- API Spec 6A - Specification for Wellhead and Christmas Tree Equipment
- API Spec 6A718 - Specification for Nickel Base Alloy 718 (UNS N07718) for Oil and Gas Drilling and Production Equipment
- API TR 6AF - Technical Report for Capabilities of API Flanges Under Combinations of Load
- API TR 6AF1 - Technical Report for Temperature Derating of API Flanges Under Combination of Loading
- API TR 6AF2 - Technical Report for Capabilities of API Integral Flanges Under Combination of Loading
- API TR 6AM - Technical Report for Material Toughness
- API Spec 6AV1 - Specification for Verification Test of Wellhead Surface Safety Valves and Underwater Safety Valves for Offshore Service
- API Spec 6A - Specification for Pipeline Valves, Petroleum and natural gas industries - Pipeline transportation systems - Pipeline valves
- API Spec 6D - Specification for Pipeline Valves, Petroleum and natural gas industries — Pipeline Transportation Systems - Pipeline Valves
- API RP 6DR - Recommended Practice for Repair and Remanufacture of Pipeline Valves
- API Spec 6DSS - Specification for Subsea Pipeline Valves, Petroleum and natural gas industries - Pipeline transportation systems - Subsea pipeline valves
- API TR 6F1 - Technical Report for Performance of API and ANSI End Connections in a Fire Test According to API Specification 6FA
- API TR 6F2 - Technical Report for Fire Resistance Improvements for API Flanges
- API Spec 6FA - Specification for Fire Test for Valves
- API Spec 6FB - Specification for Fire Test for End Connections
- API Spec 6FC - Specification for Fire Test for Valve with Automatic Backseats
- API Spec 6FD - Specification for Fire Test for Check Valves
- API Spec 6H - Specification for End Closures, Connectors, and Swivels
- API RP 6HT - Recommended Practice for Heat Treatment and Testing of Large Cross Section and Critical Section
- API Bull 6J - Bulletin for Testing of Oilfield Elastomers (A Tutorial)
- API TR 6J1 - Technical Report for Elastomer Life Estimation Testing Procedures
- API Spec 14A - Specification for Subsurface Safety Valve Equipment, Petroleum and natural gas industries - Downhole equipment - Subsurface safety valve equipment
- API RP 14B - Recommended Practice for Design, Installation, Repair and Operation of Subsurface Safety Valve Systems
- API RP 14H - Recommended Practice for Installation, Maintenance and Repair of Surface Safety Valves and Underwater Safety Valves Offshore
- API Std 598 - Standard for Valve Inspection and Testing
- API Std 599 - Standard for Metal Plug Valves-Flanged, Threaded and Welding Ends
- API Std 600 - Standard for Steel Gate Valves, Flanged and Butt-welding Ends, Bolted Bonnets
- API Std 601 - Standard for Metallic Gaskets for Raised-face Pipe Flanges & Flanged Connections (Double-jacketed corrugated and Spiral-wound)
- API Std 602 - Standard for Steel Gate, Globe and Check Valves for Sizes DN 100 and Smaller for the Petroleum and Natural Gas Industries
- API Std 603 - Standard for Corrosion-resistant, Bolted Bonnet Gate Valves-Flanged and Butt-welding Ends
- API Std 607 - Standard for Testing of Valves-Fire Type-testing Requirements
- API Std 608 - Standard for Metal Ball Valves-Flanged, Threaded and Butt-Welding Ends
- API Std 609 - Standard for Butterfly Valves: Double Flanged, Lug- and Water-Type
- API RP 621 - Recommended Practice for Reconditioning of Metallic Gate, Globe, and Check Valves
- API Std 622 - Standard for Type Testing of Process Valve Packing for Fugitive Emissions
