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Type 303 is "18-8" chromium-nickel stainless steel modified by the addition of selenium or sulphur, as well as phosphorus, to improve machinability and non- seizing properties. It is the most readily machinable of all the chromium-nickel arades and has good corrosion resistance It is non-magnetic in the annealed condition and not hardenable by heat treatment. Tensile strength and hardness can be increased by cold working. It is manufactured by the electric-furnace process and meets the exacting requirements of the aircraft industry.

UNS S30300. S30323

Color Marking

Type 303Se
Annealed Bars: Ends painted Purple
High Tensile Bars (Condition B): Ends painted Brown

Physical Condition A

Stock Lengths 10' to 12' and 20' to 22'

Max. Brinell 207
Unit of Measure
1 

Size

Estimated Weight per Foot

Estimated Weight 12-Ft. Bar

3 1/8 N/A 26.10 lb N/A 313.2 lb
3 1/4 N/A 28.23 lb N/A 338.8 lb
3 3/8 N/A 30.45 lb N/A 365.3 lb
3 1/2 N/A 32.74 lb N/A 392.9 lb
3 5/8 N/A 35.12 lb N/A 421.5 lb
3 3/4 N/A 37.59 lb N/A 451.0 lb
3 7/8 N/A 40.14 lb N/A 481.6 lb
4 N/A 42.77 lb N/A 513.2 lb
4 1/4 N/A 48.28 lb N/A 579.3 lb
4 3/8 N/A 51.16 lb N/A 613.9 lb
4 1/2 N/A 54.13 lb N/A 649.5 lb
4 5/8 N/A 57.18 lb N/A 686.1 lb
4 3/4 N/A 60.31 lb N/A 723.7 lb
4 7/8 N/A 63.52 lb N/A 762.3 lb
5 N/A 66.82 lb N/A 801.9 lb
5 1/4 N/A 73.67 lb N/A 884.0 lb
5 1/2 N/A 80.86 lb N/A 970.2 lb
5 3/4 N/A 88.37 lb N/A 1060 lb
6 N/A 96.22 lb N/A 1155 lb
6 1/4 N/A 104.4 lb N/A 1253 lb
6 1/2 N/A 112.9 lb N/A 1355 lb
6 3/4 N/A 121.8 lb N/A 1461 lb
7 N/A 131.0 lb N/A 1572 lb
7 1/4 N/A 140.5 lb N/A 1686 lb
7 1/2 N/A 150.4 lb N/A 1804 lb
7 3/4 N/A 160.5 lb N/A 1926 lb
8 N/A 171.1 lb N/A 2053 lb
8 1/4 N/A 181.9 lb N/A 2183 lb
8 1/2 N/A 193.1 lb N/A 2317 lb
9 N/A 216.5 lb N/A 2598 lb
9 1/2 N/A 241.2 lb N/A 2895 lb
10 N/A 267.3 lb N/A 3207 lb
11 N/A 323.4 lb N/A 3881 lb
12 N/A 384.9 lb N/A 4619 lb
Unit of Measure
1