FREE Delivery
Australian Owned
Spend DISCOUNTS
All Categories
M5 x 0.80p Metric Coarse Zinc (8mm AF) Hex Flange Serrated Bolts Class 8.8 High Tensile DIN 6921
Select a length below to view price
Remaining Qty:
In Stock
Sold Out
Other Sizes in Range
Delivery Information
Orders under $30 (Bulky items sent as parcel for FREE)
- Aust Post UNTRACKED Letter – FREE
- Parcel – From $8
- Express – From $10
- Click and Collect – 2hrs
Orders over $30
- Parcel – FREE
- Express – From $10
- Click and Collect – 2hrs
5% Off
10% Off
15% Off
| System of Measurement | Metric |
|---|---|
| Product | Hex Flange Bolt |
| Head Type | Hex Flange Head |
| Size | M5 (5mm) |
| Size & Thread Pitch | M5 x 0.80p Coarse |
| Thread Pitch | 0.80mm |
| Thread | Coarse |
| Thread Direction | Right Hand |
| Corrosion Protection Level | Moderate |
| Class Grade | High Tensile Class 8.8 |
| Material | Carbon Steel |
| Finish | Zinc Plated |
| Length (l) | Select from the dropdown |
| Thread Length (t) | Choose your length to view |
| Product Diameter (d) | 4.82 - 5.00mm |
| Across Flats (af) | 7.78 - 8.00mm |
| Across Corners (ac) | 9.10mm |
| Flange Diameter (f) | 11.10 - 12.00mm |
| Head Height (h) | 4.90 - 5.30mm |
| Wrench Height | 3.40mm |
| Serrations under Head | Yes |
| Spanner Size (af) | 8mm |
| Drive Type | Hex |
| Closest size in imperial | 3/16" |
| Standard Made To | DIN6921 |
| Brand | Hobson Engineering |
Dimensional data is a guide only. Tolerance differences exist between brands and batches
About Hex Flange Bolts
Hex Flange Bolts have a six-sided head with an integrated washer face (the flange) on the underside. The flange spreads load and removes the need for a separate washer. Serrated variants have small teeth on the underside of the flange that bite into the mating surface and resist loosening from vibration. Common in automotive, machinery, structural steel and any high-vibration metal-to-metal application.
Recommended use Indoor and dry-environment use only. Common in automotive, machinery and electrical assembly where the bolt is not exposed to weather, condensation or wet service.
Compare your fastener to our visual size guide to confirm M-size, pitch and length.
Match your spanner / socket AF (across-flats) to the bolt size it fits. Our reference chart covers every metric and imperial size we stock.
Frequently Asked Questions
Fewer parts to handle on the production line, no risk of leaving the washer off, and consistent bearing area every assembly.
Serrated flange bolts give vibration resistance without a spring washer or Nyloc nut. Avoid on soft or coated surfaces where the teeth would damage the finish.
See the head marking chart and full strength table on our site for the full conversion table and head markings.
DIN 6921 is the European standard, JIS B1189 the Japanese, IFI 111 the imperial. Head dimensions differ slightly between standards; check the AF before ordering.
Drive these with a matching spanner, socket or driver bit. Using an oversized tool will round off the head.
If a flange nut is not used, a hex nut with a flat washer is acceptable.
Common across truck, agricultural and earthmoving equipment. The serrated variant is favoured in production environments because it removes the need for a separate locking element.
Material & Coating
Zinc Electroplated zinc on carbon steel. A thin (5 to 12 micron) bright (clear-passivated) zinc layer applied by electrolysis. Bright silvery finish.
Important NOT suitable for outdoor, wet, marine or treated-timber applications. The thin coating is consumed quickly by rainwater or treated-pine preservatives. For outdoor use, specify hot-dip galvanised.
Class Metric fasteners are classified as class 2, 4.6, 8.8, 10.9, 12.9, 14.9. See the head marking chart and full strength table.
