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4340

4340

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4340 Product Guide

| 4340 Alloy Steel Tolerance Guide

Alloy Steel 4340 steel has high strength, toughness, wear resistance, and fatigue strength. It can be machined in all states other than hardened and it is easily welded. Additionally, 4340 can be cold worked easily in the annealed state. This material is typically used in military aircraft, automotive systems, hydraulic parts, machine tools, and a steel crankshafts.

We carry 4330 alloy steel in hex bar, rectangle bar, square bar, round bar & sheet/plate.

NEW! - We offer waterjet services for this product. Learn More | Request Quote >

Relevant Knowledge Hub Resources: 5 Reasons to Cut-to-Size | Understanding Steel

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Temper

Annealed

N&T

Normalized

Normalized & Tempered

Quenched & Tempered

Production Method

Cold Drawn

Cold Finished

Hot Rolled

Hot Rolled Rough Turned

Rough Turned

Secondary Shape

Radius Corner

Unit of Measure

inch

seller

Onlinemetals.com

Material

Alloy Steel

Alloy/Type

4340

Shape

Bar-Hex

Bar-Rectangle

Bar-Round

Bar-Square

Sheet/Plate

%7B%22item_id%22%3A%227415%22%2C%22item_name%22%3A%225.5%5C%22+Alloy+Steel+Round+Bar+4340-Normalized+Rough+Turned%22%2C%22item_brand%22%3A%22%22%2C%22item_category%22%3A%22Alloy+Steel%22%2C%22item_category2%22%3A%22Bar-Round%22%2C%22item_category3%22%3A%224340%22%2C%22item_category4%22%3A%22Normalized%22%2C%22item_category5%22%3A%22Rough+Turned%22%2C%22item_category6%22%3A%22%2F%22%2C%22item_category7%22%3A%22%22%2C%22item_category8%22%3A%22false%22%2C%22item_category9%22%3A%22true%22%2C%22item_list_id%22%3A%22%22%2C%22item_list_name%22%3A%22%22%2C%22item_variant%22%3A%22%22%2C%22price%22%3A%22%22%2C%22quantity%22%3A%22%22%7D

5.5" Alloy Steel Round Bar 4340-Normalized Rough Turned -
Part #: 7415

5.5" Alloy Steel Round Bar 4340-Normalized Rough Turned -

Part #: 7415

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alloy-steel-round-bar-4340-normalized-rough-turned-1superZoom

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Dimensions

Diameter: 5.5"

See all available dimensions for this product

Select a Cut Size for Price Select a Cut Size

12″ (1 ft.) - $733.17 ea.
24″ (2 ft.) - $1,385.80 ea.
36″ (3 ft.) - $2,046.45 ea.
Buy 4 at the 12 ft price!
44″ (44 in.) - $2,442.18 ea.
Order to avoid UPS additional handling fees
48″ (4 ft.) - $2,653.42 ea.
72″ (6 ft.) - $3,657.86 ea.
96″ (8 ft.) - $4,683.77 ea.

Save on shipping!

You can select smaller lengths and switch from freight to standard shipping and save!

How does selecting smaller lengths reduce shipping costs?

Reducing your order from an oversize item that requires expensive freight services to a smaller bundle makes it eligible for less expensive (and faster!) standard shipping services.

*Material tolerances will remain +/- 0.125".

Best shipping value:

Single Heat Lot Required

Why are heat lots important?

Heat lots ensure consistent metal properties, full traceability, and quality control, which are critical for precision and reliability in your projects.

By selecting "Single Heat Lot Required" option, we ensure all cut pieces are sourced from a single heat lot for consistency in material characteristics.

Create Custom Cut

QTY

$733.17 ea.

$733.17 for 1

SALE! Save BIG on end of Year Deals!

%7B%22item_id%22%3A%227416%22%2C%22item_name%22%3A%225.75%5C%22+Alloy+Steel+Round+Bar+4340-Normalized+Rough+Turned%22%2C%22item_brand%22%3A%22%22%2C%22item_category%22%3A%22Alloy+Steel%22%2C%22item_category2%22%3A%22Bar-Round%22%2C%22item_category3%22%3A%224340%22%2C%22item_category4%22%3A%22Normalized%22%2C%22item_category5%22%3A%22Rough+Turned%22%2C%22item_category6%22%3A%22%2F%22%2C%22item_category7%22%3A%22%22%2C%22item_category8%22%3A%22false%22%2C%22item_category9%22%3A%22true%22%2C%22item_list_id%22%3A%22%22%2C%22item_list_name%22%3A%22%22%2C%22item_variant%22%3A%22%22%2C%22price%22%3A%22%22%2C%22quantity%22%3A%22%22%7D

5.75" Alloy Steel Round Bar 4340-Normalized Rough Turned -
Part #: 7416

5.75" Alloy Steel Round Bar 4340-Normalized Rough Turned -

Part #: 7416

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Dimensions

Diameter: 5.75"

See all available dimensions for this product

Select a Cut Size for Price Select a Cut Size

12″ (1 ft.) - $955.28 ea.

