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+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 Steel Self Tapping Screws Pan Head
Materials:Stainless Steel
Surface treatment:Plain
Head Type:Pan Head
Drive:Phillips cross recess, four tapered wings with a pointed centre
Thread:Coarse single-lead self-tapping thread, rolled, full to the head bearing face
Point:Sharp tapered point; no drill point, no cutting slot
Forming:Single-die heading, thread rolling, point forming, cleaning and passivation, sorting
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:696
We manufacture stainless steel self tapping screws with a pan head, a Phillips cross recess, a coarse thread over the full length and a sharp point, in plain passivated stainless steel. Head, recess, point, thread and length are taken from your drawing.
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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.
Stainless steel self tapping screws with a pan head are screws whose coarse thread forms its own mating thread in a prepared hole, in a stainless alloy so the fixing survives weather and wash-down. The recorded item on this page is a pan head Phillips screw, plain and passivated, with a sharp point, quoted from M1 to M14 with Number 696.
Pan head. A low dome over a flat annular bearing face. It is the default head for a small self-tapping screw: enough bearing area for thin sheet, low enough to pass under a cover, and no flange to take up space on a crowded panel.
Phillips recess. Four tapered wings and a pointed centre, sized for the standard cross bit. On a small stainless screw the recess is the part that fails first if the bit is worn, so the bit has to fit.
Self-tapping thread. A coarse single-lead thread rolled from under the head to the point. It cuts or forms its own thread in the hole, so the joint needs no nut and no tapped hole.
Sharp point. A tapered point that starts in the hole and leads the thread in. In timber, board and plastics it makes its own start; in sheet metal the hole is drilled or punched first.
Stainless, plain. The alloy provides the protection, so there is no coating to chip at the driving edges and no film filling the recess. On a small screw that matters: a plated layer is a meaningful fraction of a 1.6 mm head.
The pan head and the Phillips recess are formed in one heading stroke, so the recess stays concentric with the shank. At the small sizes the wall between the recess and the outside of the head is a few tenths of a millimetre, which is why the recess is formed rather than machined.
The thread is rolled from under the head to the point, with no plain shank. Rolling work-hardens the stainless flank, and that work-hardening is what lets a stainless screw cut into a stainless sheet without the thread folding over on the first turn.
The point is formed after rolling, which gives it a clean taper. A point that is blunt skates across a coated panel instead of entering, and the mark it leaves is on the customer’s product rather than on the screw.
The parts are cleaned and passivated. Passivation removes the embedded iron left by heading and rolling, and on stainless steel self tapping screws that is what stops the thread roots from rusting in a pattern that looks like a material fault.
The recorded finish is plain, which leaves the recess and the thread at their formed dimensions — the two features the drive and the grip both depend on. On stainless steel self tapping screws pan head the recess is therefore exactly as formed.
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; stainless steel self tapping screws pan head are mostly used at the small end, where the head is a couple of millimetres across and the panel is thin.
| Item | How it is defined | What we control |
|---|---|---|
| Thread | Coarse single-lead self-tapping, full length | Gauged per batch |
| Head diameter | About twice the thread diameter | Checked on the projector |
| Head height | Low dome over a flat bearing ring | Measured from the bearing face |
| Recess | Phillips cross | Driven with the production bit |
| Point | Sharp tapered point | Checked on the first article |
| Length | From under the head to the point | Measured on the shop plate |
The head diameter decides how much load the panel sees. At about twice the thread, a stainless pan head covers a normal clearance hole with margin; where the sheet is thinner than intended, a washer head of the same thread spreads the load further, and that is a different part rather than a variation. Stainless steel self tapping screws pan head are quoted with the head diameter against the sheet, not against the thread alone.
Length is measured from under the head, and with a full thread the usable length is the whole shank. In a blind hole the thread depth has to be at least the length minus the panel thickness; on a stainless screw, too long a length breaks out of a visible face and leaves a torn hole that cannot be dressed.
A stainless self-tapping screw is not simply a steel one in a better alloy. Three of its behaviours are different, and each of them changes how the joint is specified.
| Behaviour | What it means in the joint | What to do about it |
|---|---|---|
| Work hardening | The cut hardens the sheet around the hole | Right pilot size; do not ream or re-drive |
| Galling | Stainless on stainless can seize during driving | Dry film or a different alloy pairing |
| Less forgiving hole | A hole that is a size off strips or splits | Hole size on the drawing, tested in the sheet |
| No coating to chip | Recess and thread stay as formed | Drive with a bit that fits |
| Corrosion resistance | Suitable for wash-down and weather | Grade per environment: 304 or 316 |
Work hardening is the one that catches people out. The first turn of a stainless screw cuts cleanly, but if it binds and is worked back and forth the sheet gets harder and the next attempt is worse. That is why the pilot hole and the driving torque matter more here than on a plated steel screw, and why the first article is driven once at the specified torque rather than tested repeatedly.
Galling is the second. A stainless screw driven into stainless sheet can seize at the thread, and the joint then comes apart as a damaged hole and a torn thread. Where the joint is stainless to stainless, the drawing should say so, and a dry film or a different alloy pairing is chosen rather than left to assembly. That is the one line on a stainless steel self tapping screws pan head drawing that assemblers cannot add later.
The third is simply tolerance: a stainless self-tapping screw has less room for a wrong hole than a plated steel one, because the consequences are harder to correct. That is a good thing on a production line — it forces the hole size to be specified — and a nuisance in a repair shop where the hole is drilled by eye.
