint around it; an oval dome covers that ring, because the dome is wider than the cone at the point where it meets the surface. On reworked holes and on panels that have been repaired, that forgiveness is worth more than the flat face.
The cost is the projection. An oval head stands above the panel by the height of its dome, so anything sliding over the surface will find it, and the head has to be allowed for in the clearance above the panel. It is a decorative fixing as much as a flush one, and it is chosen where a little relief is acceptable and a ring of bare metal is not.
Stainless suits the form because the dome is the visible part. With no coating, the finish is the alloy, and a stainless dome that is handled and washed keeps its appearance while a plated one wears through at the crown where fingers and cloths work hardest. The one behaviour to plan for is galling against stainless, which a dry-film lubricant on the thread resolves.
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 a Phillips oval head screw the quotation carries head diameter, total head height, cone depth, recess size and the thread, because the cone depth is what the panel has to give.
| Item | How it is defined | What we control |
|---|---|---|
| Head | Oval head, dome over cone | Head diameter, total height, dome form |
| Cone | Countersunk seat underneath | Cone angle and cone depth |
| Recess | Phillips cross in the dome | Recess size and depth |
| Thread | Machine thread | Pitch and length, gauged per batch |
| Finish | Passivated stainless | Surface condition and film |
| Length | Overall, head included | Measured on the shop plate |
Cone depth is the number to put on the drawing if the panel is thin. It is not the same as head height, and a drawing that gives only the total height leaves the customer guessing how much material the countersink has to remove. Where the sheet is thin, that is the number that decides whether the part can be used at all.
Length is measured over the whole screw, head included, as on any countersunk part. The dome adds to the overall height above the panel but not to the length in the joint, so a designer switching from a flat head should expect the same length to work and a small extra projection on top.
Three features define this part: the dome, the shallow cone and the stainless body. The first covers the rim and gives a finish, the second removes less material from the panel, and the third keeps both looking right in service.
| Feature | What it gives | What it costs |
|---|---|---|
| Dome | Covers an oversize countersink | Stands proud of the surface |
| Shallow cone | Less material removed from thin sheet | Less bearing depth in the panel |
| Cross recess | Common bit, defined cam-out | Cam-out marks a visible dome |
| Machine thread | Repeatable clamp in a tapped hole | Needs a tapped hole or nut |
| Plain stainless | No coating to wear at the crown | Galls against stainless |
The trade between the two features is the design decision. The shallow cone is a favour to the panel; the proud dome is a cost to the surface. Where the panel is thick enough for a full countersink, a flat head does the same job with nothing standing above the surface, and the oval head is chosen for appearance rather than necessity.
The recess is the weakest point on the dome. A dome has material at its crown, so the cross is reasonably deep, but a cam-out runs across the top of a curved surface and is more visible there than on a flat head. A driver in good condition and a joint that does not need excessive torque are what keep the dome looking new.
The recorded finish is passivated stainless, with no coating. On an oval head that is the honest choice: the dome is the part that is seen and touched, and any plating would wear off the crown first, leaving a bright patch on the most visible part of the fastener.
| Option | How it protects | Effect on dome and cone | Typical use |
|---|---|---|---|
| A2 stainless, passivated | Passive chromium oxide film | Dome and cone as made | Outdoor facing panels |
| A4 stainless, passivated | Passive film with molybdenum | Dome and cone as made | Coastal and marine |
| Steel, nickel plated | Barrier deposit, bright | Crown wears first | Indoor decorative work |
| Steel, white zinc | Sacrificial zinc | Zinc protects beside wear | Indoor painted panels |
| Brass, plain | Alloy resists corrosion | Warm tone, soft surface | Instruments and fittings |
Where the joint is indoors and the head is decorative, nickel or brass gives the look with less cost than stainless. Where the joint is outside — a facing panel, a marine fitting, a canopy — stainless is the only version that keeps its appearance through a season of weather, and the dome is exactly where a coating would fail first.
The finish also has to survive handling during assembly. A dome that has been gripped by pliers, or turned with a driver that slipped, shows every mark, and on a plain stainless part those marks are permanent. Handling the screw by the thread rather than the head is the cheapest protection there is.
