Brass Pan Head Machine Screws – DIN 7985 / ISO 7045

Brass Pan Head Machine Screws – DIN 7985 / ISO 7045

Electrical Accessories India manufactures Brass Pan Head Machine Screws to DIN 7985 (ISO 7045) with Phillips (cross) recess and slotted drive, in free-cutting brass CW614N / CZ121 / C36000. Pan head machine screws feature a low-profile, broad-bearing cylindrical head with a slightly domed top surface, providing greater underhead bearing area than countersunk or round head designs. This geometry makes them the preferred fastener for electrical panel assembly, DIN rail component mounting, PCB standoff attachment, instrument housing assembly, terminal block clamping, contactor cover fastening, and switchgear cabinet manufacture. Brass pan head screws are non-magnetic, corrosion-resistant, and thermally stable from –40°C to +120°C, meeting the exacting demands of electrical OEMs, EPC contractors, power utilities, and industrial distributors worldwide.

Product Overview

Pan Head Geometry and Standards

The pan head profile (DIN 7985 / ISO 7045) is characterized by a cylindrical head body, flat underside bearing surface, and a slightly domed (convex) top. Head height is approximately 0.7× the nominal screw diameter, and head diameter is approximately 2× the nominal diameter, providing a generous load distribution area on soft substrates such as aluminium panels, GRP enclosures, and PVC-lined switchgear. This compares favourably with cheese head (DIN 84) – which has greater head height and smaller bearing diameter – and is significantly more corrosion- and cam-out resistant than round head (DIN 96) in production line assembly. Brass pan head machine screws conform to DIN 7985 for cross recess (Phillips/Pozidriv) and DIN 85 for slotted, with equivalent ISO 7045 (cross recess) and ISO 1580 (slotted) designations.

Material Grade and Machinability

Standard production alloy is CW614N (EN) / CZ121 (BS) / C36000 (UNS) – free-cutting brass with 57–59% copper, 2.5–3.5% lead (for machinability), and balance zinc. This alloy has a machinability index of 100% (the reference standard for all metals), enabling high-speed multi-spindle automatic screw machining with excellent surface finish and tight dimensional tolerances. For RoHS/REACH-compliant assemblies, lead-free grades CW617N (DZR brass, ≤0.09% Pb) and CW724R (silicon brass, Pb-free) are available. Indian Standard IS 319 Type I (leaded) and IS 319 Type II (unleaded) are the domestic equivalent grades used in BIS-certified supply chains.

Drive Type Options and Selection

The most common drive for brass pan head machine screws is Phillips (PH) cross recess, available in PH1 (M1.6–M2.5), PH2 (M3–M5), and PH3 (M6–M8) sizes, enabling high-speed powered screwdriver assembly. Pozidriv (PZ) is specified where higher drive engagement and lower cam-out risk are required (PZ1, PZ2, PZ3). Slotted pan head screws (DIN 85 / ISO 1580) are preferred for site maintenance applications where a flat-blade screwdriver is universally available. Torx (TX) drive (ISO 14583) is increasingly specified for tamper-resistant outdoor electrical cabinets. Allen/Hex socket pan head screws offer high torque transmission for precision structural applications. Combination (Slot + PH) provides dual-tool flexibility on panels assembled in factory and maintained in field.

Thread Forms and Size Range

Pan head brass machine screws are produced in ISO Metric Coarse thread (standard, most common for new OEM designs), ISO Metric Fine (for vibration environments or thin-wall chassis), UNC (Unified National Coarse, No.2-56 through 3/8″-16 – common for North American electrical equipment), UNF (Unified National Fine), and BA (British Association threads, 0BA–10BA, for legacy UK switchgear). Standard metric range: M1.6 to M10, lengths 3 mm to 60 mm. Inch range: No.2 (2-56) to 3/8″-16 UNC. BA range: 0BA to 10BA. Extra-long screws up to 150 mm and special pitches manufactured to order. Thread tolerance 6g per ISO 965-2.

