Name: NF NC21FeDU Nut
Material: NiCr21Mo
Standard: NF, BSW, ANSI, DIN
Size: M64
Hardness: Max. 200 HB
Feature: Good resistance to stress corrosion cracking
Application: For Industrial areas where the temperature does not exceed 550 degrees Celsius
Source: https://www.valvegasketboltnuts.com/nf-nc21fedu-nut-din-w-nr-2-4858-nicr21mo-m64-200-hb.html
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