Industrial Precision Fasteners
PED certified stud bolts, ASTM A193 B7 and ASTM A320 L7 bolting, plus A194 2H heavy hex nuts for pressure equipment, industrial valves and oil & gas applications.
Our Capabilities
LOKRON — Industrial Brand
B2B stud bolts, heavy hex nuts and matched flange bolting packages for pressure equipment, valve OEMs, EPC contractors and industrial users worldwide. PED 2014/68/EU certified — valid 2026–2029.
- • PED 2014/68/EU Certified (2026–2029)
- • ASTM A193 B7 / B8 / B8M Stud Bolts
- • ASTM A194 2H / 7 / 8 Heavy Hex Nuts
- • Technical datasheets & mill certificates
FLD Manufacturing
Suzhou Fulida (FLD): 20+ years manufacturing high-strength stud bolts, hex bolts and heavy hex nuts to ASTM, DIN and customer specifications.
- • IATF 16949 Automotive Grade
- • Hot / Cold Heading: M6 – M36
- • CNC Precision: ±0.01mm tolerance
- • Heat Treatment — in-house process control
Industries We Serve
Our ASTM stud bolts and A194 heavy hex nuts are deployed in flanged pipe systems, industrial valves, heat exchangers, pressure vessels and machinery assemblies across critical industries worldwide.
Oil & Gas Fasteners
Stud bolts and heavy hex nuts for pipeline flanges, wellhead equipment and pressure vessels
Petrochemical Fasteners
Bolting for reactors, heat exchangers and corrosive process piping
Power Generation Fasteners
High-temperature bolting for turbine casings, boiler assemblies and steam systems
Industrial Valve Fasteners
Matched stud-and-nut sets for gate, globe, ball and check valves
Automotive
Engine, chassis and driveline fastening solutions
Rail Transit
High-speed rail and metro structural fasteners
Popular Engineering Paths
Start with the pages procurement engineers and application teams use most: torque reference, grade pairing, and PED-certified product scope.
Stud Bolt Torque Calculator
Estimate preload-to-torque for ASTM A193 B7 and A320 L7 assemblies.
Bolt & Nut Pairing Reference
Match A193 and A320 stud bolts with the correct A194 heavy hex nuts.
PED Certified Grade Index
Review PED-certified grades, sizes, documents and typical pressure-equipment uses.
Give procurement and engineering teams a practical preload-to-torque reference.
Our interactive calculator works as a practical stud bolt torque chart for ASTM A193 B7, B7M, B16 and ASTM A320 L7, L7M assemblies using preload, yield percentage, diameter, and friction condition, with dedicated support for low-friction PTFE-coated assemblies.
Industrial stud bolting for valve and pressure equipment service.
LOKRON Genuine Xylan PTFE coating for lower friction scatter and smoother torque transfer.
Trusted By Industry Leaders
JW NEWAY
SUFA
Dongfeng Motor
China Railway
Douson Group
Evalve
Sinopec
Tianye GroupJW NEWAYSUFADongfeng MotorChina RailwayDouson GroupEvalveSinopecTianye Group