Stainless Steel 316 stud Bolts are made up of an austenitic stainless steel that is corrosion resistant and strong. In high temperature environments, Stainless Steel 316 stud Bolts can form a dense oxide film to prevent further oxidation reactions and have good anti-oxidation properties. This makes it suitable for some high-temperature equipment and pipeline connections.
Due to its chemical composition, SS316 stud bolts have excellent resistance to a variety of chemicals, including seawater, chemical solutions, acidic and alkaline substances in food processing environments, etc. In marine environments, ordinary carbon steel bolts will quickly rust and corrode, while SS316 stud bolts can resist the erosion of seawater for a long time and maintain the stability of the connection.
316 Stud Bolts and A193 B8M Stud Bolts have the same strength requirement and exceptional corrosion resistance. B8M grade Bolts are made using high corrosion resistance stainless steel material. ZIZI a leading manufacturer and supplier of the different types such as the 316 Stainless Steel Screws in different sizes and standards. The specifications are ASTM and ASME A193 and 194. There are different standards according to the DIN, ASTM, BS and the UNS S31600 Bolt types.
What is a stainless steel stud?
SS studs are fastening devices composed of corrosion-resistant stainless steel. They can be used in various applications and environments, offering superior strength and durability to alternative materials such as zinc or brass. Due to their resistance to rust and corrosion, SS studs provide increased product lifetime for the components they are securing together. Furthermore, since they don’t require additional protective coatings such as paint or galvanization, they are far more cost-effective than other fasteners.
Stainless Steel 316 Stud Bolts Specification
| Specification | ASTM A 193 / ASME SA 193 |
| Stud Bolts Length | 3 mm to 200 mm |
| Stud Bolt | UNF, BSW, BSF, METRIC, UNC, or as required |
| Standard of Stud Bolts | DIN 525, DIN 835, DIN 938, DIN 939, DIN 940, DIN 949-1, DIN 949-2, DIN 975, DIN 976, DIN 2509, BS 2693, BS 3692, BS 4439, IS 1862, IS 13178, ANSI/ASME B18.31.2, ANSI/ASME B16.5 |
| Form of Stud Bolts | Hex, Threading, Square, Round as per Gauge Etc. |
| Popular Types of Stud Bolt | Stud Bolts, Fully Threaded Stud Bolts, Tap End Stud Bolts, Double End Stud Bolts, Stud Bolts with Reduced Shank, Reduced Shank, Flange Stud Bolts, Flange Bolting, Weld Studs |
ASTM A193 Standard Scope
This specification covers alloy and stainless steel bolting materials and bolting components for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications. See Specification A962/A962M for the definition of bolting. Bars and wire shall be hot-wrought and may be further processed by centerless grinding or by cold drawing. Austenitic stainless steel may be carbide solution treated or carbide solution treated and strain-hardened. When strain hardened austenitic stainless steel is ordered, the purchaser should take special care to ensure that Appendix X1 is thoroughly understood.
Nuts
Bolts,studs,and stud bolts shall be furnished with nuts,when specified in the purchase order.Nuts shall conform to Specification A194/A194MM.
Coatings on Bolting Components
It is the purchaser’s responsibility to specify in the purchase order all information required by the coating facility Examples of such information may include but are not limited to the following:
Reference to the appropriate coating specification and type, thickness, location, modification to dimensions,and hydrogen embrittlement relief.
Reference to Specifications A153/A153M, B633. B695, B696, B766, 0r F1941/F1941M,F2329/F2329M, or Test Method F1940,or other standards.
Marking Coated Bolting Components
Bolting components coated with zinc shall have ZN marked after the grade symbol.Bolting components coated with cadmium shall have CD marked after the grade symbol.Nore S14.1-As an example,the marking for zinc-coated B7 will now be B7ZN rather than B7*.
Heat Treatment
Austenitic Stainless Steels：
All austenitic stainless steels shall receive a carbide solution treatment(see 6.2.2-6.2.5 for specific requirements for each class).Classes 1,1B,1C(Grades B8R and B8S only),2,2B,and 2Ccan apply to bar,wire,and finished bolting components.Class 1A(all grades)and Class IC(grades B8RAand B8SA only)can apply to finished bolting components.Class ID applies only to bar and wire and finished bolting components that are machined directly from Class ID bar or wire without any subsequent hot or cold working.
Class ID-Rolled or forged Grades B8,B8M,B8PB8LN.B8MLN.B8CLNCuB, B8N, B8MN. B8R,and B8Sbarshall be cooled rapidly immediately following hot working while the temperature is above 1750°F [955’℃]so that grain boundary carbides remain in solution.Class ID shall be restricted to applications at temperatures less than 850 °F[455℃]
What are the coatings for stainless steel bolts?
