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:Allen Wrench Screws, Button Screw, Socket Screw
Materials:Stainless Steel
Surface treatment:Plain
Head Type:Button Head
Drive:Hexagon socket (Allen)
Thread:Machine thread
Point:Plain, chamfered
Forming:Single Die Heading
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10
Number:862
We make button head screws in plain A2 stainless with a low dome and a hexagon socket, quoting them from M1 to M10. Head height, socket depth, thread and length come from your drawing, and the first article is fitted in your own housing.
Watch the factory video·Email sst@szsst88.com
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.
Button head screws have a low, domed head with a hexagon socket in the top, so the drive sits inside a shape that stays close to the surface. These are plain A2 stainless with a machine thread, quoted from M1 to M10 with Number 862.
Button head. A shallow dome with a smooth rim and a wide bearing face, lower than a cap head and rounder than a pan head.
Hexagon socket. Six flats in the centre of the dome, driven with an Allen key entered from above.
Machine thread. A uniform thread for a tapped hole, a nut or an insert.
Plain stainless. A2 grade, passivated, so the dome and the socket are as formed.
Button head screws are used on covers, panels, housings and equipment that people handle: the low dome does not catch on a cloth or a sleeve, the wide face spreads the clamp, and the internal drive needs no room around the head.
The button head trades head height for appearance and for bearing area. A cap head is a straight cylinder, which gives the socket as much depth as the form allows; a button head is a shallow dome, so the same diameter that holds a deep hexagon in a cap head holds a much shallower one here. That single difference is why button head screws are rated for less torque than cap screws of the same size.
What the dome buys is a head that behaves well on a visible surface. There is no sharp rim to catch, the transition to the panel is gradual, and the bearing face is wide enough that a thin panel is not dimpled at normal torque. On equipment that is wiped, carried or brushed against, that shape is the reason the part exists.
The socket is the drive that makes the button head practical. An internal hexagon needs no side clearance, so the screw can sit in a recess or next to a wall, and the key enters from above. Where a cross recess would climb out of a shallow dome, a hexagon holds its engagement and transmits the torque the thread needs.
The machine thread then sets the joint. With a tapped hole or a nut at the far end, the button head screw can be opened and closed repeatedly and the load is repeatable, which is what a cover or a service panel needs. Where the panel is thin and there is no thread behind it, the same head in a self-tapping version is the right part instead.
Stainless closes the loop. There is no coating to wear at the socket or to mark the dome, and the part can be used where the joint is washed or inspected. The trade is galling: a stainless button head driven dry into an aluminium insert can seize, so a lubricant at assembly is normal practice rather than a fix.
The recorded range is M1 to M10, with lengths made to the drawing. Custom lengths up to 2,000 mm are subject to DFM review after drawing submission. For button head screws the quotation carries head diameter and height, socket size and depth, thread pitch and overall length.
| Item | How it is defined | What we control |
|---|---|---|
| Head | Button, low dome | Diameter, height and rim condition |
| Socket | Hexagon in the dome | Across flats and depth against head height |
| Thread | Machine thread | Pitch, length and start position |
| Length | Overall, head included | Length tolerance and thread start |
| Material | A2 stainless | Grade and heat number on the certificate |
| Finish | Passivated, plain | Surface condition and socket edges |
Socket depth is the number to quote with the head height, because on a button head the two are the same budget. A socket that is a little deeper looks helpful and leaves a wall thin enough to split when a key is loaded.
Head diameter is the dimension that decides how the joint looks and how it behaves on thin sheet. A wider button head spreads the clamp further; a narrower one leaves more room around the fixing but marks a soft panel sooner.
Four features define button head screws, and each one is a trade:
| Feature | What it gives | What it costs |
|---|---|---|
| Low dome | Nothing to catch; close to the surface | Socket is shallower than a cap head |
| Wide bearing face | Clamp spread on panels | Stands above the surface |
| Hexagon socket | No side clearance needed | Socket depth limits torque |
| Machine thread | Repeatable joint | Needs a tapped hole or a nut |
| Plain stainless | Dome and socket as formed | Galls in aluminium; softer than the key |
The value is a head that looks finished and does not interfere. On a housing or a cover, the low dome reads as part of the design rather than as hardware, and there is nothing for a hand, a cable or a cloth to catch on.
The cost is capacity. A button head cannot be tightened as hard as a cap head of the same diameter, and the failure when it is over-tightened is at the socket rather than the thread. Where a high preload is needed, the answer is a cap head and a deeper counterbore.
