BRASS FLAT HEAD SCREWS, BRASS CSK HEAD SCREWS
Brass Flat Head CSK Head Machine Screws for Flush-Fit Electrical and Panel Assembly
Cable Glands India manufactures brass flat head countersunk (CSK) machine screws to DIN 963, DIN 965, ISO 2009, ISO 7046-1 and IS 1366 dimensions, in slotted and cross-recessed (Phillips/Pozidriv) drive types. The 82°/90° countersunk head seats flush with the mating surface, making these screws the standard choice for terminal blocks, name-plates, switchgear covers and any application requiring a smooth, snag-free finish. Price: US$ 14.50/kilogram (FOB/CIF Indian port, ex-works Mumbai, price subject to size, drive type and finish).
Product Overview
A brass flat head countersunk machine screw has a conical head that seats into a matching countersunk hole, finishing flush with or slightly below the surface of the component being fastened. This flush profile is specified wherever a projecting screw head would interfere with an adjoining part, present a snag hazard, or spoil the appearance of a visible panel, nameplate or enclosure cover.
Cable Glands India manufactures CSK machine screws in slotted drive (DIN 963/ISO 2009) for general-purpose use and traditional appearance, and cross-recessed drive – Phillips (DIN 965/ISO 7046) and Pozidriv – for faster powered-driver assembly on production lines and field installation, reducing cam-out and stripped heads compared with slotted drive under power tool torque.
Machine screws differ from wood screws and self-tapping screws in that they have a uniform machine-thread form (metric or UNC/UNF) along their full length, intended to mate with a pre-tapped hole or a nut, rather than forming their own thread in the base material. This makes them the correct choice for fastening into tapped holes in brass, steel or aluminium enclosures, terminal blocks and busbar assemblies.
Standard free-cutting brass (CuZn39Pb3) CSK machine screws are used for general indoor electrical assembly, nameplate fixing and terminal block fastening. DZR brass (CW602N/CZ132) screws are recommended for outdoor enclosures, marine equipment and coastal installations where long-term exposure to humidity and salt-laden air would otherwise risk dezincification of the thread.
Head diameter and countersink angle (typically 90° for metric ISO/DIN, 82° for ANSI/ASME inch series) are held to close tolerance to ensure the screw seats flush and centred in the countersunk hole across the full production batch, which is important where multiple screws secure a single cover plate or terminal strip and must present a uniform, aligned appearance.
Surface finishes include plain brass, electro-tin plating and nickel plating, selected according to the visual finish of the assembly and the corrosion environment; nickel-plated CSK screws are commonly specified to match nickel-plated terminal blocks and enclosure hardware.
All CSK machine screws are thread-gauged, head-angle checked and dimensionally inspected before dispatch, with batch traceability maintained back to the raw material heat number, supporting quality documentation required by EPC contractors and OEM panel builders.
Key Features
- 82°/90° countersunk head for flush, snag-free seating
- Slotted (DIN 963/ISO 2009) and cross-recessed (DIN 965/ISO 7046) drive types
- Manufactured to DIN, ISO, IS and ANSI/ASME dimensional standards
- Uniform machine thread for use with tapped holes and nuts
- Machined from free-cutting and DZR brass bar stock
- Plain, tin-plated and nickel-plated finish options
- 100% thread-gauged and head-angle inspected before dispatch
- Custom lengths, drives and head styles manufactured to drawing
Flush-Fit Countersunk Head Geometry
The conical head of a CSK machine screw seats into a matching countersunk hole so the top surface sits flush with, or slightly below, the surrounding material. This is essential wherever a raised screw head would obstruct a sliding cover, catch on cabling, or detract from the appearance of a visible enclosure panel or nameplate.
Slotted vs Cross-Recessed Drive Selection
Slotted drive CSK screws remain specified where a traditional appearance is required or where installation is by hand with a flat screwdriver. Cross-recessed drives (Phillips and Pozidriv) are preferred for powered-driver assembly on production lines, reducing cam-out and driver slip under torque, and are the standard choice for high-volume OEM panel assembly.
Machine Thread Compatibility
The uniform machine-thread form allows these screws to engage pre-tapped holes in brass, steel and aluminium components, or to be used with a matching nut, unlike self-tapping or wood screws which form their own thread. This makes CSK machine screws the correct fastener for terminal blocks, busbar covers and tapped enclosure panels.
Material Selection for Outdoor Duty
Standard CuZn39Pb3 brass CSK screws suit indoor electrical assembly and nameplate fixing. DZR brass (CW602N/CZ132) is recommended for outdoor enclosures, marine equipment and coastal installations to prevent dezincification corrosion of the thread over the installation lifetime.
