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

9840 Round Steel Bar

A medium-carbon alloy used for quenched-and-tempered components requiring strength, toughness, and through-hardening response.

Purchase to your specification

9840 for production and repeat supply.

Buying 9840 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 9840 material profile ↓

Quote Desk

Your 9840 requirement

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Material / Grade

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

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9840 Round Bar: Material Profile

9840 is used for loaded parts that need deeper hardening than plain-carbon grades can provide.

Availability can depend on diameter and condition, so include the mechanical properties, heat treatment, testing, quantity, and delivery date.

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

Good through-hardening
High strength potential
Good toughness
Good wear and fatigue resistance

Common Applications

Shafts and axles
Gears and couplings
Forged machinery parts
Heavy-equipment 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.