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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 Hex Head Screw
Materials:stainless steel
Surface treatment:plain
Head Type:hex head
Drive:Phillips + Hex
Thread:Machine Thread
Point:Blunt
Forming:Single Die Heading
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:368
We make phillips hex head screws in passivated stainless with six flats and a cross recess in the same head, so the joint can be driven with a bit and tightened with a spanner. Across flats, recess depth, thread and grade come from your drawing, and the first article is proved with both tools.
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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 hex head screw has two drives in one head: six flats on the outside for a spanner, and a cross recess in the top for a driver. The recorded item is stainless with a plain finish, a hex head with a cross recess and a machine thread, quoted from M1 to M14 with Number 368.
Hex flats. Six flats around a cylindrical head, turned with a spanner or a socket. It is the higher-torque drive of the two, and it works from the side as well as from above.
Cross recess. A Phillips recess in the top face, driven with a standard bit. On a head of this shape it is the drive a power tool uses, and the one that reaches a fixing a spanner cannot get to.
Machine thread. A rolled thread with a blunt chamfered end, made for a tapped hole or a nut. It can be taken out and put back without damaging the thread in the part.
Stainless, plain. Passivated and uncoated, so the alloy is the whole of the protection and both drives are exactly as formed.
A dual drive is not a gimmick; it is a division of labour. The recess is where the screw is driven from, quickly and with a power tool, and it is where the screw tells you it has had enough — a Phillips cams out when the torque reaches what its tapered wings can hold. The hex is where the joint is tightened to its final value, because a spanner can apply far more torque without camming out.
That split is why phillips hex head screws appear in equipment that is assembled on a line and serviced in the field. The line drives with a bit at a set torque; a technician later breaks the joint with a spanner that was already in the toolbag, or with the driver, whichever reaches.
The head has to carry both features at once, and that is the manufacturing constraint. The hex sets the head diameter, the recess has to fit in the top face, and the wall between the recess floor and the bearing face has to stay thick enough to take the spanner load. On a small head those three compete, which is why the recess on a combined head is often a little shallower than on a pan head of the same size.
The other consequence is a pocket. A recess in the top of a hex head holds water and debris, and on a stainless part in an outdoor joint that pocket is exactly the kind of crevice that stops the passive film rebuilding. The head still has six flats to drain past, but the recess itself is a place to keep an eye on.
Plain stainless is passivated after forming. Both drives are read as formed: there is no coating to soften the flats or fill the cross, and the finish that matters is the alloy, which is what makes the part suitable for a service where a plated head would rust at the recess.
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 hex head screws the across-flats dimension, the recess size and the head height are quoted together, because the three share the head.
| Item | How it is defined | What we control |
|---|---|---|
| Head | Hex head with a cross recess | Across flats, height and face flatness |
| Recess | Phillips cross in the top | Depth and width, bit tried on the part |
| Thread | Machine thread | Pitch and length, gauged per batch |
| End | Blunt, chamfered | Chamfer cut, not deburred |
| Finish | Plain stainless, passivated | Surface condition and film |
| Length | From under the head to the end | Measured on the shop plate |
Across flats is the dimension the spanner works with, and it is quoted with the recess because both have to be usable. A head that is a little under size on the flats still looks right and a spanner will round it; a recess that is a little shallow still measures right and a bit will not seat.
Length is measured from under the head, because that face bears on the part. On a hex head the head height adds to the overall length, so a screw quoted into a counterbore has to allow for it or the face will never touch.
Three features define this part: the hex flats, the cross recess and the stainless body. The first two are the reason to buy it; the third is why it can go where a plated screw cannot.
| Feature | What it gives | What it costs |
|---|---|---|
| Hex flats | High torque from the side | Needs spanner clearance around the head |
| Cross recess | Fast driving from above | A pocket that holds water and debris |
| Combined head | Either tool will open the joint | Less head height available for either |
| Plain stainless | No coating to chip at either drive | Galls against stainless; pits in chloride |
| Machine thread | Removable and serviceable | Needs a tapped hole or a nut |
The practical case is access. A fixing beside a wall, inside a cabinet or under a bracket often has room for a driver from above but not for a spanner from the side; the reverse happens on a recessed head where the driver cannot reach. A combined head costs a little head height and removes both dead ends.
The other case is process. A line that already drives Phillips screws can add a hex-head part without a new tool, and a service department that carries spanners can still open it. That is a purchasing argument rather than an engineering one, and it is the reason the head form is so common on equipment that is built in volume and maintained in the field.
The recorded finish is plain, passivated stainless. Nothing is added, so the flats keep their corners, the cross keeps its depth and the pocket in the head is not lined by a coating that could lift at the edges.
| Option | How it protects | Effect on flats and recess | Typical use |
|---|---|---|---|
| Stainless A2, plain | Passive chromium oxide film | None; gauged as formed | Outdoor and general equipment |
| Stainless A4, plain | Passive film with molybdenum | None; gauged as formed | Coastal and washdown |
| Zinc plated steel | Sacrificial zinc | A few microns; both re-checked | Indoor, cost-driven work |
| Black zinc on steel | Sacrificial zinc, dark passivation | A few microns; re-checked | Dark visible equipment |
| Dacromet on steel | Zinc-aluminium flake layer | Film builds; recess re-checked | Outdoor steel assemblies |
Plating a combined head has two places to spoil instead of one. The coating fills the recess, so the bit sits proud and cams out early, and it rounds the corners of the flats, so a spanner that was a close fit becomes a loose one. Both are checked after plating, and the first article is driven and spannered in the plated condition.