Dimensional Consistency for Batch Assembly
Head diameter, countersink angle and thread pitch are held to close tolerance across production batches, ensuring uniform, flush seating when multiple screws secure a single cover plate, terminal strip or nameplate, an important visual and functional requirement on OEM panel assemblies.
Compliance with International Standards
Dimensional compliance is verified against DIN 963, DIN 965, ISO 2009, ISO 7046-1, IS 1366 and ANSI/ASME B18.6.3 as applicable, allowing distributors and EPC contractors to reference Cable Glands India CSK machine screws directly in tender bills of materials.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product type | Flat/countersunk head machine screw, slotted or cross-recessed drive |
| Thread size range | M2 to M16 metric; #2 to 3/8″ UNC/UNF |
| Length range | 4 mm to 100 mm (custom lengths on request) |
| Governing standards | DIN 963, DIN 965, ISO 2009, ISO 7046-1, IS 1366, ANSI/ASME B18.6.3 |
| Countersink angle | 90° (DIN/ISO metric), 82° (ANSI/ASME inch) |
| Material | CuZn39Pb3, CuZn36Pb3, CW602N/CZ132 (DZR) |
| Manufacturing process | Cold heading / CNC bar turning + thread rolling + head/drive forming |
| Standard finish | Plain brass (natural) |
| Optional finish | Electro-tin plating, nickel plating |
| Inspection | Thread gauging, head-angle check, dimensional and visual inspection |
| Packing | Bulk cartons, poly bags; export wooden pallets |
| Price | US$ 14.50/kilogram (FOB/CIF Indian port, MOQ and finish dependent) |
Raw Material Grades
| Grade / UNS | Common Name | Cu % | Zn % | Pb % | Typical Use |
|---|---|---|---|---|---|
| C38500 / CW614N | Free-cutting brass | 57-59 | Bal. | 1.5-2.5 | General purpose machine screws |
| C36000 | Free-cutting brass | 60-63 | Bal. | 2.5-3.7 | High-speed cold heading |
| C27200 / CuZn37 | Yellow brass | 63-68.5 | Bal. | <0.3 | Cold-formed heads, better ductility |
| CW602N / CZ132 | DZR brass | 58-64 | Bal. | 1.6-2.5 (+As) | Outdoor, marine, coastal enclosures |
International Equivalent Standards
| Region / Country | Standard | Description |
|---|---|---|
| Germany (DIN) | DIN 963 | Slotted countersunk flat head machine screws |
| Germany (DIN) | DIN 965 | Cross-recessed countersunk flat head machine screws |
| International (ISO) | ISO 2009 / ISO 7046-1 | Slotted / cross-recessed countersunk head screws |
| United Kingdom (BS) | BS 4183 | Countersunk head machine screws |
| India (BIS) | IS 1366 | Slotted countersunk head machine screws |
| USA (ANSI/ASME) | ASME B18.6.3 | Flat countersunk head machine screws, inch series |
Product Types / Variants
| Variant | Description |
|---|---|
| Slotted CSK machine screws | DIN 963 / ISO 2009 profile, flat-blade drive |
| Phillips CSK machine screws | DIN 965 / ISO 7046-1, cross-recessed drive |
| Pozidriv CSK machine screws | Improved cross-recess for reduced cam-out |
| DZR CSK machine screws | Dezincification-resistant for outdoor/marine use |
| Plated CSK machine screws | Tin or nickel plated to match hardware finish |
| Custom CSK machine screws | Special lengths, threads and head styles to drawing |
Applications in Industry
Brass flat head CSK machine screws manufactured by Cable Glands India are used for: fastening terminal block covers and busbar shrouds where a flush surface is required; securing nameplates, rating labels and identification tags to enclosures; fixing switchgear and panel cover plates; assembling brass electrical accessories and connector housings; and general OEM assembly wherever a projecting screw head would interfere with adjoining components or present a safety snag hazard. EPC contractors and panel builders specify brass CSK screws wherever electrical continuity and a flush, professional finish are both required.
