RapidBolt
Sour gas
H₂S-containing wellhead, gathering and processing piping.
Carbon steel, hardness-controlled
ASTM A194 Grade 2HM Heavy Hex Nuts
ASTM A194 2HM heavy hex nuts with controlled hardness for sour service, paired with A193 B7M studs and quoted buy-to-order with full records.
SUPPLY
Buy-to-order
LEAD TIME
Quoted per RFQ
RECORDS
EN 10204 3.1 / 3.2
GRADE OVERVIEW
A194 2HM nuts, specified correctly.
Grade 2HM is the hardness-limited version of 2H. It is commonly specified with B7M studs where sour-service requirements such as NACE MR0175 / ISO 15156 apply.
State the sour-service clause, any 100% hardness testing and required marking on the RFQ so the nut lot and certificates are confirmed before order.
- GRADE
- ASTM A194 / ASME SA-194 Grade 2HM
- MATERIAL
- Medium-carbon steel, quenched and tempered to a controlled hardness
- MATCHED STUD
- ASTM A193 B7M 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
Hydrotreater and amine-unit flanges under sour specifications.
Offshore
Topsides piping where hardness-controlled bolting 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 B7M 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 2HM FAQs
REQUEST A QUOTE
Send your A194 2HM 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
