RapidBolt
Power stations
Steam and high-temperature flange joints.
Carbon-molybdenum steel
ASTM A194 Grade 4 Heavy Hex Nuts
ASTM A194 Grade 4 carbon-moly heavy hex nuts for high-temperature and impact-tested bolting, quoted buy-to-order against your project specification.
SUPPLY
Buy-to-order
LEAD TIME
Quoted per RFQ
RECORDS
EN 10204 3.1 / 3.2
GRADE OVERVIEW
A194 Grade 4 nuts, specified correctly.
Grade 4 is a carbon-molybdenum quenched-and-tempered nut specified where projects call for improved elevated-temperature properties over 2H, and in some low-temperature specifications with impact testing.
Pairing is set by the piping or equipment specification. Common pairings include B16 studs; confirm with your design documents.
- GRADE
- ASTM A194 / ASME SA-194 Grade 4
- MATERIAL
- Carbon-molybdenum steel, quenched and tempered
- MATCHED STUD
- ASTM A193 B16 stud bolts
- SIZES
- 1/4"–6" · M5–M150
- FORM
- Heavy hex, to ASME B18.2.2 or your drawing
Reference information only. Your specification and the supplied certificates govern; no stock or equivalence is implied.
WHERE IT IS SPECIFIED01 02 03
Typical applications
Refining
Heater and reactor piping per specification.
Low-temperature service
Where Grade 4 with impact testing is specified.
WHAT TO PUT ON YOUR RFQ
Quoted right the first time.
Size & thread
Nominal size from 1/4" to 6" or M5 to M150, thread pitch (UNC/8UN or metric) and quantity per line.
Matching studs & coating
Pair with ASTM A193 B16 stud bolts; state coating such as zinc, HDG or Xylan/PTFE and any oversize tapping.
Records & testing
EN 10204 3.1 or 3.2, hardness, proof load, PMI or impact testing as your specification requires.
QUESTIONS
A194 Grade 4 FAQs
REQUEST A QUOTE
Send your A194 Grade 4 nut requirement.
Send sizes, quantities, matched studs, coating, certificates and required date, or attach a line list or drawing. EMG confirms sourcing, records and lead time against your RFQ.
ISO 9001:2015 quality-managed supply
