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Bolts

Bolts
Not sure what size or thread you have or need?
Two ways to confirm before you order - whichever you already know about your fastener.
1If you know the fastener diameter

Compare your fastener to our visual size guide to confirm size, pitch and length.

Open the identification guide ›

2If you have the spanner or socket

Match your spanner / socket AF (across-flats) to the size it fits - our reference chart covers every metric and imperial size we stock.

Open the spanner size chart ›

Bolts for Structural, Industrial and General Fastening

Bolts hold structural work together — from a single M5 hex bolt in a control panel to an M36 K0 structural assembly fastening steel beams. We stock 3,700+ bolt variants across nine subcategories, with same-day shipping on stocked lines from our Brisbane warehouse. Metric, UNC, UNF, BSW and BSF threads; classes from low-tensile 4.6 up to high-tensile 12.9; stainless A2-70 and A4-70 marine grade; galvanised, zinc, plain black and brass finishes.

Check our reviews from DIYers, tradespeople, builders, manufacturers, government, councils, engineers across Australia.

MATERIALS AND COATINGS

Choose by environment, required strength and finish.

Stainless Steel — Corrosion resistance for external and wet environments. A2-70 G304 for general use, A4-70 G316 for marine and coastal. largely non-magnetic.

Zinc Silver Plated — Bright silver finish, internal use only. Economical electroplated zinc, the default for protected environments.

Galvanised — Hot-dip galvanised carbon steel. Heavier coating than zinc plate; the right choice for outdoor and treated-timber work.

Zinc Yellow Plated — Yellow chromate finish. Used on Sems and select coach bolts.

Plain Black Uncoated — Bare uncoated carbon steel. Used on Grade 9 plow bolts and high-tensile hex bolts where the customer applies their own finish.

Brass — Corrosion resistant, non-sparking, decorative finish. Specialist applications in marine, plumbing and heritage work.

Nylon — Non-conductive, chemically resistant, lightweight. Specialist use in electronics and isolating assemblies.

CLASSES AND GRADES

Australian and international tensile grades stocked across the range.

High Tensile Class 8.8 — The workhorse high-tensile grade. Yield 640 MPa, ultimate 800 MPa. Most metric structural bolts.

High Tensile Class 10.9 — Higher yield (940 MPa, ultimate 1040 MPa). Demanding mechanical applications.

High Tensile Class 12.9 — Premium high tensile. Used on flange bolts where high clamp load is required in a compact head.

Low Tensile Class 4.6 — Economical mild-steel grade for general fastening where high strength isn't required. Coach bolts, coach screws, lower-load structural work.

A2-70 G304 Stainless Steel — The standard stainless grade. Suitable for most external Australian environments.

A4-70 G316 Marine Grade Stainless — For marine, coastal and chemical exposure. Use within 300 metres of the coast.

A4-80 G316 High Tensile Stainless — High-tensile variant of marine grade, comparable strength to Class 8.8 without sacrificing corrosion resistance.

Imperial Grades 5, 8 & 9 — High-tensile imperial classes for UNC/UNF/BSW threads. Grade 9 is the highest, found on plow bolts.

THREAD SYSTEMS

Five thread systems stocked across the bolt range.

Metric Coarse — The Australian default. M3 through M36.

Metric Fine — Fine-pitch metric, used in automotive and precision work.

Unified Coarse (UNC) — North American coarse imperial. Common in imported equipment and plant.

Unified Fine (UNF) — Fine-pitch imperial, similar applications to UNC where finer control of clamp is required.

BSW (British Standard Whitworth) and BSF (Fine) — Original British threads, still used in heritage, restoration and older Australian equipment.

Metric Left-Hand Thread — Reverse-thread metric coarse for applications where right-hand rotation would loosen the fastener.

UNDERSTANDING THREAD PITCH

Thread pitch (metric) is the distance between the peaks of two adjacent threads, expressed in millimetres. A thread pitch of 1.50mm means adjacent threads are 1.50mm apart. All our metric bolts use standard metric coarse pitch unless otherwise specified.

