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:Stainless pan head machine screw (plain, Phillips)
Materials:Stainless Steel
Surface treatment:Plain, passivated
Head Type:Pan head
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Drive:Phillips cross recess
Thread:Machine thread, right hand
Forming:Cold heading; thread rolled, then passivated
Number:752
We manufacture stainless steel pan head machine screws with a low domed head, a flat bearing face, a Phillips recess and a machine thread, quoted from M1 to M14 in a plain passivated finish. Head diameter, recess depth, thread and grade are taken from your drawing.
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.
A stainless steel pan head machine screw is a machine screw with a low domed head, a flat bearing face and a stainless body. The recorded item on this page is the plain, general-purpose version with a Phillips recess and a machine thread, quoted from M1 to M14 in a passivated finish.
Pan head. A shallow dome on a flat bearing face. The width of that face is what spreads the clamp load on a thin panel, and the low profile keeps the head out of the way of whatever sits above it.
Machine thread. The thread engages a tapped hole, a nut or a threaded insert, so the joint is designed around the mating thread. It can be removed and refitted without damaging the hole, which is why it is used on anything serviced.
Stainless body. The alloy carries the corrosion resistance, so there is no coating to chip at the head edge or to change the thread class, and the part can be supplied plain and passivated.
Phillips recess. A cross recess driven by a standard bit, with the recess depth set against the head height so the bit seats without breaking through into the dome.
Together these decide the joint: the pan head bears and spreads, the machine thread clamps and releases, the cross recess takes the drive, and the stainless body survives the environment. That is why a pan head machine screw in stainless is specified by head diameter, recess, thread and grade together.
The body of this pan head machine screw is stainless wire, with the grade and heat number kept with the batch record. 304 covers indoor and food-side work; 316 is specified where chlorides are present. The grade is on the drawing because it is the only thing that decides how the joint looks after a season of washing.
The pan head is formed in the heading die, dome and bearing face together. The bearing face has to come out flat: it is the surface that transmits the clamp load, and a head that is domed underneath seats on its edge and works loose under vibration.
The Phillips recess is formed in the same operation. Its depth is matched to the head height so that the cross does not break through the thinnest part of the dome — the middle of the head, where the material between recess and bearing face is shortest.
The machine thread is rolled over the full length. Rolling keeps the grain continuous and leaves a smooth flank without the burr a cut thread leaves at the end, and the thread is gauged after passivation so the fit reported is the fit shipped.
The parts are passivated after forming. Passivation removes free iron from the surface and restores the chromium oxide film, and it adds nothing to the head or the thread, so the screw seats and threads as measured.
Pan head machine screws of this type are quoted from M1 to M14; the recorded configuration covers that range in stainless with a plain finish and a Phillips recess. Custom lengths up to 2,000 mm are subject to DFM review after drawing submission, because the head and the thread are set before the tooling is made.
| Item | How it is defined | What we control |
|---|---|---|
| Head diameter | The bearing face that spreads the load | Checked on the projector on the first article |
| Head height | The dome profile and clearance | Measured from the bearing face |
| Recess size and depth | Phillips bit engagement | Checked with the matching bit |
| Thread size and pitch | The fit in the tapped hole | Gauged per batch |
| Length | From under the head to the tip | Datum stated on the drawing; measured on the shop plate |
| Grade | The stainless the part is made from | Confirmed against the material certificate |
Each size is quoted against the panel and the tapped hole it works with. The head diameter, the clearance hole in the panel and the thread engagement are reviewed together, because a pan head that is right for one panel sits proud or pulls through on another.
Length is measured from under the head to the tip. That datum is stated on the drawing because a machine screw that bottoms in a blind tapped hole stops before the head bears, and the whole clamp load is lost without any visible sign.
The bearing face is the working surface of a pan head machine screw. It spreads the clamp load over the head diameter instead of concentrating it at the edge of the hole, and on a thin panel that is the difference between a joint that stays flat and one that dishes around the fastener.
| Parameter | Why it matters on this part | What we control |
|---|---|---|
| Head diameter | Load spread on the panel | Set from the panel on the drawing |
| Bearing face flatness | Seats without rocking | Checked on the first article |
| Recess depth | Drive without breaking through | Checked on the first article |
| Thread class | Fit and re-usability in the tapped hole | Gauged per batch |
| Grade | Corrosion resistance in service | Confirmed on the certificate |
Torque is where stainless changes the rules. Stainless galls when it meets stainless, so a stainless screw driven into a stainless insert can seize before the head seats. The thread fit, the drive speed and — where the drawing calls for it — a lubricant are all part of the specification rather than a workshop preference.
Re-usability is the other half of the argument for a machine thread. On a serviced assembly the screw comes out and goes back several times over the life of the unit; a machine screw with a gauged thread class does that without damaging the hole, while a thread-forming screw in the same panel would not survive the second assembly.
The recess is the part that wears out. A Phillips cross deforms at the corners if it is over-driven, and on a stainless head that deformation is permanent. The first article is driven at the torque the joint needs, with the bit the line uses, rather than checked on a gauge alone.
This pan head machine screw is supplied plain and passivated, with no coating. The passive film is the protection, it reforms after a scratch, and it adds nothing to the head or the recess, so the screw seats and drives as measured.
| Finish | How it protects | Effect on head and recess | Typical use |
|---|---|---|---|
| Plain, passivated stainless | Passive film forms in air | No build-up; head and recess as formed | Food-side, wash-down and indoor joints |
| Electropolished | Surface levelled, chromium enriched | A few microns removed; recess re-checked | Visible stainless panels |
| Bead blasted | Uniform matte surface | No dimensional change | Panels where glare must be removed |
| Black oxide (stainless) | Chemical conversion, thin film | Minimal thickness; recess re-checked | Dark visible panels |
| Zinc plated (steel equivalent) | Sacrificial layer | Build-up on the head; seat re-checked | Steel pan head screws indoors |
Salt-spray exposure is agreed per project and written on the drawing; plain stainless is tested in the condition it ships in. Where the joint is washed with chlorinated chemicals, the grade rather than the finish is what decides the outcome, so the drawing names 316.
