• Stainless Steel Nuts and Bolts Available on Sale, by India’s Largest Stockholder and Manufacturer in Seamless & Welded Form. Stainless fasteners are used to fight corrosion. Contrary to popular belief stainless steel fasteners are not stronger but they do provide superior resistance to rust, staining and corrosion. When looking for fasteners to fight the outdoor elements, especially water, stainless steel nuts, bolts, screws and washers should be your first choice. Stainless steel finish is determined by the amount of chromium present in the material.
  • Metallica provides the value added services, such as the heat treating, cutting, machining, painting and assembly. Metallica makes it easy for you to source top quality stainless steel nuts and bolts at the lowest prices in India. We specialize in providing deliveries to your factory directly from our warehouse or our principal suppliers.
  • We offer a wide selection of specialty stainless steel nuts and bolts; and best pricing for bulk nut orders. A complete range of stainless steel nuts and bolts are in stock and ready to dispatch.  Specialty bolts ranging from tiny to extra long and even extra large bolts are available in many grades and drives.
  • Biggest manufacturer and exporter of larger diameter hex bolt in India, diameter range from M-20 to M-100 in DIN 931 / 933 / 912 in grades SS 304, 316, 316L , 316S31 and 316S33 and A2 and A4 in A2-70 & A4-70
  • Stainless steel / INOX grade hex bolts in A2, A4 in DIN 931 / 933 in bigger diameters from M-20 to M-100
  • We are top manufacturers, stockholder and suppliers of stainless steel nuts and bolts in accordance with DIN, ASME, ASTM and ISO standards such as ASTM A193 (for bolts) and ASTM A194 (for nuts) and grades including 304/304L, 310S, 316/316L, 316Ti, 321/321H, 347/347H, 904L, 410, 410S, Alloy 20, Duplex & Super Duplex. All our stainless steel nuts and bolts are supplied with 3.1 specific test certificates, according to EN 10204. Certification according to 3.2 can be agreed at the time of ordering.
Stainless Steel Nuts and Bolts Manufacturer, Wholesaler, Dealer, Supplier and Distributor In India and Abroad
  • As one of the largest manufacturer of Stainless Steel Nuts and Bolts, we have over 6000 tons in stock

  • Stainless Steel Nuts and Bolts Available at around Rs. 300/KG for Sale in India.

  • Our Annual Sales Volume for Stainless Steel Nuts and Bolts is Over 25,000 tons in India and Overseas.

  • Stainless Steel Pipes and Tubes, are Sold with Complete Range of Related Pipe Fittings and Flanges

  • On-Time Delivery with Quality Assurance and Price Guarantee for Stainless Steel Nuts and Bolts

  • Email Us on sales@metallicametals.com | Call Us On +918928722715.

  • Buy unique variety of top quality ASTM A193 Stainless Steel Bolts and Nuts at discounted price, dimensions range from M3 to M100.

  • Metallica makes it easy for you to source top quality stainless steel nuts and bolts at the lowest prices in India. We specialize in providing fast deliveries to your factory directly from our warehouse or our principal suppliers.

Types of Stainless Steel Nuts and Bolts

201    (1Cr17Mn6Ni5N) 202    (1Cr18Mn8Ni5N)
304    (0Cr18Ni9) 304L  (00Cr18Ni10)
316    (0Cr17Ni12Mo2) 316L   (0Cr17Ni14Mo2)
321/321H 409
409L 430

Types of Stainless Steel Nuts

Hex Nuts
Wing Nuts
Square Nuts
Cap Nuts

Types of Stainless Steel Bolts

Hex Bolts in M3 – M160 Plow Bolts
Socket Head Bolts Eyelet Bolts
Carriage Bolts Stud Bolts
Elevator Bolts Square Bolts
Flange Head Bolts Stud Bolts
Lag Screw Bolts Cap Bolts

