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M6 (6mm) Galvanised Hex Coach Screws Low Tensile Class 4.6 AS 1393
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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
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| System of Measurement | Metric |
|---|---|
| Product | Hex Coach Screw |
| Head Type | Hex Head |
| Size | M6 (6mm) |
| Thread Pitch | 2.50mm |
| Thread | Coarse |
| Thread Direction | Right Hand |
| Corrosion Protection Level | Excellent |
| Class Grade | Low Tensile Class 4.6 |
| Material | Carbon Steel |
| Finish | Galvanised |
| Length (l) | Select from the dropdown |
| Thread Length (t) | Thread length will be at least 60% or more for the length of screw* see below for more info |
| Product Diameter (d) | 5.52 - 6.48mm |
| Across Flats (af) | 9.64 - 10.00mm |
| Across Corners (ac) | 10.89 - 11.50mm |
| Head Height (h) | 3.63 - 4.38mm |
| Spanner Size (af) | 10mm |
| Drive Type | Hex |
| Closest size in imperial | 1/4" |
| Standard Made To | AS1393 |
| Brand | Hobson Engineering |
| Alternative Brands | Bremick Fasteners | Brighton Best |
Dimensional data is a guide only. Tolerance differences exist between brands and batches
About Hex Coach Screws
Hex Coach Screws are heavy-duty timber fasteners with a hex head and a coarse single-start wood thread. The hex head is driven with a spanner or socket and the broad flat under-head bears against the timber face, preventing the screw from pulling through. Commonly used to fix timber to timber, timber to steel, or to anchor structural fittings into hardwood or treated pine. Typical applications include deck framing, ledger plates, post brackets, retaining walls and outdoor furniture.
Recommended use The standard outdoor finish for timber framing, fencing, decking, retaining walls and treated-timber contact (H3 and H4 treated pine). Decades of corrosion protection in most outdoor and rural environments.
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
Common in deck framing, ledger plates, post brackets, retaining walls and outdoor furniture. Drive with a spanner or socket on the hex head; no clearance hole is needed in the second timber piece.
Coach screws have a coarse single-start wood thread and a pointed tip. Hex bolts have a machine thread and a flat end designed to mate with a nut.
All coach screws require a pilot hole before they are driven into the wood, regardless of timber type. The pilot hole prevents the screw from splitting the timber and reduces driving torque.
Hot-dip galvanising is the standard finish for outdoor timber work, including direct contact with H3 and H4 treated pine. The thick (50 to 85 micron) zinc layer gives decades of corrosion protection in most rural and outdoor environments.
The standard defines the head dimensions, thread form, mechanical properties and material grade.
Drive these with a matching spanner, socket or driver bit. Using an oversized tool will round off the head.
Treated pine contains copper-based preservatives that attack zinc plating and uncoated carbon steel. Hot-dip galvanised has a thick sacrificial zinc layer that holds up against these preservatives. Never use plain or electroplated-zinc fasteners in treated-timber contact.
Material & Coating
Galvanised Hot-dip galvanised carbon steel. The standard outdoor finish; thick zinc coating gives decades of corrosion resistance. The right choice for trailer chassis, mast and pole mounting, structural pipe clamping and outdoor tank fittings.
Matching Finishes Always match the finish across the assembly. Hot-dip galvanising adds a much thicker coating than zinc plating, so a zinc-plated nut will not wind onto a galvanised bolt, and a galvanised nut on a zinc-plated bolt will be loose. Pair galvanised bolts with galvanised nuts and washers.
Important Performance in permanent coastal applications (within 300 metres of the sea) is reduced. Refer to AGA technical bulletins or contact us for the right grade for severe marine exposure.
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 1.00mm coarse pitch, meaning the peaks are 1.00mm 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 coach screw 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.
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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 | BH46GLM060025, KMK606025G, SCSMG060252, 629010, 34G06025R, BH46GLM060030, KMK606030G, SCSMG060302, 629015, 34G06030R, BH46GLM060040, KMK606040G, SCSMG060402, 629020, 34G06040R, BH46GLM060050, KMK606050G, SCSMG060502, 629025, 34G06050R, BH46GLM060065, KMK606065G, SCSMG060652, 629030, 34G06065R, BH46GLM060075, KMK606075G, SCSMG060752, 629035, 34G06075R, SCSMG061002, 629040, 34G06100R |
| UPC | 9314818673549, 9337357034817, 662403164095, 9312862101773, 9314818430623, 9337357009402, 662403164118, 9314818673556, 9337357034824, 662403164132, 9312862101780, 9314818673563, 9337357034831, 662403164156, 9312862101797, 9314818673570, 662403164170, 9312862101803, 9314818673587, 9337357034855, 662403164194, 9312862101810, 9337357034862, 662403164217, 9312862101834 |
