We are often asked by customers how to tell the width and thickness (distance accross the flat) of the bolt heads prior to purchase from our website.
Below is a chart with the dimensions of our stocked high tensile bolts, In accordance with Australian standards.
Metric high tensile, precision hexagon head bolts, screws and hexagon nuts. ISO metric course pitch series threads 6g. Property class 8.8 to Australian standards, bolts and screws AS1110-2000 nuts AS 1112-200
When a bolt is tightened, the nut moves along the bolt thread and its face is pressed against the item to be fastened.
This force at the bearing surface leads to the bolt being loaded in TENSION and the nut in COMPRESSION.
Hence the bolt stretches axially, causing an INCREASE in pitch of the male thread and the nut COMPRESSES – resulting in a REDUCTION in pitch of the female nut.
The consequence of these two actions is that the threads near the loaded nut face are forced into much harder contact than the remainder – resulting in a CONCENTRATION of load and higher stress in this region of the union.
Typically the resulting maximum stress is about THREE times the nominal stress on the initial threads – in some cases the nut can also “mushroom”.
As an approximation – the first thread carries 33% and the second carries 25% of the total load.
Studies have suggested that for the same length of thread engagement – the FINER the thread pitch the higher the average load on the first thread.
This is one of the contributing factors why high tensile fine pitch bolts metric fine and UNF threads have a higher susceptibility to stripping failures.
Sound engineering practice is to have at least two full threads protruding past the end of the nut.
References: Technical information supplied courtesy of Hobson update 26 - Nov 14
Bolts Nuts Screws ONLINE supplying: (High Tensile bolts (Nata Cretified) Metric/UNF/UNC/IMPERIAL, Cup Head, Bolts, Screws, Nylocs, Washers, Chip board screws, 316 / 304 Stainless Fasteners, Socket Screws, Concrete fixings, galvenised fasteners, Batten Screws, Bugle Head Screws, Phillips Heads Screws, Hardware, Allen Head Screws)
Several major brand names now import removable concrete bolts and it would seem each have given the removable concrete bolt a new name (can’t help laughing at these guys J) see list below to help identify the brands.
Ramset call it the Ankascrew Screw-In Anchor
Powers Fasteners call it Blue Tip Screw Bolt (Some blue paint on the tip) supposedly to lubricate the thread (Gimmick)
Pro Fast call it a Pro Bolt
Bremick have a version named Masonry Screw Anchor (available 8.8 high tensile)
Hobson Use the name XBOLT Also has a dab of paint on the tip. (red)
Prodomaniatly used for decking or flooring when timber,decking,ply or modwood needs to be screwed directly to steel bearers joists or purlins.
Timber to Metal Wing Teks. Stainless Steel and or Galvanized.
Wing Teck Screws are specifically designed for fastening timber and composite boards to metal with no pre drilling or countersinking. The special wing feature prevents thread engagement with the timber enabling rapid fastening and stops the lifting of the timber before the screw has fully penetrated the base material.
As the drill point drills throught the timber the special wings enlarge the hole duiameter ensuring that there is a clearance between the threads and the timber.
Once the drilling point has fully penetrated the base material the special wings break off on contact with the base material. The threads on the screw shank then engage and cut mating threads into the base material.The fastener head is then recessed into the fastened material as the required clamping forces are generated.
These screws are Bi-Metal as they have a high tensile drill tip fused onto the stainless steel screw and then are class 3 coated (galv) to protect the tip. A reasonably fast screw driver 2000 rpm Minimum is recommended and will drill through about 3.2mm thick steel.
Decking Screws stainless steel, Most popular is the 10x50 square drive grade 304, great for 19 to 22mm decking boards. Also popular with people installing 19 mm decking boards is 8gauge x 50mm Trim Head decking screws these screws have a smaller drive system and less head than the 10 gauge. For thicker decking boards Batten Screws, 14 gauge batten screws are popular and recomended for fastening boards that are 30mm plus thick 50,75,100,125 and 150mm long they are a strong and robust available stainless steel or class 3 galvanized for those on a tight budget.
If you have steel joists you will need wing teks, self drilling and countersinking screws designed for fixing timber deck to metal joists.
If your deck is hardwood and your wanting a good finish you will need a clever tool, This is a pilot drill with a countersinking tool attached at the correct depth for your screw.
Galvanized or stainless steel cup head bolts ideal for use with your treated pine beares and post.
Rivets are a cheap and effective way of assembling and very easy if you prepare correctly. First you must know which rivet you want. At bolts Nuts Scews online we have the rivet diameter overall rivet length and the grip range noted in millimeters, Click here for details. Traditionally rivets are coded as follows
The 1st number represents the diameter. The diameter equals the number x 1/32" (inch). 3x1/32 = 3/32 4x1/32 = 1/8 .
Rivet diameters come in sizes 3, 4, 5, 6, 8.
The 2nd number is the maximum grip length. The grip length = the number x 1/16" eg 4x1/16 = 1/4, 5x1/16 = 5/16
Grip lengths are 1, 2, 3, 4, 5, 6, 8.10,12,14,16 Where there is no minium Grip length. You should select a grip length not greater than 150% of material thickness. eg. If you are riveting 2x 16g overlapped panels the material thickness is approx 1/8" therefore a grip length of 3/16" is suitable.
Hole diameters a critical for good joints. Never over size the hole for a rivet. Always drill the holes at 90 deg to the material surface.
