If tightening continues, the bolt will stretch slightly – it will strain. While all 300 series stainless steels share this 18/8 mix, slight differences in chemical composition between the different grades of the 300 series do make certain grades more resistant than others against particular types of corrosion. Reference to Table 1 shows that the yield strength of a Grade 8 bolt is higher than the ultimate strength of a Grade 5 bolt. SAE fasteners come in a choice of either Unified National Coarse (UNC) or Unified National Fine (UNF). Grade G nuts are suitable with Grade 8 bolts. If there are no head markings at all, they are most likely comparable to the SAE grade 2. When tapping a hole, be sure the tap cuts the same class of thread as the screw or stud you intend to use. As the bolt threads into the nylon area it impresses its own threads into the nylon and the friction bond achieved resists loosening. @JMoss- We do not have any published information for the shear strength of stainless steel, but the rule of thumb is that shear strength is about 60% of tensile. The more specific you are in your call outs, the more expensive and less available your options. If you multiply that by the stress area of the screws, that will give you the shear strength of the screws. In summary – loose is useless and tight is right! It doesn't qualify us as technical experts. Caterpillar, Bowman) manufacture bolts to specifications that exceed those for SAE Grade 8 bolts. Should we use different material for the plates? All thanks and gratitude goes to Le_Meridian Funding Service and for the help of Mr, Benjamin for giving me a meaning to life when i had lost all hope. In addition to tensile strength, other mechanical factors in a connection should be considered, including yield strength and proper assembly of the parts. I will certainly consider upgrading to stainless steel bolts, but at least the grade 8 should be better than grade 5. ALWAYS! Finish with an even pull until the torque wrench clicks or indicates final torque, pause, and then pull again to check. They are available in a wide variety of strengths to suit different applications, from those that can be disassembled by hand to those that require the application of heat and power tools. We are specialized in providing High products made up of standard raw materials to our wide range of valuable customer base across the nation as well as International level.Fastener ManufacturerFastener ExporterFastener Supplier, Great Solution Company provides outstanding services under one roof related to legal, accounting, tax, secretarial services for an organization or individual entities at nominal charges. We don’t have the luxury of detailed instructions or the benefit of a major manufacturer’s years of engineering and research. We need to know most suitable material to manufacture spirit storage vats, fermentation vats (we use coconut toddy to make alcohol, and it is somewhat acidic PH is about 3.2). The most common stainless steel grade that is used in making fasteners is 18/8 stainless steel or Type 304. I purchased 1/2″ diameter thumbscrews labeled 18-8 stainless steel. “Stainless Steel” is the general name for a large family of alloy steels that contain at least 10.5% chromium as part of their composition. TCI Fasteners - Topcope In practice, most people call both bolts and screws, “bolts” – in the majority of this article the terms can be used interchangeably. And also let me know why don’t use SS304 for food grade applications? Sign up for our bi-monthly email newsletter for all the latest! It is tightened or loosened by turning a nut on the bolt’s threads. 16mm - 72mm : 600: 660: 830: Class 10.9 Alloy steel, quenched and tempered: 5mm - 100mm: 830: 940. A common question is A stainless steel bolt has the same PSI rating as a grade 5 bolt (125,000 PSI). In a bending load, the force is applied some distance from the support of the joint. The smart trick is to not use up their strength by over-torque - use the Grade 5 "grip" (torque spec's) and the difference in material strength will act as a reserve. To know more about nuts and bolts that are made from stainless steel and common steel, here are some of the properties associated with the mentioned materials. The most common grades of steel that are being used in fabricating nuts and bolts are Grade 2, Grade 5, Grade 8, and alloy steels. Though It Is Weaker Than 8:8 Heat Treated Steels, Which Are Quite Commonplace. The huge chromium composition of this stainless steel grade protects the iron from oxidation. As far as tensile strength which is superior 18-8 or 316? @Faqir – Portland Bolt does not have engineers on staff and cannot make material recommendations for specific applications. It is really nothing more than a chunk of steel into which is cut appropriate internal threads so that it may be screwed onto a bolt.      Bearing Surface – machined true and perpendicular to the shank, the bearing surface is the area through which the bolt is loaded in tension. Nuts and bolts out of this steel grade are utilized in difficult and demanding applications like automotive suspensions. Thirdly, if stressed beyond its “ultimate strength,” it will rupture. Shear strength of alloy steel is approximately 60% of its ultimate tensile strength. A grade 8 bolt has a stronger Not true. Even 304 or 304L will rust when constantly in a saltwater environment. @Hendra- We have some general purpose torque values on our website, but they are mostly for headed bolts in steel to steel connections. Note the bending load on the fastener. Do your 316 stainless bolts meet the specification for 316L (low carbon)? Other types of stainless steel that are utilized in making nuts and bolts are Type 316 and Type 410. Male Threads – the threads on a bolt, screw, or stud are known as "male," those on a nut or tapped hole are "female.". (the ratio of the Proof (or Yield ) stress and the Tensile strength expressed as a percentage = 100. As with any other tech topic, the wise fabricator/builder must apply this or any other technical information with great care, at his/her own risk, and always seek competent professional help when required. I am not familiar with the specifics of how it would be done, but cold working can change the grain structure and make the material more magnetic. @Amir – Portland Bolt does not have engineers on staff and cannot make recommendations as to the suitability of materials for specific applications. Why are teck screws labeled 18-8 as so magnetic. Can’t we use SS304 for the food grade applications? The second type of shear joint is a friction shear joint. Getting them right is critical, as the consequences of their all-too-common failure, ranges from embarrassing and frustrating to down-right scary. Using studs to hold a steel steering arm to a cast or forged steering knuckle is an excellent example of this principle. @Randy- ASTM F593 was written for general purpose service, not high temperature. Contact us. The thread pitch is the distance from a point on the thread to a corresponding point on the next thread measured parallel to the bolt’s axis (equal to 1 divided by the # of threads per inch). * Severe vibration in a joint can lead to bolt loosening. Thanx For Sharing.  +61 3 9336 0155 As for the magnetic question, the screws may or may not be magnetic, it depends on how they were processed. If you instead need the tighter chemical and mechanical requirements of F593, use that. They are magnetic and rust when left outside for a month or so. We'll send Exclusive Offers, New Releases, Jeep News & Videos right to your inbox. Stainless commonly comes in grades 18.8 (304) or T316. Note that almost all torque specifications published are for clean, dry threads. fastener distributor may make us knowledgeable and familiar with common we have a request for 3/4″ grade 8 stainless steel bolts to be used in an assembly. rating with a PSI of 150,000. What is the ASTM specification for stainless steel washers? Its purpose is to act as an increased load-bearing surface for either the head of the bolt and/or the face of the nut. Magnetism has more to do with the grain structure than the chemical make up, so it is certainly possible that your thumbscrews could be magnetic if they were manufactured in a way that aligned the grain structure just so. Customer service | Do 316L bolts need passivation for salt water environments and if so can your company do this inhouse? Is 18-8 strong enough or should I use 316? technical specifications. Super Engineers Manufacturer are best Exporters of Nuts, Bolts, Washers, screws, Threaded Roads all over in india. Precision drawell is one of the leading sfrc company.

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