Screws · DIN 7982
DIN 7982 Phillips CSK Self Tapping Screw
Accurate Fastners manufactures DIN 7982 Phillips countersunk self-tapping screws in stainless steel grades SS 304 and SS 316, produced by cold forging across ST sizes M2.9 to M6.3 and lengths of 6.5 mm to 50 mm.
- Standard
- DIN 7982
- Grades
- 304 / 316
- Size
- M2.9 – M6.3 (ST sizes)
- Length
- 6.5 mm – 50 mm
Overview
What is the DIN 7982 Phillips CSK Self Tapping Screw?
DIN 7982 is a European dimensional standard that defines countersunk-head self-tapping screws with a Phillips cross recess. Self-tapping screws are designed to form or cut their own mating thread as they are driven into a pre-drilled or pre-punched pilot hole in sheet metal, thin-gauge steel, plastic, or similar substrates, eliminating the need for a pre-tapped nut or insert in many assemblies.
The countersunk (flat) head geometry of the DIN 7982 form sits flush with or below the surface of the mating material once fully driven. This flush-seating characteristic is particularly useful in assemblies where a protruding head would obstruct movement, create a snag point, or interfere with a mating panel or cover. The Phillips cross-recess drive allows consistent torque application with widely available tooling, including both manual screwdrivers and powered drivers.
Accurate Fastners produces these screws by cold forging, a process in which the fastener form is shaped at or near room temperature under high pressure. Cold forging typically yields a denser grain structure compared with machined alternatives, which may contribute to dimensional consistency across a production batch. Each screw carries a self-tapping thread profile conforming to the DIN 7982 specification, sized in the ST (sheet-thread) series from ST 2.9 through ST 6.3.
In Depth
Product description
Construction and Geometry
The DIN 7982 screw features a flat countersunk head with an included angle that conforms to the standard, allowing it to recess cleanly into a chamfered or countersunk hole. The Phillips recess is formed integrally during cold forging, maintaining uniform depth and cam-out resistance across the drive cavity. The shank carries a coarse self-tapping thread suited to sheet-metal engagement.
Available in lengths from 6.5 mm to 50 mm, the screws accommodate a range of material stack thicknesses. The ST sizing convention — M2.9, M3.5, M3.9, M4.2, M4.8, M5.5, and M6.3 as typical DIN 7982 sizes — defines the nominal thread outer diameter. Actual size availability within this range should be confirmed with the Accurate Fastners sales team at the point of enquiry.
Functional Behaviour in an Assembly
When driven into a pilot hole of the appropriate diameter, the self-tapping thread displaces or cuts the surrounding material to form a mating thread, creating a mechanical interlock without a separate nut. The countersunk head draws itself progressively into the countersink as torque is applied, producing a clamping force across the joint once the head is fully seated. This makes the fastener well suited to flush-panel assemblies.
Because the thread forms its own engagement, the torque required to drive and seat the screw is higher than for a machine screw threading into a pre-tapped hole. The correct pilot-hole diameter for each ST size, and the recommended material thickness relative to thread engagement length, should be verified against DIN 7982 or relevant engineering references before finalising a design.
How It Differs from Similar Fasteners
DIN 7982 differs from DIN 7981, which specifies a pan head (raised, domed) rather than a countersunk head. Where DIN 7981 leaves the head proud of the surface, the DIN 7982 countersunk form sits flush, which changes both the aesthetics and the load path at the joint. Users specifying head style should confirm which profile suits their assembly before ordering.
Compared with a machine screw (such as a DIN 965 or ISO 7046 countersunk screw), the DIN 7982 self-tapping variant does not require a threaded insert or nut on the reverse side of thin sheet material. However, because the thread is formed in the parent material rather than in a precision-tapped thread, the engagement strength depends heavily on the substrate material and thickness, and this should be considered during design.
Material & Grade
Material and grade information
- SS 304
- SS 316
Accurate Fastners supplies DIN 7982 screws in SS 304 and SS 316 stainless steel. SS 304, an austenitic grade containing nominally 18 % chromium and 8 % nickel, is widely used in general indoor and moderate outdoor environments where resistance to oxidation and ease of cleaning are priorities. It is a common choice across food-processing equipment, LED lighting enclosures, and general sheet-metal assemblies.
SS 316 incorporates molybdenum — typically around 2 %–3 % — in addition to the chromium-nickel base, which generally improves resistance to chloride-induced pitting and crevice corrosion compared with SS 304. This may make SS 316 a more appropriate consideration for assemblies exposed to saline atmospheres, chemical-cleaning agents, or pharmaceutical-grade hygiene requirements. Grade selection should be based on the specific service environment and should be confirmed with a qualified engineer.
