Industry
Special fasteners for plant engineering, chemicals and pressure equipment
Bolted flange joints that stay leak-tight under pressure and temperature
Industry we supply today
Bolted flange joints that stay leak-tight under pressure and temperature
Chemical, petrochemical and high-pressure plant engineering is RS Randack’s largest market. Reactors, columns (the tall cylindrical vessels used for distillation and absorption), heat exchangers, valves, compressors and high-pressure piping are held together by bolted flange joints that must stay leak-tight for years under pressure, temperature, temperature cycling and process media. For these joints, RS Randack manufactures stud bolts, studs, hex bolts, reduced-shank bolts and nuts to drawing or standard, as a manufacturer within the meaning of AD 2000 Merkblatt W0 and in accordance with the Pressure Equipment Directive.
Typical parts
- Stud bolts with 8UN or UNC threads in ASTM A193 B7, B16 and A320 L7 with heavy hex nuts to A194 grades 2H, 4 and 7; see American threads
- Studs and reduced-shank bolts to DIN 2510 in 42CrMo4, 21CrMoV5-7 and 40CrMoV4-6 for flanges and covers up to high-temperature service
- Hex head and socket head cap screws in property classes 8.8, 10.9 and 12.9, including large sizes for high-pressure plants
- Stainless and acid-resistant versions in 1.4571, 1.4462 duplex and nickel-based alloys for corrosive media
- Nuts, cap nuts, washers and spacer sleeves from the same production
Requirements and documentation
- Inspection certificate 3.1 to EN 10204 as standard; inspection certificate 3.2 witnessed by a third-party inspection body for pressure equipment to AD 2000 and the Pressure Equipment Directive; witnessed inspections regularly carried out on site
- Materials to EN 10269 and ASTM, with verification of elevated-temperature yield strength or low-temperature impact energy in our own laboratory
- Anti-friction coatings over manganese phosphate with a defined friction coefficient for reproducible preload, zinc flake for corrosion protection; see Surface treatment
- Single-heat supply per line item and full traceability for project documentation and overhauls
What RS Randack brings
Approval as a material manufacturer to AD 2000 W0 and EN 764-5, also for the UK market under UK PESR; ISO 9001 and ISO 14001; in-house materials laboratory with tensile testing up to 3,000 kN and Charpy impact testing down to –70 °C; thread rolling up to M180 for fatigue-resistant flange joints; express service for turnarounds and shutdowns, with a reply within a few hours for urgent requests. Sub-sectors: chemicals and petrochemicals, refineries, high-pressure technology, valve and process equipment manufacturing, process engineering, heat exchanger and boiler construction.
Frequently asked questions
Questions and answers about plant engineering, chemicals and pressure equipment
Does RS Randack supply ASTM A193 B7 stud bolts with inspection certificate 3.2?
Yes: B7, B16 and L7 stud bolts with matching heavy hex nuts, rolled threads, anti-friction coated on request, witnessed by the inspection body of your choice in our own laboratory in Hagen.
Is RS Randack an approved manufacturer to AD 2000 W0?
Yes. RS Randack has been assessed by TÜV NORD as a material manufacturer to AD 2000 Merkblatt W0 and EN 764-5; the certificate is shown on the Quality page.
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