4130 STRIP 1-1/4" X 18" X .250

Part# 03-20000
ThicknessSize (in.)PNBuy
3 Ft
.2501-1/4 x 1803-20000
(18" Only)


*Formerly MIL-S-18729C

This chromium-molybdenum alloy is one of the most widely used aircraft steels because of its combination of weldability, ease of fabrication and mild hardenability. It will respond to heat treatment to high strength levels and yet, in the annealed condition, it has adequate strength for many applications. Used for the manufacture of parts and components. 4130 Steel Strips may be ordered in full lengths (6 ft.) or in 1/2 lengths (3 ft.). Please note that it is cheaper to ship 3 ft. lengths as full lengths are subject to UPS oversize charges. 1/2 lengths my be ordered by using .5 as a quantity. Full lengths may be ordered and we will cut in half at no extra charge if cutting is specified at time of order. PN 03-20000 have a slight curve due to shearing.

If Mfg. Test Reports are required, there's a minimum $15.00 charge per order. Please indicate P/N 01-01133 in the Special Instructions Box during the checkout process.
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WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.


Joel S Verified Purchase

4130 STRIP 1-1/4" X 18" X .250

July 14, 2022

William E Verified Purchase

4130 STRIP 1-1/4" X 18" X .250

June 23, 2022

everything as expected

Puddle J Verified Purchase

4130 STRIP 1-1/4" X 18" X .250

April 9, 2022


Bernard T
April 13, 2021

Fantastic. And it is always nice to have a drive to Brantford. Thanks. Dennis.

Dennis T
March 26, 2021

Good quality 4130 strips. Nicely packed for shipping.

January 18, 2021

Packaged well, and arrived on time in good condition.

Larry V
December 3, 2020

Thank you

Rick H
August 10, 2020

Good steel for being bent with a hammer and used for a crankshaft scraper in the oil pan

Gildermaster M
March 20, 2020

Not much to review it is what it is I do appreciate the fast shipping that will make me a return customer.

Brian H
November 28, 2019


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Can you please confirm if the price is per 6ft length, not per foot?

The price is for 6 ft lengths. To order 3 ft lengths, use quantity 0.5.

Q: Re: Item 03-19800 (.125 thick 1-1/2 wide). Are 10 foot lengths available?

No. 6 foot is the max length.

Q: Is there any info on the ultimate tensile strength for the 4130 strips? Is it annealed?

Tensile strength varies by size and lot. Certified test reports with tensile strength information are available upon request at time of order. Yes, it is annealed.

Q: Are the 4130 steel strips hot roll or cold roll?

This will be cold rolled.

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