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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:Raised Countersunk Head Screws
Materials:Steel
Surface treatment:Nickel Plated
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:375
We make raised countersunk head screws in nickel plated carbon steel with a domed top, a 90-degree cone, a Phillips recess and a machine thread, quoting them from M1 to M14. Dome height, head diameter, cone angle and thread come from your drawing, and the first article is seated in your countersink.
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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.
These raised countersunk head screws — oval head screws — have a countersunk cone under a shallow domed top, a Phillips recess and a machine thread, in nickel plated carbon steel, quoted from M1 to M14 with Number 375.
Raised countersunk head. A 90-degree cone with a low dome above it, so the screw seats in a countersink but keeps a rounded face on top.
Phillips recess. A cross cut into the dome and driven with a PH bit.
Machine thread. A rolled thread for a tapped hole or a nut, ending in a blunt chamfer.
Nickel plating. A bright barrier deposit over carbon steel, for visible indoor work.
Raised countersunk head screws sit between a flat head and a pan head: they still need a countersink, but they keep a rounded face above it. That combination is what furniture and instrument work reaches for when the fixing is part of the appearance.
An oval head is a flat countersunk head with more material kept on top. The cone still seats in a countersink and still carries the clamp, but instead of finishing flat the head keeps a shallow dome, so the screw sits in its seat with a rounded face standing a fraction above the surface.
On raised countersunk head screws that extra material is the reason the form exists. A flat countersunk head is thin at its edge, and on a hard or uneven seat the cone can cut in or rock; an oval head has more head above the cone, so the face is stronger and the edge better supported. The cost is height: the dome stands proud, which rules it out of any joint where the surface has to be continuous.
On raised countersunk head screws the profile also changes how the head looks. A flat head reads as a machined surface, while an oval head reads as a rounded screw head — which is what many furniture and instrument designs want. That is why the same fastener is chosen for appearance as often as for strength.
For raised countersunk head screws the seat still governs the joint. The cone angle and the countersink angle have to match, and the depth has to let the cone land on its face; if the countersink is too shallow the head stands tall on the dome and on the cone edge, and the joint looks wrong and feels loose. On an oval head that error is easier to see than on a flat one.
Nickel is the finish that suits it. A barrier deposit keeps the dome bright and even, and on a rounded face that evenness is what the eye reads; a thin coating also keeps the cross recess usable, which on a small oval head is the limit on torque.
The recorded range is M1 to M14, with lengths made to the drawing. Custom lengths up to 2,000 mm are subject to DFM review after drawing submission. For raised countersunk head screws the quotation carries head diameter, cone angle, dome height, overall length, recess and finish, because the head profile is the specification.
| Item | How it is defined | What we control |
|---|---|---|
| Head | Raised countersunk, domed | Head diameter and dome height |
| Cone | 90-degree seat | Cone angle and contact |
| Length | Overall, head included | Length tolerance and end chamfer |
| Recess | Phillips cross | Recess size and depth |
| Thread | Machine thread | Pitch, length and gauging |
| Finish | Nickel plated | Thickness and recess fit |
| Seat | Countersink in the part | Angle and depth matched to the head |
For raised countersunk head screws the dome height is the number that decides whether the head is acceptable. A cover that passes over the fixing needs to know how high the dome stands; a design that assumes a flat head will foul an oval one by that amount.
Cone angle is the functional number. A 90-degree head in an 82-degree countersink seats on its edge and rocks, and on an oval head the dome then tilts visibly.
Three features define the part: the dome, the cone and the nickel finish. The first gives the look and the extra head material, the second seats and centres it, and the third keeps the face presentable.
| Feature | What it gives | What it costs |
|---|---|---|
| Domed top | A rounded, finished face | Stands above the surface |
| More head material | Stronger face than a flat head | Height to allow for |
| Cone seat | Centres the screw as it tightens | Angle and depth must match |
| Phillips recess | Common drive | Cam-out with a worn bit |
| Nickel plating | Bright barrier finish indoors | A scratch becomes a rust point |
The rounded face is the reason raised countersunk head screws are chosen on furniture and instruments. Where the fixing is seen and has to read as part of the design, a flat head can look like a cut while an oval head looks like a screw.
The height is the reason it is not universal. Anything that slides or seals over the fixing needs a flat head, and on those joints the oval head is the wrong part however good it looks.
