API 6A ASTM A194 Grade 7 Heavy Hex Nuts for Critical Oil & Gas Applications
ASTM A194 Grade 7 Heavy Hex Nuts are high-strength alloy steel nuts designed for demanding bolted connections in oil & gas, pressure-control and industrial applications. They are used where controlled mechanical properties, dimensional accuracy and material traceability are important.
API 6A fastener assemblies can include heavy hex nuts used with compatible stud bolts in pressure-containing equipment and Industrial Engineering Works connections. ASTM A194 Grade 7 nuts can be supplied for applicable wellheads, Christmas trees, valves, choke manifolds, pipeline systems and offshore drilling equipment according to project and engineering requirements.
Why Choose ASTM A194 Grade 7 Nuts?
High-Strength Alloy Steel Construction
ASTM A194 Grade 7 provides alloy steel construction for demanding industrial and high-pressure fastening applications.
Designed for High-Pressure Service
Grade 7 heavy hex nuts can be specified for high-pressure bolted connections where suitable material and mechanical properties are required.
Excellent Mechanical Performance
Controlled manufacturing and heat treatment help achieve the mechanical properties required by the applicable ASTM specification.
Compatible with API 6A Bolting Assemblies
ASTM A194 Grade 7 nuts can be supplied for compatible API 6A-related bolting assemblies when the material grade is specified by the equipment or project requirements.
Technical Specifications
Available Product Types
Heavy Hex Nuts
ASTM A194 Grade 7 Heavy Hex Nuts for critical oil & gas, pressure-control and industrial bolting applications.
Finished Hex Nuts
Finished hex nut configurations can be supplied where required by the equipment or project specification.
Custom Machined Nuts
Custom-machined Grade 7 nuts can be manufactured according to customer drawings, dimensions, tolerances and application requirements.
Special Thread Nuts
Special thread configurations can be manufactured according to approved drawings and technical requirements.
Compatible Stud Bolts
Available Sizes & Thread Options
Diameter Options
Standard and custom nut diameters can be supplied according to the required stud bolt size and equipment specifications.
UNC Threads
Unified National Coarse threads are available for applicable industrial and oil & gas bolting assemblies.
UNF Threads
Unified National Fine threads can be supplied where required by the application or engineering specification.
8UN Threads
8UN thread configurations can be supplied for applicable large-diameter and high-strength bolting applications.
Metric Threads
Metric thread configurations can be supplied where applicable and specifically requested by the customer.
Custom Sizes
Custom diameters, heights, thread configurations, tolerances and machining requirements can be manufactured according to customer drawings.
Applications
Inspection & Quality Assurance
Hardness Testing
Hardness testing can be performed to verify compliance with applicable ASTM requirements and customer specifications.
Proof Load Testing
Proof load testing can be provided where required to verify the load-carrying capability of the supplied nuts.
Heat Number Traceability
Heat numbers are maintained throughout the applicable manufacturing and testing process to support complete material traceability.
Dimensional Inspection
Nut dimensions, thread characteristics and applicable tolerances are inspected to support product conformity.
EN 10204 3.1 / 3.2 Certificates
Material and inspection certificates can be supplied according to the required certification level, including EN 10204 3.1 or 3.2 where specified.
Third-Party Inspection
Independent third-party inspection can be arranged according to customer, EPC and project requirements.
Why Choose Industrial Engineering Works?
Frequently Asked Questions
What are ASTM A194 Grade 7 Nuts?
ASTM A194 Grade 7 Nuts are alloy steel heavy hex nuts manufactured according to the applicable ASTM A194 Grade 7 requirements for specified high-pressure and industrial bolting applications.
Where are ASTM A194 Grade 7 Nuts used?
They are used in applicable wellheads, Christmas trees, valves, pressure vessels, BOPs, refineries, petrochemical plants and offshore oil & gas equipment.
What is the difference between ASTM A194 Grade 7 and Grade 2H Nuts?
Both are ASTM A194 nut grades, but their material chemistry, mechanical requirements and applicable service conditions differ. The correct grade should be selected according to the equipment design, service conditions and project specification.
Which stud bolts are compatible with ASTM A194 Grade 7 Nuts?
Compatible assemblies may include ASTM A193 B7, ASTM A320 L7 and ASTM A320 L43 stud bolts, subject to the applicable engineering and material requirements.
Can you manufacture custom thread sizes?
Yes. Custom thread sizes, diameters, dimensions and configurations can be manufactured according to customer drawings and project requirements.
Do you provide inspection certificates?
Yes. Material Test Certificates and applicable inspection documentation can be supplied. EN 10204 3.1 or 3.2 certification can be arranged where specified.