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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:Self Tapping Phillips Head Screws
Materials: Steel
Surface treatment:Black Nickel Plated
Head Type:PF. Head
Drive:Phillips cross recess
Thread:Coarse single-lead self-tapping thread, rolled, full to the flange
Point:Sharp tapered point; no drill point
Forming:Single-die heading with flange and recess, thread rolling, black nickel plating, sorting
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:42
We manufacture self tapping phillips head screws with a PF head — a pan dome on an integral flange — a cross recess and a coarse self-tapping thread, in black nickel plated steel. Head and flange, recess, point, thread and length 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.
Self tapping Phillips head screws are screws that form their own mating thread in a prepared hole, driven with a cross bit and finished with an integral flange under the head. The recorded item on this page is steel with a black nickel plate and a PF head, quoted from M1 to M14 with Number 42.
PF head. A pan head with an integral flange at its base: the dome sits on a wide flat washer face. That flange spreads the clamp load on a thin panel, and because it is formed with the head it cannot be left off.
Phillips recess. Four tapered wings and a pointed centre. It centres the bit and cams out before the head is destroyed — a warning rather than a failure, and on a dark head the first sign is a bright cross.
Self-tapping thread. A coarse thread with a sharp crest, rolled over the full length. It forms or cuts its own thread, so the joint needs no nut and no tapped hole.
Black nickel. A dark nickel deposit — harder than zinc and glossier than black oxide. It reads as deliberate dark hardware rather than as a part that has been painted, and it holds up to handling better than either.
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.
The pan dome, the integral flange and the Phillips recess are formed in one heading stroke. That is what keeps the flange flat and the recess concentric: a flange formed separately can shift, and a recess cut after the flange can sit off centre, which on a wide head makes the bit tip the screw as it drives.
The flange is thin and wide. Thin lets it follow the panel and spread the load; wide puts the bearing area out where a thin sheet needs it. The trade is stiffness — a thin flange can dish under heavy torque — so the joint torque is set from the first article rather than from the thread size.
The thread is rolled from under the flange to the point, with a sharp crest, because that crest is what forms the thread in the hole. Rolling work-hardens the steel and gives the crest the hardness it needs to cut without folding over.
The point is formed after rolling, so it has a clean taper. A blunt point skates across a coated panel instead of entering, and the mark it leaves is on the customer’s product rather than on the screw.
Black nickel is applied last, over the head, the recess and the thread. It adds a few microns, so the thread is gauged after plating and the recess is driven with the production bit in the plated condition — the only condition the customer ever sees.
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; self tapping phillips head screws of this form are normally short, because the thread works through a panel rather than through a stack.
| Item | How it is defined | What we control |
|---|---|---|
| Thread | Coarse single-lead self-tapping, full length | Gauged per batch after plating |
| Flange diameter | Wide, integral with the head | Measured on the first article |
| Flange thickness | Thin enough to follow the panel | Checked on the section |
| Recess | Phillips cross | Driven with the production bit |
| Point | Sharp tapered point | Checked on the first article |
| Length | From under the flange to the point | Measured on the shop plate |
Length is measured from under the flange, because that is the face that bears on the panel. That is not the same as measuring from the face of the dome: the flange thickness is the difference, and on a shallow counterbore it decides whether the screw bottoms before the flange seats.
The flange diameter decides both the bearing area and the clearance. A wider flange covers an oversized hole and spreads load further; it also needs room around the head and leaves a wider footprint on a visible face. It is quoted with the head diameter rather than left to the standard.
Three features define this part: the flange spreads load, the cross drives it, and the black nickel decides how it reads. The finish is the one that separates it from the zinc and oxide parts in the same family.
| Feature | What it gives | What it costs |
|---|---|---|
| Integral flange | Bearing area without a loose washer | Cannot be changed after the batch |
| Black nickel | Dark, hard, holds up to handling | A few microns; recess re-checked |
| Phillips recess | Standard bit, cams out before damage | Less torque than a socket of the same size |
| Self-tapping thread | Holds without a nut or tapped hole | Needs the right pilot hole |
| Sharp point | Clean start in wood, board and plastics | Not for sheet without a drilled hole |
The finish comparison is the one worth making. Black oxide is a conversion film on the steel, so a scratch exposes bare steel; black zinc is a sacrificial layer, so a scratch exposes zinc and the steel is still covered; black nickel is a hard deposit that resists handling best of the three but protects least if it is scratched through. For a visible fixing that is handled, the first two matter less than how it wears — and nickel wears slowest.
The flange and the finish work together on a visible panel. A flange that is dished shows as a rocked head under a light, and a finish that marks easily shows every touch. On a dark assembly the pair of them is what decides whether a row of fixings looks consistent after a season of use.
