CL03 Clutch Head Round Self Tapping Security Screws
Round head one-way clutch head self-tapping security screws, No.4–No.14 as tabulated: head diameters 5.4–11.7 mm, head heights 2.2–4.4 mm. A2/304 stainless steel as standard; thread sizes No.4 (2.9 mm) to No.14 (6.3 mm). No lengths published — availability matrix unmarked.
Last updated: 2026-11
Specifications
CL03 takes the clutch head one-way drive onto sheet metal and plastics: a self-tapping thread that cuts its own path — no nuts, no pre-tapped holes — under the same slotted, chamfer-flanked head that goes in with any standard screwdriver and refuses to come back out the same way. The collected tabulation runs sheet gauges No.4 to No.14, head diameters from 5.4 mm to 11.7 mm, head heights from 2.2 mm to 4.4 mm, and the source states the standard supply as No.4 (2.9 mm) to No.14 (6.3 mm) thread sizes manufactured from A2/304 stainless steel — the only page in this batch with an explicit standard material line and a corrosion-resistant one, fitting the public-facility and washdown-adjacent ground this fixing family is named for. The design is classed for medium-torque applications; like every one-way clutch head screw it is a permanent fixing, so plan the joint on the assumption it will not be reopened with ordinary tools. The collected availability matrix carries no legible length markings, so lengths are confirmed at quotation.
| Designation | CL03 — round head self-tapping security screw, clutch head one-way drive; thread-cutting into sheet metal and plastic |
|---|---|
| Gauge range (tabulated) | No.4, No.6, No.8, No.10, No.12, No.14 |
| Head diameter dk per gauge (mm) | No.4 5.4 · No.6 6.3 · No.8 7.6 · No.10 8.8 · No.12 10.4 · No.14 11.7 |
| Head height k per gauge (mm) | No.4 2.2 · No.6 2.5 · No.8 2.9 · No.10 3.4 · No.12 3.9 · No.14 4.4 |
| Length availability | No legible markings in the collected availability matrix — confirmed at quotation |
| Security principle | One-way permanent fixing — installs with a standard slotted screwdriver; anti-clockwise torque slips out |
| Materials (collected) | A2/304 stainless steel as standard; non-standard sizes, materials and finishes to order, including parts made to drawings |
Materials
- A2/304 stainless steel
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 (CL03 Clutch Head Round Self Tapping 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
Where does a stainless one-way self-tapper earn its place?
On public sheet-metal that will never see a maintenance schedule: cubicle partitions, washroom panels, signage backing, vending machine housings. Self-tapping removes the nut and the pre-tapped hole from the process, stainless carries the damp and cleaned-down environment, and the one-way drive means the enclosure stays closed to anyone armed with a screwdriver picked up on site.
What pilot hole does a self-tapping security screw need?
Self-tapping cuts its own internal thread but still depends on the correct pilot hole for the gauge and substrate — too small and the screw binds or the panel distorts, too large and the thread is shallow. The collected table tabulates nominal thread diameters per gauge (No.4 at 2.9 mm through No.14 at 6.3 mm) which size that calculation. Confirm the pilot against the substrate at quotation.
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.
Related knowledge
- Thread-Forming vs Thread-Cutting vs Thread-Rolling Self-Tapping Screws: What the Evidence Settles on Base Material
- Screw Family Selection by Base Material: Wood, Machine and Self-Tapping Threads, Engagement and Coating
- Hex Bolts vs Socket Head Cap Screws: What the Evidence Settles on Strength, Clearance and Cost
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