Unifit Metalloys Inc is known for making and exporting AISI 4140 fasteners also known as UNS G41400 that are built to handle tough jobs. These fasteners are made from chromium molybdenum alloy steel which means they’re strong heat treatable, easy to machine and ready to last. They’re designed for high stress environments where strength, toughness and wear resistance really matter. We offer a full range including AISI 4140 hex bolts, nut, washers, screws and stud bolts all made to meet global standards like ASTM DIN and ISO.
You’ll find these fasteners used across industries like aerospace automotive oil and gas petrochemical and heavy engineering. They’re built to perform even in harsh environments like those with boiling nitric acid between 50 to 65 percent thanks to their carefully controlled silicon and carbon levels. Our 4140 fasteners can also handle heat really well with resistance to scaling up to 1050°C. That makes them a solid choice for equipment like heat exchangers pumps, tanks, coolers and pipelines where strength and long term reliability really count.
Request QuoteWhat is AISI 4140?
AISI 4140 isn’t just another alloy steel - it’s the kind people reach for when strength really matters. It’s a mix of chromium and molybdenum which gives it that extra edge in toughness and wear resistance. Some know it as UNS G41400 but most just know it works. It machines pretty well holds up under stress and doesn’t quit when things get rough. That’s why you see it used everywhere in cars, planes, oil rigs and big industrial machines.
Now when you’re talking fasteners AISI 4140 really proves its worth. It can be heat treated to get the right level of hardness depending on what you need. And it doesn’t just handle pressure once - it keeps going through repeated loads without breaking down. Whether it’s bolts, nuts, washers or screws these fasteners don’t just fit in - they hold everything together when it matters most. Heat vibration pressure as they’re built for all of it.
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Types of AISI 4140 Fasteners
At Unifit Metalloys Inc we make and supply a wide range of AISI 4140 fasteners built to handle some of the toughest jobs out there. These fasteners are designed for strength and wear resistance so they hold up well even in demanding industrial environments. Below you’ll find the different types of AISI 4140 fasteners we manufacture to meet your specific needs.
- AISI 4140 Structural Bolts
- AISI 4140 Heavy Hex Bolts
- AISI 4140 Hex Bolts
- AISI 4140 Hexagon Head Bolts
- AISI 4140 Machine Bolts
- Alloy Steel AISI 4140 T Bolts
- Alloy Steel Grade 4140 Eye Bolt
- AISI 4140 Foundation Bolts
- Alloy Steel 4140 J Bolts
- AISI 4140 Button Head Bolt
- AISI 4140 Anchor Bolts
- AISI 4140 Long Bolts
- AISI 4140 Carriage Bolt
- AISI 4140 Elevator Bolt
- AISI 4140 Timber Bolts
- AISI 4140 Square Bolt
- AISI 4140 Metric Bolt
- AISI 4140 Plow Bolts
- Alloy Steel 4140 U Bolts
- AISI 4140 Flange Bolts
- AISI 4140 Hex Nuts
- AISI 4140 Heavy Hex Nuts
- AISI 4140 Wing Nuts
- AISI 4140 Hexagon Nuts
- AISI 4140 Cap Nuts
- AISI 4140 Square Nuts
- AISI 4140 Coupling Nuts
- AISI 4140 Hex Jam Nuts
- Alloy Steel Gr 4140 T-Nuts
- AISI Grade 4140 Eye Nuts
- AISI 4140 Nylock Nuts
- Alloy Steel 4140 High Tensile Nuts
- AISI 4140 Cage Nuts
- AISI 4140 Dome Nuts
- AISI 4140 Knurled Nuts
- AISI 4140 Keps-K Lock Nuts
- AISI 4140 Machine Hex Nuts
- AISI GR 4140 Slotted Nuts
- AISI 4140 Plain Washers
- AISI 4140 Spring Washers
- AISI 4140 Locking Washer
- AISI 4140 Split Washer
- Alloy Steel Gr 4140 Flat Washers
- AISI 4140 Ogee Washers
- AISI 4140 Fender Washer
- AISI 4140 Conical Washers
- AISI 4140 Serrated Washer
- AISI 4140 Tab Washers
- AISI 4140 Hex Washer
- AISI 4140 Countersunk Washer
- Alloy Steel 4140 Dock Washers
- AISI GR.4140 Spring Lock Washer
- AISI 4140 Star Washer
- AISI 4140 Bonded sealing Washer
- AISI 4140 Square Washers
- AISI GR 4140 Belleville Washer
- AISI 4140 Socket Set Screw
- AISI 4140 Self Drilling Screw
- AISI 4140 Socket Head Cap Screw
- AISI 4140 Hex Head Screws
- AISI 4140 Wood Screw
- Alloy Steel 4140 Eye Screw
- AISI 4140 Wing Screw
- AISI 4140 Self Tapping Screws
- AISI 4140 Roofing Screw
- AISI 4140 Phillips Head Screw
- AISI 4140 Decking Screw
- AISI 4140 Machine Screw
- AISI 4140 Thumb Screw
- AISI 4140 Drywall Screws
- AISI 4140 Chipboard Screw
- AISI 4140 Metric Set Screws
- AISI 4140 Sems Screw
- AISI 4140 Thread Rolling Screw
- AISI 4140 Full Threaded Stud Bolts
- AISI 4140 Half Threaded Stud Bolts
- Alloy Steel 4140 Threaded Rod
- AISI 4140 Double Ended Studs
- AISI 4140 Tap End Stud Bolt
- Alloy Steel 4140 Tie Rods
- Alloy Steel Grade 4140 Studs
- AISI 4140 Single End Stud Bolts
- AISI 4140 Reduced Shank Stud Bolt
- AISI 4140 Continuous Threaded Stud
- AISI 4140 Partial Threads Stud Bolt
- Alloy Steel AISI 4140 Heavy Stud Bolts
Whether you need standard components or custom-built 4140 fasteners, we ensure quality, precision and timely delivery to meet your specific application needs.
