What are API 6A Christmas Tree Fasteners?
API 6A Christmas Tree Fasteners are Industrial Engineering Works components used in Christmas tree equipment and associated oil and gas pressure-control systems. These fasteners are designed for demanding bolted connections where strength, dimensional accuracy, material control and reliable performance are essential.
Christmas tree equipment contains pressure and flow-control components installed above a wellhead. Reliable closure bolting is important for maintaining secure connections between pressure-containing components during drilling and production operations.
API 6A defines requirements for applicable wellhead and Christmas tree equipment, while API 20E provides relevant requirements for qualification and manufacturing of bolting materials used in critical applications. Where specified, API 20E-qualified fasteners can be supplied with appropriate material traceability, testing and documentation.
Features of API 6A Christmas Tree Fasteners
High Tensile Strength
API 6A Christmas tree fasteners can be manufactured from high-strength alloy and carbon steel materials selected according to the applicable equipment and project requirements.
Reliable Sealing Performance
Properly specified and dimensionally controlled fasteners support secure bolted connections and help maintain the required clamping force across pressure-containing assemblies.
Excellent Fatigue Resistance
Controlled material selection, heat treatment and manufacturing processes help provide suitable mechanical performance for applications exposed to repeated loading.
Corrosion Resistant Materials
Stainless steel, duplex and super duplex materials, along with applicable protective finishes, can be supplied for environments where enhanced corrosion resistance is required.
API 20E Qualified Manufacturing
Where applicable, manufacturing can follow the relevant API 20E requirements for Industrial Engineering Works, including material controls, production requirements, inspection and documentation.
100% Material Traceability
Material identification and applicable batch traceability documentation help maintain traceability from incoming material through manufacturing, inspection and final supply.
Applications
Available Fastener Types
Available Fastener Types
API 6A stud bolts for critical Christmas tree and pressure-control bolting assemblies, available according to specified dimensions, materials and thread requirements.
API 6A Heavy Hex Nuts
Heavy hex nuts designed for compatible stud bolt assemblies and critical bolted connections.
API 6A Bolts
API 6A bolts for specified Christmas tree equipment and related oil and gas applications.
Tap End Studs
Tap end studs for applications requiring a specified threaded engagement and engineered fastening configuration.
Double End Studs
Double end studs with threaded ends for applicable Christmas tree and pressure-control equipment connections.
Custom Engineered Fasteners
Custom fasteners can be manufactured according to customer drawings, dimensions, material requirements, thread configuration and project specifications.
Available Material Grades
Quality Assurance & Testing
API 20E Compliant Manufacturing
Applicable manufacturing controls can be followed for API 20E-qualified Industrial Engineering Works, including material identification, production controls and specified documentation.
Mechanical Testing
Mechanical testing is performed according to the applicable material and product requirements to verify specified mechanical properties.
Hardness Testing
Hardness testing helps confirm that supplied fastener materials meet the applicable hardness requirements.
Positive Material Identification (PMI)
PMI testing verifies material composition and supports accurate material identification and traceability.
Magnetic Particle Inspection (MPI)
MPI can be performed on suitable materials to identify applicable surface and near-surface discontinuities.
Ultrasonic Testing (UT)
Ultrasonic testing can be provided where required to evaluate applicable internal material conditions.
Dimensional Inspection
Fastener dimensions, thread characteristics and other specified requirements are checked to support product conformity.
Third-Party Inspection
Third-party inspection can be arranged according to customer, EPC, OEM or project requirements.
Material Test Certificates (MTC)
Material Test Certificates can be provided with applicable chemical, mechanical and material information.
Full Batch Traceability
Batch and material identification is maintained to support traceability throughout the applicable manufacturing and supply process.
Technical Specifications
| Parameter | Details |
|---|---|
| Product | API 6A Christmas Tree Fasteners |
| Standard | API 6A |
| Qualification | API 20E / API 20F |
| Fastener Types | Stud Bolts, Bolts, Heavy Hex Nuts |
| Material Grades | ASTM A193, ASTM A194, ASTM A320 |
| Thread Type | UNC / UNF |
| Finish | Plain, Black Oxide, Zinc, PTFE, Xylan |
| BSL Levels | BSL-1, BSL-2, BSL-3 |
| Inspection | PMI, MPI, UT |
| Certification | EN 10204 3.1 / 3.2 |
Why Choose Industrial Engineering Works?
Frequently Asked Questions
What are API 6A Christmas Tree Fasteners?
API 6A Christmas Tree Fasteners are specialized studs, bolts, nuts and related fastening components used in Christmas tree equipment and associated wellhead and pressure-control systems. They are designed for critical bolted connections where reliable mechanical performance and controlled material requirements are important.
What is API 20E qualification?
API 20E establishes requirements related to the qualification and manufacturing of bolting materials used in critical applications. Where applicable, API 20E-qualified fasteners are manufactured and documented according to the relevant requirements.
Which fasteners are used in Christmas tree equipment?
Common fasteners include stud bolts, heavy hex nuts, bolts, tap end studs and double end studs. The appropriate configuration depends on the equipment design, material specification and project requirements.
What are BSL-1, BSL-2 and BSL-3?
BSL-1, BSL-2 and BSL-3 are Bolting Specification Levels associated with API 20E. The applicable level determines relevant qualification, manufacturing, inspection, testing and documentation requirements.
Which ASTM material grades are available?
Available grades include ASTM A193 B7 and B7M, ASTM A320 L7 and L7M, ASTM A194 Grade 2H, along with stainless steel, duplex stainless steel and super duplex stainless steel options.
What coatings can be supplied?
Available finishes can include plain, black oxide, zinc, PTFE and Xylan, subject to material compatibility and customer requirements.
Can custom sizes be manufactured?
Yes. Custom Christmas tree fasteners can be manufactured according to customer drawings, dimensions, material grades, thread configurations and project specifications.
Do you provide EN 10204 3.1 / 3.2 certificates?
Yes. EN 10204 3.1 / 3.2 certification can be supplied where required by the customer or project specification.
Do you export Christmas tree fasteners to the USA?
Yes. API 6A Christmas Tree Fasteners can be supplied to customers across the USA along with worldwide export capabilities.
How do Christmas tree fasteners differ from standard industrial fasteners?
Christmas tree fasteners are intended for specialized wellhead and pressure-control applications where equipment specifications, material requirements, traceability, testing and documentation can be significantly more demanding than those for conventional industrial fastening applications.