Pressure equipment
Flanges, valves and pressure vessels
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ASTM A194 Grade 2H
ASTM A194 Grade 2H Heavy Hex Nuts | Matched Industrial Bolting
Heavy hex nuts for high-pressure and high-temperature flange assemblies, matched with ASTM A193 B7 and compatible stud bolts.
A194 2HHeavy hex nutsB7 nut pairingFlange bolting
Quick answer
ASTM A194 Grade 2H is a common heavy hex nut grade for pressure-boundary bolting, especially when paired with ASTM A193 B7 studs. LOKRON supplies matched sets with dimensional inspection, hardness control and lot-specific material documentation.
Specification and supply scope
| Standard | ASTM A194 / ASME SA194 Grade 2H; heavy hex dimensions and thread form to the project requirement. |
|---|---|
| Common pairing | ASTM A193 B7, B16 and other compatible alloy-steel stud bolts. |
| Thread options | UNC/UNF and metric threads available subject to size, fit and purchase specification. |
| Finishes | Plain, zinc-plated, PTFE/Xylan and other approved surface treatments. |
| Quality records | MTR, hardness, dimensional inspection and coating records as applicable. |
Typical applications
- âASME B16.5 and B16.47 flange sets
- âIndustrial valve bonnet and body assemblies
- âPetrochemical and refinery piping
- âPressure-vessel and heat-exchanger closures
Documentation available
- âMaterial test report and heat traceability
- âHardness and dimensional inspection
- âThread gauging records where required
- âMatched-set packing and identification
Related engineering resources
Need a grade, drawing or complete bolting set?
Send the standard, size, quantity, coating and service condition. LOKRON's technical sales team can confirm scope and documentation within 24 hours.
Request a technical quoteFrequently asked questions
What stud bolt is normally paired with A194 2H nuts?
A193 B7 stud bolts are the common pairing, but the final selection must follow the project material and service specification.
Are A194 2H nuts suitable for stainless steel studs?
Not automatically. Stainless and alloy-steel combinations require review of strength, galling, corrosion and temperature compatibility.
Can LOKRON supply complete stud-and-nut sets?
Yes. Provide the stud grade, nut grade, diameter, length, thread, quantity and finish so the set can be quoted as one controlled package.
Engineered for demanding applications
See where LOKRON high-strength fasteners perform: pressure equipment, process plants, power generation and precision vehicle systems.
Oil & gas
Pipeline and high-pressure flange service
Petrochemical
Heat exchangers and process piping
Power generation
High-temperature and critical-duty joints