Save on shipping!

You can select smaller lengths and switch from freight to standard shipping and save!

How does selecting smaller lengths reduce shipping costs?

Best shipping value:

Single Heat Lot Required

Why are heat lots important?

Create Custom Cut

QTY

$955.28 ea.

$955.28 for 1

%7B%22item_id%22%3A%227417%22%2C%22item_name%22%3A%226%5C%22+Alloy+Steel+Round+Bar+4340-Annealed+Hot+Rolled+Rough+Turned%22%2C%22item_brand%22%3A%22%22%2C%22item_category%22%3A%22Alloy+Steel%22%2C%22item_category2%22%3A%22Bar-Round%22%2C%22item_category3%22%3A%224340%22%2C%22item_category4%22%3A%22Annealed%22%2C%22item_category5%22%3A%22Hot+Rolled+Rough+Turned%22%2C%22item_category6%22%3A%22%2F%22%2C%22item_category7%22%3A%22%22%2C%22item_category8%22%3A%22false%22%2C%22item_category9%22%3A%22true%22%2C%22item_list_id%22%3A%22%22%2C%22item_list_name%22%3A%22%22%2C%22item_variant%22%3A%22%22%2C%22price%22%3A%22%22%2C%22quantity%22%3A%22%22%7D

6" Alloy Steel Round Bar 4340-Annealed Hot Rolled Rough Turned -
Part #: 7417

6" Alloy Steel Round Bar 4340-Annealed Hot Rolled Rough Turned -

Part #: 7417

Click for more details

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Dimensions

Diameter: 6"

See all available dimensions for this product

Select a Cut Size for Price Select a Cut Size

12″ (1 ft.) - $924.95 ea.

Save on shipping!

You can select smaller lengths and switch from freight to standard shipping and save!

How does selecting smaller lengths reduce shipping costs?

Best shipping value:

Single Heat Lot Required

Why are heat lots important?

Create Custom Cut

QTY

$924.95 ea.

$924.95 for 1

6" Alloy Steel Round Bar 4340-Normalized Hot Rolled -
Part #: 27148

6" Alloy Steel Round Bar 4340-Normalized Hot Rolled-

Part #: 27148

Click for more details

Dimensions

Diameter: 6"

See all available dimensions for this product

Pricing and availability for this item changes frequently. Contact us now for a fast quote.

%7B%22item_id%22%3A%2227142%22%2C%22item_name%22%3A%226%5C%22+Alloy+Steel+Round+Bar+4340-Normalized+Rough+Turned%22%2C%22item_brand%22%3A%22%22%2C%22item_category%22%3A%22Alloy+Steel%22%2C%22item_category2%22%3A%22Bar-Round%22%2C%22item_category3%22%3A%224340%22%2C%22item_category4%22%3A%22Normalized%22%2C%22item_category5%22%3A%22Rough+Turned%22%2C%22item_category6%22%3A%22%2F%22%2C%22item_category7%22%3A%22%22%2C%22item_category8%22%3A%22false%22%2C%22item_category9%22%3A%22true%22%2C%22item_list_id%22%3A%22%22%2C%22item_list_name%22%3A%22%22%2C%22item_variant%22%3A%22%22%2C%22price%22%3A%22%22%2C%22quantity%22%3A%22%22%7D

6" Alloy Steel Round Bar 4340-Normalized Rough Turned -
Part #: 27142

6" Alloy Steel Round Bar 4340-Normalized Rough Turned -

Part #: 27142

Click for more details

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Dimensions

Diameter: 6"

See all available dimensions for this product

Select a Cut Size for Price Select a Cut Size

12″ (1 ft.) - $1,035.00 ea.
24″ (2 ft.) - $1,956.26 ea.
36″ (3 ft.) - $2,888.89 ea.
Buy 4 at the 12 ft price!
44″ (44 in.) - $3,447.50 ea.
Order to avoid UPS additional handling fees
48″ (4 ft.) - $3,745.71 ea.
72″ (6 ft.) - $5,163.64 ea.
96″ (8 ft.) - $6,611.87 ea.
144″ (12 ft.) - $9,098.90 ea.