We Manufacture and Supply Multiple Steel Grades and Finishes for Bolts with choices of small to large and short to extra Long Bolt Sizes

Stock Range of Stainless Steel Nuts and Bolts

Product Stainless Steel Nuts and Bolts
Grades SS 304, 316, 316L , 316S31 and 316S33 and A2 and A4 in A2-50,  A2-70, A2-80 &k A4-50, A4-70 and A4-80 in DIN 931 / 933
Standards ASTM A193 B8 , B8M , B8T , B8C , B6, DIN, ISO, EN, BS, IS, JIS, 931, 933, 912,  DIN EN ISO  4014, DIN EN ISO 4017, IS 1363, IS 1367
Size Range M-20 diameter to M-100  and Inch 3/4″ to 4″in length
Length Upto 1500 mm
Application Water projects, water pipelines, sewage water treatment plants, desalination plants and waste water treatment plants
Finish Bright polished and cleaned, Plain, black, zinc plated (Cr,3+), zinc plated(Cr,6+), hot dipped galvanized, dacromet, nickel plated, cadmium plated, etc.
Packing In Bulk: Canton/pallet, Small Boxes/carton/ pallet, or customer request
Bolt Drives Allen or socket drive, hex head drive, Torx drive and square drives.
Threads Bolts can come fully or partially threaded depending on the bolt type. International Organization for Standardization (ISO) standards for threads are: length is twice the diameter of the bolt plus 1/2 inch. If you are looking for fully threaded bolts please call direct at 800-872-5557
Tests Performed Hardness tests, proof of load tests, and cone proof load tests shall be made to all nuts to meet the requirements specified.
Test Certificate Manufacturer Test Certificate as per EN 10204 / 3.1

What are Stainless Steel Bolts and Nuts?

A stud bolt consists of one threaded steel rod and two (matching) hexagonal heavy steel nuts. Stud bolts and nuts are essential components of flanged joints, as they are key to seal flanged joints properly. The ASTM A194 specification covers a variety of carbon, alloy, and martensitic and austenitic stainless steel nuts. Hex heavy nuts are components of boltings sets for flanges. The ASTM A193 is the standard specification for alloy-steel and stainless steel bolts used in high-temperature or high-pressure environments or other special-purpose applications. The ASME B16.5 specification covers stud bolts and nuts for ASME flanges. Stud bolts and nuts are available in multiple diameters and lengths combinations, metric and imperial, and in a variety of materials from carbon steel to alloy, stainless and nickel alloys. The material of the hex steel nuts shall match the material of the threaded rod (generally, stud materials ASTM A193 match with nuts materials ASTM A194).

What are the Applications of Stainless Steel Nuts and Bolts?

  • Stainless Steel Bolts and nuts for water projects, water pipelines, sewage water treatment plants,desalination plants and waste water treatment plants in SS 304, SS 316 and SS 316L grades.
  • Bolts and nuts are used in several applications, with a primary function to hold things or components together. A bolt, also known as a screw, does not always have to be used together with a nut; however, a nut is always used together with a bolt.
  • The purpose of inserting bolts into other materials is to bind that material with another object. For example if one material is required to be bonded with another, a bolt could be run through these two materials and a nut on the other side could be used to secure the materials together tightly.
  • Nuts and bolts serve as the fundamental components in several construction projects as they provide strong bonds that do not break even under great amounts of pressure.
  • For companies involved in Equipment Manufacturing, Mining, Oil Refineries, Chemical manufacturing, Steel and Aluminum Manufacturing, Utilities and Transportation, and Industrial Construction.

