Screws
Phillips Pan Combi Screw with Washer
The Phillips Pan Combi Screw with Washer is a cold forged stainless steel fastener combining a pan head, integrated washer, and Phillips cross-recess drive into a single component. Accurate Fastners manufactures this screw in SS 202, SS 304, and SS 316 across the M4 to M6 diameter range.
- Standard
- —
- Grades
- 304 / 316 / 202
- Size
- M4 – M6
- Length
- On enquiry
Overview
What is the Phillips Pan Combi Screw with Washer?
A combi screw is a fastener in which a washer is pre-assembled onto the screw shank and retained beneath the head, eliminating the need to handle the washer as a separate loose part during assembly. The Phillips Pan Combi Screw with Washer produced by Accurate Fastners follows this design, pairing it with a low-profile pan head and a Phillips cross-recess drive. It is available in stainless steel grades SS 202, SS 304, and SS 316 and is cold forged to metric thread dimensions from M4 to M6.
The pan head geometry distributes the clamping load over a wider contact area than a countersunk or raised-head profile, making it suited to applications where the fastener bears against relatively thin or soft substrates. The pre-assembled washer extends this bearing surface further, spreading the load and helping to protect the surface finish of the mated component. The Phillips drive is a widely recognised cross-recess form that is compatible with standard powered screwdrivers and manual Phillips bits, supporting straightforward installation in production or field environments.
Cold forging is the manufacturing process used for this screw. In cold forging, the fastener is formed at or near room temperature by pressing metal into dies under high pressure, which refines the grain structure of the material and typically yields a component with good surface integrity and dimensional consistency. This process is commonly used for smaller-diameter metric fasteners. The finished screws are subject to quality checks by Accurate Fastners' quality control team at both the procurement and delivery stages, in line with the company's stated quality practices.
In Depth
Product description
Construction & Geometry
The screw body carries a metric thread and is headed with a pan profile — a low, rounded head with a flat underside that seats flush against the washer. The pre-assembled washer sits captured on the shank directly beneath the head and rotates freely until the fastener is driven, at which point it bears against the substrate surface. The Phillips cross-recess is machined or formed into the top face of the pan head.
Cold forging shapes the shank and head from stainless steel bar stock, producing a fastener with a work-hardened surface layer and a continuous, uninterrupted grain flow through the head-to-shank transition. The metric thread form conforms to standard metric pitch geometry, allowing engagement with any compatible metric nut, threaded insert, or tapped hole in the M4 to M6 range. Thread length and overall screw length must be confirmed at the time of enquiry.
Functional Behaviour in an Assembly
During installation, the pre-assembled washer serves two simultaneous functions: it increases the bearing area under the head, thereby reducing contact stress on the joined material, and it provides a degree of surface protection by acting as an intermediate layer between the rotating head and the substrate. This may be particularly relevant when fastening into materials that are prone to marking or where the joint surface requires some degree of sealing at the fastener location.
Because the washer is captured and cannot be misplaced, the assembly process is simplified compared to using a separate screw and washer. Fewer loose components per joint reduces the risk of omitted washers during high-volume production runs. The Phillips drive transmits torque via the four recess flanks of the cross pattern; correct bit sizing and alignment are recommended to minimise cam-out, which is a characteristic of the Phillips recess form under high torque.
How It Differs from Similar Fasteners
A standard Phillips pan head screw without an integrated washer relies on the head underside alone to bear against the joint surface. By incorporating a pre-assembled washer, the combi variant increases load distribution without requiring a separate washer component in the assembly process. This distinguishes it from both plain pan head screws and pan head screws supplied with loose washers, where the washer must be threaded onto the shank manually before or after insertion.
Compared to a Pozidriv pan combi screw — which uses a superficially similar cross recess — the Phillips recess has a different flank angle and does not feature the secondary tick marks of the Pozidriv pattern. The two drives are not fully interchangeable, and using a Pozidriv bit on a Phillips recess or vice versa may increase the risk of drive damage. Accurate Fastners' range uses a Phillips cross recess specifically, which should be confirmed when specifying tooling.
Material & Grade
Material and grade information
- SS 304
- SS 316
- SS 202
This screw is available in three austenitic stainless steel grades: SS 202, SS 304, and SS 316. SS 304 is a widely used austenitic grade that generally offers good corrosion resistance in indoor and mildly exposed environments and is commonly specified across the food processing, pharmaceutical machinery, and general engineering sectors. SS 316 contains molybdenum, which is understood to improve resistance to chloride-containing environments relative to SS 304, and is often selected where moisture or chemical exposure is a consideration.
SS 202 is a lower-nickel austenitic grade that may offer a cost advantage in applications where the corrosion demands are less severe. Grade selection for any specific application should be made with reference to the service environment, the mating materials, and any applicable regulatory or industry requirements. Accurate Fastners' sales team can advise on grade availability for particular order quantities and configurations; grades should be confirmed at the enquiry stage.
Grades shown are those documented for this product in the Accurate Fastners brochure. General material notes are guidance only; confirm grade selection for your environment.