Manufacturing Process
| Step | Process Description |
|---|---|
| 1. Raw material selection | Certified brass wire/bar procured against mill test certificate |
| 2. Cold heading | Head and countersunk profile cold-formed on heading machines |
| 3. Thread rolling | Machine thread rolled or cut to required pitch and tolerance |
| 4. Slot/recess forming | Slotted or cross-recess drive formed/milled into the head |
| 5. Deburring | Vibratory or tumbling deburr to remove machining burrs |
| 6. Surface finishing | Plain polish, electro-tin plating or nickel plating as ordered |
| 7. Inspection | Thread gauging, head-angle and dimensional inspection |
| 8. Packing and dispatch | Bulk carton packing, export documentation, mill certificates issued |
Quality Standards and Certifications
Cable Glands India manufactures brass CSK machine screws under an ISO 9001 certified quality management system, to DIN 963, DIN 965, ISO 2009, ISO 7046-1, IS 1366 and ASME B18.6.3 dimensional standards. Raw brass is sourced against mill test certificates confirming chemical composition. RoHS and REACH compliance documentation is available for plated finishes on request. Salt-spray corrosion testing (ASTM B117) can be arranged for DZR and plated batches destined for outdoor or coastal projects. Please confirm the certification package required for your project at the time of enquiry.
Why Choose Cable Glands India
- In-house cold heading, thread rolling and drive-forming capability
- Consistent head-angle and thread quality verified by gauge inspection
- Choice of standard and DZR brass grades for indoor/outdoor duty
- Slotted, Phillips and Pozidriv drives manufactured to customer specification
- Export packing and documentation for direct container/LCL shipment
- Transparent per-kilogram pricing with no hidden tooling charges on standard sizes
Frequently Asked Questions
What is a brass flat head CSK machine screw?
A brass flat head countersunk machine screw has a conical head that seats flush with the surrounding material when installed into a matching countersunk hole, and a uniform machine thread for use with a tapped hole or nut.
What is the difference between a CSK machine screw and a self-tapping screw?
A machine screw has a uniform thread designed to mate with a pre-tapped hole or nut, while a self-tapping screw forms its own thread as it is driven into the base material.
What drive types are available?
Slotted (DIN 963/ISO 2009), Phillips cross-recessed (DIN 965/ISO 7046-1) and Pozidriv drives are available, with custom drive types manufactured to specification.
What is the difference between 82° and 90° countersunk heads?
90° is the standard countersink angle for metric DIN/ISO screws, while 82° is standard for ANSI/ASME inch-series screws; the correct angle must match the countersunk hole for a flush seat.
Are brass CSK machine screws suitable for outdoor use?
Standard brass performs well outdoors; DZR brass grade is recommended for coastal, marine or high-humidity environments to prevent dezincification corrosion.
Can custom lengths or head styles be manufactured?
Yes. Cable Glands India manufactures CSK machine screws to custom lengths, threads, drive types and head styles based on customer drawings or samples.
What certifications are provided?
Mill test certificates are issued as standard. ISO 9001 manufacturing compliance, RoHS/REACH documentation and salt-spray test reports can be provided on request.
What is the minimum order quantity?
Standard catalogue sizes are available from small trial quantities; custom lengths or drives may carry a minimum order quantity depending on tooling requirements.
What is the price of brass CSK machine screws?
Standard pricing is US$ 14.50 per kilogram (FOB/CIF Indian port), varying with size, drive type, brass grade, finish and order quantity.
What is the typical lead time for export orders?
Standard sizes in stock grades typically ship within 2-3 weeks of order confirmation; custom sizes and drives may require 4-6 weeks including first-article approval.
Equivalent Terms in Other Languages
| Language | Brass CSK Machine Screw | Related Term 1 | Related Term 2 | Related Term 3 |
|---|---|---|---|---|
| Spanish | Tornillo de cabeza avellanada de latón | Tornillo para metal de latón | Tornillo ranurado de latón | Tornillo Phillips de latón |
| Russian | Латунный винт с потайной головкой | Латунный винт для металла | Латунный винт со шлицем | Латунный винт Phillips |
| French | Vis à tête fraisée en laiton | Vis mécanique en laiton | Vis fendue en laiton | Vis cruciforme en laiton |
| Portuguese | Parafuso de cabeça escareada de latão | Parafuso mecânico de latão | Parafuso fenda de latão | Parafuso Phillips de latão |
| Italian | Vite a testa svasata in ottone | Vite meccanica in ottone | Vite a taglio in ottone | Vite a croce in ottone |
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Request a Quote
Cable Glands India supplies brass flat head CSK machine screws worldwide to electrical OEMs, EPC contractors, power utilities and distributors, at US$ 14.50/kilogram (FOB/CIF Indian port). Send your drawing, thread size, drive type and quantity requirement to sales@cableglandsindia.com or call +91 22 4344 9300 for a formal quotation and sample dispatch.