Imperial sizes are measured in TPI (threads per inch). To identify the TPI of an unknown bolt, measure 1" (25.4mm) along the threads with a ruler and count how many thread peaks fall within that span — that number is the TPI. On smaller bolts the threads can be hard to count by eye — use a pen or thin drill bit to step from one thread to the next as you count, and a torch (or your phone light) for better visibility.

HEAD STYLES

Five head styles across the range.

Hex Head — The standard six-sided head, driven with a spanner or socket. The default for general bolting.

Hex Flange Head — Hex head with an integrated washer face. Distributes clamp load and removes the need for a separate washer.

Cup Head — Low-profile domed head with a square section underneath that locks against rotation in timber. Coach bolts only.

Raised Head (Plow) — Flush-mounted countersunk-style head used on plow bolts so cutting edges don't catch.

Countersunk Head — Flush-mounted tapered head used on select coach screws where appearance or clearance matters.

OUR RANGE

Hex Bolts & Set Screws — The workhorse of bolting — hex head, fully or partly threaded, in zinc, stainless, galvanised, brass and nylon, M3 to M30 and 1/4" to 1-1/2".

Hex Flange Bolts — Hexagon head with an integrated washer face under the head. Serrated variants resist loosening; popular in automotive and structural assembly.

Cup Head Coach Bolts — Low-profile domed head with a square section under it that locks against rotation in timber. Used with a nut and washer to fix wood to wood or wood to steel.

Structural K0 Bolts & Nuts — HSFG (High Strength Friction Grip) preassembled bolt, nut and washer sets to AS1252:2016 K0. Hot-dip galvanised Class 8.8 for steel-to-steel structural work.

Coach Screws — Hex-head wood screws — drive straight into timber without a nut. Galvanised Class 4.6 and A4-70 G316 stainless, M6 to M16.

Plow Bolts — Grade 9 high-tensile bolts with a flush countersunk-style head and square neck. For attaching cutting edges to plows and earthmoving blades.

Sems — Bolts pre-assembled with a captive flat or spring washer under the head. Saves time and ensures the washer is never forgotten on the assembly line.

Left Hand Thread Hex Bolts & Set Screws — A2-70 G304 stainless hex bolts with reverse (left-hand) thread for applications where right-hand rotation would loosen the fastener — pedals, fans, cutting tools.

Purlin Flanged Bolts — Hex flange-head bolts to AS1110 for fastening purlins and girts in structural roof framing. Zinc plated Class 8.8 and galvanised Class 4.6.

FREQUENTLY ASKED QUESTIONS

Can stainless fasteners be used with aluminium?

Yes — and for most applications, no special precautions are needed. The combination is widely used in industries where strength and corrosion resistance matter (marine, automotive, structural aluminium). For applications with sustained moisture or salt exposure, a few simple steps (barrier washer, sealant, matched-anodising) prevent any long-term galvanic corrosion concerns. Full guidance: Can stainless fasteners be used with aluminium?

What is the difference between a hex bolt and a hex set screw?

A hex bolt has a plain unthreaded shank under the head with thread only on the lower portion of the shaft, while a hex set screw is fully threaded from head to tip. Both share the same hex head and spanner sizes, but a bolt is typically used where you want clamp without thread running through the joint, and a set screw is used where the entire engagement is threaded.

What does Class 8.8 mean on a bolt?

Class 8.8 is the most common high-tensile metric bolt grade. The first digit (8) indicates ultimate tensile strength in hundreds of MPa (so 800 MPa), and the second (.8) gives the ratio of yield strength to ultimate (yield = 640 MPa). Class 10.9 and Class 12.9 are stronger grades; Class 4.6 is a low-tensile grade for general fastening. Class 8.8 is the workhorse grade for structural steel, automotive engineering, industrial machinery, mining and heavy equipment applications.

When should I use galvanised vs stainless bolts?

Galvanised is the economical choice for outdoor work like timber framing, treated pine and external structural connections — the hot-dip zinc coating gives years of corrosion resistance at lower cost than stainless. A2-70 G304 stainless suits most external Australian environments where galvanised won't pass spec, and A4-70 G316 marine grade is the right choice within 300 metres of the coast or for any environment with salt spray, chemicals or food contact.

