Unifit Metalloys Inc is one of the trusted names when it comes to supplying Alloy Steel ASTM A193 Grade B7M Fasteners especially for use in nitric acid environments. What sets these fasteners apart is the careful control over elements like carbon silicon and phosphorus. That tight control helps create a stable austenite structure without unwanted carbide or intermetallic buildup so the fasteners stay reliable and clean even under harsh conditions.
Note that ASTM A193 Grade B7M Bolts aren’t suitable for use with concentrated nitric acid that contains CrVI. Outside of that specific case B7M fasteners like nuts, screws and bolts perform well in a wide range of applications thanks to their good ductility and weldability.
When it comes to B7M washers the pickling process is usually done by dipping, spraying or applying pickling paste depending on the setup. There’s also been testing with high velocity oxy fuel coatings and the results showed that ASTM A193 Grade B7M Hex Head Bolts handled wear much better under high temperatures.
Request QuoteWhat is ASTM A193 Grade B7M?
ASTM A193 B7M is a high-grade alloy steel fastener made for jobs where both heat and pressure are pushing the limits. It’s built to resist corrosion stress and thermal expansion which makes it a solid choice for harsh environments especially those with high temperatures or chemicals like nitric acid. When the conditions are tough B7M holds up without breaking down. Another reason ASTM A193 B7M stands out is because it’s easier to weld and offers better ductility. That makes it more dependable when things get extreme. If you compare it to ASTM A193 B7 you’ll find that while B7 is strong and holds up well it doesn’t offer the same level of corrosion resistance or thermal stability. So in environments where there’s a lot of heat or chemical exposure B7M usually does a better job.
Send Your Enquiry
Types of ASTM A193 B7M Fasteners
ASTM A193 B7M fasteners come in all sorts of types because not every job needs the same thing. What they all have in common is they’re made to handle heat, pressure, and tough environments without giving up. Whether you need bolts, screws, or stud bolts, these fasteners are built to stay strong and keep things in place when it really matters. If you’re working somewhere that puts your materials to the test, there’s probably a B7M fastener that’s up for it. Here’s a quick breakdown of the different types available so you can figure out what fits your job best.
- ASTM A193 B7M Structural Bolts
- ASTM A193 B7M Heavy Hex Bolts
- ASTM A193 B7M Hex Bolts
- ASTM A193 B7M Hexagon Head Bolts
- ASTM A193 B7M Machine Bolts
- ASTM A193 Grade B7M T Bolts
- ASTM A193 Gr. B7M Eye Bolt
- ASTM A193 B7M Foundation Bolts
- Alloy Steel A193 Gr B7M J Bolts
- ASTM A193 B7M Button Head Bolt
- ASTM A193 B7M Anchor Bolts
- ASTM A193 B7M Long Bolts
- ASTM A193 B7M Carriage Bolt
- ASTM A193 B7M Elevator Bolt
- ASTM A193 B7M Timber Bolts
- ASTM A193 B7M Square Bolt
- ASTM A193 B7M Metric Bolt
- ASTM A193 B7M Plow Bolts
- Alloy Steel Gr. B7M U Bolts
- ASTM A193 B7M Flange Bolts
- ASTM A193 B7M Socket Set Screw
- ASTM A193 B7M Self Drilling Screw
- ASTM A193 B7M Socket Head Cap Screw
- ASTM A193 B7M Hex Head Screws
- ASTM A193 B7M Wood Screw
- ASTM A193 Gr. B7M Eye Screw
- ASTM A193 Gr. B7M Wing Screw
- ASTM A193 B7M Self Tapping Screws
- ASTM A193 Gr. B7M Roofing Screw
- ASTM A193 B7M Phillips Head Screw
- ASTM A193 B7M Decking Screw
- ASTM A193 B7M Machine Screw
- ASTM A193 B7M Thumb Screw
- ASTM A193 B7M Drywall Screws
- ASTM A193 B7M Chipboard Screw
- ASTM A193 B7M Metric Set Screws
- Alloy Steel B7M Sems Screw
- ASTM A193 B7M Thread Rolling Screw
- ASTM A193 B7M Full Threaded Stud Bolts
- ASTM A193 B7M Half Threaded Stud Bolts
- Alloy Steel ASTM A193 B7M Threaded Rod
- ASTM A193 B7M Double Ended Studs
- ASTM A193 B7M Tap End Stud Bolt
- Alloy Steel ASTM A193 B7M Tie Rods
- Alloy Steel A193 Grade B7M Studs
- ASTM A193 B7M Single End Stud Bolts
- A193 Gr.B7M Reduced Shank Stud Bolt
- A193 B7M Continuous Threaded Stud Bolt
- A193 B7M Partial Threads Stud Bolt
- SA193 / A193 B7M Heavy Stud Bolts
These versatile SA A193 Gr B7M fasteners ensure optimal performance and safety in high-stress, high-temperature applications across various industries.