Technical Data
Technical specifications
| Product type | Screw – Phillips Pan Combi Screw with Washer |
|---|---|
| Material | Stainless steel |
| Material grade | SS 304, SS 316, SS 202 |
| Nominal diameter / size | M4 – M6 |
| Length | To be confirmed on enquiry |
| Thread type | Metric |
| Head / form | Pan head with pre-assembled washer |
| Drive / tightening | Phillips cross recess |
| Manufacturing process | Cold forged |
Sizes
Available sizes
Documented size range
M4 – M6
Documented length range
On enquiry
Individual sizes within the documented range, thread pitches and lengths are confirmed at quotation stage.
Applications
Industrial applications
Solar Panel Mounting Structures
Combi screws in SS 304 or SS 316 may be used to fasten panel frames and mounting rails where a wide bearing surface helps protect aluminium or coated steel substrates from indentation over extended service life.
LED Lighting Enclosures
The pre-assembled washer assists in distributing clamping load on thin sheet metal enclosures and housings, where a plain screw head may otherwise deform or mark the material surface during production assembly.
Food & Beverage Equipment
SS 316 grade variants may be considered for food processing machinery panels and covers, where stainless steel fasteners are commonly specified to meet hygiene requirements and to resist frequent wash-down exposure.
Pharmaceutical Machinery Panels
In pharmaceutical machinery fabrication, stainless steel combi screws are used for securing access panels and guards, where the integrated washer reduces loose part count and simplifies cleaning validation of the assembly.
RO Water Purifier Assemblies
Compact M4 to M6 stainless combi screws are used in water purifier frame and casing assemblies, where corrosion resistance and a neat fastener profile are practical considerations in compact, moisture-present enclosures.
Featured for: RO Water Purifier, LED Lighting
Features & Selection
Features and selection considerations
Design features
Pre-Assembled Captured Washer
The washer is retained on the shank prior to installation, eliminating it as a separate loose component and helping to ensure consistent washer placement across every joint in a production run.
Cold Forged Construction
Cold forging refines the grain structure of the stainless steel, producing a fastener with good surface integrity and dimensional consistency through the head-to-shank transition without secondary machining of the forged profile.
Phillips Cross-Recess Drive
The Phillips recess is compatible with standard powered and manual Phillips bits, supporting efficient installation in both workshop and field settings using widely available tooling.
Metric Thread Form
Metric threading from M4 to M6 allows engagement with standard metric nuts, inserts, and tapped holes, making these screws straightforward to specify alongside other metric hardware in an assembly.
Three Stainless Steel Grade Options
Availability in SS 202, SS 304, and SS 316 allows grade selection to be matched to the corrosion demands and budget requirements of the specific application and service environment.
Before you order
Diameter & Thread Length
Specify the nominal diameter from the M4–M6 range and confirm the required thread length and overall screw length with Accurate Fastners at enquiry stage, as these parameters depend on joint stack thickness and thread engagement requirements.
Grade Selection
Choose between SS 202, SS 304, and SS 316 based on the service environment. SS 316 is generally preferred where chloride or moisture exposure is anticipated; SS 202 may be considered for less demanding indoor applications.
Mating Components
Confirm that the mating nut, insert, or tapped hole is also metric and compatible in diameter and pitch. Mixing thread standards or using mismatched pitches may result in poor thread engagement and joint reliability.
Quantity & Documentation
For volume orders, request a formal quotation including material grade, batch documentation, and quality check records. Accurate Fastners' quality control team performs checks at procurement and delivery; documentation requirements should be stated at enquiry.
FAQs
Frequently asked questions
What sizes are available for the Phillips Pan Combi Screw with Washer?
The screw is available in metric diameters from M4 to M6. Thread length and overall length options should be confirmed directly with Accurate Fastners at the time of enquiry, as these depend on the specific application requirements.
Which stainless steel grades are offered for this screw?
Accurate Fastners manufactures this screw in SS 202, SS 304, and SS 316. Grade selection should be guided by the service environment, exposure conditions, and any applicable industry standards. The sales team can advise on availability for specific quantities.
Can the integrated washer be removed or replaced?
The washer is pre-assembled and captured on the shank as part of the combi screw design. It is intended to remain in place throughout installation. If a different washer size or material is needed, this should be discussed with the sales team at the enquiry stage.
Is this screw compatible with a Pozidriv bit?
No. This product uses a Phillips cross recess, which has different flank geometry from the Pozidriv pattern. Using a Pozidriv bit on a Phillips recess may increase the risk of cam-out and drive damage. Standard Phillips bits should be used.
What standards does Accurate Fastners' fastener range comply with?
Accurate Fastners' broader fastener range is stated to comply with IS, BS, and DIN standards. The applicable standard for a specific product configuration should be confirmed with the sales team at the time of placing an enquiry or order.
How can I request a quotation for these screws?
You may submit an enquiry through the website's enquiry form, send your requirements by email to export@accuratefastners.com, or contact the team via WhatsApp. Please include the grade, diameter, length, and required quantity for an accurate quotation.
Related Products
Complementary fasteners
- DIN 912304 · 316 · 202
DIN 912 Socket Head Cap Screw (Allen Cap Screw)
Size: M3 – M16
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