Pitching the rivets and over lap distances are determined by the rivet diameter the hole centre should be greater than 3 x the diameter from the materials edge. On overlapped joints a zig zag pattern is preferred with the rivet pitch at appox 5 - 10 diameters apart.
Australia contunues to use an increasing amount of socket head cap screws. Safety,
reliability and lower failure rates are three reasons directly traceable to the superior performance of socket head cap screws compared to traditional high tensile hex head bolts and fasteners. This is due to socket head cap screws having superior strength and advanced design. The internal hex drive in a cap screw requires less space for tightening no additional space needed for a spanner, therfore socket head cap screws can be used in tighter spaces or holes can be drilled and tapped closer together creating a superior end result on your job.
The higher tensile strength of socket screws can be translated into savings.Using fewer fasteners and reducing risk of fatigue failure whilst achiving a much higher clamping force.
Due to the many critical areas where socket head cap screws are used failure could or can be catastrophic and potentialy life threatening, it is for this reason any socket products purchased from bolts nuts screws online are of the highest quality available.
Our range of socket products is very large in both stianless steel socket products and high tensile alloy and stainless steel. Head types consist of countersunk/flathead, button head, socket head and grub screw. All available for purchase directly from this website.
For Information on sizes available and pries please select from the links below.
This is a drill bit table chart to help with converting bits from metric to imperial or number series. All of the drill bits included in our web site are good quality cutting tools manufactured from high speed steel as a minimum. Our range starts at 0.3mm. Cobalt drill bits and imperial or inch drills are available on request. Apparently the twist drill bit was invented by Steven A Morse back in 1861.
Phillips head screws apparently first invented by Mr Henry Phillips and originally named cruciform, not sure exactly when but I do know the first commercial application was apparently when he sold them to Generall Motors in 1936 and all cadillacs from that era used the new ground breaking screws. Anyone got 36 caddie so we can check?
At about the same time (1907) some Canadian gent named Mr P L Robertson invented the square drive. Hence Robinson screws!
Most of the screws we sell still have the diameter of the shank measured in the old wire guage, Quite confusing to someone not familiar with screws.
Whilst the popularity of square drive screws have certainly taken off recently Aussies and Americans are consuming a huge amount of stainless steel square drive decking screws. Popular amonst some chippies and boat builders for the better purchase provided by the more robust internal square drive.
Still we are selling much more phillips head screws especially in marine grade stainless steel screws, whilst the phillips head may strip out a little easier the screw can be driven at a slight angle and faster than the square drive screws due to it's better centering, unlike the square drive wich needs the driver inserted reasonably straight.
With huge improvment in screw drivers these days and the adjustable clutch in even the cheapest battery drills we see less and less stripping of the drive system.
Square drive screws are certainly becoming easier to obtain we have a range of pan head and countersunk self tapping screws in stainless steel and also zinc plated. No galvanised square drive screws yet.
Phillips head self tappers are still more readily available and certainly cost less than square drive self tapping screws another advantage is almost everyone has a phillips head screw driver. Even my wife keeps a phillips head screw driver in the kitchen, But I doubt she has a square drive.
If anyone has anything to add to this or if I have it wrong, please let us know and I will add it to this text, Just send it in an email and I will paste it in.
Common standard commercial grade bolt and nut is grade 4.6 this is manufactured from mild steel with a hexagonal shaped head and often has 4.6 stamped on the face of the bolt/bolts. A lower quality bolt may have 2.6 or nothing stamped on the head. The standard thread length for Australian bolts is normally 2.5 x the diameter of the bolt, this rule applies to marine grade and high tensile and mild steel also. Available measured and named in both metric bolt and imperial bolt sizes. The most common and best priced is usually metric coarse (standard). Other bolt/thread sizes are metric fine,metric extra fine and metric coarse. Metric coarse is most common and cheaper to manufacture, and also imperial bolts unc, unf and whitworth to name a few. Shorter bolts tend to be fully threaded and are referred to as set screws. The same goes for stainless steel bolts.
Basicly a hex head set screw is any fully threaded hex head bolt. All are available in a range of materials all suitable for different applications. Some material examples would be high tensile, mild steel and stainless steel. there are many different varieties of high tensile mild steel and stainless steel fasteners, also many varieties of coatings and alloys. Some common examples of materials and coatings would be zinc plated, galvanized, 304 stainless steel,316 stainless steel, and 410 grade stainless steel.
Some other types of bolts are cup head bolts and coach screws both are usually mild steel or stainless steel bolts and are generally used for bolting timber. Both cuphead bolts and coach screws are available with zinc coating or hot dipped galvanized. The stainless steel bolt variety has a superior resistance to corrosion and is best for outside applications and the zinc bolts that cost less to manufacture are best in applications that are out of the weather gavanized bolts are somewhere in the middle.
New to our range, Fastener assortments, Usefull packs of various types of bolts nuts screws and washers. High tensile 6, 8, and 10millimeter bolts with flat washers and nuts. let us know if you would like variation or a custom fastener kit. Stainles steel bolt kits. Our containers have 12 compartments and sell for $7.90 they measure 310mm wide x200mm x50 mm Fischer brand made in Australia. Any fastener bolt or screw shorter than 95 mm fits into the compartments witch are 95mm long 50 deep and 45mm wide.
Basic technical information is in the product name and short description maximum grip range, diameter and over all length, grip range being the longest a thickness of materials to be riveted.
Good quality low price rivets are in stock and ready for next day delivery anywhere in Australia. We supply dome and countersunk in monel rivets, stainless steel rivets, aluminium, and many more. To view our rivet catalogue click this text.