Stainless has the same limit as any of its family: the recess is a pocket, and a pocket in a wet joint is where pitting starts. A2 handles inland weather; where chloride is present the grade is the answer rather than a coating over the top of it.
Three assemblies where a phillips hex head screw is the fixing:
| Where it sits | The screw closes a panel or fixes a frame where the line drives with a bit and service breaks the joint with a spanner in a space too tight for a driver. |
| When it goes wrong | A drive that needs one particular tool leaves the panel open until someone finds it, and a rounded hex ends the repair. |
| Why it happens | The fixing is inside a cabinet, the access is awkward, and the joint is serviced. |
| What we control | Across flats and recess checked, first article driven and spannered. |
| Where it sits | The screw holds a guard or a bracket where the joint is tightened to a value a driver cannot reach and opened by whoever is on shift. |
| When it goes wrong | A driver-only head leaves the joint under-tightened, and a spanner-only head is slow to open. |
| Why it happens | The joint has a torque value, the access varies, and the plant runs continuously. |
| What we control | Recess depth and flats checked, thread gauged per batch. |
| Where it sits | The screw fixes a panel or a fitting where the joint sees water, the head is stainless, and service may come with either tool. |
| When it goes wrong | A plated head rusts in the recess, and a stainless one pits there if the grade is wrong for the chloride level. |
| Why it happens | The joint is wet, the head is exposed, and the fixing repeats. |
| What we control | Grade confirmed on the certificate, recess checked, passivation confirmed. |
Four reasons that matter on a combined head, each tied to what the drawing has to prove:
|
Flats and recess reviewed together
The across-flats dimension, the recess depth and the head height are reviewed as one set, so a head with too little wall left or a recess too shallow for the bit is raised before the die is cut. Basis: Flats and recess reviewed as one set. |
Heading, socketting and rolling in one route
The hex head is formed and the cross recess is formed in the same stroke, and the machine thread is rolled in the same route. Basis: Head and recess formed together. |
|
Both drives tried on the part
The first article is driven with the production bit and turned with the spanner size, because a combined head has to work both ways to be worth having. Basis: First article driven and spannered. |
First article fixes the setting
The first article fixes the wire heat, the die set 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 hex head screws from stainless wire on single-die headers that upset the hex head and form the cross recess in the same stroke, rolls the machine thread to a blunt chamfered end and passivates the parts. The first part of every run is measured across the flats, driven with the production bit and turned with a spanner before the batch continues.
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The recess punch works inside a head that the hex has already made small, so the tool has less room than on a pan head. A worn punch leaves a cross that is shallow at the wings, and the same wear lets the punch sit slightly off centre — on a hex head an off-centre recess shows as a cross closer to one pair of flats, and the driver then tips towards that side.
What decides whether phillips hex head screws pass is the flats, the recess, the thread and the alloy. The inspection agreement covers those, and the criteria come from the drawing.
Flats and recess on the projector |
Thread gauged per batch |
Hardness checked on the formed head |
Salt-spray testing of the stainless grade |
The head is checked across flats at both ends and for height, and the recess for depth and width. Both are then proved with tools: the production bit must cam out where the joint wants it to, and the spanner must grip without rounding. A combined head that passes one check and fails the other has lost the reason it was specified.
The thread is gauged per batch, and the alloy is confirmed on the certificate. On a stainless part the recess is also inspected for a rust bloom, which is the sign of free iron left by the punch rather than of a wrong grade.
Every shipment of phillips hex 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 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 combined head the first article is proved with both tools, so the customer confirms the bit and the spanner at the same time. 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
|
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 |
So either tool opens it. The recess drives quickly from above with a power tool, the flats take the final torque from the side where a driver cannot reach.
The flats. A Phillips cams out at its own limit, which is useful as a warning but lower than the joint can take from a spanner.
It removes material from the top face, and on a small hex there is not much to spare. The head height and the recess depth are quoted together for that reason.
It is a pocket. On a stainless part in a wet joint that pocket is a crevice where the passive film struggles to rebuild, so the grade has to suit the service.
Yes. It fills the recess and rounds the flats, so both are checked after plating and the first article is driven and spannered in the plated condition.
Across flats and head height, recess size and depth, thread size and length, length under the head, and the stainless grade.
How a phillips hex head screw project runs from drawing to repeat delivery:
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1
Send the drawing and the tools you use
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→ |
2
Flats, recess and thread review
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→ |
3
First article driven and spannered
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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 across flats and head height, the recess size and depth, the thread size and length, the length under the head, and the stainless grade.
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Across flats
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Head height
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Recess size
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Recess depth
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Thread and 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
