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79 product categories
Group B: Low Alloy Steels
Group C: Stainless Steels Other Than Duplex
Group D: Duplex Stainless Steels
Group E: Nickel Base Alloys (CRA)
Group 1: Carbon and Microalloyed Steels
Group 2: Low Alloy Steels
Group 3: Austenitic, Martensitic and Martensitic Precipitation Hardening Stainless Steels
Group 4: Duplex and Superduplex Stainless Steels
Group 5: Nickel Based Alloys
Group 1: Carbon and low-alloy carbon steels
Group 2: Austenitic, martensitic, and PH martensitic stainless steels
Group 3: Corrosion-resistant alloys
Group 4: Duplex stainless steel
Cold Formed Bolts, Screws, and Nuts
Studs
Machined Bolts, Screws and Nuts
Hot Formed Bolts and Screws
About product categories and sources
Includes 324 product categories from the API Composite List search snapshot. Chinese labels are OFMP reading aids, not official API translations; original English names are retained for comparison. Product categories and certificates do not establish specific models, availability or delivery capability; confirm these with suppliers. Category snapshot: 2026-10-10
View the API category source