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41L40 Leaded Alloy Steel Round Bar

41L40 Leaded Alloy Steel Round Bar: 41L40 is a lead-bearing chromium-molybdenum alloy steel related to 4140 but modified for machining. It is a separate alloy designation with lead-compliance implications.

Download Mozaic 41L40 Leaded Alloy Steel Round Bar technical reference sheet (PDF)

41L40 Leaded Alloy Steel Round Bar — Grade and Specifications

Identification, product standards and ordering information
Requirement Technical / purchase-order detail
Material / product 41L40 Leaded Alloy Steel Round Bar
Alloy or grade identity SAE/AISI 41L40 leaded Cr-Mo steel
Applicable purchasing standard Verify heat chemistry and applicable bar standard
Supply condition Hot-rolled or cold-drawn condition, final strength and finish as ordered
Typical uses Machined pins, shafts, fittings and mechanical components
Dimensional processing Define diameter, finish, tolerance, bar straightness and cutting requirements separately

This reference page does not constitute a mill test report or a guarantee of available stock. Mechanical properties, chemistry and certifications depend on the actual ordered alloy, condition and product standard.

Applications and Grade-Selection Guidance

Ordinary 4140 and 41L40 should not be treated as interchangeable where lead content or machinability matters. Representative applications include machined pins, shafts, fittings and mechanical components. Product purchasing should identify the alloy family or exact UNS designation and the conditions of service. Grade substitutions require engineering approval; a similar grade name does not demonstrate equivalent performance.

Round Bar Processing and Precision Finishing

Mozaic Precision Metals offers order-specific centerless grinding, straightening, saw cutting, polishing, chamfering and packaging. Buyers should specify finished outside diameter, diameter tolerance, length, surface finish, material condition, inspection and lot traceability independently. Actual grinding capability depends on the bar dimensions, alloy and heat-treatment state.

Related Grades and Material Guides

Request Material Sourcing or Grinding

Send your grade/product drawing, material standard, supplied condition, starting/finished sizes, tolerance, quantity and certifications to sales@mozaicprecision.com, call 847-637-8379 or request a quotation.

Best 41L40 Steel Round Bar Supplier

When choosing the right alloy steel for your industrial applications, 41L40 round bar and 41L42 round bar are proven options for strength, toughness, and wear resistance. Finding a trusted supplier is critical to ensure consistent quality, reliable performance, and value for your investment.

Why Choose Mozaic Precision Metals for 41L40 & 41L42 Steel?

  • High-Quality Materials – Mozaic Precision Metals sources from leading mills to ensure every round bar meets strict industry standards.
  • Custom Sizes & Finishes – Precision cutting, grinding, and chamfering services provide bar stock tailored to your requirements.
  • Fast Turnaround – Standard and custom orders are processed quickly to keep your projects on schedule.
  • Competitive Pricing – Offering premium alloy steels at cost-effective prices for maximum value.
  • Technical Expertise – Our team provides expert support to help you select the right alloy for your specific application.

 

What is 41L42 Steel?

41L42 steel is a low-carbon chromium-molybdenum alloy steel known for its high strength, toughness, and wear resistance. Its typical composition includes:

  • Carbon (C): ~0.40%
  • Chromium (Cr): 0.90 – 1.20%
  • Molybdenum (Mo): 0.15 – 0.25%
  • Manganese (Mn): 0.75 – 1.00%

The combination of chromium and molybdenum provides excellent hardness penetration, uniform strength, and good machinability, especially in heat-treated conditions.

Applications of 41L42 Steel

  • Gears & Shafts – High strength and wear resistance make it ideal for precision drivetrain components.
  • Machine Parts – Used for fasteners, screws, bolts, and nuts requiring toughness and durability.
  • Automotive & Aerospace – Applied in crankshafts, axles, and landing gear for heavy-duty performance.
  • Oil & Gas Industry – Commonly used for drill collars, subs, and critical downhole components.

Applications of 41L40 Steel

41L40 round bar shares many of the same properties as 41L42, offering excellent strength, toughness, and wear resistance. It is widely used in:

  • Automotive & Transportation – Gears, crankshafts, axles, and components for heavy vehicles.
  • Oil & Gas – Drill collars, subs, and shafts for harsh drilling environments.
  • Aerospace – Landing gears, engine parts, and other high-stress aircraft components.
  • Construction Equipment – Cranes, excavators, and other machinery for heavy load handling.
  • Tool & Die Industry – Cutting tools, molds, and dies requiring hardness and wear resistance.

Partner with Mozaic Precision Metals

At Mozaic Precision Metals, we supply premium 41L40 and 41L42 alloy steel round bar with precision services including grinding, polishing, cutting, and chamfering. Whether your project involves automotive, aerospace, oil & gas, or heavy equipment manufacturing, we deliver alloy steels engineered for strength, reliability, and performance.

Contact Mozaic Precision Metals today to request a custom quote for 41L40 or 41L42 steel bar stock and experience the difference of working with a trusted supplier.