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Barrel Nut

Barrel Nut
Not sure what nut you have?
Two ways to identify it - whichever is easier with what is in front of you.
1If you have the nut

Find the spanner that fits it snugly, then measure the hole. Our nut identification chart lists every metric and imperial nut we stock side by side, sorted by spanner size.

Open the nut identification chart ›

2If you have its bolt

The fastest check is the male thread: the right nut spins onto its bolt by hand with no force. Identify the bolt size and pitch first with our bolt and screw guide, and the nut follows.

Open the bolt and screw guide ›

MATERIALS AND FINISHES

Available finishes: Stainless Steel, Nickel Plated.

GRADES, SIZES AND THREADS

Grades stocked: A2-70 G304, A4-70 G316, Low Tensile Class 4.6.

Sizes: M6 (6mm), M8 (8mm), M10 (10mm), M5 (5mm), M4 (4mm), M3 (3mm), M12 (12mm), M16 (16mm).

Thread systems: Metric - Coarse.

Head styles: Countersunk Head, Button Head, Flat Head.

STANDARDS

ISO 7380.

These barrel nuts pair with our bolts, washers and threaded rod. See our Technical Resources page for tightening torques and spec PDFs.

WHY AUSTRALIA TRUSTS BOLT & NUT

With 15+ years selling fasteners online from Brisbane, we hold over 25,000 stock lines and 200 million pieces — 98.75% of online orders placed before 1pm leave same day. Save more as you buy more — we offer up to 13 price breaks plus 3 spend-tier discounts. Read our customer reviews or get in touch if you need help picking the right product.

View as Grid List

20 Items found

Set Descending Direction
per page

Barrel (connector) nuts are flat-headed cylindrical nuts internally threaded along a protruding boss. Widely used in furniture and flat-pack manufacturing, the head sits against one surface while the boss passes through a clearance hole and accepts a connector bolt from the opposite side. We stock 28+ variants across the barrel nut range.

TECHNICAL RESOURCES

Need help identifying your nut? See our guide to identifying the size of your nut.

Key charts and specification sheets: Specs - Button Post Torx Barrel Nut Metric Coarse Stainless G304 ISO7380 · Specs - Countersunk Post Torx Barrel Nut Metric Coarse Stainless G316

For full sizing data and standards, see our Technical PDFs library.

Filter by :
Filter By
Category
System of Measurement
  1. Metric 20 items
Size
  1. M3 (3mm) 1 item
  2. M4 (4mm) 1 item
  3. M5 (5mm) 2 items
  4. M6 (6mm) 7 items
  5. M8 (8mm) 5 items
  6. M10 (10mm) 4 items
Size & Thread Pitch
  1. M3 x 0.50p Coarse 1 item
  2. M4 x 0.70p Coarse 1 item
  3. M5 x 0.80p Coarse 2 items
  4. M6 x 1.00p Coarse 7 items
  5. M8 x 1.25p Coarse 5 items
  6. M10 x 1.50p Coarse 4 items
Material / Finish
  1. Nickel Plated 3 items
  2. Stainless Steel 17 items
Class / Grade
  1. A2-70 G304 7 items
  2. A4-70 G316 10 items
  3. Low Tensile Class 4.6 3 items
Corrosion Protection Level
  1. Ultimate 9 items
  2. Excellent 7 items
  3. Very Good 3 items
Head Type
  1. Button Head 6 items
  2. Countersunk Head 10 items
  3. Flat Head 4 items
Overall Nut Height Range Guide
  1. 11.80 - 12.20mm 1 item
  2. 14.50 - 15.30mm 3 items
  3. 15.50 - 16.50mm 1 item
  4. 17.50 - 18.30mm 2 items
  5. 19.50 - 20.50mm 3 items
  6. 21.50 - 22.50mm 1 item
  7. 22.50 - 23.50mm 1 item
  8. 24.50 - 25.50mm 1 item
  9. 26.50 - 27.50mm 1 item
  10. 28.00 - 29.00mm 1 item
  11. 28.50 - 29-50mm 1 item
  12. 29.50 - 30.50mm 2 items
  13. 34.50 - 35.50mm 1 item
  14. 35.50 - 36.50mm 1 item
Drive Type
  1. Internal Hex 4 items
  2. Phillips 5 items
  3. Post (Pin) Torx 11 items
Drive Size
  1. 4mm 3 items
  2. 5mm 1 item
  3. PH2 1 item
  4. PH3 3 items
  5. PH4 1 item
  6. T20 1 item
  7. T25 1 item
  8. T30 3 items
  9. T40 5 items
  10. T45 1 item
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