Surface Finishes for Electrical Applications

Standard supply is bright natural brass (mill finish). Electroplated finishes available: nickel plating (3–15 µm, EN 12540, good corrosion resistance, silver appearance), tin plating (3–10 µm, solderable, suitable for PCB applications), chrome plating (decorative), zinc plating (6–12 µm, Fe passivated), gold plating (0.5–2 µm on nickel undercoat, for aerospace and precision instruments), and satin/bead-blasted finishes for aesthetic applications. Nickel-plated brass pan head screws (M3, M4, M5 PH2) are the most widely specified finish for professional electrical panel assemblies in switchgear, instrumentation, and control panel manufacturing.

Applications in Electrical OEM Manufacturing

Brass pan head machine screws are the highest-volume fastener in professional electrical panel assembly worldwide. Key applications include: DIN rail component mounting (MCBs, RCDs, terminal blocks, relays, contactors, timers); instrument panel and control cabinet assembly screws; PCB-to-standoff mounting (M2, M2.5, M3 PH2 pan head); cable harness anchor points and strain relief clamps; cover plate fasteners on distribution boards and junction boxes; earth label and nameplate screws; motor terminal box assembly; generator and UPS panel board fasteners; solar combiner box and inverter chassis screws; and pushbutton/selector switch panel mounting.

PCB and Electronics Applications

M2, M2.5, and M3 brass pan head Phillips machine screws are the standard in PCB mounting – threading into brass standoffs (CW614N) or aluminium chassis tapped holes. Tin-plated M3 pan head screws are used where a grounding tab must be soldered directly to the screw body. The non-magnetic property of brass ensures no interference with hall-effect sensors, magnetometers, or sensitive measurement circuits. Brass screws do not cause ESD risk in MOSFET and IGBT-based power electronics assemblies and are safe for use in RF and microwave enclosures where ferrous fasteners would cause signal distortion.

Mechanical Performance Data

CW614N brass pan head screw typical properties: Tensile strength 380–430 MPa; Proof load 270–310 MPa; Vickers hardness 90–130 HV; Elongation 15–20%; Density 8.5 g/cm³. Recommended maximum tightening torques (dry, CW614N): M3 PH2 pan head: 0.5–0.7 Nm; M4 PH2 pan head: 1.0–1.3 Nm; M5 PH2 pan head: 2.0–2.5 Nm; M6 PH3 pan head: 3.5–4.5 Nm. Exceeding these torques risks thread stripping in brass standoffs – specify stainless steel or silicon bronze for higher clamp load requirements.

Key Features

• Head profile: DIN 7985 / ISO 7045 pan head – low profile, broad bearing, domed top
• Material: Free-cutting brass CW614N / CZ121 / C36000; lead-free CW617N / CW724R available
• Drive types: Phillips PH1/PH2/PH3, Pozidriv PZ1/PZ2, Slotted, Torx TX, Allen, Combination
• Thread: M1.6–M10 ISO Metric; No.2 to 3/8″ UNC/UNF; 0BA–10BA (British Association)
• Length range: 3 mm to 60 mm standard; up to 150 mm special order
• Surface finish: Natural / Nickel / Tin / Chrome / Zinc / Gold plated
• Compliant with DIN 7985, ISO 7045, DIN 85, ISO 1580, BS 57, ASME B18.6.3 standards
• EN 10204 3.1 Material Test Certificate; REACH / RoHS declarations available
• Non-magnetic, corrosion-resistant, thermally stable –40°C to +120°C
• Compatible with automated vibratory bowl feeder assembly systems

Corrosion Resistance and Environmental Performance

Bare brass pan head screws provide Class C2–C3 corrosion resistance (ISO 9223) suitable for dry and mildly humid indoor electrical enclosures. Nickel-plated versions achieve 200+ hours Neutral Salt Spray per ASTM B117, appropriate for IP54/IP65 outdoor switchgear and junction boxes in tropical or coastal environments. For marine applications, consider silicon bronze (CW706R) or A2/A4 stainless steel alternatives available in our range. Brass pan head screws are galvanically compatible with copper, brass, and bronze – minimal risk of bimetallic corrosion in indoor panel assemblies.