What's the difference between UNC, UNF, BSW and BSF threads?

UNC (Unified National Coarse) and UNF (Unified National Fine) are the modern North American imperial thread systems with a 60° thread angle. BSW (British Standard Whitworth) and BSF (British Standard Fine) are older British systems with a 55° thread angle. UNC and BSW are coarse-pitch (larger gaps between threads); UNF and BSF are fine-pitch. UNC and BSW are NOT interchangeable despite both being imperial coarse threads — the angle difference will damage either fastener if mismatched.

Which bolts should I use near the ocean?

A4-70 G316 marine grade stainless is the standard choice for marine, coastal and salt-spray applications. G316 is alloyed with molybdenum which gives substantially better resistance to chloride corrosion than G304. Within 300 metres of the coastline, always default to G316. A4-80 G316 is the high-tensile equivalent for applications that need both marine resistance and Class 8.8-equivalent strength.

What does the K0 marking on a structural bolt mean?

K0 indicates a HSFG (High Strength Friction Grip) bolt assembly compliant with AS1252:2016 — the Australian standard for structural steel connections. K0 sets ship preassembled with the matching Class 8.8 hot-dip galvanised hex bolt, structural hex nut, and the required structural washers. K0 bolts must be tightened to the specified preload to develop the friction grip the connection design relies on.

What is the difference between Class 4.6 and Class 8.8 bolts?

Class 4.6 is a standard low-carbon mild steel bolt used for non-structural, low-load applications like timber fixing, brackets and general assembly. Class 8.8 is a medium-carbon alloy steel that has been quenched and tempered to roughly double the tensile strength of Class 4.6, making it the standard choice for load-bearing structural connections, automotive engineering and heavy machinery. The two grades are visually similar but mechanically very different — always check the marking on the bolt head to confirm which grade you have.

What spanner size do I need for a metric hex bolt?

Each metric bolt size has a standard Across Flats (AF) spanner size measured across the hex head: M5 = 8mm, M6 = 10mm, M8 = 13mm, M10 = 17mm, M12 = 19mm, M16 = 24mm, M20 = 30mm, M24 = 36mm, M30 = 46mm. Some manufacturers also produce AS1110 reduced-head bolts which step down one spanner size for the same thread. For imperial sizes, AF is measured in inches (e.g. a 1/2" UNC bolt typically takes a 3/4" AF spanner). Each product page on our site lists the AF measurement so you always pick the correct spanner or socket.

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 bolt.

