SB001 Socket Countersunk Barrel Nuts
Internally threaded barrel nuts (sex bolts) with a socket countersunk head, M3–M16, barrels 4.5–22 mm with head diameters 6–30 mm as tabulated. Through-hole or blind-hole (closed) designs, sitting flush for a clean finished face.
Last updated: 2026-11
Specifications
The socket countersunk barrel nut is the flush-finish member of the barrel-nut (sex bolt) family: a female, internally threaded sleeve with a smooth barrel and a countersunk socket head that sits level with the surface once the mating socket countersunk screw is tightened. The collected tabulation spans M3 to M16 — head diameters from 6 mm at M3 up to 30 mm at M16, and barrel diameters from 4.5 mm to 22 mm — with tabulated lengths from 7 mm to 30 mm. Two construction variants exist: a through-hole barrel and a blind-hole (closed-end) barrel where the screw never exits the far face. The head-height row in the collected table is incomplete at some sizes; only the clean single values are carried here. Because nothing protrudes and no thread is cut into the clamped parts, the pairing suits furniture, enclosures, architectural panels and display work where both strength and appearance matter.
| Designation | SB001 — socket countersunk barrel nut (female, internally threaded sleeve; sex bolt half) |
|---|---|
| Thread range (tabulated) | M3, M4, M5, M6, M8, M10, M12, M16 |
| Head diameter dk per thread (mm) | M3 6 · M4 8 · M5 10 · M6 12 · M8 16 · M10 20 · M12 24 · M16 30 |
| Head height k (mm, clean cells) | M3 0.8 · M4 1.8 · M5 2.1 · M8 2.8 · M10 3.3 · M12 4.4 · M16 5.4 (M6 not rendered — source row ambiguous) |
| Barrel diameter d2 per thread (mm) | M3 4.5 · M4 5 · M5 6.5 · M6 8 · M8 11 · M10 14 · M12 16 · M16 22 |
| Lengths (tabulated ladder) | 7, 8, 9, 12, 15, 16, 20, 25, 27, 30 mm |
| Construction | Through-hole or blind-hole (closed end) designs |
| Materials / finishes (collected legend) | A1 stainless steel, A4 stainless steel, zinc-plated steel |
| Mating screw | Socket countersunk screw of the same thread; head sits flush in the countersink |
Materials
- A1 stainless steel
- A4 stainless steel
- Steel, zinc plated
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 (SB001 Socket Countersunk Barrel 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 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
When is a countersunk barrel nut the right sex bolt half?
When the joint face must stay flush. The countersunk head recesses into the surface and the socket countersunk screw closes it off level, so nothing snags or shows — the reason this pattern shows up on furniture, architectural panelling, enclosures and display fixtures. Choose the blind-hole variant when the screw must never protrude through the far face; the through-hole variant suits sandwiched panels where a slight exit is acceptable.
Why do some head-height values not appear for this barrel nut?
The collected tabulation carries an ambiguous head-height cell at M6, and we render only values we can attribute to a single size with confidence. Every other dimension on the page — head diameter, barrel diameter, thread range and the length ladder — is complete from the same source. State the thread and overall length on the RFQ and the exact head height is confirmed on the drawing at quotation.
What is the MOQ and lead time for this nut type?
The minimum order quantity is 10,000 pieces. Stock items ship in 3–7 days; non-stock items are confirmed at quotation. Common diameters in this nut type are widely stocked; confirm the exact schedule against quantity and size mix at quotation.
What should an RFQ for this nut type state?
State the designation (for example the barrel-nut SKU and head style), nominal thread size and pitch, overall barrel length or grip, material and finish (plain, zinc, or stainless where compatible), whether a through-hole or blind (closed) end barrel is required, the mating screw specification, required certificates, and quantity per size — plus destination country.
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