4140
4140 Alloy Steel FastenersAlloy 4140 is widely used for industrial fasteners due to its high fatigue resistance, toughness, and torsion resistance. Valley Fastener Group has manufactured 4140 alloy fasteners for over 40 years, providing the quality that OEMs need for automobiles, farming equipment, and heavy machinery. Options include standard heads and specialized styles such as indented hex, button, pan, truss, modified truss, fillister, and SEMs.
Why Choose Alloy 4140 for Manufacturing and Construction
Manufacturers choose alloy 4140 for its outstanding torsional strength. This makes it a perfect fit for axles, suspension parts, motors, and other driveshaft components. Steel alloy 4140 also offers high impact resistance, abrasion resistance, hardness, and corrosion resistance.
Fasteners made with alloy 4140 deliver long-lasting performance and stand up exceptionally well to fatigue and mechanical stresses. In the construction industry, 4140 screws and bolts are used in building structures and heavy machinery, such as loaders, cranes, bulldozers, and backhoes.
Forming and Welding Information
Grade 4140 steel alloy is highly ductile, but it’s more difficult to machine than low-carbon steel alloys. It can be annealed to improve formability, but we use cold-forming for precise dimensional tolerances.
To maximize hardness and wear resistance, this alloy frequently undergoes heat treatment. For 4140 rivets and weld studs, fasteners need to be installed before performing a post-weld heat treatment.
Alloy 4140 Fastener Specifications
Steel alloy 4140 gets its incredible hardness, torsion resistance, toughness, and fatigue strength from the addition of chromium (0.8% to 1.1%), manganese (0.75% to 1%), and molybdenum (0.15% to 0.25%). The carbon content is between 0.38% and 0.43%, making 4140 a medium-carbon alloy. This composition enhances the material’s versatility across many industries.
Alloy 4140 fasteners have a maximum rating of:
- Tensile strength: 95,000 psi
- Yield strength: 60,200 psi
- Brinell hardness: 197
- Rockwell hardness: 92
- Elongation at break: 25.7%
Our in-house engineering and testing facilities ensure rigorous quality compliance, both for standard fasteners and custom alloy 4140 fasteners.
Industrial Applications for 4140 Alloy Steel Screws, Bolts, and Rivets
Ally 4140 fasteners, such as self-threading screws and special machine screws, play an important role in nearly every industry:
- Oil and gas
- Automotive and heavy equipment manufacturing
- Mining
- Agricultural
- Aerospace and defense
- Transportation
Consumer goods manufacturers use 4140 fasteners for power tools, cutting tools, and sports/gym equipment.
A Trusted 4140 Fastener Supplier
The name Valley Fastener Group is synonymous with quality, durability, and precise manufacturing. Request a quote for standard or custom 4140 alloy steel fasteners right away.
