Header imageFREE Delivery Header imageAustralian OwnedHeader imageSpend DISCOUNTS

Toggle Nav
Cart 0

SPEND DISCOUNT Up to $99 = 5%, between $100 and $249 =10% and over $250 = 15%

Products

To view our complete range Icon All Categories Quick Order
Abrasives View all
Abrasives
Allthread View all
Allthread
Assortment Kits View all
Assortment Kits
Bolts View all
Bolts
Drilling View all
Drilling
Driving View all
Driving
Furniture Fasteners View all
Furniture Fasteners
Machine Screws View all
Machine Screws
Marine & Hardware View all
Marine & Hardware
Masonry Fixings View all
Masonry Fixings
Nuts View all
Nuts
Nutserts | Rivet Nuts View all
Nutserts | Rivet Nuts
Pins & Clips View all
Pins & Clips
Rivets View all
Rivets
Screws for Decking View all
Screws for Decking
Screws for Metal View all
Screws for Metal
Screws for Timber View all
Screws for Timber
Security Fasteners View all
Security Fasteners
Self Tapping Screws View all
Self Tapping Screws
Silicones & Adhesives View all
Silicones & Adhesives
Socket Allen Screws View all
Socket Allen Screws
Taps & Dies View all
Taps & Dies
Tools View all
Tools
U Bolts View all
U Bolts
Washers View all
Washers
FREE Delivery Click & Collect – Murarrie, Brisbane Same-day dispatch before 1pm Australian owned and operated 25,000+ lines ex-stock
Technical Resources
Menu
Account

Jobber Drill Bits

Jobber Drill Bits

Jobber Drill Bits (also known as HSS Jobber Bit, Twist Drill Bit, Cobalt Jobber Bit or General-Purpose Drill Bit) are the everyday workhorse twist drill for metal, alloy and timber. BNA stocks 217+ of these ex stock from our Brisbane warehouse, covering the full range of diameters, lengths and shank styles that engineers, tradies, manufacturers and DIY users need for everyday drilling tasks. Same-day dispatch on online orders placed before 1pm.

Also known as: HSS Jobber Bit, Twist Drill Bit, Cobalt Jobber Bit, General-Purpose Drill Bit.

Drill Bit Construction & Materials

Alpha Gold Series HSS M2 (1.3343) high-speed steel, 800-900 HV hardness, the standard for general steel, brass, aluminium, alloy and timber. Self-coloured finish, 135-degree split point. Holds up to operating temperatures around 600 degrees C.

Alpha HSS Cobalt M35 5% cobalt added to the steel matrix. Operating temperature lifts to ~700 degrees C, so the cutting edge survives stainless and hardened workpieces where standard HSS would anneal in minutes. Darker tempered colour. Costs more, lasts much longer in stainless.

Alpha Inox Stainless Specific Optimised geometry and edge prep for stainless and exotic alloys. Identifiable by the Alpha Inox marking on the shank. The default choice for production runs in 304, 316, duplex and Inconel.

Drive & Use

Standard twist drill geometry: 135-degree split point self-centres on a flat surface without a punch-mark, helical flutes clear chips through any panel thickness up to roughly the flute depth.

Bench drills, cordless drivers, impact drivers and drill presses all accept these. Match the chuck to the shank diameter and tighten on the shank (not the flute) for full grip.

For metal drilling, run slower for bigger bits: 1mm-3mm at 2000-3000 RPM, 4mm-8mm at 1000-2000 RPM, 10mm-13mm at 500-1000 RPM, over 13mm under 500 RPM. Cutting fluid keeps the edge cool in steel and stainless. Aluminium drills clean with WD-40 or dry. Cast iron drills dry. Stainless requires fluid.

Pilot hole sizing: drill a 25-50% pilot before any hole over 8mm. A 13mm hole starts with a 6mm pilot. Without one, the chisel edge grinds rather than cuts, the bit walks, and the tip burns.

Sizing & Measurements

Diameter range 1mm-25mm metric, 1/64" - 1/2" imperial, plus number (#1-#80) and letter (A-Z) sizes

Length range Standard jobber length: 24mm to 290mm overall depending on diameter. Flute length is approximately 9x the diameter, which is the international jobber convention.

Shank Plain round shank that fits any standard drill chuck. 13mm shanks for the larger sizes mean the same chuck handles the whole range.

Metric sizes step in 0.5mm increments through 13mm, then 0.5mm or 1mm to 25mm. Imperial sizes step in 1/64-inch through 1/2 inch, then 1/32 or 1/16-inch above. Number and letter drill sizes fill the gaps between metric and imperial in 0.05mm intervals.

For a metric bolt clearance hole, drill the bolt diameter plus 0.5mm-1mm (so M10 = 10.5mm-11mm drill). For a tapped hole, drill the standard tapping size for the thread (M10 coarse = 8.5mm).

Jobber LENGTH refers to the standard 9-times-diameter flute length. For deeper holes, step up to the Long Series range. For shorter, more rigid drilling, screw machine length bits (not currently stocked) are the next category down.

WHY AUSTRALIA TRUSTS BOLT & NUT

With 15+ years selling fasteners and drilling tools 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 drill bit, holesaw or set for the job.

View as Grid List

Items 1-40 of 217

Set Descending Direction
Page
per page

217+ jobber drill bits ex stock Brisbane: the everyday workhorse twist drill for metal, alloy and timber. Same-day dispatch on orders before 1pm.