ASTM 193 B7M Bolt Fasteners Specifications
The specifications for Bolt B7M typically include:
| Specification | Details |
|---|---|
| Size | Ranges from 3mm to 200mm |
| Thread Size | M3 – M56 |
| Length | Available in custom lengths based on specific application requirements |
| Material | Made from strong chromium molybdenum alloy steel that’s heat treated for enhanced toughness, allowing it to withstand stress, heat, and harsh conditions. |
ASTM 193 B7M Stud Fasteners Specifications
B7M stud fasteners are built for the kind of conditions that push equipment to the edge — high heat, heavy loads, and tough environments. They're made to hold tight and stay reliable when failure just isn't an option.
| Specification | Details |
|---|---|
| Material | Tough ASTM A193 Grade B7M alloy steel |
| Size Range | M6 to M64 (custom sizes available upon request) |
| Tensile Strength | Approx. 690 MPa — capable of withstanding high stress |
| Corrosion Resistance | Resistant to rust, oxidation, and pitting — ideal for harsh or corrosive environments |
| Used In | Petrochemical plants, power stations, offshore rigs, and heavy engineering projects |
If you’re working in places where the environment doesn’t go easy on your equipment, these are the fasteners you want — no fuss, no failures, just solid performance.
ASTM A193 B7M Chemical Composition
The chemical composition of ASTM A193 B7M fasteners ensures their enhanced durability and resistance to extreme conditions. Here’s a breakdown of the key elements:
| Element | Range |
|---|---|
| Carbon (C) | 0.37 - 0.49% |
| Manganese (Mn) | 0.65 - 1.10% |
| Phosphorus (P) | 0.035% max |
| Sulfur (S) | 0.040% max |
| Silicon (Si) | 0.15 - 0.35% |
| Chromium (Cr) | 0.75 - 1.20% |
| Molybdenum (Mo) | 0.15 - 0.25% |
These elements allow ASTM A193 B7M fasteners to perform reliably even in environments with high heat and exposure to corrosive substances.
ASTM A193 Grade B7M Raw Material
Below is a table showing the key raw material specifications used to manufacture ASTM A193 Grade B7M fasteners:
| Grade | Raw Material Description |
|---|---|
| ASTM A193 B7M | Chromium Molybdenum Alloy Steel, Quenched & Tempered |
ASTM A193 Grade B7M Material Specification for Fasteners
| Specification | Details |
|---|---|
| Specifications | ASTM A193 / ASME SA193 |
| Length | 3mm to 200mm |
| Size | 3/6″ to 2″, M3 – M56, Custom Sizes |
ASTM A193 Grade B7M Material Properties of Fasteners
The material properties of ASTM A193 B7M fasteners ensure exceptional strength, durability, and resistance in demanding applications:
| Material Properties | Value |
|---|---|
| Tensile Strength | 690 MPa (for diameters up to 100mm) |
| Yield Strength | 550 MPa (for diameters up to 100mm) |
| Elongation | 18% |
| Hardness | 235 HBW or 99 HRB |
These properties make ASTM A193 B7M fasteners highly reliable for use in challenging and high-temperature conditions.
