M4 x 0.70p Metric Coarse Stainless A4-70 G316 Countersunk Head Socket (2.5mm Key) Screws DIN 7991
$5.00
In stock
SKU
31CS4M_configurable
- Countersunk Head Socket Screws sit flush with the surface of the material rather than protruding above it like other types of screws. Countersunk heads are commonly used in fixtures where the screw must be partially or fully concealed. A high tensile precision fastener that can be used to fasten components together by means of through holes and securing with a nut at the other end or they are screwed into a tapped hole with the matching thread
- Socket screws are either fully threaded or part 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. They are one of our most popular fasteners
- Also known as: Countersunk Allen Screws, Countersunk Allen Bolt, Flat Head Socket Screws, CSK Socket, CSK Allen Screws, Flat Head, CSS
- Material / Coating: Marine Grade Stainless Steel A4-70 G316 is the ultimate corrosion resistance fastener. Designed to be used in all conditions. The best fastener for marine, coastal, chemical and food environments. Stainless steels are largely non-magnetic but it is common for stainless steel fasteners to show a small degree of magnetism which is a result of work-hardening during the manufacturing process
- Can Stainless corrode?: Stainless steel is corrosion-resistant but not corrosion-proof and corrosion can occur if the material is installed or handled incorrectly. The use of tools and drills made from conventional steel during the installation of stainless steel fasteners may also lead to problems. Even the hardest of tools can produce debris that leaves minute steel particles on the stainless steel fastener surfaces or in pre-drilled holes. It is these particles that often rust when exposed to moisture or oxygen and can result in a stained or tarnished finish to the stainless steel material
- 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
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| System of Measurement | Metric |
|---|---|
| Product | Socket Allen Screw |
| Head Type | Countersunk Head |
| Size | M4 (4mm) |
| Size & Thread Pitch | M4 x 0.70p Coarse |
| Thread Pitch | 0.70mm |
| Thread Direction | Right Hand |
| Thread Type | Metric - Coarse |
| Corrosion Protection Level | Ultimate |
| Class / Grade | A4-70 G316 |
| Material | Stainless Steel |
| Length (l) | Select from the dropdown |
| Product Diameter (d) | 3.83 - 3.97mm |
| Head Diameter (a) | 7.53 - 8.00mm |
| Countersunk Angle (ca) | 90° |
| Head Height (h) | 2.48mm |
| Drive Size | 2.5mm |
| Drive Type | Internal Hex |
| Closest size in imperial | 5/32" |
| Standard Made To | DIN7991 |
| Brand | Hobson Engineering |
| Alternative Brands | Brighton Best | Inox World | Bremick Fasteners |
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