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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 Washer Head Screw
Materials:Steel
Surface treatment:White Zinc Plated
Head Type:Pan Washer Head
Drive:Phillips
Thread:Self Tapping
Point:Gimlet Point
Forming:Single Die Heading
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:868
We make phillips washer head screws in white zinc plated carbon steel with a stepped washer face, a cross recess and a self tapping gimlet point, quoting them from M1 to M14. Face diameter and thickness, thread, point and plating come from your drawing, and the first article is driven into your own panel.
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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 washer head screw is a pan head with a wide washer face formed at its base, driven through a cross recess and, in this form, carrying a self tapping point for soft material. The recorded item is white zinc plated carbon steel with a pan washer head and a gimlet point, quoted from M1 to M14 with Number 868.
Washer head. A pan dome sitting on a wide, flat annular face with a visible step at the outer edge. The face is the bearing area, and because it is formed with the head it cannot be left off on the line.
Cross recess. Four tapered wings around a pointed centre, driven with a standard bit. The bit centres itself and cams out before the head is destroyed.
Gimlet point. A sharp taper with a short threaded lead, made to bite and start its own hole in wood, board and soft polymers.
White zinc. Electroplated zinc with a blue-white passivation, thin enough for a self tapping thread to stay sharp and bright enough for a visible panel.
On phillips washer head screws the case is arithmetic. Contact pressure under a head is the clamp load divided by the bearing area, and area goes with the square of the diameter. Moving from a pan head to a washer head of the same thread roughly doubles the outside diameter, and that is a little over four times the area — which is why a washer head fixes a soft panel that a pan head crushes.
On phillips washer head screws the step at the edge is what makes the face effective. A pan dome curves down into the panel, so only a narrow band near the rim makes contact; the washer face is flat out to a defined diameter, and the transition to the dome is a step rather than a radius. That flat annulus is the whole bearing surface, and if the step is a radius instead, the effective diameter shrinks back to something close to a pan head.
The face also has to be thin enough to follow a slightly uneven surface and thick enough not to dish. On a soft material the head is the weakest element once the bearing area is large: overtighten and the face dishes, contact moves to the outer edge, and the load that was spread becomes a ring.
The self tapping thread and the gimlet point belong to the other side of the joint. The point starts its own hole in soft material and the thread pulls the screw in, so the washer head is carrying a load that arrives from a thread formed in the same soft material — which is exactly the case where bearing area decides whether the joint holds.
White zinc goes on after the thread is rolled. It is a few microns and it follows the thread; on the wide face of a washer head the deposit is also the most visible feature of the part, and an uneven coat shows across the whole annulus.
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 washer head screws the washer face diameter and thickness are quoted with the head height, because together they define the bearing area.
| Item | How it is defined | What we control |
|---|---|---|
| Head | Pan washer head, stepped face | Face diameter, thickness and flatness |
| Recess | Phillips cross | Depth and width, bit tried after plating |
| Thread | Coarse self-tapping, full length | Gauged per batch after plating |
| Point | Gimlet, sharp tip with a threaded lead | Point angle and lead length |
| Plating | White zinc, blue-white passivation | Thickness range and face coverage |
| Length | From under the washer face to the point | Measured on the shop plate |
The face diameter is chosen from the material, not from the thread. In a plastic housing the head has to be wide enough that the clamp load stays below the creep strength of the boss; in soft board it has to reach past the compressed zone. Too small and the panel dimples; too large and the head fouls a rib or the next fixing.
Length is measured from under the washer face, because that is what touches the panel. Measuring from the top of the dome would hide the face thickness inside the thread length, and on a short screw that thickness is a meaningful part of the engagement.
Three features define this part: the stepped washer face, the cross recess and the gimlet point. The first gives bearing area, the second drives it, and the third lets it start in soft material without a pilot.
| Feature | What it gives | What it costs |
|---|---|---|
| Washer face | Four times the bearing area of a pan head | A die feature that cannot be varied later |
| Step at the edge | A full flat annulus in contact | A sharp transition that can be rolled over |
| Cross recess | Standard bit, cams out before damage | Less torque than a socket |
| Gimlet point | Starts its own hole in soft material | Not for sheet without a pilot |
| White zinc | Bright, sacrificial, cheap | Thin; chloride service eats it |
The alternative is a pan head plus a loose washer, and the comparison is a line-versus-design one. A loose washer is a bin, a pick and an occasional omission; a formed washer face is one part that cannot be forgotten. What a loose washer can do and the formed face cannot is move independently, which on an uneven surface helps and on a flat one does not.
The second alternative is a truss head. A truss is wider still and domed rather than stepped, so it covers a larger hole and looks softer; a washer head has a higher step and a flatter face, which suits a countersunk recess where the head may not be very visible and a defined bearing ring is wanted.
The recorded finish is white zinc with a blue-white passivation, applied after the thread is rolled. It is a sacrificial coating: a scratch on the face still has zinc at its edges, and the face is the surface that gets marked, because it is what the panel touches.
| Finish | How it protects | Effect on face and thread | Typical use |
|---|---|---|---|
| White zinc | Sacrificial zinc, blue-white passivation | A few microns; face checked even | General indoor assemblies |
| Black zinc | Zinc with dark passivation | A few microns; re-checked | Dark visible panels |
| Nickel plate | Hard barrier deposit | Thicker; recess re-checked | Bright visible fixings |
| Dacromet | Zinc-aluminium flake layer | Film builds; thread re-checked | Outdoor and wet assemblies |
| Stainless, plain | Passive chromium oxide film | None; gauged as formed | Washed and coastal joints |
On a washer head the finish is judged on a large flat annulus, so an uneven deposit is visible as a patch or a band. Barrel plating leaves contact marks on faces this size, and the sample is approved as a colour sample rather than by measuring thickness alone.