ASTM A193 Grade B7M Fasteners Standards
The ASTM A193 Grade B7M fasteners are produced in compliance with rigorous industry standards. Below is a comprehensive list of all the relevant B7M standards:
| Hexagon Bolt / Set Screws | Stud Bolt | Hexagon Nuts | Socket Cap screws |
|---|---|---|---|
| DIN 931 | BS4882 | DIN 934 | DIN 912 |
| DIN 933 | DIN 976 | BS 1768 | DIN 6912 |
| BS 1768 | BS 1769 | DIN 7984 | |
| UNI 5731 | BS 1083 | ANSI B18.3 | |
| UNI 5739 | BS 3692 | ISO 4762 | |
| ISO 4014 | ISO 4032 | UNI 5931 | |
| ISO 4017 | ISO 4033 | BS 2470 | |
| BS 1769 | ANSI B18.2.2 | BS 4168 | |
| BS 3692 | |||
| ANSI B18.2.1 |
| Socket & Slotted Set Screws | Socket & Slotted Countersunk Screws | Studs | Washers |
|---|---|---|---|
| DIN 913 | DIN 963 | DIN 938 | DIN 125 |
| DIN 914 | DIN 7991 | DIN 939 | DIN 9021 |
Key Differences Between ASTM A193 B7, B7M & B8M Fasteners
- When it comes to B7, B7M, and B8M fasteners, the main thing to know is this — they might look alike, but they’re not made for the same kind of work. It really depends on what kind of environment you're putting them in.
B7 vs B7M - What’s the Difference?
- B7 is your everyday strong, dependable fastener. It’s made for high-pressure jobs — stuff like pipelines or heavy structural setups. If the environment’s not too harsh — no heavy chemicals or constant exposure to heat — B7 will hold up just fine.
- B7M, though, is built for rougher conditions. It’s got a slightly different mix of materials that helps it fight off corrosion and heat a lot better. So if you’re working in a place like a chemical plant or somewhere offshore — basically anywhere metal tends to get eaten up over time — B7M is the better bet. It lasts longer and gives you fewer headaches in the long run.
Difference Between B7 and B8M
B7M and B8M fasteners might sound similar, but they’re built for different kinds of work.
- B8M is made from stainless steel, so it’s a solid choice if you’re dealing with rust, saltwater, or chemicals. If the environment’s tough on metal — like in marine or chemical setups — B8M is usually your best bet. It holds up without corroding or breaking down over time.
- B7M can handle a bit of that too, but where it really shines is in high-heat situations. If things get seriously hot and you still need the fastener to stay strong under pressure, B7M is the one you want. It’s built for heat and heavy loads more than harsh chemicals.
Applications of ASTM A193M Grade B7 Fasteners
Our ASTM A193 B7M fasteners are built to handle tough conditions and are trusted across a wide range of industries. You’ll commonly find them used in sectors like:
- Heavy Engineering Industries
- Petro-Chemical Industries
- Shipbuilding Industries
- Fertilizer Plants
- Civil Construction Industries
- Power Generation Units (Nuclear, Hydro, or Thermal)
- Civil Industries
- Oil Expansion Projects
- Offshore & Onshore Oil Towers
- Valves
- Vessels
- Home Fittings
- Pumps
- Railways
- Steel Plants
ASTM A193 Grade B7M Price in India for Fasteners
At Unifit Metalloys, we know you need fasteners that don’t quit. Our B7M fasteners are made to handle heat, pressure, and rough conditions without giving up. No fancy talk — they just work.
We’ve got good prices and we work with people in all kinds of tough industries — petrochemical, power plants, shipbuilding, heavy stuff. If you need something specific, we’ll figure it out. Custom sizes, special requests — we’ve done it all.
Need a quote? Just reach out. We’ll get back to you quickly.
Request Quote