AISI 4140 Chemical Composition (SAE 4140)
To really understand why AISI 4140 performs the way it does you’ve got to look at its chemical makeup. It’s the balance of elements that gives it that solid mix of strength, toughness and wear resistance. That’s exactly what makes it such a good fit for fasteners especially in heavy duty applications.
| Material | Percentage (%) |
|---|---|
| Carbon (C) | 0.38 – 0.43 |
| Manganese (Mn) | 0.75 – 1.00 |
| Chromium (Cr) | 0.80 – 1.10 |
| Molybdenum (Mo) | 0.15 – 0.25 |
| Silicon (Si) | 0.15 – 0.35 |
| Sulfur (S) | ≤ 0.040 |
| Phosphorus (P) | ≤ 0.035 |
| Iron (Fe) | 96.785 – 97.77 |
The way these elements are balanced in AISI 4140 or SAE 4140 steel really boosts its performance when things get intense. That’s why fasteners made from it tend to last long and stay reliable even in industries where the situation is always demanding.
AISI 4140 Material Equivalent Grades for Fasteners
AISI 4140 is known around the world for its solid mix of strength, toughness and fatigue resistance. Since it’s used across so many industries and countries you’ll find it listed under different standards and material codes. That makes it easier to match and use globally especially when sourcing fasteners. Here are some of the most common AISI 4140 material equivalents used in fastener manufacturing:
| AISI | UNS | WERKSTOFF NR. |
|---|---|---|
| Grade 4140 | G41400 | 1.7225 |
AISI 4140 Material Specification for Fasteners
| Specification | Details |
|---|---|
| Specifications | ASTM A193 / ASME SA193 |
| Length | 3mm to 200mm |
| Size | 3/6″ to 2″, M3 – M56, Custom Sizes |
AISI 4140 Material Properties
AISI 4140 stands out because of its strong mechanical properties which make it a go to material for fasteners in high load and high pressure jobs. It handles stress and fatigue really well so it stays reliable even when conditions get tough. Below you’ll find a full breakdown of AISI 4140 material properties that show why it’s trusted in critical applications:
| Material Properties | Value |
|---|---|
| Tensile Strength | 655 MPa |
| Yield Strength | 415 MPa |
| Elongation | 25.70% |
| Hardness (Brinell) | 197 |
| Density | 7.85 g/cm³ |
| Modulus of Elasticity | 205 GPa |
| Impact Toughness (Charpy) | Good |
These properties contribute directly to the fastener's ability to maintain integrity under pressure, making AISI 4140 a reliable choice for automotive, oil & gas and aerospace fastening systems.
Key AISI 4140 Steel Properties
AISI 4140 steel is one of those materials people count on when things get tough. It’s strong, dependable and built to take a beating which is why it’s a popular choice for fasteners used in demanding environments. Whether it’s heavy machinery, aerospace or oil and gas work these fasteners are made to hold up when it matters most.
Here’s what makes AISI 4140 fasteners stand out:
- They’ve got the strength to handle serious loads without giving in.
- Stay tough even when the temperature drops.
- They don’t wear out easily under repeated stress which means they last longer.
- You can machine or heat treat them depending on what your job needs.
- They hold up well against wear and rough use especially in industrial settings
Because of all this AISI 4140 fasteners are trusted in places where failure just isn’t an option. If you need reliability under pressure these fasteners are the kind of hardware you want on the job.
Applications of AISI 4140 Fasteners
People trust AISI 4140 fasteners because they’re strong and they don’t quit under pressure. You’ll find them in jobs where there’s no room for failure and the kind of work that needs parts to hold up day after day. They’ve got the toughness and performance to handle rough conditions and heavy use. That’s why they’re often used where fatigue resistance and long term durability really matter.
These fasteners show up in all kinds of industries like:
- Civil Construction Industries
- Ship Building Industries
- Heavy Engineering Industries
- Fertilizer Plants
- Power Generation Units (Nuclear, Hydro, or Thermal)
- Petro-Chemical Industries
- Oil Expansion Projects
- Offshore & Onshore Oil Towers
- Home Fittings
- Valves, Vessels, and Pumps
- Railways
- Steel Plants
These fasteners are essential in ensuring high performance and reliability across a wide range of critical industries and applications.
AISI 4140 Price in India for Fasteners
Need AISI 4140 fasteners that actually meet top industry standards? You’re in the right place. We offer a wide selection of fasteners made to ASTM DIN & ISO specs and we keep our AISI 4140 prices in India fair and competitive. Whether you’re in automotive aerospace oil and gas or heavy engineering these fasteners are built to give you strength, durability and solid performance where it counts.
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