CL02 Clutch Head Raised Countersunk Security Screws
Raised countersunk head one-way clutch head security screw, M3.5 as tabulated: head diameter 6.7 mm, head height 2.1 mm. The collected availability matrix carries no legible markings, so lengths are confirmed at quotation; positioned for electrical fittings and enclosures.
Last updated: 2026-11
Specifications
CL02 narrows the clutch head line to a single, deliberately chosen size: M3.5, the thread the electrical trade uses for accessory plates, enclosure lids and switchgear fittings. The head is raised countersunk — the conical seat locates flush in a standard countersink while the shallow dome stays proud enough to keep the slotted drive usable, which matters on a one-way screw that must still be drivable on site with nothing more than a flat-blade screwdriver. The collected table gives a 6.7 mm head diameter and 2.1 mm head height for the single tabulated thread. The drive principle is the same as the rest of the line: chamfers flanking the slot let the screw turn in one direction only, so a public-facing electrical fitting can be installed by any fitter and then resists opening with ordinary tools. The collected availability matrix prints length rows with no legible markings, so no lengths are claimed on this page — availability is confirmed against your size mix at quotation, and the collected source notes non-standard sizes and materials can be made to order, including parts made to drawings.
| Designation | CL02 — raised countersunk head security screw, clutch head one-way drive; conical seat with a shallow driving dome |
|---|---|
| Thread range (tabulated) | M3.5 (single size — the electrical-trade thread) |
| Head diameter dk (mm) | M3.5 6.7 |
| Head height m (mm) | M3.5 2.1 |
| Length availability | No legible markings in the collected availability matrix — confirmed at quotation |
| Application (source-stated) | Electrical applications; public areas where maintenance is not required but security matters |
| Security principle | One-way permanent fixing — standard slotted screwdriver installs; anti-clockwise torque slips out |
Materials
- Confirmed at quotation (collected page states no standard material line)
Ordering & documentation
Documents
Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.
Quotation
- The fastener family (CL02 Clutch Head Raised Countersunk Security Screws) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
- Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
- Quantity per size and your target delivery date.
- Destination country, and any required documents (for example a mill test certificate) so the quote includes them.
Sample & supply
Minimum order quantity is 10,000 pieces. Stock items run 3–7 days. Quantities or variants outside the standard range are confirmed at quotation.
Storage & shipping
Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.
Frequently asked questions
Why would a whole SKU be a single thread size?
Because the application is a single trade standard. M3.5 is the size the electrical industry uses for accessory and enclosure fixings, and the collected source positions this SKU squarely there. Concentrating one SKU on one size keeps the raised-countersunk clutch head available as a catalogue item for switch plates, consumer units and public-facing electrical enclosures rather than a made-to-order special.
What lengths can I order?
The collected matrix lists length rows but marks no cells legibly, so this page does not quote lengths — treating length as a quotation line is the honest position. State the length on the RFQ alongside the M3.5 thread and the supply schedule comes back with the quote; the source confirms non-standard lengths can be made to order.
What is the MOQ and lead time for these security screws?
Minimum order quantity is 10,000 pieces per item. Stocked sizes ship in 3–7 days; sizes quoted as available to order, and non-standard sizes or materials, are quoted with a confirmed schedule. Confirm the exact schedule against quantity and size mix at quotation.
What should an RFQ for these security screws state?
State the designation code (CL01 through CL06) and head style, the drive (clutch head one-way — fitted with a standard slotted screwdriver), nominal thread size and length, material and finish, the substrate or mating part, required certificates, and quantity per size — plus destination country.
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Request a Quote
Get factory-direct pricing from the manufacturer.
What to include in your inquiry
- ✓ Standard and property class (e.g. DIN 912, ISO 4762, class 8.8) — or a drawing for custom parts.
- ✓ Sizes, lengths and thread type (metric or inch).
- ✓ Quantity per size and your target delivery date.
- ✓ Destination country, plus any coating or finish requirement.
- ✓ Any documents you need with the shipment (e.g. mill test certificate) so the quote includes them.
- ✓ Your inquiry goes straight to the factory team by email and gets a reply within 24 hours.
- ✓ Factory-direct pricing
- ✓ Standard and custom specifications
- ✓ Factory-direct export to buyers in Europe, Asia, the Americas and the Middle East
- ✓ Full fastener family support