Three assemblies where Phillips oval head screws are the fixing:
| Where it sits | The screw fixes a facing sheet where a flat countersink would leave too little material under the head and the fixing is on show. |
| When it goes wrong | A full countersink breaks through or leaves a razor-thin skin, and an oversize hole shows a ring of bare metal. |
| Why it happens | The sheet is thin, the face is visible, and the head has to cover the hole. |
| What we control | Cone depth checked, first article fitted into the panel. |
| Where it sits | The screw fixes a fitting, a plate or a trim where the head is exposed and the surface will be washed. |
| When it goes wrong | A plated dome wears through at the crown and rusts where it shows most, and a galled thread cannot be opened. |
| Why it happens | The joint is wet, the head is visible, and the material must not rust. |
| What we control | Grade confirmed, dome and cone checked, passivation inspected. |
| Where it sits | The screw closes a cover where the fastener is part of the design and a raised head is the intended look. |
| When it goes wrong | A marked or worn dome is an appearance defect, and a shallow recess can strip at assembly. |
| Why it happens | The fixing is decorative, it is handled, and the finish is the point. |
| What we control | Dome form and recess checked, first article reviewed on the assembly. |
Four reasons that matter on a visible countersunk head, each tied to what the drawing has to prove:
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Cone depth and panel agreed
The cone depth and the panel thickness are confirmed together, because the reason to use an oval head is usually that a full countersink would remove too much material. Basis: Cone depth and panel agreed in writing. |
Head, cone and recess in one route
The dome and the cone are formed in the heading stroke with the cross recess, and the thread is rolled below. Basis: One route from wire to passivated screw. |
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Dome and cone measured on the finished part
The first article is checked for total height, cone depth and recess, then fitted to the customer panel, because the seat is what the joint is judged on. Basis: First article fitted to the panel. |
First article fixes the setting
The first article fixes the wire, the head die 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 oval head screws from stainless wire on single-die headers that form the dome, cut the countersunk cone underneath and cut the cross recess in the same stroke, then rolls the machine thread and passivates the finished parts. The first part of every run is measured on the head and cone, driven with the production bit and entered into a thread gauge before the batch continues.
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An oval head is harder to form than a flat one because two surfaces matter at once: the cone underneath sets the seat and the dome above sets the look. A die that is slightly worn flattens the dome or shallows the cone, and the two failures look similar in a tray and behave differently in a panel.
What decides whether Phillips oval head screws pass is the dome, the cone, the recess and the thread. The inspection agreement covers those, and the criteria come from the drawing.
Dome and cone on the projector |
Thread gauged per batch |
Hardness checked on the wire |
Salt-spray testing of the grade |
The head is checked for diameter, total height and dome form on the projector, and the cone for angle and depth against a countersink gauge. The recess is checked for depth and driven with the production bit, because a cam-out on a dome is more visible than on a flat face.
The thread is gauged per batch and the alloy is confirmed on the certificate. The first article is fitted to the customer’s panel, since the question on this part is always whether the dome closes the hole cleanly on that sheet thickness.
Every shipment of Phillips oval head 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 a repeat order is made to the same head 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 countersunk part the first article is fitted into the customer’s panel, because the seat and the dome together decide whether the fixing looks right. Buyers visit during the process to review samples and to see how the heads are formed.
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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 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 raised countersunk head: a countersunk cone underneath with a dome on top. It seats like a flat head and covers the hole rim with the dome.
Because the cone is shallower, so less material is removed from the panel, and the dome covers an oversize or imperfect countersink.
No. The cone seats flush but the dome stands above the surface by its height, which has to be allowed for in the clearance above the panel.
Over the whole screw, head included. The dome adds height above the panel but not length in the joint.
For outdoor or washed joints, yes — the dome is what shows, and a plated dome wears at the crown. Indoors, nickel or brass may suit the design better.
Thread size and length, head diameter, total height, cone depth and angle, the recess type and the grade.
How a Phillips oval head screw project runs from drawing to repeat delivery:
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1
Send the drawing and the panel it seats in
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→ |
2
Cone depth, head height and thread agreed
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→ |
3
First article fitted into 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 thread size and length, the head diameter and total height, the cone depth and angle, the recess type and the grade.
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Thread size
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Length
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Head diameter
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Total height
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Cone depth
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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