What are the Advantages of Stainless Steel Nuts and Bolts? Difference Between Stainless Steel Bolts and Welding / Riveting

  • Light weight
  • Flexibility
  • Toughness
  • Chemically Inert
  • Resistance to Abrasion
  • Smooth surface
  • Environmental stress crack resistance
  • Corrosion resistance
  • Frost & rodent resistance
  • Hygienic safety
  • Easy & quick installation
  • Non-magnetic
  • Easy Availability
  • Inexpensive
  • Stainless Steel Bolts Have an Excellent Life Cycle
  • Better Visual appeal
  • Easier Replacement of Parts
  • In some important cases, some anti-loose measures will be taken to ensure the reliability of the nut locking. The use of lock nut is one of the anti-loose measures. The working principle of the nut is self-locking by the friction between the nut and the bolt.
  •  They are easily disassembled, as opposed to something like riveting or welding, which requires cutting.
  • They can be designed to take tension loads, unlike riveting (by tightening the bolt/nut to develop a preload, you reduce the effects of fatigue due to cyclic loading, which you can’t do with a rivet; plus, rivets can easily pull through a hole when loaded in tension).
  • Welds require heating a metal, which can change the properties in the heat-affected zone, and can also create thermal stresses. Bolts avoid this problem. You’re also not likely to start a fire (welds) or breathe toxic fumes (welds and adhesive joints) when you’re installing a bolt.
  • Bolted joints aren’t particularly sensitive to the condition of the parent material. With welds and adhesive joints, the parent material needs to be clean, free of oils, etc (and obviously, it has to be metal to weld).
  • You can put a bolt in a blind hole (one that doesn’t go all the way through the material); you can’t use a rivet.
  • Bolts are easy. Welding takes a lot of skill and a lot of time, particularly if you’re going to inspect the weld for flaws after it’s completed. But just about everybody has used a wrench.
  • Bolts offer much better joint quality than a screw, mostly because the threads are more tightly controlled.

What are the Disadvantages of Stainless steel Nuts and Bolts?

  • Difficulty of Refastening
  • Forced Precision
  • The working principle of the nut is self-locking by the friction between the nut and the bolt. However, the reliability of this self-locking in dynamic loads is reduced.
  • They require access to both sides of the joint (although this can be overcome using studs or special bolts like Hi-Loks). Welding, adhesive joints, and some types of riveting can be done with access to only one side of the joint.
  • They can become loose over time as the nut backs off (this can be addressed to some extent by using the proper preload and thread-locking features) or as the material creeps. Welding and adhesive joints don’t have this problem.
  • They require holes, which introduce stress concentrations and more failure modes; drilling the holes may create cracks which will grow over time to cause failure. Welding and adhesive joints don’t require holes. Also, welds and adhesive joints are continuous, so they don’t concentrate load like a bolt does.
  • Preload can be tough to measure accurately – it depends on the method of tightening, the friction between the threads of the bolt and the nut, etc.
  • Complexity. A bolted joint adds to a part count – a bolt, a nut, washers, thread lubricant, thread locking compound. And the bolts, nuts, and washers come in specific sizes with specific threads, with specific hole sizes and tolerances, for specific applications – if you need a high quality joint, you’ve got to keep track of all that and make sure the right bolt is used in the right place and in the right way.
  • Damage to a threaded hole is tough to replace – you can drill it out and rethread, but using a larger bolt might change your load distribution. To avoid that, you can use an insert in the parent material – basically a tube that is threaded on the outside and on the inside, but that adds complexity. (Of course, all this is related to the advantage of actually being able to disassemble and reassemble a bolted joint, so you might not actually call it a disadvantage compared to other fastening processes.)
  • Corrosion between a bolt and the parent material should be considered. This may not be a problem with welding and adhesive joints if the parent materials being welded are compatible.
  • Bolted joints require a gasket to seal a joint. A weld (if done properly) will be leak-proof.
  • Bolted joints aren’t so easy after all – I know of robots that weld, but the manual dexterity needed to install a bolt still requires a human touch. (Although if you have a job installing bolts, you might consider this an advantage!)

Manufacturing Process of Stainless Steel Nuts and Bolts?

Hot Gorging Method is used for stainless steel nuts and bolts. 100% machining on CNC machines for better quality and productivity

Materials Used for Stainless Steel Nuts and Bolts?

