Series CFE & CFEO Self-Locking Self-Clinching Nuts
Self-locking self-clinching nuts, Series CFE & CFEO — 300 series stainless steel clinch nuts with internally threaded 3B / 6H classes, black dry-film lubricant finish per MIL-46010 Type I over cadmium, locking performance equivalent to NASM25027. Unified #4-40 to 1/4-28 and metric M3 to M6.
Last updated: 2026-11
Specifications
Series CFE and CFEO are self-clinching nuts: internally threaded inserts that press into a properly sized mounting hole in thin sheet and cold-flow the sheet material into a groove, locking themselves in place to provide strong, reusable threads in a minimum of space. The locking versions carry dry-film lubricant per MIL-46010 Type I over cadmium, and the collected sheet rates their thread-locking performance as equivalent to applicable NASM25027 specifications. Threads are internal 3B per ANSI B1.1 (6H per ANSI/ASME B1.13M for metric). The collected table runs unified #4-40 through 1/4-28 and metric M3 x 0.5 through M6 x 1.0, each with its minimum sheet-thickness column (0.060 in. unified, 1.02/1.53 mm metric) and shank geometry. The non-locking counterparts are Series CFEX & CFEOX; where vibration must not loosen the screw, the locking series is the one to quote.
| Series | CFE & CFEO — self-locking self-clinching nuts (locking performance equivalent to applicable NASM25027 specifications per the collected sheet) |
|---|---|
| Thread range (unified) | #4-40, #6-32, #8-32, #10-32, 1/4-20, 1/4-28 — internal 3B per ANSI B1.1 |
| Thread range (metric) | M3 x 0.5, M4 x 0.7, M5 x 0.8, M6 x 1.0 — internal 6H per ANSI/ASME B1.13M |
| Finish | Black dry-film lubricant per MIL-46010 Type I over cadmium |
| Material | 300 series stainless steel; use in sheet materials with Rockwell hardness of B-70 or less |
| Minimum sheet thickness (sampled) | #4-40: 0.060 in.; M3: 1.02 mm (CFEO) / 1.53 mm (CFE); M6: 1.53 mm |
| Hole diameter D (sampled) | #4-40: 0.172 in. max / 0.145 in. min; M3: 4.39 mm max / 3.96 mm min; M6: 8.74 mm max / 7.72 mm min |
| Installation force (sampled, cold-rolled steel sheet) | #4-40 at 0.040 in. sheet: 1500 lbs; M3 at 1.0 mm: 6.7 kN; M6 at 1.5 mm: 15.6 kN |
| Pushout (sampled, cold-rolled steel sheet) | #4-40 at 0.040 in.: 135 lbs; M3 at 1.0 mm: 600 N; M6 at 1.5 mm: 1800 N |
| Torque-out (sampled, cold-rolled steel sheet) | #4-40 at 0.040 in.: 10 in.-lbs; M3 at 1.0 mm: 1.3 N·m; M6 at 1.5 mm: 11.3 N·m |
| MOQ / lead time | Not owner-confirmed for this family — confirmed at quotation |
Materials
- 300 series 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 (Series CFE & CFEO Self-Locking Self-Clinching Nuts) 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 quantities and lead times for this family are confirmed at quotation — send your sizes, grades and quantities on the RFQ and the quote will carry a firm schedule. Sample availability is confirmed with the 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
What sheet hardness can these clinch nuts be installed into?
The collected specification sheet rates the series for use in materials with Rockwell hardness of B-70 or less. Harder sheets resist the cold-flow that locks the nut in place; if your sheet is harder than HB B-70, state the hardness on the RFQ so the fastener type can be confirmed before ordering.
How strong is the installed thread?
The collected sheet tabulates installation force, pushout and torque-out per thread size and sheet series — sampled at #4-40 on 0.040 in. cold-rolled steel: 1500 lbs installation force, 135 lbs pushout, 10 in.-lbs torque-out; at M6 on 1.5 mm steel: 15.6 kN, 1800 N and 11.3 N·m. Pushout is the axial force that ejects the nut; torque-out is the torsional resistance of the installed thread. Use the table row for your thread size and sheet as the reference figure and confirm the sheet material on the RFQ.
What should an RFQ for these self-clinching nuts state?
State the series (self-locking CFE/CFEO or non-locking CFEX/CFEOX), thread size and pitch (for example #10-32, 1/4-28, M4 x 0.7), sheet material and thickness, and sheet hardness where known (the collected sheet rates use in materials up to Rockwell B-70), plus quantity per size and destination country. Commercial terms are confirmed at quotation.
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