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    Coach Screws
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    Cup Head Coach Bolts
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    Eye Bolts
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    Furniture Connector JCB Bolts
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    Hex Bolts & Set Screws
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    Hex Flange Bolts
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    Left Hand Thread Hex Bolts & Set Screws
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    Mushroom Head Roofing Bolts
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    Plow Bolts
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    Purlin Flanged Bolts
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    Structural K0 Bolts & Nuts
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    M2.5 x 0.45p Metric Coarse Stainless A2-70 G304 Hex Set Screw / Hex Bolts DIN 933
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    M3 x 0.50p Metric Coarse Stainless A2-70 G304 Hex Set Screw / Hex Bolts DIN 933
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    M3 x 0.50p Metric Coarse Stainless A4-70 G316 Hex Set Screw / Hex Bolts DIN 933
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    M3 x 0.50p Metric Coarse Nylon Hex Set Screw / Hex Bolts DIN 933
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    M4 x 0.70p Metric Coarse Stainless A2-70 G304 Hex Set Screw / Hex Bolts DIN 933
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    M5 x 0.80p Metric Coarse Stainless A2-70 G304 Hex Set Screw / Hex Bolts DIN 933
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    M5 x 0.80p Metric Coarse Stainless A4-70 G316 Hex Set Screw / Hex Bolts DIN 933
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    M5 x 0.80p Metric Coarse Zinc Hex Set Screw / Hex Bolts Class 8.8 High Tensile AS 1110.1
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    M5 x 0.80p Metric Coarse Brass Hex Set Screw / Hex Bolts DIN 933
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    M5 x 0.80p Metric Coarse Stainless A4-70 G316 (8mm AF) Hex Flange Serrated Bolts DIN 6921
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    M5 x 0.80p Metric Coarse Zinc Mushroom Phillips / Slot Roofing Gutter Bolts & Nuts AS 1427
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    M6 x 1.00p Metric Coarse Stainless A2-70 G304 Hex Bolts DIN 931
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    M6 x 1.00p Metric Coarse Stainless A2-70 G304 Hex Set Screw / Hex Bolts DIN 933
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    M6 x 1.00p Metric Coarse Bumax 88 Stainless A4-80 G316 Hex Bolts High Tensile ISO 4017
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    M6 x 1.00p Metric Coarse Bumax 88 Stainless A4-80 G316 Hex Set Screw / Hex Bolts High Tensile ISO 4017
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    M6 x 1.00p Metric Coarse Zinc Hex Set Screw / Hex Bolts Class 8.8 High Tensile AS 1110.1
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    M6 x 1.00p Metric Coarse Zinc Hex Bolts Class 8.8 High Tensile AS 1110.1
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    M6 x 1.00p Metric Coarse Zinc Hex Bolts Class 10.9 High Tensile AS 1110.1
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    M6 x 1.00p Metric Coarse Zinc Hex Set Screw / Hex Bolts Class 10.9 High Tensile AS 1110.1
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    M6 x 1.00p Metric Coarse Galvanised Hex Set Screw / Hex Bolts Class 8.8 High Tensile AS 1110.2
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    M6 x 1.00p Metric Coarse Brass Hex Set Screw / Hex Bolts DIN 933
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    M6 x 1.00p Metric Coarse Nylon Hex Set Screw / Hex Bolts DIN 933
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Find the right bolts for your project at Bolt & Nut Australia. We stock 3,700+ industrial bolts online — hex, flange, cup head coach, K0 structural, coach screws, plow and purlin. Available in galvanised, stainless A2-70 G304 and A4-70 G316 marine, zinc silver, zinc yellow and brass. Order online for same-day Brisbane dispatch and free delivery Australia-wide.

TECHNICAL RESOURCES

Every bolt subcategory has its own CAD drawings and spec PDFs linked at the bottom of its page. For the full library covering bolts and every other product range we stock, see our Technical PDF's Library.