BA Thread Pan Head Screws for Legacy UK Switchgear

British Association (BA) thread brass pan head screws are stocked in 0BA to 10BA (equivalent to M6 down to M1.4 approximately) for maintenance of legacy UK-manufactured electrical switchgear and instruments, including GEC, Reyrolle, AEI, English Electric, Brush, ABB UK, and Siemens UK-manufactured protection relays, switchgear panels, and instrumentation. BA thread pan head screws are also specified for telecommunications equipment, railway signalling, postal sorting equipment, and scientific instruments. Available in slotted (BS 57) and combination (Slot+PH) drive.

Thread Locking and Vibration Resistance Options

Standard brass pan head screws can be enhanced with thread-locking features for vibration-prone assemblies: nylon patch pre-coating (DIN 267 Part 28 compliant, no separate washer required), pre-applied micro-encapsulated anaerobic thread locker (Loctite 243 equivalent, activated on assembly), or specification with spring washer (pair with DIN 127 brass spring washer). For the highest vibration resistance without secondary locking, specify our Brass SEMs Screws (combination washer) which provide captive flat + spring washer in a single-piece assembly.

Technical Specifications

Pan Head Screw Dimensions – ISO 7045 (Cross Recess) – Selected Sizes

International Material Grade Equivalents

Product Types / Variants

Applications in Industry

Manufacturing Process

Brass pan head machine screws are manufactured by two primary methods depending on size. For sizes M1.6–M5, Swiss-type multi-spindle automatic screw machining is used: free-cutting brass bar stock (CW614N) is precision-turned to form the pan head profile, cross-recessed (Phillips/Torx) or slot-milled, then thread-cut or thread-rolled. For sizes M5–M10, cold heading in multi-stage heading tools produces the pan head blank with a net-shape formed head – eliminating swarf and improving material utilisation. Threads are then rolled (preferred for higher tensile strength and surface quality) or cut. All screws undergo automated optical inspection for head fill, drive recess depth and form, thread start quality, and overall length. Batch sampling per ISO 3269 AQL 1.0. GO/NO-GO thread gauging per ISO 1502 is conducted on 100% of production for sizes M2–M6 and on AQL sample basis for larger sizes.

Quality Standards and Certifications

Why Choose Electrical Accessories India

• ISO 9001:2015 certified manufacturer – in-house multi-spindle screw machining and cold heading in Jamnagar, India
• Widest drive range – Phillips, Pozidriv, Slotted, Torx, Allen, and Combination from a single supplier
• Full metric (M1.6–M10), inch (UNC/UNF), and BA (0BA–10BA) thread range from one source
• Lead-free grades (CW617N, CW724R) for EU RoHS/REACH compliant OEM assemblies
• Competitive pricing: US$ 11.50 per kilogram (EXW Jamnagar) for OEM volume contracts
• Custom head profiles, non-standard drive recesses, and unusual thread forms to drawing
• Proven export experience: UK, USA, UAE, Germany, Australia, South Africa, Brazil
• AQL 1.0 inspection with full batch traceability and EN 10204 3.1 documentation

Frequently Asked Questions (FAQ)

1. What is the difference between DIN 7985 and ISO 7045 for pan head screws?

DIN 7985 and ISO 7045 are technically equivalent standards for pan head cross-recess machine screws. DIN 7985 is the German/European designation; ISO 7045 is the international equivalent. Both specify identical dimensions, tolerances, and drive recess geometry (Phillips or Pozidriv). Either designation may appear on engineering drawings for the same product.

2. Which drive type is recommended for production line electrical panel assembly?

Phillips PH2 pan head screws (M3, M4, M5) are the most common for power screwdriver production assembly in India and internationally. Pozidriv PZ2 is preferred in European OEM assemblies where lower cam-out risk is critical on automated lines. Torx TX20/TX25 is increasingly specified for outdoor and security enclosures where tamper resistance is required.

3. Are brass pan head screws RoHS compliant?

Standard CW614N brass screws contain lead (2.5–3.5%), which is permitted under RoHS Directive 2011/65/EU Annex III exemption for copper alloys (up to 4% lead). For strict RoHS compliance without the exemption claim, lead-free grades CW617N (≤0.09% Pb) and CW724R (Pb-free) are available with full RoHS compliance documentation.