Materials used for Stainless Steel Nuts

  • Stainless steel 18-8 (A-2)
  • Stainless steel 316 (A-4)
  • Zinc plated steel
  • Zinc plated class 8.8 steel
  • Zinc plated class 10.9 steel
  • Chrome plated steel

Chemical Composition Of Stainless Steel Bolts and Nuts

Chemical Composition %
Grade C Si Mn P S Ni Cr Mo N
201    (1Cr17Mn6Ni5N) ≤0.15 ≤1.0 ≤5.5 ≤0.06 ≤0.03 3.5-5.5 16.0-18.0 ≤0.25
202    (1Cr18Mn8Ni5N) ≤0.15 ≤0.07 ≤7.5 ≤0.06 ≤0.03 4.0-6.0 17.0-19.0 ≤0.25
304    0Cr18Ni9) ≤0.08 ≤0.07 ≤2.0 ≤0.04 ≤0.03 8.0-11.0 18.0-20.0
304L  (00Cr18Ni10) ≤0.03 ≤0.07 ≤2.0 ≤0.04 ≤0.03 8.0-11.0 18.0-20.0
316    (0Cr17Ni12Mo2) ≤0.08 ≤0.07 ≤2.0 ≤0.04 ≤0.03 11.0-14.0 16.0-18.0 2.0-3.0
316L   (0Cr17Ni14Mo2) ≤0.03 ≤0.07 ≤2.0 ≤0.04 ≤0.03 11.0-14.0 16.0-18.0 2.0-3.0
321     ≤0.08 ≤1.0 ≤2.0 ≤0.04 ≤0.03 9.0-12.0 17.0-19.0 Ti≥5xC
409 ≤0.08 ≤1.0 ≤1.0 ≤0.04 ≤0.03 ≤0.5 10.5-11.7 Ti6xC%≤0.70
409L ≤0.03 ≤1.0 ≤1.0 ≤0.04 ≤0.03 0.5 10.5-11.7 Ti8xC%≤0.70
430 ≤0.12 ≤1.0 ≤1.0 ≤0.04 ≤0.03 16.0-18.0

Chemical Composition of Stainless Steel Nuts

ASTM A194 NUTS Carbon Manganese Phosphorous, max Sulfur, max Silicon Chromium Nickel Molybdenum Other Elements
ASTM A194 grade 2, 2H and 2 HM 0.40% min. 1.00% max. 0.04% 0.05% 0.40% max
ASTM A194 grade 3 0.10% min. 1.00% max. 0.04% 0.03% 1.00% 4.0-6.0% 0.20-0.30%
ASTM A194 grade 4 0.40 -0.50% 0.70-0.90% 0.04% 0.04% 0.15-0.35% 0.20-0.30%
ASTM A194 grade 6 0.15% 1.00% 0.04% 0.03% 1.00% 11.5-13.5%
ASTM A194 grade 6F 0.15% 1.25% 0.06% 0.06% 1.00% 12.0-14.0% Selenium-0.15% min
ASTM A194 grade 7 and 7M (AISI 4140) 0.37-0.49% 0.65-1.10% 0.04% 0.04% 0.15-0.035% 0.75-1.20% 0.15-0.25%
ASTM A194 grade 8 (AISI 304) 0.08% 2.00% max 0.05% 0.03% 1.00% max 18.0-20.0% 8.0-11.0%
ASTM A194 grade 8M (AISI 316) 0.08% 2.00% max 0.05% 0.30% 1.00% max 16.0-18.0% 10.0-14.0% 2.00-3.00%
ASTM A194 grade 8C 0.08% 2.00% 0.05% 0.03% 1.00% 17.0-19.0% 9.0-12.0% Columbium and Tantalum – 10x carbon content, min
ASTM A194 grade 8T 0.80% 2.00% 0.05% 0.30% 1.00% 17.0-19.0% 9.0-12.0% Titanium-0.70%max, Nitrogen-0.10%
ASTM A194 grade 8F 0.15% 2.00% 0.20% 0.15%min 1.00% 17.0-19.0% 8.0-10.0%
ASTM A194 grade 8R 0.06% 4.0-6.0% 0.05% 0.03% 1.00% 20.5-23.5% 11.5-13.5% 1.50-3.00% Columbium and Tantalum-0.10-0.30%, Nirogen-0.20-0.40%, Vanadium-0.10-0.30%
ASTM A194 grade 8S 0.10% 7.0-9.0% 0.06% 0.03% 3.5-4.5% 16.0-18.0% 8.0-9.0% Nitrogen-0.08-0.18%
ASTM A194 grade 16 0.36-0.47% 0.45-0.70% 0.04% 0.40% 0.15-0.35% 0.80-1.15% 0.50-0.65%