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System of Measurement
  1. Metric 231 items
  2. Imperial 81 items
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  1. M2.5 (2.5mm) 1 item
  2. M3 (3mm) 5 items
  3. M4 (4mm) 6 items
  4. M5 (5mm) 15 items
  5. M6 (6mm) 35 items
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  11. M16 (16mm) 25 items
  12. M18 (18mm) 7 items
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  14. M24 (24mm) 11 items
  15. 3/16" (#10-24) 4 items
  16. #10-32 (3/16") 1 item
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  26. 1" 2 items
  27. 1-1/8" 1 item
  28. 1-1/4" 2 items
  29. 1-3/8" 1 item
Size & Thread Pitch
  1. M2.5 x 0.45p Coarse 1 item
  2. M3 x 0.50p Coarse 5 items
  3. M4 x 0.70p Coarse 6 items
  4. M5 x 0.80p Coarse 15 items
  5. M6 x 1.00p Coarse 33 items
  6. M7 x 1.00p Coarse 1 item
  7. M8 x 1.00p Fine 2 items
  8. M8 x 1.25p Coarse 28 items
  9. M10 x 1.25p Fine 3 items
  10. M10 x 1.50p Coarse 27 items
  11. M12 x 1.25p Extra Fine 3 items
  12. M12 x 1.50p Fine 2 items
  13. M12 x 1.75p Coarse 27 items
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  15. M14 x 2.00p Coarse 8 items
  16. M16 x 1.50p Fine 2 items
  17. M16 x 2.00p Coarse 22 items
  18. M18 x 1.50p Fine 2 items
  19. M18 x 2.50p Coarse 5 items
  20. M20 x 1.50p Fine 2 items
  21. M20 x 2.50p Coarse 13 items
  22. M24 x 1.50p Extra Fine 2 items
  23. M24 x 2.00p Fine 2 items
  24. M24 x 3.00p Coarse 7 items
  25. 3/16" (#10-24) x 24 TPI BSW 4 items
  26. #10-32 (3/16") x 32 TPI UNF 1 item
  27. 1/4" x 20 TPI UNC 8 items
  28. 1/4" x 20 TPI BSW 2 items
  29. 1/4" x 26 TPI BSF 1 item
  30. 1/4" x 28 TPI UNF 3 items
  31. 5/16" x 18 TPI BSW 1 item
  32. 5/16" x 18 TPI UNC 8 items
  33. 5/16" x 22 TPI BSF 1 item
  34. 5/16" x 24 TPI UNF 3 items
  35. 3/8" x 16 TPI UNC 8 items
  36. 3/8" x 20 TPI BSF 1 item
  37. 3/8" x 24 TPI UNF 3 items
  38. 7/16" x 14 TPI UNC 6 items
  39. 7/16" x 18 TPI BSF 1 item
  40. 7/16" x 20 TPI UNF 1 item
  41. 1/2" x 12 TPI BSW 2 items
  42. 1/2" x 13 TPI UNC 7 items
  43. 1/2" x 16 TPI BSF 1 item
  44. 1/2" x 20 TPI UNF 3 items
  45. 9/16" x 12 TPI UNC 1 item
  46. 9/16" x 18 TPI UNF 1 item
  47. 5/8" x 11 TPI UNC 2 items
  48. 5/8" x 18 TPI UNF 1 item
  49. 3/4" x 10 TPI UNC 2 items
  50. 3/4" x 16 TPI UNF 1 item
  51. 7/8" x 9 TPI UNC 2 items
  52. 1" x 8 TPI UNC 2 items
  53. 1-1/8" x 7 TPI UNC 1 item
  54. 1-1/4" x 7 TPI UNC 2 items
  55. 1-3/8" x 6 TPI UNC 1 item
Thread Type
  1. Metric - Coarse 203 items
  2. Metric Coarse - Left Hand Thread 6 items
  3. Metric - Fine 22 items
  4. UNC / BSW - Coarse 54 items
  5. BSW - Coarse 5 items
  6. UNF - Fine 17 items
  7. BSF - Fine 5 items
Length
  1. 4mm 1 item
  2. 5mm 1 item
  3. 6mm 9 items
  4. 8mm 12 items
  5. 10mm 32 items
  6. 12mm 46 items
  7. 13mm 1 item
  8. 15mm 1 item
  9. 16mm 71 items
  10. 18mm 2 items
  11. 20mm 102 items
  12. 21mm 1 item
  13. 25mm 126 items
  14. 26mm 1 item
  15. 29mm 1 item
  16. 30mm 141 items
  17. 35mm 95 items
  18. 39mm 1 item
  19. 40mm 158 items
  20. 45mm 92 items
  21. 50mm 157 items
  22. 55mm 54 items
  23. 60mm 114 items
  24. 65mm 87 items
  25. 70mm 96 items
  26. 75mm 97 items
  27. 80mm 91 items
  28. 85mm 11 items
  29. 90mm 88 items
