M3 (3mm x 4mm) Hex Socket Countersunk Machine Screw (Bolt) - Stainless Steel (A2) (Pack of 20)

Product Information

In addition to coarse and fine threads, there is another division of extra fine, or superfine threads, with a very fine pitch thread. Superfine pitch metric threads are occasionally used in automotive components, such as suspension struts, and are commonly used in the aviation manufacturing industry. This is because extra fine threads are more resistant to coming loose from vibrations. [8] Fine and superfine threads also have a greater minor diameter than coarse threads, which means the bolt or stud has a greater cross-sectional area (and therefore greater load-carrying capability) for the same nominal diameter. The relationship between the height H and the pitch P is found using the following equation where θ is half the included angle of the thread, in this case 30°: [3] H = 1 2 tan ⁡ θ ⋅ P = 3 2 ⋅ P ≈ 0.866025 ⋅ P {\displaystyle H={\frac {1}{2\tan \theta }}\cdot P={\frac {\sqrt {3}}{2}}\cdot P\approx 0.866025\cdot P}

ISO/TC/ 1 Business Plan, 2007-03-05, Version 1.3. Table 3: The market share of each screw thread, p. 7. It is worth noting that there is no direct link here between the head size of an imperial screw and the gauge of that screw. It is purely coincidence that, from screw gauges 6- upwards, that the gauge is close to twice the head diameter although some sources would have you believe this is how the gauge is calculated.Below are some common spanner (wrench) sizes for metric screw threads. Hexagonal (generally abbreviated to "hex") head widths (width across flats, spanner size) are for DIN 934 hex nuts and hex head bolts. Other (usually smaller) sizes may occur to reduce weight or cost, including the small series flange bolts defined in ISO 4162 which typically have hexagonal head sizes corresponding to the smaller 1st choice thread size (eg. M6 small series flange bolts have 8mm hexagonal heads, as would normally be found on M5 bolts). [9] The length is given next and it should be remembered that the length given for a screw is the length that is buried in the wood or other material, it does not include the head of a raised, or domed headed screws.

Head diameter in sixteenths is an inch X 2 ) – 2 = Gauge. E.g. 5/16 head times two equals 10, minus two equals 8. The Gauge is 8. These terms contain the entire agreement between the Company and you (hereafter ‘the Agreement’). No addition, alteration, substitution or waiver of these terms will be valid unless the Company has expressly accepted this in writing. The terms of the Agreement shall override and supersede any previous negotiations, agreements or arrangements between you and the Company. The contents of clauses 1, 3, 5, 6, 9, 10, 11, 12 and 13 of the Company General Terms and Conditions of Sale of Goods shall apply with the necessary changes (mutatis mutandis) to any contract for hire of goods by the Company to you and in the event of any conflict of those terms and these Standard Terms and Conditions for Hire of Goods, the former shall take precedence. at any time Company has reasonable grounds to believe that any of the events mentioned in 12.1.1 andNotwithstanding the foregoing, time of delivery of goods shall not be of the essence of this Agreement. Any delivery times that the Company may offer you are offered purely as a guide and the Company accepts no responsibility should the goods not be delivered on the guide dates advised, whether this is due to factors within or outside the Company’s control. The repaired or replacement goods will be delivered to the original place of delivery and are otherwise subject to the provisions of this Agreement. A wood screw is sized by two different numbers. First is the Gauge of the screw which refers to the diameter – the larger the number, the larger the diameter. A number 4 screw is much smaller than a number 12 screw. If for any reason you do not accept delivery of the goods when they are ready for delivery, or the Company is unable to deliver the goods on time because you have not provided appropriate instructions, documents, licences or authorisations, then (i) risk in the goods will pass to you (including for loss or damage); (ii) the goods will be deemed to have been delivered; and (iii) the Company may store the goods until delivery, and you will be liable for all related costs and expenses. any event in a foreign jurisdiction analogous to, or comparable with 12.1.2.1 to 12.1.2.3 above; or

The M apparently stands for Metric which sounds plausible, although we cannot verify this. What it indicates however it that the number following it is the diameter of the screw (or bolt) in millimetres. The length of a machine screw or bolt is indicated by an × and the length expressed in millimetres (e.g. M8-1.25×30 or M8×30). [ citation needed] the Company is satisfied that the defects arise solely from faulty design (other than a design made, furnished or specified by you for which the Company has disclaimed responsibility in writing), materials In the examples shown above, the M6 is a 6mm wide screw (at the threaded part, not the head) and the M8 is 8mm wide. Other Acronyms and Abbreviations used to Describe Screws Delivery will be made to the location that you designate. It is your responsibility to ensure that a responsible person is available to accept the delivery and to secure the goods at the delivery location. The Company shall not be liable for any damage or fault arising from incorrect storage of the goods.If you need to make sure that you have the right size screw for the job, then please read on below. Metric Imperial Screw Conversion Chart Nothing in these terms shall limit the Company’s liability for death or personal injury caused by its negligence. consequential loss, that you may incur as a result of the non-availability of any item on any date.

ST – Self Tapping; These screws have a tip that will allow them to be screwed into (typically wood) without a pilot hole being drilled. This saves a lot of time! If you or the intended recipient are not available when the Metro Fixings delivery driver/parcel carrier attempts delivery, a delivery card will be popped in your letter box. Please follow the instructions on the card to rearrange delivery. Alternatively, please call our Sales Team on 01707 375172 and we will be able to assist with a second delivery attempt.

The products we supply fall into two categories and we have differing policies depending on which type of product it is you wish to return; If, on the rare occasion we have delivered you faulty, incorrectly supplied or defective goods, Metro Fixings will arrange a collection, repair or replacement and delivery service free of charge. ISO 262:1998 ISO general purpose metric screw threads – Selected sizes for screws, bolts and nuts. International Organization for Standardization. 17 December 1998. The Company’s failure or delay to exercise any of its rights under the Agreement shall not be a waiver or forfeiture of such rights.