Packing protects the domed heads and the recesses. The parts are bagged in counted quantities, labelled with the batch, the material heat and the grade, and packed so the heads cannot rub, because a scuffed stainless head on a visible panel is a rejection.
Three assemblies where a plain pan head and a machine thread are the default:
| Where it sits | The screw closes a cover or a bracket where the head sits on a stainless panel and the joint is washed with chemicals. |
| When it goes wrong | A coated screw loses its finish in the wash and rusts at the head, and a head that dishes the panel traps residue. |
| Why it happens | The equipment is washed on a schedule, the panels are stainless, and the fasteners are inspected. |
| What we control | Grade confirmed on the certificate, the bearing face checked, and the thread gauged per batch. |
| Where it sits | The screw holds a cover, a gland plate or a chassis panel where the thread engages a tapped insert and the joint is serviced. |
| When it goes wrong | A screw that bottoms in the insert leaves the cover loose, and a recess that deforms cannot be re-tightened. |
| Why it happens | The joint is opened for inspection, the panels are thin, and the fasteners are re-used. |
| What we control | Thread class gauged, recess checked with the bit, and the length checked against the insert depth. |
| Where it sits | The screw fixes a bracket, a guard or a cover on a machine where the head clears the moving parts and the joint may be adjusted. |
| When it goes wrong | A head that stands too tall fouls an adjacent part, and a thread that is undersized lets the bracket move. |
| Why it happens | The assembly is adjusted during setup, the parts are metal, and the joint is re-tightened. |
| What we control | Head height checked against the clearance, and the thread gauged so re-torquing does not damage the hole. |
Four reasons that matter on a general-purpose stainless screw, each tied to what the drawing has to prove:
|
Head, thread and grade reviewed together
The head diameter, the thread class and the grade are reviewed before tooling, so a screw that will not seat or will not survive the wash is raised first. Basis: Head, thread and grade reviewed before tooling. |
Headed and rolled in one route
The pan head and the cross recess are formed in the heading die and the machine thread is rolled, so the recess stays centred and the bearing face flat. Basis: One route from wire to finished screw. |
|
Recess and thread checked on the part
The recess is driven with the matching bit and the thread is gauged in its finished condition, on the first article. Basis: First article checked with the bit and the gauges. |
First article to repeat production
The first article fixes the drawing revision, heat number, die set and thread roll; repeat orders are compared against that record. Basis: First article signed off before the batch is released. |
Shi Shi Tong forms these stainless steel pan head machine screws on a heading machine that upsets the pan head and the Phillips recess in one operation, then rolls the machine thread and passivates the parts. The first part of every run is measured on the head, driven with the bit and gauged on the thread, before the batch continues.
|
|
Between runs the insert is changed to the drawing head and recess, and the thread rolls to the size; the first part goes to the projector, to the bit and to the gauges. Stainless work-hardens as it is rolled, so the rolls are set for the grade and the first part is checked before the run continues.
What decides whether a pan head machine screw passes is the head diameter and height, the flatness of the bearing face, the recess depth, the thread class and the grade. The inspection agreement covers those, and the criteria come from the drawing.
Head profile and recess on the projector |
Thread gauged per batch |
Hardness testing where the drawing requires it |
Salt-spray testing of the passivated part |
Each batch is recorded against the drawing revision: head and recess from the first article, the thread gauged per batch, and the grade confirmed on the certificate. If the bit check or the bearing face fails, the parts back to the last good setting are held and re-checked.
An outside report on the material, where the drawing asks for one, is filed with the batch so the paperwork and the parts share one batch number.
Every shipment of stainless steel pan head machine screws is traceable to the wire it was made from. The grade, heat number and standard 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 material. 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 general-purpose part the first article is checked in the joint it was drawn for, so the head diameter and the thread class are signed off together. Buyers visit during the process to review samples and to see how the heads are formed.
|
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 header and the inspection room 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 is a machine screw with a low domed head and a flat bearing face, driven by a cross recess here, with a thread that engages a tapped hole, nut or insert. This one is stainless and quoted from M1 to M14.
Because a pan head bears on a flat face and does not need a countersink. Where the panel is thin and the head may sit proud, it spreads the load over a wider area than a small socket head.
Yes. The thread is a machine thread, so the joint needs a tapped hole, a nut or a threaded insert. A self-tapping screw of the same head shape is a different part.
304 for indoor and food-side work, 316 where chlorides are present. The grade, not the finish, is what decides how the joint looks after a season of washing.
Yes, within the thread class it was supplied to. A machine screw with a gauged class can be removed and refitted several times without damaging the tapped hole, provided it is not over-driven.
Head diameter and height, recess size and depth, thread size and pitch, length and its datum, material and grade, finish, the panel thickness, and the depth of the tapped hole.
How a pan head machine screw project runs from drawing to repeat delivery:
|
1
Send the drawing or sample
|
→ |
2
Head, thread and grade review
|
→ |
3
First article in the joint
|
→ |
4
Batch production and repeat orders
|
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, recess size and depth, thread size and pitch, length and its datum, material and grade, finish, and the panel and tapped hole the screw works with.
|
Head diameter and height
|
Recess size and depth
|
Thread size and pitch
|
|
Length and datum
|
Material and grade
|
Panel and hole depth
|
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