Frequently Used ASTM Grades

Material Pipes Fttg Flg Valves Bolts and Nuts
Carbon Steel A106 Gr A A234 Gr WPA A105 A216 Gr WCB A193 Gr B7
A194 Gr 2H
A106 Gr B A234 Gr WPB A105 A216 Gr WCB
A106 Gr C A234 Gr WPC A105 A216 Gr WCB
Carbon Steel
A335 Gr P1 A234 Gr WP1 A182 Gr F1 A217 Gr WC1 A193 Gr B7
A194 Gr 2H
A335 Gr P11 A234 Gr WP11 A182 Gr F11 A217 Gr WC6
A335 Gr P12 A234 Gr WP12 A182 Gr F12 A217 Gr WC6
A335 Gr P22 A234 Gr WP22 A182 Gr F22 A217 Gr WC9
A335 Gr P5 A234 Gr WP5 A182 Gr F5 A217 Gr C5
A335 Gr P9 A234 Gr WP9 A182 Gr F9 A217 Gr C12
Carbon Steel
A333 Gr 6 A420 Gr WPL6 A350 Gr LF2 A352 Gr LCB A320 Gr L7
A194 Gr 7
A333 Gr 3 A420 Gr WPL3 A350 Gr LF3 A352 Gr LC3
A312 Gr TP304 A403 Gr WP304 A182 Gr F304 A182 Gr F304 A193 Gr B8
A194 Gr 8
A312 Gr TP316 A403 Gr WP316 A182 Gr F316 A182 Gr F316
A312 Gr TP321 A403 Gr WP321 A182 Gr F321 A182 Gr F321
A312 Gr TP347 A403 Gr WP347 A182 Gr F347 A182 Gr F347
Material Pipes Fttg Flg Valves Bolts and Nuts

What are the Various Grades of Stainless Steel, Metallica Deals in?

As one of the biggest stainless steel suppliers in India, we stock and supply all major grades of stainless steel.
Austenitic Stainless Steels
301 High strength for roll formed structural components
304, 304L, 304H Standard 18/8 grades
310, 310S, 310H High temperature resistant grades
316, 316L, 316H Improved resistance to pitting corrosion in chloride environments
321, 321H, 347 Stabilized grades for heavy section welding and high temperature applications
904L High resistance to general corrosion, pitting and stress corrosion cracking
Ferritic Stainless Steels
409 Automotive exhaust grade – weld stabilized
430, 430F Resistant to mildly corrosive environments
439 Resistant to mildly corrosive environments – weld stabilized
444 A ferritic alternative to grade 316 / 316L – weld stabilized
Duplex Stainless Steels
2101 Lean duplex – economical alternative to 304 and 316
2304 Duplex alternative to grade 316
2205 Standard duplex stainless steel – high resistance to pitting and stress corrosion
2507 Super duplex with very high resistance to pitting and stress corrosion
Martensitic Stainless Steels
410 Standard martensitic grade for low-duty hardened applications
416 Free-machining bar grade
420 Higher hardness martensitic grade for cutlery, cutting tools and dies
431 High hardness and toughness grade, primarily for shafting
440A, 440B, 440C Very high hardness grades used in cutting tools
Precipitation Hardening Stainless Steel
630 (17-4PH) High strength shafting grade

What are the Maximum Operating Temperatures of Stainless Steel Grades?