The recorded finish is black nickel plating, applied after the thread is rolled. It is a hard dark deposit that takes handling without showing every mark, which is what a visible flange head needs.
| Finish | How it protects | Effect on flange and recess | Typical use |
|---|---|---|---|
| Black nickel | Hard dark deposit | A few microns; recess re-checked | Visible dark equipment |
| Black oxide | Thin conversion film, oiled | Almost no change | Dry indoor assemblies |
| Black zinc | Zinc with black passivation | A few microns; gauged after | Dark panels, damp service |
| White zinc | Sacrificial zinc, blue-white passivation | Thin; gauged after | General indoor work |
| Dacromet | Zinc-aluminium flake layer, cured | Thin film; flange re-checked | Outdoor and wet assemblies |
The recess is where plating causes a functional problem. Every micron narrows the cross, and on a small flange head a few microns is enough to make the bit tight. That is why the first article is driven with the production bit after plating and why the plating range is quoted on the drawing rather than left to the line.
Where the joint is outdoors, black nickel is the wrong answer even though it looks right. It is a decorative deposit on steel, and a wet joint rusts from inside the recess. A Dacromet or stainless version of the same head is what that service needs.
Three assemblies where a dark flange head fixing into a thin panel is the right choice:
| Where it sits | The screw closes a housing or fixes a module where the head sits on a dark face and the flange spreads load on a thin wall. |
| When it goes wrong | A small head marks the panel, and a bright head shows through a vent or a gap. |
| Why it happens | The housing is dark, the wall is thin, and the fixing repeats. |
| What we control | Flange diameter and flatness checked, recess driven with the production bit. |
| Where it sits | The screw closes a cover or fixes a terminal plate where the joint is opened for service and the flange protects a coated face. |
| When it goes wrong | A head without a flange dishes the sheet and cracks the coating around the hole. |
| Why it happens | The enclosure is coated and thin, the fixing is seen, and the joint is serviced. |
| What we control | Recess and flange checked, thread gauged after plating. |
| Where it sits | The screw fixes a bracket or a trim where the fixing is visible on a dark finish and the panel behind it is thin. |
| When it goes wrong | A bright screw reads as a repair on a dark product, and a narrow head pulls into a soft board. |
| Why it happens | The face is visible, the material is thin or soft, and the assembly is made on a line. |
| What we control | Flange diameter matched to the spacing, tone matched to the sample. |
Four reasons that matter on a plated flange head, each tied to what the drawing has to prove:
|
Flange and finish reviewed together
The flange diameter and thickness, the recess size and the plating thickness are reviewed as one set, so a flange that would dish or a recess that would tighten is raised first. Basis: Flange and finish reviewed as one set. |
Head, flange and thread in one route
The pan dome, the integral flange and the recess are formed in one stroke, and the thread is rolled to a sharp point. Basis: One route from wire to plated screw. |
|
Recess and flange checked on the part
The recess is driven with the production bit after plating, and the flange is checked for flatness on the first article. Basis: First article checked after plating. |
First article to repeat production
The first article fixes the drawing revision, wire heat, die set, thread roll and plating, and repeat orders are compared with that record. Basis: First article signed off before the batch is released. |
Shi Shi Tong forms these self tapping phillips head screws on a single-die header that upsets the pan head and the integral flange, and forms the cross recess in the same stroke. The coarse thread is rolled over the full length to a sharp point, and the parts are black nickel plated. The first part of every run is measured on the flange, driven with the production bit and driven into a sample of the material, before the batch continues.
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The flange is where the die shows its age. A worn die leaves a flange that is slightly thicker at one side, and a flange that is not uniform will dish unevenly when driven — the head then leans and the joint reads as loose without any visible cause. The flange is checked on the section of the first article and sampled through the run.
What decides whether self tapping phillips head screws pass is the flange, the recess, the thread, the point and the plating. The inspection agreement covers those, and the criteria come from the drawing.
Flange and head on the projector |
Thread gauged after plating |
Hardness testing against the property class |
Salt-spray testing of the black nickel plate |
The flange is checked by driving the first article into a sample panel and reading the contact ring and the flatness afterwards. A flange that is flat on the bench and dished after driving has told you the joint torque is above what that flange thickness will take.
The recess is checked after plating with the production bit. On a black head the damage shows as a bright cross on the dome, and the first article is inspected for that before the batch is released.
Every shipment of self tapping phillips head screws is traceable to the wire it was made from and to the plating 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 material or the plating. 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 dark plated head the first article is approved as a colour sample as well as a part, and every batch is compared with it. Buyers visit during the process to review samples and to see how the heads are formed.
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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 header and the plating 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 pan head with an integral flange at its base — a domed head on a wide flat washer face. The flange spreads load without a separate washer.
It is a hard dark deposit, glossier than black oxide and harder than black zinc, used where the fixing is visible on a dark assembly and handled.
A sharp tapered point for timber, board and plastics. For sheet metal the hole is drilled or punched first.
From under the flange to the point. The flange adds thickness, so a counterbore has to allow for it.
The deposit wears at the edges and in the recess before anywhere else, showing brighter nickel underneath. The protection remains; the tone changes.
Thread size and pitch, head and flange diameter, flange thickness, recess size, point form, length and datum, and the finish.
How a self tapping phillips head screw project runs from drawing to repeat delivery:
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1
Send the drawing or sample
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→ |
2
Flange and finish review
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→ |
3
First article driven and matched
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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 and flange diameter, flange thickness, recess size, point form, length and datum, material and finish.
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Thread and pitch
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Head and flange
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Flange thickness
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Recess size
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Point form
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Length and finish
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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