Thread Pitch & Terminology
Thread Pitch (Metric) Metric fasteners measure thread pitch as the distance between thread peaks, expressed in millimetres. Metric also branches into three series: coarse (the default; widest tolerance, easiest to tap), fine (a tighter pitch for higher clamp load or thinner walls), and extra fine (the tightest pitch, used for thin-wall tube, precision instruments, and aerospace fittings where vibration loosening must be minimised). Always match the series as well as the size - a metric fine nut will not engage a metric coarse bolt of the same diameter, and an extra fine nut will not engage either. This product has a 0.80mm coarse pitch, meaning the peaks are 0.80mm apart.
How to Measure
Fastener Length This product has a head that sits on top of the material, so the length is measured from directly under the head to the tip of the thread. The head itself is not included in the size.
Thread Length On a bolt the thread length runs from the start of the unthreaded section (called the shank) to the end of the thread. To view the thread length for this product, select a length above.
Resources
For full technical data including key product information, range and a CAD drawing, see our Technical PDFs library.
Convert between metric and imperial sizes, gauge to mm, decimal to fraction and TPI to pitch with our measurement conversion calculators.
Pricing & Delivery
Includes GST, a Tax Invoice and Free Standard Delivery anywhere in Australia.
Buy with Confidence
15+ years selling online · 25,000+ stock lines · 200 million pieces ex-stock in Brisbane QLD.
Excellent on REVIEWS.ioTrusted by DIYers, tradespeople, builders, manufacturers, government, councils and engineers across Australia · Read reviewsDisclaimer
Technical data Researched and compiled from numerous industry sources for the sole purpose of providing basic information. All material is advisory only and its use by anyone is entirely voluntary. Reliance on it for any purpose by anyone is at the sole risk of that person, and Bolt and Nut Australia is not responsible for any loss, claim or damages arising therefrom. In developing this information, Bolt and Nut Australia has made a determined effort to present it accurately.
Measurements Sizes are taken from supplier catalogues or hand-measured and should be used as a guide. Minor variation between batches is normal. Stock is sourced from various suppliers, so differences may exist between batches in thread length, markings, appearance or finish.
Product Photos & PDF Data Sheets Represent the product type, not exact size. PDFs are a reference guide only. Specifications may change without notice.
If you see any problems with any of our specifications or you require additional information please contact us.
Delivery
Weigh less than 500grams
Exceptions: Tools, Kits, Bulky items = Sent as a parcel with tracking
Small orders that fit into the slot of your Letterbox are sent:
FREE with Aust Post Letter delivery with NO TRACKING and delivery between 4-12 business days
Or
Select a Quicker delivery service
- $7.00 Parcel Delivery 2-7 business days
- From $12.00 Express Delivery 1-4 business days
- From $14.00 StarTrack PREMIUM Express Delivery 1-3 business days
Or
Click & Collect - Warehouse pickup
Unit 9, 93 Rivergate Place, Murarrie, QLDPlace your order online and we will have it ready within 2 hours. Call if required sooner
Pickup times between 8am - 4pm, Monday - Friday
Weigh more than 500grams
Included is orders under $30 but weigh more than 500grams or wont fit in the slot of your letterbox
Including Large and Bulky heavy orders are sent:
FREE as a Parcel Delivery WITH TRACKING and delivery between 2-7 business days
Or
Select an Express delivery service
- From $12.00 Express Delivery 1-4 business days
- From $14.00 StarTrack PREMIUM Express Delivery 1-3 business days
Or
Click & Collect - Warehouse pickup
Unit 9, 93 Rivergate Place, Murarrie, QLDPlace your order online and we will have it ready within 2 hours. Call if required sooner
Pickup times between 8am - 4pm, Monday - Friday
Further delivery information can be found on our Delivery page
Supplier Details
| MPN | BF88ZCM050010, BF88ZCM050012, BF88ZCM050016, BF88ZCM050025 |
| UPC | 9350629062912, 9350629062929, 9350629062936, 9350629062943 |
