M8 x 1.25p Metric Coarse Plain Black Uncoated Class 12.9 Button Head Socket (5mm Key) Screws ISO 7380
As low as
$5.00
In stock
SKU
31B8P_configurable
- Button Head Socket Screws have a larger bearing surface, low profile head and are installed using an allen key. Button socket screws provide a larger bearing surface and a lower head profile than a socket head cap screw and are generally used when the material is too thin to countersink, or decorative finish is desired. Use a hex key also called an Allen wrench or hex power bit to drive a socket screw. The tensile strength isn’t as high as a socket head cap, but as a comparison they are twice the strength of a machine screw
- They are fully threaded and have uniformly threads, meaning they maintain the exact same diameter throughout the entire length of the threaded section of the fastener, unlike self tapping or chipboard screws which have tapered threads
- Also known as: Socket Button, Button Allen Head, Button Hex, Allan Bolt, BHSS
- Material / Coating: Black or plain finish is unfinished (bare steel) has no actual protective coating. You will not have any corrosion resistance and the product will rust over time. The term “black” is an old industry term for plain finish. Depending on the material grade and heat treatment process the colour can vary from a shiny oily finish to a dull black
- Galling: can occur when excessive pressure is used to tighten a nut onto a thread, common with stainless fasteners but can also be an issue with other materials. Fasteners with damaged or fine threads are particularly prone to galling.
Some suggestions to help prevent thread galling:
Tightening the nut more slowly without excessive pressure, will frequently reduce or sometimes solve completely, the problem. As the installation RPM speed increases, the heat generated with friction during tightening escalates the chances of thread galling.
Reduce the friction by applying a suitable lubricant to the thread frequently eliminates thread galling. Typical lubricants are chloride-paraffine, molykoat lacquer, molybdenum disulphide, high pressure oil, graphite, mica, or talc, some assemblies where there is extreme pressure, corrosion resistant grease or waxes may also be effective - Thread Pitch (Metric): is the distance between the peaks of two threads along a screw, bolt, nut or fastener expressed in millimetres (mm). Used when referring to Metric parts. For example, a thread pitch of 1.50mm means that the distance between one thread and the next is 1.50mm
- Fastener Length: is generally measured from the point where the surface of the material will be when the fastener is installed to the end of the fastener. Thus, fasteners with heads that sit above the surface are measured from under the head to the end of the fastener, while fasteners that sit flush with the surface are measured from the top of the head to the end of the fastener
- Measurements: Thread Lengths have been included as a guide only. Due to stock being sourced from multiple suppliers variations do exist. We will always ship the same brand and thread length but subsequent orders may be another brand and the thread length may be slightly different. If thread length is critical, please message us, we are happy to physically check our stock and advise prior to shipping
- Measurements: Every effort has been made to ensure all measurements on our site are accurate and to the relevant standard, they should only be used as a guide. If you see a problem with our specifications please contact us
- Dimensions: Our stock is sourced from various suppliers, therefore differences may exist between batches such as head dimensions, thread lengths visible stamped head markings, appearance or actual finish
- Driver bits to suit:A large range of suitable driver bits are in the "Drilling, Driving and Tools" section of our website
- Photos: are of the product but may not be the actual diameter, height, width, length you may require, always refer to the size in the description and additional specifications data provided prior to ordering
- Updating our site: If you see any problems with any of our specifications or you require additional information please contact us
- Disclaimer: Technical data and specifications were 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
- Buy with confidence: ⇒ 10+ years experience selling online, > 19,000 stock lines, > 80 million pieces ex stock in Brisbane QLD
- Prices: include GST, a Tax Invoice and Free Standard Delivery anywhere in Australia
| System of Measurement | Metric |
|---|---|
| Product | Socket Allen Screw |
| Head Type | Button Head |
| Size | M8 (8mm) |
| Size & Thread Pitch | M8 x 1.25p Coarse |
| Thread Pitch | 1.25mm |
| Thread Direction | Right Hand |
| Thread Type | Metric - Coarse |
| Corrosion Protection Level | Poor |
| Class / Grade | High Tensile Class 12.9 |
| Material | Alloy Steel Heat Treated |
| Finish | Plain Black Uncoated |
| Length (l) | Select from the dropdown |
| Product Diameter (d) | 7.78 - 8.00mm |
| Head Diameter (a) | 13.57 - 14.00mm |
| Head Height (h) | 4.05 - 4.40mm |
| Drive Size | 5mm |
| Drive Type | Internal Hex |
| Closest size in imperial | 5/16" |
| Standard Made To | ISO7380 |
| Brand | Hobson Engineering |
| Alternative Brands | Brighton Best |
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