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 – DIN 7982 Phillips CSK Self Tapping Screw |
|---|---|
| Material | Stainless steel |
| Material grade | SS 304, SS 316 |
| Applicable standard | DIN 7982 |
| Nominal diameter / size | M2.9 – M6.3 (ST sizes) |
| Length | 6.5 mm – 50 mm |
| Thread type | Self-tapping thread |
| Head / form | Countersunk (flat) head |
| Drive / tightening | Phillips cross recess |
| Manufacturing process | Cold forged |
Sizes
Available sizes
Documented size range
M2.9 – M6.3 (ST sizes)
Documented length range
6.5 mm – 50 mm
Individual sizes within the documented range, thread pitches and lengths are confirmed at quotation stage.
Applications
Industrial applications
Solar Energy Panel Frames
Flush-head self-tapping screws may be used to attach thin sheet-metal covers and junction-box lids to solar panel frames, where a protruding head could interfere with mounting rails or adjacent panels.
LED Lighting Enclosures
In pressed-steel or aluminium LED luminaire bodies, DIN 7982 screws commonly fasten gear-tray covers and driver-compartment panels flush to the housing, avoiding protrusions that could affect IP-rating gasket seating.
Food and Beverage Equipment
Countersunk self-tapping screws in SS 316 may be used on sheet-metal guards, splash shields, and access panels where flush surfaces ease cleaning and minimise bacterial harbouring points.
Pharmaceutical Machinery Panels
Stainless steel flush-head fasteners in SS 316 can be appropriate for securing inspection covers and sheet-metal guards on process machinery subject to frequent wash-down with cleaning agents.
RO Water Purifier Cabinets
The countersunk profile suits the thin-gauge sheet-metal enclosures of RO purifier units, where self-tapping screws provide a quick assembly method and a flat external surface on outer panels.
Featured for: LED Lighting
Features & Selection
Features and selection considerations
Design features
Flush Countersunk Head
The flat countersunk head sits level with or below the parent material surface once driven, preventing protrusions that could snag, obstruct adjacent components, or interfere with panel-to-panel fitment.
Phillips Cross-Recess Drive
The Phillips recess is compatible with widely available manual and powered screwdrivers, allowing efficient installation in production environments without specialised tooling requirements.
Cold-Forged Construction
Cold forging shapes each screw under high pressure at near-ambient temperature, typically producing a consistent grain structure and dimensional repeatability across the production batch.
Self-Tapping Thread Profile
The DIN 7982 self-tapping thread forms its own mating thread in the pilot hole, enabling direct fastening into sheet metal or suitable substrates without a pre-tapped thread or back-nut.
DIN 7982 Dimensional Conformance
Manufactured to the DIN 7982 standard, these screws offer dimensional interchangeability with other DIN 7982-compliant components, supporting consistent design specification and procurement.
Before you order
Pilot Hole and ST Size
The correct pilot-hole diameter is critical to thread engagement and holding performance. Confirm the ST size — from M2.9 to M6.3 — and the corresponding pilot-hole recommendation against DIN 7982 tables before finalising tooling.
Length Relative to Material Thickness
Choose a length between 6.5 mm and 50 mm that provides sufficient thread engagement in the substrate while avoiding bottoming out or excessive protrusion on the reverse side of the joint.
Grade Selection for the Service Environment
Specify SS 304 for general indoor or dry outdoor use and consider SS 316 for assemblies exposed to moisture, chlorides, or chemical cleaning. Confirm the final grade choice with your design or procurement engineer.
Quantity and Documentation Requirements
When requesting a quotation, provide the required quantity, preferred packaging, and any documentation needs such as material test certificates or compliance declarations, so Accurate Fastners can respond with complete commercial terms.
FAQs
Frequently asked questions
What materials are available for the DIN 7982 Phillips CSK self-tapping screw?
Accurate Fastners supplies these screws in SS 304 and SS 316 stainless steel. SS 304 suits general environments, while SS 316 may offer better resistance to chloride exposure. Grade selection should reflect your specific service conditions and be confirmed with a qualified engineer.
What size range is available?
The screws are available in ST sizes from M2.9 to M6.3 in diameter and 6.5 mm to 50 mm in length. Specific size combinations within this range should be confirmed with the Accurate Fastners sales team at the time of enquiry.
What does DIN 7982 specify?
DIN 7982 is a German dimensional standard defining countersunk-head self-tapping screws with a Phillips cross recess. It specifies head geometry, thread form, and dimensional tolerances, allowing engineers to specify interchangeable fasteners across suppliers conforming to the same standard.
Can these screws be used without a nut or threaded insert?
Yes. The self-tapping thread is intended to form or cut its own mating thread in a pre-drilled pilot hole in sheet metal or suitable substrates. However, engagement performance depends on substrate material and thickness, which should be verified against engineering requirements before use.
What related fasteners does Accurate Fastners supply?
Accurate Fastners manufactures a broad range of fasteners including anchors, nuts and bolts, washers, thread bars, pipe clamps, and stone cladding clamps, as well as other screw types. Contact the sales team to confirm availability of complementary fasteners for your assembly.
How can I request a quotation for DIN 7982 screws?
Submit your requirements — size, grade, quantity, and any documentation needs — via the enquiry form on the website, by emailing export@accuratefastners.com, or by contacting the team directly on WhatsApp. The sales team will respond with pricing and availability details.
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