Stainless steels have good strength and good resistance to corrosion and oxidation at elevated temperatures. Stainless steels are used at temperatures up to 1700° F for 304 and 316 and up to 2000 F for the high temperature stainless grade 309(S) and up to 2100° F for 310(S).

Maximum Operating Temperatures of Stainless Steel Grades

[Image Source: From Web]

What is the Impact of Various Alloying Elements on the Properties of Stainless Steel?

Element Effect on Stainless Steel
Chromium Forms a passive film with oxygen that prevent the further diffusion of oxygen into the surface
Composition needs to contain at least 10.5% to be a stainless steel
Nickel Increases ductility and toughness. Increase corrosion resistance to acids
Additon creates non-magnetic structure
Molybdenum Increases pitting and crevice corrosin resistance. Increase resistance to chlorides
Copper Increase corrosion resistance to sulfuric acid
Manganese Substitute for nickel (200 series)
Titanium/Niobium Ties up carbon and prevents inter-granular corrosion in welded zone of ferritic grades
Nitrogen Increase strength and corrosion resistance in austenitic and duplex grades
Silicon Improves resistance to high temperature scaling
Sulfur Usually kept low excet for “free-machining” grades
Carbon Usually kept low.  Used in martensitic grades to increase strength and hardness

What are the Steel Pipe Sizes?

Steel pipe sizes

Pipe size is quoted as a “Nominal Pipe Size” or NPS. The origin of the NPS numbers for smaller pipes (< NPS 12) is different to the origin for larger diameter pipes. However, all pipes of a specific NPS number have the same external or outer diameter (OD). The internal diameter will vary depending on the wall thickness of the metal. The reason for this is so that the same structural supports can be used for all piping of a specific NPS number regardless of the wall thickness.


Steel pipe schedules are a way to describe the wall thickness of the pipe. This is a critical parameter as it is directly related to the strength of the pipe and the suitability for specific applications. A pipe schedule is a dimensionless number and is calculated based on the design formula for wall thickness, given the design pressure and allowable stress.

Examples of schedule numbers are as follows: 5, 5S, 10, 20, 30, 40, 50, 60, 80, 100, 120, 140, 160, STD, XS, and XXS—with the most common being schedules 40 and 80. As the schedule number increases, the wall thickness of the pipe increases. The schedule number of a pipe therefore defines the internal diameter, as the OD is fixed by the NPS number.

Over 10000 Tons in Stock for Stainless Steel Nuts and Bolts!

ISMT & Jindal Steel Pipes Dealers, Original MTR's Provided with All Materials

As one of the biggest stainless steel nuts and bolts stockholder and supplier in India, Metallica carries inventory of over 10,000 tons in its warehouses in Mumbai, Maharashtra India. We sell our stainless steel forged products throughout India, and to international clients. We can supply our stainless steel nuts and bolts not only in industry-standard lengths and diameters, but also in custom length and diameters.

How are Steel Pipes Certified?

Certification of Steel Pipes

Manufacturers issue a Material Test Report or Mill Test Report to validate that the product meets the chemical analysis and mechanical properties specification. The MTR will contain all relevant data to the product and will accompany the product through its lifecycle.

The following are typical parameters that may be recorded on an MTR:

  • Chemical composition including carbon content, alloys, and sulfur
  • Material size, weight, identification, and grade
  • Material heat number, which ties back to the processing batch
  • Mechanical properties like tensile strength, yield strength, and elongation

At Metallica, we will Provide you with Original MTR’s for all Stainless Steel Pipe Products! We will Send Our Test Certificates, along with Quotation