– PTFE Coated Stud Bolts
– Phosphate Coating
– Teflon Coating
– Zinc Coating
– Hot Dipped Galvanizing Coating
– Cadmium Coating
– Xylon Coating
Commonly used coatings are galvanized coatings and Teflon coatings, which are described in detail as follows:
Hot Dipped Galvanizing Coating
Definition and process：Hot-dip galvanizing is a process in which the rust-free steel workpiece is immersed in molten zinc liquid, causing a series of physical and chemical reactions between the steel and the liquid zinc to form a continuous and dense metal coating composed of different zinc-iron alloy layers and pure zinc layers on the steel surface.
Good corrosion resistance: Zinc can react with oxygen in the air to form a dense zinc oxide film, which can prevent further oxidation and provide good protection for the steel matrix. Especially in some outdoor environments, humid environments or slightly corrosive industrial environments, the galvanized layer can significantly extend the service life of metal products.
Teflon coating
Definition and principle: Teflon coating is a coating with polytetrafluoroethylene as the main component. It is applied to the metal surface through spraying, dipping and other processes, and then sintered at high temperature to make it firmly adhere to the metal surface to form a Apply an even coat.
Extremely low friction coefficient: Teflon coating has an extremely low surface friction coefficient, which makes the surface of the coated object very smooth, can effectively reduce friction and wear between objects, improve the operating efficiency of mechanical equipment, and reduce energy consumption. Consumption.
Length Tolerances for Bolts
| Nominal Length | Nominal Size | |||||
| 1/4 to 3/8 | 7/16 and 1/2 | 9/16 to 3/4 | 7/8 and 1 | 1 1/8 to 11/2 | Over 1 1/2 | |
| Up to 1 in,incl. | 0.02 | 0.02 | 0.02 | |||
| -0.03 | -0.03 | -0.03 | ||||
| Over 1 in.to 2 1/2 in,incl | 0.02 | 0.04 | 0.06 | 0.08 | 0.12 | 0.18 |
| -0.04 | -0.06 | -0.08 | -0.1 | -0.12 | -0.18 | |
| Over 2 1/2 in.to 4 in,incl | 0.04 | 0.06 | 0.08 | 0.1 | 0.16 | 0.2 |
| -0.06 | -0.08 | -0.1 | -0.14 | -0.16 | -0.2 | |
| Over 4 in.to 6 in,incl | 0.06 | 0.08 | 0.1 | 0.12 | 0.18 | 0.22 |
| -0.1 | -0.1 | -0.1 | -0.16 | -0.18 | -0.22 | |
| Longer than 6 in. | 0.1 | 0.12 | 0.14 | 0.16 | 0.22 | 0.24 |
| -0.18 | -0.18 | -0.18 | -0.2 | -0.22 | -0.24 | |
Stainless Steel 316 Stud Bolts Material
Chemical Composition of Stainless Steel A193 B8M / 316 Stud Bolts
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni |
| 316 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 16.00 – 18.00 | 2.00 – 3.00 | 11.00 – 14.00 |
| 316L | 0.035 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 16.00 – 18.00 | 2.00 – 3.00 | 10.00 – 14.00 |
| 316H | 0.10 max | 0.10 max | 0.75 max | 0.045 max | 0.030 max | 16.00 – 18.00 | 2.00 – 3.00 | 10.00 – 14.00 |
Mechanical Properties of Stainless Steel A193 B8M / 316 Stud Bolts
| Grade | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 316/316L/316H | 8.0 g/cm3 | 1400 °C (2550 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35% |
ASTM A193 SS B8M / 316 Stud Bolts Equivalent Grades
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
| SS 316 | 1.4401 / 1.4436 | S31600 | SUS 316 | 316S31 / 316S33 | – | Z7CND17-11-02 | X5CrNiMo17-12-2 / X3CrNiMo17-13-3 |
Which is better 304 or 316 stainless steel bolts?
Most stainless steel ordered around the world is Grade 304.
It offers the standard corrosion resistance, formability, strength, and easy maintenance for which stainless is known.
While 316 comes in second in terms of quantities sold, it offers vastly superior corrosion resistance to chlorides and acids.
Corrosion resistance
Stainless Steel 304 stud Bolts : In general atmospheric environment, fresh water environment and some not-so-strong acid and alkali environment, it has good corrosion resistance and can resist common oxidation and rust.
Stainless Steel 316 stud Bolts : Due to the effect of molybdenum, its corrosion resistance is better, especially in the environment containing chloride.