Save on shipping!

You can select smaller lengths and switch from freight to standard shipping and save!

How does selecting smaller lengths reduce shipping costs?

Best shipping value:

Single Heat Lot Required

Why are heat lots important?

Create Custom Cut

QTY

$1,035.00 ea.

$1,035.00 for 1

6.25" Alloy Steel Round Bar 4340-Hot Rolled, Normalized & Tempered -
Part #: 29025

6.25" Alloy Steel Round Bar 4340-Hot Rolled, Normalized & Tempered-

Part #: 29025

Click for more details

Dimensions

Diameter: 6.25"

See all available dimensions for this product

Pricing and availability for this item changes frequently. Contact us now for a fast quote.

SALE! Save BIG on end of Year Deals!

%7B%22item_id%22%3A%227419%22%2C%22item_name%22%3A%226.5%5C%22+Alloy+Steel+Round+Bar+4340-Normalized+Rough+Turned%22%2C%22item_brand%22%3A%22%22%2C%22item_category%22%3A%22Alloy+Steel%22%2C%22item_category2%22%3A%22Bar-Round%22%2C%22item_category3%22%3A%224340%22%2C%22item_category4%22%3A%22Normalized%22%2C%22item_category5%22%3A%22Rough+Turned%22%2C%22item_category6%22%3A%22%2F%22%2C%22item_category7%22%3A%22%22%2C%22item_category8%22%3A%22false%22%2C%22item_category9%22%3A%22true%22%2C%22item_list_id%22%3A%22%22%2C%22item_list_name%22%3A%22%22%2C%22item_variant%22%3A%22%22%2C%22price%22%3A%22%22%2C%22quantity%22%3A%22%22%7D

6.5" Alloy Steel Round Bar 4340-Normalized Rough Turned -
Part #: 7419

6.5" Alloy Steel Round Bar 4340-Normalized Rough Turned -

Part #: 7419

Click for more details

Compare

Dimensions

Diameter: 6.5"

See all available dimensions for this product

Select a Cut Size for Price Select a Cut Size

12″ (1 ft.) - $1,294.59 ea.
24″ (2 ft.) - $2,446.95 ea.
36″ (3 ft.) - $3,613.51 ea.
Buy 4 at the 12 ft price!
44″ (44 in.) - $4,312.15 ea.
Order to avoid UPS additional handling fees
48″ (4 ft.) - $4,685.24 ea.

Save on shipping!

You can select smaller lengths and switch from freight to standard shipping and save!

How does selecting smaller lengths reduce shipping costs?

Best shipping value:

Single Heat Lot Required

Why are heat lots important?

Create Custom Cut

QTY

$1,294.59 ea.

$1,294.59 for 1

8" Alloy Steel Round Bar 4340-Normalized Rough Turned -
Part #: 7424

8" Alloy Steel Round Bar 4340-Normalized Rough Turned-

Part #: 7424

Click for more details

Dimensions

Diameter: 8"

See all available dimensions for this product

Pricing and availability for this item changes frequently. Contact us now for a fast quote.

8" Alloy Steel Round Bar 4340-Annealed Rough Turned -
Part #: 27846

8" Alloy Steel Round Bar 4340-Annealed Rough Turned-

Part #: 27846

Click for more details

Dimensions

Diameter: 8"

See all available dimensions for this product

Pricing and availability for this item changes frequently. Contact us now for a fast quote.

%7B%22item_id%22%3A%2227112%22%2C%22item_name%22%3A%228.5%5C%22+Alloy+Steel+Round+Bar+4340-Annealed+Hot+Rolled%22%2C%22item_brand%22%3A%22%22%2C%22item_category%22%3A%22Alloy+Steel%22%2C%22item_category2%22%3A%22Bar-Round%22%2C%22item_category3%22%3A%224340%22%2C%22item_category4%22%3A%22Annealed%22%2C%22item_category5%22%3A%22Hot+Rolled%22%2C%22item_category6%22%3A%22%2F%22%2C%22item_category7%22%3A%22%22%2C%22item_category8%22%3A%22false%22%2C%22item_category9%22%3A%22true%22%2C%22item_list_id%22%3A%22%22%2C%22item_list_name%22%3A%22%22%2C%22item_variant%22%3A%22%22%2C%22price%22%3A%22%22%2C%22quantity%22%3A%22%22%7D