  30. 100mm 117 items
  31. 110mm 59 items
  32. 120mm 83 items
  33. 130mm 73 items
  34. 140mm 58 items
  35. 150mm 77 items
  36. 160mm 30 items
  37. 170mm 21 items
  38. 180mm 35 items
  39. 190mm 13 items
  40. 200mm 36 items
  41. 210mm 4 items
  42. 220mm 21 items
  43. 230mm 2 items
  44. 240mm 16 items
  45. 250mm 10 items
  46. 260mm 15 items
  47. 270mm 3 items
  48. 280mm 15 items
  49. 290mm 3 items
  50. 300mm 16 items
  51. 325mm 5 items
  52. 350mm 6 items
  53. 375mm 5 items
  54. 400mm 6 items
  55. 450mm 1 item
  56. 500mm 1 item
  57. 550mm 1 item
  58. 600mm 1 item
  59. 1/4" 2 items
  60. 3/8" 4 items
  61. 1/2" 32 items
  62. 5/8" 23 items
  63. 3/4" 48 items
  64. 1" 66 items
  65. 1-1/4" 67 items
  66. 1-1/2" 66 items
  67. 1-3/4" 29 items
  68. 2" 63 items
  69. 2-1/4" 6 items
  70. 2-1/2" 55 items
  71. 2-3/4" 4 items
  72. 3" 56 items
  73. 3-1/4" 3 items
  74. 3-1/2" 36 items
  75. 3-3/4" 3 items
  76. 3-7/8" 1 item
  77. 4" 48 items
  78. 4-1/8" 1 item
  79. 4-1/4" 1 item
  80. 4-1/2" 32 items
  81. 5" 36 items
  82. 5-1/2" 19 items
  83. 6" 30 items
  84. 6-1/2" 1 item
  85. 7" 9 items
  86. 8" 10 items
  87. 9" 6 items
  88. 10" 6 items
  89. 11" 1 item
  90. 12" 1 item
Material / Finish
  1. Brass 5 items
  2. Galvanised 30 items
  3. Nickel Plated 2 items
  4. Nylon 8 items
  5. Plain Black Uncoated 13 items
  6. Stainless Steel 135 items
  7. Zinc Silver Plated 106 items
  8. Zinc Yellow Plated 13 items
Class / Grade
  1. A2-70 G304 75 items
  2. A4-70 G316 58 items
  3. High Tensile A4-80 G316 2 items
  4. Low Tensile Grade 2 3 items
  5. Low Tensile Class 4.6 45 items
  6. High Tensile Grade 5 9 items
  7. High Tensile Grade 8 21 items
  8. High Tensile Class 8.8 70 items
  9. High Tensile Grade 9 6 items
  10. High Tensile Class 10.9 17 items
  11. High Tensile Class 12.9 6 items
Corrosion Protection Level
  1. Ultimate 65 items
  2. Excellent 118 items
  3. Very Good 2 items
  4. Moderate 114 items
  5. Low 13 items
Part or Full Thread
  1. Full Thread (FT) 172 items
  2. Part Thread (PT) 93 items
Head Type
  1. Countersunk Head 2 items
  2. Cup Head 15 items
  3. Eye 27 items
  4. Flat Head 3 items
  5. Hex Flange Head 43 items
  6. Hex Head 201 items
  7. Mushroom Head 9 items
  8. Pan Head 6 items
  9. Raised Head 6 items
Spanner Size
  1. 5mm 1 item
  2. 5.5mm 3 items
  3. 7mm 4 items
  4. 5/16" 3 items
  5. 8mm 12 items
  6. 3/8" 2 items
  7. 10mm 21 items
  8. 11mm 1 item
  9. 7/16" 9 items
  10. 12mm 2 items
  11. 1/2" 10 items
  12. 13mm 21 items
  13. 17/32" 1 item
  14. 14mm 2 items
  15. 9/16" 10 items
  16. 15mm 5 items
  17. 19/32" 1 item
  18. 5/8" 7 items
  19. 16mm 10 items
  20. 17mm 10 items
  21. 45/64" 1 item
  22. 18mm 15 items
  23. 19mm 9 items
  24. 3/4" 9 items
  25. 13/16" 5 items
  26. 21mm 8 items
  27. 22mm 4 items
  28. 15/16" 2 items
  29. 24mm 19 items
  30. 27mm 10 items
  31. 1-1/8" 2 items
  32. 30mm 10 items
  33. 32mm 1 item
  34. 1-5/16" 1 item
  35. 36mm 9 items
  36. 1-1/2" 1 item
  37. 41mm 1 item
  38. 1-11/16" 1 item
  39. 1-7/8" 1 item
Drive Type
  1. Hex 246 items
  2. Hex / Phillips 4 items
  3. Internal Hex 3 items
  4. Phillips 8 items
  5. Phillips / Slot 5 items
  6. Torx 2 items
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