The recorded finish is nickel plating over carbon steel. A barrier deposit protects by keeping the steel away from the atmosphere rather than by sacrificing itself, so it holds a bright, even colour across a curved face — which is exactly where a patchy coating shows most.
| Option | How it protects | Effect on dome and cone | Typical use |
|---|---|---|---|
| Nickel plated | Barrier deposit, bright | Thin build; recess re-checked | Visible indoor assemblies |
| Zinc plated | Sacrificial zinc | Thin build; recess re-checked | General indoor work |
| Brass, plain | No coating needed | Dome polishes; cone seats quickly | Decorative and instrument work |
| Stainless, passivated | Passive film, no build | Dome and cone as made | Wet and food service |
| Black zinc plated | Sacrificial zinc, dark | Thin build; wear visible | Dark housings and furniture |
Where the joint is wet, stainless is the specification: the cone is the surface that bears and wears, and a plated cone that loses its coating starts to rust where nobody looks.
Where the part is decorative, brass is the traditional answer and polishes to a warmer tone than nickel. The trade is softness: a brass dome marks more easily, and the recess wears sooner.
Three assemblies where raised countersunk head screws are the fixing:
| Where it sits | The screw seats in a countersink where the edge has to be flush but the head can stay rounded on the face. |
| When it goes wrong | A flat head looks like a cut, or a shallow countersink leaves the oval standing too high. |
| Why it happens | The joint is visible, it is wood or board, and appearance is specified. |
| What we control | Cone angle and dome height checked; first article fitted in the seat. |
| Where it sits | The screw fixes a plate where the head is seen and has to read as a screw rather than as a machined hole. |
| When it goes wrong | The dome is marked or uneven, and the face looks worn. |
| Why it happens | The joint is visible, it is handled, and the finish is part of the product. |
| What we control | Coating and recess checked; first article fitted on the faceplate. |
| Where it sits | The screw seats in a shallow countersink where a flat head would sit on its edge and rock. |
| When it goes wrong | The head stands on the cone edge and the joint does not tighten. |
| Why it happens | The seat is shallow, the panel is thin, and the head has to look right. |
| What we control | Cone angle and seat depth checked; first article assembled. |
Four reasons that matter on a domed head screw, each tied to what the drawing has to prove:
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Dome and cone agreed
Dome height, head diameter and cone angle are agreed together, because on raised countersunk head screws the profile is the specification. Basis: Dome and cone agreed. |
Formed and recessed in one route
The dome and cone are formed in one stroke, the cross recess cut and the thread rolled within one route before plating. Basis: One route from wire to plated screw. |
|
Dome and cone checked
The dome is checked for height and form and the cone for angle, because either being wrong shows on the face. Basis: Dome and cone checked. |
First article seated in the part
The first article is seated in the customer countersink, because how high the dome stands is a property of the pair. Basis: First article seated in the part. |
Shi Shi Tong forms these screws on single-die headers that shape the cone and the dome in one stroke and cut the Phillips recess, then rolls the machine thread and nickel plates the parts. The first part of every run is measured on head diameter, dome height, cone angle, recess depth and thread before the batch continues.
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Forming a cone and a dome in one stroke is where the head is decided. The punch has to leave a clean seat face under the dome and a dome that is even all round; a worn punch leaves a dome that is high on one side, and on a visible head that is the first thing the customer sees.
What decides whether these 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 after plating |
Hardness checked on the wire |
Coating proved by salt spray |
The dome is checked for height and for evenness, the cone for angle and contact, and the recess for size and depth. The thread is gauged after plating, and the coating is checked for colour across the dome.
The first article is seated in the customer countersink and checked for how much of the dome stands above the surface. That is the check that decides acceptance, because the height above the surface is what the design has to allow for.
Every shipment of these screws is traceable to the wire it was made from and to the plating 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 coating. The documents carry the drawing revision and the batch number, so a repeat order keeps the same dome height and cone angle.
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 raised countersunk head screw the first article is seated in the customer seat, because the dome height is a property of the pair. Buyers visit during the process to review samples.
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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 headers 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 cone is the same; the difference is a shallow dome kept above it, so the face is rounded and stands slightly proud.
The dome height, which is quoted on the drawing. A cover that passes over the fixing has to allow for it.
For appearance on furniture and instruments, and for a stronger face than a thin flat head on a hard or shallow seat.
Yes. A head and a countersink of different angles seat on part of the cone, and an oval head then visibly tilts.
It is a barrier coating, so a scratch becomes a rust point; for wet service use stainless.
Head diameter and dome height, cone angle, overall length, recess size and depth, thread and the finish.
How a raised countersunk head screw project runs from drawing to repeat delivery:
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1
Send the drawing and the countersink
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→ |
2
Dome, cone and length agreed
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→ |
3
First article seated in your countersink
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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 dome height, cone angle, overall length, recess size and depth, thread and the finish.
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Head diameter
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Dome height
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Cone angle
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Overall length
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Recess
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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
