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:Furniture Screw Manufacturer, Deck Screw Manufacturers
Materials:Carbon Steel
Surface treatment:Plain
Head Type:PF Low Profile 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:11
We make furniture screws in carbon steel with a PF low head and a hexagon socket, quoting them from M1 to M10. Head height, socket depth, thread and length under the head come from your drawing, and the first article is fitted into your own fitting.
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.
These furniture screws are carbon steel machine screws with a low, flat (PF) head, a hexagon socket and a plain uncoated finish, quoted from M1 to M10 with Number 11. The low head is what makes them useful in furniture: it sits inside a shallow machined recess in a connector or a bracket, so the joint closes flat instead of standing on a screw head.
PF low head. A short cylindrical head with a flat top, much lower than a standard cap head and wider than a socket set screw.
Hexagon socket. A recess in the head driven with an Allen key, so nothing needs to reach the sides of the head.
Machine thread. A uniform thread for a tapped insert, a nut or a threaded plate inside a joint.
Plain carbon steel. No plating and no coating, which means the part is for dry internal joints or for assemblies that are painted or covered afterwards.
Furniture screws of this type are used with knock-down fittings and cam systems, cam-and-bolt systems, shelf supports and bracket plates, and in shopfitting where a fixing has to disappear into a routed channel and the head must not stand above the surface line.
A furniture joint is usually designed around a fitting, not around a screw, and that is true of every furniture screw worth specifying. The fitting is a metal plate, a cam or a bracket that has been milled with a recess the width of a screw head and a few millimetres deep, and the screw has to sit inside that recess without standing above it. That is what the PF head is for: it is low enough to clear the fitting face and wide enough to carry the clamp.
On furniture screws the socket drive is part of the same idea. In a recess there is no room to swing a driver at an angle; a key comes in straight from above and takes the screw with it. It also means the head needs no external flats, so the recess can be a simple routed slot rather than a machined hexagon.
What the low head on furniture screws costs is torque. A short head leaves a shallow socket, and a shallow socket limits how hard the screw can be driven before the hexagon loads at its corners. Furniture joints are usually closed by feel, with a key that is small enough to fit the recess, so the limit is rarely reached; it is reached when someone uses a long key and drives until it stops.
The plain finish on furniture screws then decides where they can be used. Carbon steel with no coating will rust in a damp room, so these screws belong inside a joint that is dry and closed, or in an assembly that is painted, laminated or covered after fixing. Put them in a deck or an outdoor frame with nothing over them and they will show rust at the head within a season.
That is an important distinction when the same page also serves deck work. Deck screws are a different family: usually a countersunk or washer head, coated, and self-tapping into timber. The part recorded here is the furniture-side fastener, and mixing the two is how a joint that should last ends up with the wrong screw in it.
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 furniture screws the quotation carries head diameter and height, socket size and depth, thread pitch and the length under the head.
| Item | How it is defined | What we control |
|---|---|---|
| Head | PF, low flat top | Diameter, height and underside flatness |
| Socket | Hexagon in a low head | Across flats, depth and corner condition |
| Thread | Machine thread | Pitch, length and start position |
| Length | Under the head | Length tolerance and thread start |
| Material | Carbon steel | Grade and heat number on the certificate |
| Finish | Plain, uncoated | Surface condition and freedom from oil |
On furniture screws the head height is the number that decides whether the fitting closes. It is quoted with the depth of the recess in the fitting, and a screw that is a few tenths too tall leaves the plate standing proud, which on a laminated panel reads as a defect in the furniture rather than in the fastener.
On furniture screws the socket depth belongs on the same line as head height. On a PF head there is very little material between the socket floor and the bearing face, and a socket cut to suit a longer key leaves a head that deforms under load.
Four features define this family, and each one has a consequence for a furniture joint:
| Feature | What it gives | What it costs |
|---|---|---|
| PF low head | Sits inside a fitting recess | Little room for a deep socket |
| Hexagon socket | Key enters straight from above | Shallow socket limits torque |
| Machine thread | Repeatable joint in an insert | Needs a threaded part in the joint |
| Plain carbon steel | Marking-free for painting or covering | Rusts if left exposed |
| Length under head | Matches the fitting height | Datums must be stated on the drawing |
The value of furniture screws is that the screw becomes invisible. In knock-down furniture the visible face is laminate or veneer, and a screw head standing above the fitting is the first thing a customer notices. A PF head that sits inside the recess lets the joint read as a solid piece.
The cost is durability without a finish. Furniture screws are meant to be closed inside a joint; where the assembly is exposed, a plated or stainless version of the same head is the right part, and the difference in price is much smaller than the cost of a rust stain on a panel.
The recorded finish is plain carbon steel, uncoated. In a furniture screw that is a deliberate choice: the screw is inside the fitting, it is never seen, and it may be painted over or covered by the panel, so a coating would only add build in a socket that has no room for it.
| Option | How it protects | Effect on socket and head | Typical use |
|---|---|---|---|
| Plain carbon steel | None | Socket as formed; oil free | Closed furniture joints |
| Zinc plated | Sacrificial zinc | Build in socket; re-checked | Indoor joints, visible |
| Black oxide | Conversion film, oiled | No measurable build | Dark fittings |
| Zinc nickel | Alloy coating, stronger | Build noticeable; socket re-checked | Damp and outdoor |
| Stainless, passivated | Passive film | Socket as formed | Exposed furniture |
Where the joint is an outdoor deck or a damp environment, the answer is not plain furniture screws with paint on them: it is a coated or stainless part with a head form suited to timber, and a thread that forms in wood. Those are different parts from the one recorded here, and the page is explicit about it.