The recorded finish is plain stainless, cleaned and passivated. There is no coating to fill the recess or blunt the thread crests, which is exactly what a small self-tapping screw needs: the crest is the cutting edge.
| Option | What it does | Effect on recess and thread | Typical use |
|---|---|---|---|
| Cleaned and passivated | Removes free iron after forming | No dimensional change | General and wet service |
| Satin bead blast | Even matte face | Edges softened slightly | Visible panels |
| Bright passivated | Cleaner, brighter surface | No dimensional change | Instruments and appliances |
| Electropolished | Levels micro peaks | Crests rounded a little; bite checked | Hygienic and chemical service |
| Dry film | Reduces galling in stainless joints | Film checked in the recess | Joints opened occasionally |
Passivation is the treatment that can be added without changing the bite. It removes the embedded iron from the thread roots and leaves the geometry alone, so the first article does not have to be re-driven — which matters on a screw whose whole function is to cut. On stainless steel self tapping screws pan head passivation is the only finish that leaves the bite alone.
A dry film is the exception, and it is the one finish choice that changes the joint rather than the appearance. It reduces galling between stainless parts, but a little of it reaches the recess, so where it is specified the recess is checked with the bit afterwards.
Three assemblies where a small stainless tapping screw is the right fixing:
| Where it sits | The screw fixes a panel, a guard or a fitting on stainless equipment where the joint is washed down between runs and no nut is available behind. |
| When it goes wrong | A plated screw rusts at the recess in a wash area, and a screw that binds work-hardens the sheet around the hole. |
| Why it happens | The equipment is stainless, it is cleaned daily, and the fixing is visible. |
| What we control | Grade and passivation recorded, point and thread driven into a sample of the sheet. |
| Where it sits | The screw closes a cover or fixes a bracket where rain or salt air reaches the joint and the fixing has to stay serviceable. |
| When it goes wrong | A zinc plated screw rusts from the first scratch, and a hole that is a size off strips in the salt air. |
| Why it happens | The enclosure is exposed, it is serviced, and the face is seen. |
| What we control | Grade 304 or 316 agreed, thread gauged, first article driven in the sheet. |
| Where it sits | The screw fixes an internal bracket or a cover at sizes down to M2, where the panel is thin and the fixing is small. |
| When it goes wrong | A cross recess in a small stainless head rounds before the joint is tight, and a hole that is too large strips on the first turn. |
| Why it happens | The assembly is small, the panel is thin, and the fixing is repeated. |
| What we control | Recess driven with the production bit, head and point checked on the magnified first article. |
Four reasons that matter on a stainless tapping screw, each tied to what the drawing has to prove:
|
Material and hole reviewed together
The grade, the point form and the pilot hole are reviewed as one set against the sheet, so a screw that would strip or gall is raised before tooling. Basis: Grade, point and hole reviewed as one set. |
Head, thread and point in one route
The pan head and the recess are formed in one stroke, and the coarse thread is rolled to a sharp point on the same route. Basis: One route from wire to passivated screw. |
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Recess and thread checked on the part
The recess is driven with the production bit and the thread is gauged per batch, and the first article is driven into a sample of the sheet. Basis: First article driven in the sheet sample. |
First article to repeat production
Everything that decides the batch – drawing revision, wire heat, die set, thread roll – is fixed at the first article and reused for repeats. Basis: First article signed off before the batch is released. |
Shi Shi Tong forms these stainless steel self tapping screws on a single-die header that upsets the pan head and the Phillips recess in one stroke, then rolls the coarse thread over the full length and forms the point. The parts are cleaned and passivated. The first part of every run is measured on the head, driven with the production bit and driven into a sample of the customer’s sheet, before the batch continues.
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Stainless sets the pace of the route. It work-hardens in heading and again in rolling, so the die and the rolls are cut for the grade rather than for a generic steel, and the point is formed in a separate step so it stays sharp. A point that has been blunted by the roll will skate, and on stainless it takes a piece of the coating or the passivation with it. Every batch of stainless steel self tapping screws pan head is checked on the point for that reason.
What decides whether stainless steel self tapping screws pan head pass is the head, the recess, the thread, the point and the surface. The inspection agreement covers those, and the criteria come from the drawing.
Head and point on the projector |
Thread gauged per batch |
Hardness testing of the wire |
Salt-spray testing where the service requires it |
The point is checked on a sample of the actual material. A point that suits board will skate on thin sheet, and the test that settles which part has been made is the one that drives it into the customer’s sheet rather than into a test plate.
The recess is checked by driving and inspecting the wings. On a small stainless head the damage starts as a polish mark on the wing edges before the head strips, and that mark is what the inspection looks for on the first article.
Every shipment of stainless steel self tapping screws pan head is traceable to the wire it was made from. 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 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 stainless tapping screw the first article is driven once into the customer’s sheet and the result recorded with the hole size, because the same hole cannot be driven twice. Buyers visit during the process to review samples and to see how the points 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 header 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 |
Fixing into sheet, board and plastics where the joint is washed or outdoors and no nut is available on the far side.
It work-hardens at the cut. The first turn cuts cleanly, but a screw that binds and is worked back and forth makes the hole harder and the next attempt worse.
They can, especially stainless into stainless sheet. A dry film on the thread or a different alloy pairing is the usual answer.
A sharp tapered point for timber, board and plastics. For sheet metal the hole is drilled or punched first.
304 covers general indoor and outdoor work; 316 is used where chlorides are present, such as coastal sites or wash-down equipment.
Thread size and pitch, head diameter and height, recess, point form, length and datum, grade, and the pilot hole.
How a stainless steel self tapping screw project runs from drawing to repeat delivery:
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1
Send the drawing and a sheet sample
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→ |
2
Grade and point review
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→ |
3
First article driven in the sheet
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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 thread size and pitch, head diameter and height, recess, point form, length and datum, stainless grade and the pilot hole.
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Thread and pitch
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Head diameter and height
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Point form
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Length and datum
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Grade
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Pilot hole
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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