The recorded finish is passivation on A2 stainless with no coating. On a button head that matters at the socket edges, which are the thinnest features on the part: a coating would round them, and a rounded edge lets the key load the corners at the wrong angle.
| Option | How it protects | Effect on dome and socket | Typical use |
|---|---|---|---|
| A2 stainless, passivated | Passive chromium oxide film | Dome and socket as formed | Covers and housings |
| A4 stainless, passivated | Passive film with molybdenum | Dome and socket as formed | Marine and medical |
| Stainless, electropolished | Thicker passive film, bright | Edges rounded; socket checked | Visible hardware |
| Steel, black oxide | Conversion film, oiled | No measurable build | Dark instrument cases |
| Steel, zinc plated | Sacrificial zinc | Build in socket; re-checked | General indoor panels |
Where the screw is visible, electropolishing brightens the dome and removes the burr at the socket edge that a key would catch. It also rounds the edge slightly, which is why the socket is checked after the process.
Where a coated steel screw is specified, the socket is gauged after plating. A button head already has a shallow hexagon, so a zinc layer is a larger fraction of the usable depth than on a cap head.
Three assemblies where the low dome is the reason:
| Where it sits | The screw closes a cover that is handled and wiped, where the head must sit low and nothing may catch on it. |
| When it goes wrong | The socket rounds on the second service because it is shallow and the key is worn. |
| Why it happens | The head is low, the drive is internal, and the joint is serviced. |
| What we control | Socket proved with the production key; first article fitted and reopened. |
| Where it sits | The screw fixes a panel where the head has to clear the parts inside and stay below the housing line. |
| When it goes wrong | The head fouls an internal component and the board flexes as the screw is tightened. |
| Why it happens | The clearance is small, the joint is inside the case, and the drive is internal. |
| What we control | Head height and socket depth checked; first article fitted in the enclosure. |
| Where it sits | The screw holds a bracket where the head is on a visible face and has to look deliberate. |
| When it goes wrong | A cap head is substituted and the fitting reads as machine hardware. |
| Why it happens | The face is finished, the head is seen, and the joint is assembled on site. |
| What we control | Dome and finish checked; first article fitted to a finished sample. |
Four reasons that matter on a low socket head, each tied to something the drawing has to prove:
|
Socket depth against head height
Socket across flats, depth and head height are agreed as a set, because on a dome the three decide the torque the joint can take. Basis: Socket depth and head height agreed. |
Formed, socketed and passivated in one route
The dome and hexagon are formed in one stroke, the thread rolled and the parts passivated as a batch. Basis: One route from wire to passivated screw. |
|
Socket proved with the key
The socket is proved with the production key at the joint torque, because a shallow hexagon passes measurement and fails a key. Basis: Socket proved with the key. |
First article in the housing
The first article is fitted in the customer housing, because the point of a low dome is clearance only the assembly can prove. Basis: First article fitted in the housing. |
These screws are headed on single-die machines that form the button dome and cut the hexagon socket in one stroke, rolled with the machine thread and passivated as a batch. The first part of every run is measured on head diameter and height, socket depth, thread and length.
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Cutting a hexagon into a dome is harder than cutting it into a cylinder. The dome falls away on every side, so the wall between the socket and the head edge thins as the socket goes deeper, and a socket that is one step too deep leaves a head that measures correctly and splits at the rim under a key.
The rim is the second feature to watch. A button head has a smooth edge by design, and the punch that forms it leaves a radius that shows under the light; a worn punch produces a rim that looks slightly flattened, which on a visible part reads as a defect even when every dimension is inside tolerance.
What decides whether button head screws pass is the dome, the socket, the thread and the grade. The inspection agreement covers those, and the criteria come from the drawing.
Dome and socket on the projector |
Thread and start checked |
Core hardness checked |
Salt-spray testing of the grade |
Head diameter and dome height are measured on a projector, the socket is measured across flats and then proved with the production key at the joint torque, and the thread is gauged after passivation so nothing in finishing has changed the fit.
A sample from every batch is assembled into the customer’s housing and removed. That cycle shows a socket that rounds on removal or a dome that does not clear the housing, and neither appears in a dimensional record.
Every batch is traceable to the wire it was made from and to the passivation batch that finished it. The grade and heat number appear 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 shipment we supply the material certificate, the inspection record for the dimensions on the drawing and, where the grade is listed, the third-party report that covers it. The documents carry the drawing revision and the batch number, so a repeat order keeps the same dome and the same socket.
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 button head screws the first article is fitted in the customer housing, because clearance and socket depth are only proven together. Buyers visit during the process to review samples.
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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 button head is lower and rounder, which suits visible covers. A cap head is taller and takes more torque.
Less than a cap head of the same size, because the socket is shallower in the dome. Set the torque to what the socket takes.
The across-flats size on the drawing, in a length that does not bottom out in a shallow socket.
Less than a small head, because the bearing face is wide. On very thin sheet a washer or a flanged head is still better.
A2 covers rain, A4 covers chlorides. With no coating, the dome and socket stay as formed.
Head diameter and height, socket size and depth, thread pitch and overall length.
How a button head screw project runs from drawing to repeat delivery:
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1
Send the drawing and the housing
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→ |
2
Socket depth and dome agreed
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→ |
3
First article fitted in your housing
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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, socket size and depth, thread pitch and overall length.
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Head size
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Head height
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Socket
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Thread pitch
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Length
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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