The limit is weather. A thin zinc layer on a self tapping screw is consumed quickly outdoors, and the joint — where the screw has cut its own thread and left bare metal — is where water sits. A flake coating or stainless is the answer for exposed work, not a heavier coat of the same finish.
Three assemblies where a phillips washer head screw is the fixing:
| Where it sits | The screw fixes a component into a moulded boss where the head has to spread the load without cracking the boss wall or dimpling the visible face. |
| When it goes wrong | A pan head either dimples the plastic or stress-cracks the boss, and an over-tightened screw splits the wall. |
| Why it happens | The material is a moulded polymer, the face is visible, and the fixing repeats. |
| What we control | Face diameter and flatness checked, driving torque read in the customer part. |
| Where it sits | The screw fixes a bracket or a fitting into MDF or particleboard where the head has to reach past the compressed surface. |
| When it goes wrong | A narrow head sinks into the board, and a loose washer is dropped on the line and forgotten. |
| Why it happens | The material is soft, the head is seen, and the assembly is made once. |
| What we control | Point and thread tested on a sample board, face flatness checked. |
| Where it sits | The screw holds a panel where a metal skin sits over a soft core or a gasket, and the head has to compress the gasket evenly. |
| When it goes wrong | A pan head compresses the gasket in a narrow ring and leaves the rest of the joint loose. |
| Why it happens | The joint has a soft layer under the head, and the fixing repeats. |
| What we control | Face flatness and diameter checked, recess driven with the production bit. |
Four reasons that matter on a stepped washer head, each tied to what the drawing has to prove:
|
Face and material reviewed together
The face diameter, its thickness and the material under it are reviewed as one set, so a head that would dish or a face that would not reach past the compression zone is raised before the die is cut. Basis: Face and material reviewed as one set. |
Heading, pointing and plating in one route
The pan dome, the stepped face and the cross are formed in one stroke, the thread is rolled and the point is formed in the same route. Basis: One route from wire to plated screw. |
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Face checked flat, thread driven
The face is checked for diameter, thickness and flatness on the first article, and the thread and point are proved in the customer material. Basis: First article driven into the customer material. |
First article fixes the setting
The first article fixes the wire heat, the die set, the point tool and the plating barrel; repeat orders are compared against that record. Basis: First article signed off before the batch is released. |
Shi Shi Tong forms these phillips washer head screws from carbon steel wire on single-die headers that upset the pan dome and the stepped washer face and form the cross in one stroke, rolls the coarse thread and forms the gimlet point so the lead keeps its thread, then white zinc plates the parts. The first part of every run is measured on the face, driven with the production bit and started in a sample of the customer’s material before the batch continues.
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The step between the face and the dome is where the die shows its age. Formed with a sharp edge it gives a crisp bearing ring; formed with a worn die it rounds over, and a rounded step is a radius — which turns the washer head back into a pan head with a wide rim that does not bear. The step is checked on the section of the first article.
What decides whether phillips washer head screws pass is the face, the step, the recess, the thread and the point. The inspection agreement covers those, and the criteria come from the drawing.
Face diameter and step on the projector |
Thread gauged after plating |
Hardness testing against the property class |
Salt-spray testing of the white zinc plate |
The face is checked for outside diameter, thickness and flatness at the rim and at the step. Flatness is the dimension that decides whether the joint closes evenly: a face that is high at the rim touches on a ring and leaves the rest of the annulus doing nothing.
The step is checked on the section of the first article, and the recess is driven with the production bit. On a head this wide the recess sits in the middle of a large face, so a cam-out is very visible — a bright cross on a bright head.
The thread is gauged after plating and the point is checked for angle and for the length of its threaded lead. On a washer head the failure that matters in soft material is the panel compressing around the head while the thread holds, so the driving torque is read in the customer’s material rather than on a plate.
Every shipment of phillips washer 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 washer head the first article is also driven into the customer’s own panel, so the bearing area and the driving torque are proved against the material that matters. 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
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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 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 |
Area goes with the square of the diameter, so roughly doubling the outside diameter gives about four times the area. That is what stops a soft panel dimpling.
It keeps the bearing face flat out to its diameter. If the step is rounded into a radius, the contact shrinks back towards a pan head.
On a line, yes: it cannot be dropped or forgotten. On a very uneven surface a loose washer can move and a formed face cannot.
A gimlet point for wood, board and soft polymers. For sheet metal a flat point and a prepared hole is the right combination.
It can, if it is over-driven. The face is the weakest element once the bearing area is large, and the answer is a torque set from the panel.
Face diameter and thickness, head height, recess size, thread size and point lead, length under the face, and the plating.
How a phillips washer head screw project runs from drawing to repeat delivery:
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1
Send the drawing or the panel sample
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→ |
2
Face, point and thread review
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→ |
3
First article driven into your panel
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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 face diameter and thickness, the head height, the recess size, the thread size and point lead, the length under the face, and the plating.
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Face diameter
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Face thickness
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Recess size
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Thread and point
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Length
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Plating
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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
