Commercial Production · Alloy Steel · Nickel-Molybdenum Alloy Steel Bar

4820 Round Steel Bar

A nickel-molybdenum case-hardening alloy used for tough gears, shafts, and power-transmission parts.

Purchase to your specification

4820 for production and repeat supply.

Buying 4820 for machining, forging, or component production? Send your dimensions, condition, and quantity per order. For repeat supply, include annual usage and release timing, or attach your existing RFQ.

Size & supply condition: State the diameter, length, and required condition. We confirm the available supply route against your order.
Finished to your requirement: Include production cutting, surface finish, tolerances, and any required heat treatment. Processing is reviewed with the material requirement.
Documentation & delivery: Specify mill certifications, testing, traceability, delivery date, and ship-to location so they can be included in the quote.

A grade name is the starting point. The governing specification, condition, dimensions, and testing define the material to be quoted.

Read the 4820 material profile ↓

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Your 4820 requirement

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Quantity / WeightCommercial requirements from 3,000 lb through truckload quantities.

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4820 Round Bar: Material Profile

4820 combines a carburizable carbon level with substantial nickel for core toughness in highly loaded components.

Purchasing requirements should define section size, quality restrictions, case and core properties, and the heat-treated condition.

Purchase to the controlling ASTM, SAE, AMS, or customer specification. Section size, supply condition, mechanical properties, surface limits, testing, and heat/lot traceability can change the acceptable material and processing route.

Key Characteristics

Excellent toughness
Good carburizing response
Good fatigue resistance
Strong shock-load performance

Common Applications

Heavy-duty gears
Drive shafts and pinions
Aircraft power-transmission parts
Case-hardened industrial components

Specification Requirements

Identify the governing specification and revision, product form, section size, condition, mechanical properties, testing, and certification requirements. The purchase specification and material certification govern the order.