Where the joint is indoor but the screw is visible, zinc plating gives a bright finish and enough protection. The socket is re-checked after plating, because a low head has little room for build.
Three assemblies where a low head inside a fitting is the point:
| Where it sits | The screw closes a cam-and-bolt or bracket joint where the head sits inside a milled recess and the panel face must stay flat. |
| When it goes wrong | The head is a little tall and the fitting stands proud on a laminated face. |
| Why it happens | The fitting is machined, the visible face is laminate, and the joint is closed on site. |
| What we control | Head height and socket depth checked; first article fitted in the fitting. |
| Where it sits | The screw fixes a shelf support or a partition bracket where the fixing is hidden behind the panel. |
| When it goes wrong | The socket is shallow and the key rounds it during site assembly. |
| Why it happens | The joint is hidden, the access is tight, and the drive is a key. |
| What we control | Socket proved with the production key; first article assembled and reopened. |
| Where it sits | The screw is fitted at the factory into a threaded plate, and the assembly is painted or laminated afterwards. |
| When it goes wrong | Oil from the screw bleeds through the finish or the plain steel rusts before painting. |
| Why it happens | The joint is pre-assembled, covered afterwards, and the screw is never seen. |
| What we control | Surface condition and freedom from oil checked; first article painted as the customer’s process requires. |
Four reasons that matter on a low head that has to hide inside a fitting, each tied to something the drawing has to prove:
|
Head height against the recess
Head height, socket depth and the recess in the fitting are agreed as a set, because the joint closes on those three numbers. Basis: Head height and recess agreed. |
Headed, socketed and finished in one route
The low head and socket are formed in one stroke, the thread rolled, and the parts left uncoated and oil free. Basis: One route from wire to plain screw. |
|
Socket proved with the key
The socket is gauged and then proved with the key the assembly uses, because a shallow hexagon passes measurement and fails a key. Basis: Socket proved with the key. |
First article fitted in the joint
The first article is fitted into the customer fitting, because the point of the low head is clearance that only the fitting can prove. Basis: First article fitted in the fitting. |
Furniture screws are headed on single-die machines that form the low head and cut the hexagon socket in one stroke, then rolled with the machine thread. No coating is applied, so the parts are degreased and packed dry, and the first part of every run is measured on head diameter and height, socket depth, thread and length under the head.
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Cutting a socket into a head as low as this is the constraint that shapes every furniture screw of the type. The punch has to reach the depth the key needs while leaving a floor that is thick enough to resist the drive, and on a PF head the two limits are close. A punch that is slightly deep gives a screw that measures correctly and splits at the corners the first time a long key is used.
Leaving the parts uncoated is a process decision rather than a saving. The parts are washed and dried, and they are packed so they do not pick up moisture; a plain screw that arrives oily will bleed into a paint finish, and one that arrives damp will show rust spots before it is ever fitted.
What decides whether these screws pass is the head height, the socket, the thread and the surface condition. The inspection agreement covers those, and the criteria come from the drawing.
Head height and socket |
Thread and start checked |
Core hardness checked |
Salt-spray testing when a coating is added |
On furniture screws head height and diameter are measured on a projector, and the socket is proved with the key used on the line. Because the head is low, the socket check is done on the finished part, and a sample of each batch is driven into the customer fitting rather than into a gauge.
On furniture screws surface condition is checked for oil and for rust spots, because on an uncoated part those are the two failures that reach the customer. A batch that is dimensionally perfect and packed damp will come back as a complaint about staining rather than about size.
Every batch is traceable to the wire it was made from. 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 and the inspection record for the dimensions on the drawing. The documents carry the drawing revision and the batch number, so a repeat order keeps the same head height and the same socket.
The certificate pack travels with the shipment, and a copy is kept against the batch number for repeat orders.
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 furniture screws the first article is fitted into the customer fitting, because the low head exists to clear a recess that only the fitting can prove. 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 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 has to sit inside a shallow recess in a fitting, so the panel face closes flat over it.
No. With no coating the part rusts in damp conditions. Use a coated or stainless screw for exposed joints.
Less than a standard cap head, because the head is short and the socket is shallow. Close the joint with the key that fits the recess.
For timber decks, yes: a deck screw is a different family with a coating and a wood thread. These are for closed furniture joints.
Under the head on this part. State the datum, because the fitting height is what the length has to match.
Head diameter and height, socket size and depth, thread pitch and length under the head.
How a furniture screw project runs from drawing to repeat delivery:
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1
Send the drawing and the fitting
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→ |
2
Head height and socket agreed
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→ |
3
First article fitted in the joint
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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, length under the head and the fitting recess.
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Head diameter
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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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Fitting recess
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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