Processing performance
304 stainless steel stud bolts: Good processing performance, easy to carry out cold heading, hot forging, cutting and other processing processes, can efficiently produce bolt products of various specifications and shapes. This makes it cost-effective in large-scale production and diversified applications.
316 stainless steel stud bolts: The processing performance is also good, but due to the presence of molybdenum, its processing difficulty is slightly higher than 304. During the processing process, stricter process control and tool selection may be required, and the production cost will also be slightly higher.
In summary, if the use environment is relatively ordinary, the corrosion resistance requirements are not extremely harsh, and cost factors need to be considered, 304 stainless steel bolts are a better choice; if it is in an environment with high corrosion risk, especially involving chlorides or strong chemical corrosive media, in order to ensure long-term reliability and safety, 316 stainless steel bolts are more suitable even if the cost is higher.
What are the disadvantages of Stainless Steel 316 stud Bolts ?
1. High cost
2. Relatively poor processing performance
3. Limited high temperature performance
4. Magnetic problems
5. Insufficient resistance to certain specific media
How to overcome the disadvantages of Stainless Steel 316 stud Bolts ?
The following measures can be taken to overcome the disadvantages of 316 stainless steel bolts:
Dealing with the problem of high cost
Optimize design: Avoid over-design and reduce unnecessary use of materials by accurately calculating the required strength and load-bearing capacity, thereby reducing costs.
Improve processing performance
Pretreatment: Before processing, the 316 stainless steel material is properly pretreated, such as annealing, to reduce the hardness and internal stress of the material, improve its plasticity, and thus reduce the difficulty of processing.
Improve high temperature performance
Surface coating treatment: For 316 stainless steel bolts that need to be used in high temperature environments, surface coating technology can be used to improve their high temperature oxidation resistance.
Solve the magnetic problem
Solution treatment: By heating the bolt to a certain temperature (usually between 1000-1150℃) and maintaining it for a period of time, and then rapidly cooling it, the carbides and other precipitated phases in the steel are fully dissolved, thereby restoring the uniformity of its austenite structure and reducing magnetism.
Enhance resistance to specific media
Use higher grade corrosion-resistant alloys or composite structures: For extremely harsh chemical environments, consider using higher grade corrosion-resistant alloy bolts, such as super stainless steel with higher molybdenum content, nickel-based alloys, etc.
What grade bolt is 316 stainless steel?
| Grades | European Number | ASTM grade |
| 316 | 1.4401 | ASTM A 193 Gr B8M |
| 316 L | 1.4404 | ASTM A 320 Gr B8M |
Recommended Hardware
| Nuts | Washers |
| ASTM A194 Grade 2H | ASTM F436 Type 1 |
Reference Standards
ASTM A153/A153M : Specification for Zinc Coating Hot Dip Galvanizing on Fasteners.
ASTM A194/A194M : Specification for Carbon and Alloy Steel Nuts for ASTM A193 Bolts.
ASTM A320/A320M : Specification for alloy-steel and stainless steel bolting for low temperature service.
ASME B18.2.1 : Square and Hex Bolts and Screws.
ASME B18.2.3.3M : Metric Heavy Hex Screws
ASME B18.3 : Hexagon Socket and Spline Socket Screws
ASME B18.3.1M : Metric Socket Head Cap Screws
Applications and Uses
Chemical Industries
Oil & Gas Industries
Power Plant Industries
Shipbuilding Industries
Fertilizer Industries
Petrochemical Industries
Sugar Industries
Cement Industries
You can get an offer for stainless steel in below material forms:
-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249)
-Fitting and Flange (ASTM A182)
-Round bar ，Billet (ASTM A276, ASTM A479)
– Plate, Sheet, Strip(ASTM A240, EN 10028-7，A480)
-Bolting, Nuts（ASTM A193, A194）
Stainless Steel 316 Stud Bolts Exported Countries
We Export Stainless Steel 316 Stud Bolts to Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen , Syria, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Cambodia, Argentina, Bolivia, Brazil, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Jamaica, Bahamas, Denmark, Norway, Germany, France,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan, Europe, Africa, Asia, North America, South America, Middle East.etc
Latest News
02 8 月 2019Copper Nickel Flanges UNS C70600Zizi offers ISO certified copper nickel flanges, stores large quantity of Cu-Ni 90/10 weld neck flan... 
29 7 月 2019Stainless Steel Buttweld Fittings ManufacturerZizi is stainless steel buttweld fittings manufacturer, we offer stainless steel pipe elbow, tee, ca... 
19 7 月 2019Steel Pipe Nipple Types, Dimensions and MaterialsBasic pattern of steel pipe nipple is a short piece of pipe with threads at both end or at one end....