TECHNICAL RESOURCES

CAD drawings showing how to identify and measure each variant: Cobalt Jobber Bit · Inox Stainless Jobber Bit.

For the full library of dimensioned PDFs and CAD references, see our Technical PDF's Library.

Filter by :
Filter By
Category
System of Measurement
  1. Metric 156 items
  2. Imperial 61 items
Size
  1. M1 (1mm) 4 items
  2. M1.5 (1.5mm) 4 items
  3. M1.6 (1.6mm) 1 item
  4. M2 (2mm) 4 items
  5. M2.5 (2.5mm) 4 items
  6. M2.6 (2.6mm) 1 item
  7. M2.7 (2.7mm) 1 item
  8. M2.8 (2.8mm) 1 item
  9. M2.9 (2.9mm) 1 item
  10. M3 (3mm) 4 items
  11. M3.2 (3.2mm) 1 item
  12. M3.3 (3.3mm) 3 items
  13. M3.5 (3.5mm) 4 items
  14. M3.7 (3.7mm) 1 item
  15. M3.9 (3.9mm) 1 item
  16. M4 (4mm) 4 items
  17. M4.1 (4.1mm) 1 item
  18. M4.2 (4.2mm) 3 items
  19. M4.3 (4.3mm) 1 item
  20. M4.5 (4.5mm) 4 items
  21. M4.7 (4.7mm) 1 item
  22. M4.8 (4.8mm) 1 item
  23. M5 (5mm) 4 items
  24. M5.1 (5.1mm) 1 item
  25. M5.3 (5.3mm) 1 item
  26. M5.5 (5.5mm) 4 items
  27. M5.6 (5.6mm) 1 item
  28. M5.8 (5.8mm) 1 item
  29. M6 (6mm) 4 items
  30. M6.1 (6.1mm) 1 item
  31. M6.4 (6.4mm) 1 item
  32. M6.5 (6.5mm) 4 items
  33. M6.6 (6.6mm) 1 item
  34. M6.8 (6.8mm) 2 items
  35. M6.9 (6.9mm) 1 item
  36. M7 (7mm) 4 items
  37. M7.1 (7.1mm) 1 item
  38. M7.2 (7.2mm) 1 item
  39. M7.5 (7.5mm) 4 items
  40. M7.8 (7.8mm) 1 item
  41. M7.9 (7.9mm) 1 item
  42. M8 (8mm) 4 items
  43. M8.3 (8.3mm) 1 item
  44. M8.4 (8.4mm) 1 item
  45. M8.5 (8.5mm) 4 items
  46. M8.7 (8.7mm) 1 item
  47. M8.8 (8.8mm) 1 item
  48. M9 (9mm) 4 items
  49. M9.1 (9.1mm) 1 item
  50. M9.3 (9.3mm) 1 item
  51. M9.4 (9.4mm) 1 item
  52. M9.5 (9.5mm) 4 items
  53. M9.6 (9.6mm) 1 item
  54. M9.7 (9.7mm) 1 item
  55. M9.9 (9.9mm) 1 item
  56. M10 (10mm) 4 items
  57. M10.1 (10.1mm) 1 item
  58. M10.2 (10.2mm) 2 items
  59. M10.3 (10.3mm) 1 item
  60. M10.5 (10.5mm) 4 items
  61. M10.6 (10.6mm) 1 item
  62. M10.8 (10.8mm) 1 item
  63. M11 (11mm) 4 items
  64. M11.1 (11.1mm) 1 item
  65. M11.2 (11.2mm) 1 item
  66. M11.5 (11.5mm) 4 items
  67. M11.8 (11.8mm) 1 item
  68. M12 (12mm) 4 items
  69. M12.1 (12.1mm) 1 item
  70. M12.2 (12.2mm) 1 item
  71. M12.5 (12.5mm) 4 items
  72. M12.7 (12.7mm) 1 item
  73. M12.8 (12.8mm) 1 item
  74. M12.9 (12.9mm) 1 item
  75. M13 (13mm) 4 items
  76. 1/32" 1 item
  77. 1/64" 1 item
  78. 3/64" 1 item
  79. 1/16" 2 items
  80. 5/64" 2 items
  81. 3/32" 2 items
  82. 7/64" 2 items
  83. 1/8" 2 items
  84. 9/64" 2 items
  85. 5/32" 2 items
  86. 11/64" 2 items
  87. 3/16" 2 items
  88. 13/64" 2 items
  89. 7/32" 2 items
  90. 15/64" 2 items
  91. 1/4" 2 items
  92. 17/64" 2 items
  93. 9/32" 2 items
  94. 19/64" 2 items
  95. 5/16" 2 items
  96. 21/64" 2 items
  97. 11/32" 2 items
  98. 23/64" 2 items
  99. 3/8" 2 items
  100. 25/64" 2 items
  101. 13/32" 2 items
  102. 27/64" 2 items
  103. 7/16" 2 items
  104. 29/64" 2 items
  105. 15/32" 2 items
  106. 31/64" 2 items
  107. 1/2" 2 items
Drill Bit Type
  1. Cobalt 56 items
  2. High Speed Steel 105 items
  3. Inox Stainless 27 items
  4. Stainless Plus 29 items
Brand
  1. Alpha 190 items
  2. Sutton Tools 27 items
  • card
  • card
  • card
  • card
  • card
  • card
  • card
  • card

YOU'RE ON A SECURE SITE

Copyright © 2026 Bolt & Nut Australia Pty LTD, ABN 45 159 328 604

Magento Website built By dZine-Hub

scroll icon