4. What size pan head screws are used for PCB mounting?

M2, M2.5, and M3 pan head Phillips (PH1 for M2/M2.5, PH2 for M3) are the standard PCB mounting screws. M3 × 6 mm and M3 × 8 mm are the most common lengths for PCB-to-brass standoff connections. Tin-plated M3 screws are specified for assemblies where the screw head must be hand-soldered to a ground plane or EMC bonding tab.

5. Do you supply very small brass pan head screws for miniature instruments?

Yes. We manufacture M1.6 and M2 pan head machine screws (DIN 7985, PH1 drive) for miniature relay assemblies, precision instruments, and compact electrical connectors. BA thread screws in 8BA (≈M1.8) and 10BA (≈M1.4) for British miniature instruments are also available.

6. Can I order mixed size packs of brass pan head screws?

Yes. We supply assortment packs for distributors (M3×6, M3×10, M4×8, M4×12, M5×10 in one carton). For OEM supply, bulk packing by single size is standard. MOQ is 10 kg per size/drive combination. Sample kits for engineering approval are available on request.

7. What surface finish is best for outdoor electrical enclosure pan head screws?

Nickel-plated brass pan head screws (8–12 µm electrodeposited nickel) are recommended for outdoor IP54/IP65 enclosures. They provide 200+ hours NSS (Neutral Salt Spray) per ASTM B117, acceptable for most tropical and coastal environments. For highly corrosive marine environments, specify silicon bronze or A2 stainless steel equivalents.

8. Are there pan head screws with pre-applied locking adhesive?

Yes. Brass pan head screws with micro-encapsulated anaerobic thread locker (Loctite 243 equivalent) pre-applied to threads are available for vibration-critical applications. The adhesive remains inactive until the screw is installed and tightened, activating at assembly without separate adhesive application. Useful for motor panel and generator panel assemblies.

9. What is the maximum length of brass pan head machine screw available?

Standard range: 3 mm to 60 mm length. Special order lengths up to 150 mm are manufactured with minimum 25 kg per size. Non-standard lengths with 2 mm increments can be quoted with 3–4 weeks lead time.

10. What documentation comes with the screws for quality-critical OEM assemblies?

Standard: Dimensional inspection report, chemical composition certificate (Type 2.2 per EN 10204). On request: EN 10204 Type 3.1 Material Test Certificate (independent laboratory), RoHS compliance declaration, REACH SVHC declaration, ISO 9001 certificate, and country-specific regulatory documentation (BIS, CE marking support documents).

Equivalent Terms – Multilingual Reference

Related Products and Internal Links

• Brass Machine Screws – full range including Pan, CSK, Round, Cheese, and Hex head profiles
• Brass SEMs Screws – pan head with captive washer (flat, spring, combination) for vibration-resistant assemblies
• Brass Flat Head (CSK) Machine Screws – countersunk screws for flush-surface mounting
• Brass DIN 934 Hex Nuts – standard hex nuts for use with pan head machine screws
• Brass Panel Nuts – thin hex nuts for sheet metal and panel applications
• Brass Standoffs – PCB and panel spacing posts for use with M2–M6 pan head screws
• Brass Spacers – precision spacing components for electrical assembly
• Brass Thumb Screws – tool-free panel access fasteners
• Related search terms: DIN 7985 brass screws, ISO 7045 brass machine screws, pan head Phillips screws, cross recess machine screws, panel fasteners, PCB mounting screws, electrical panel screws

Request a Quote – Brass Pan Head Machine Screws

Electrical Accessories India supplies Brass Pan Head Machine Screws (DIN 7985 / ISO 7045) to electrical OEMs, EPC contractors, switchgear manufacturers, panel builders, and distributors worldwide. Indicative price: US$ 11.50 per kilogram (EXW Jamnagar, India). Bulk pricing, OEM annual contracts, and custom specifications available.

Email: sales@elecaccs.com | Phone: +91-22-43449300, +91-22-43449323 | Location: Plot 10, GIDC Industrial Estate, Shanker Tekri, Udyog Nagar, Jamnagar 361004, Gujarat, India

Export Markets: USA, UK, UAE, Germany, Australia, South Africa, Brazil, Southeast Asia, East Africa

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