API 6A Stud & Heavy Hex Nut Kit, ASTM A193 B7M / A194 2HM, Sour Service — for 13-5/8" 10K Flange

The API 6A Stud & Heavy Hex Nut Kit, ASTM A193 B7M / A194 2HM, Sour Service — for 13-5/8" 10K Flange is a recurring-purchase stud & nut kit sized for 13-5/8" bore BOP equipment. Studs and nuts are replaced when surface condition shows galling, corrosion, or stretch beyond limits. B7M (HRC ≤ 22) is the GCC sour-service default; L7M for low-temperature sour. API 20E BSL-2 / BSL-3 traceability available on request. NACE MR0175 / ISO 15156 sour-service compliant — required across Saudi Aramco, ADNOC, KOC, PDO, QatarEnergy default specifications for the GCC.

Construction

• Spare-part type: Stud & Nut Kit
• Fits OEM: API 6A 13-5/8" 10K flange — Cameron / FMC / Stream-Flo / NOV / WOM wellheads + BOPs
• BOP bore size: 13-5/8"
• Cold working pressure: 10,000 psi (10K class)
• Service class: Sour Service (NACE MR0175)
• Bolting grade: ASTM A193 B7M (per NACE MR0175 for sour service)
• Material: ASTM A193 B7M studs (HRC ≤ 22 per NACE MR0175) with ASTM A194 2HM heavy-hex nuts; phos-coated for assembly, anti-seize on threads
• Temperature rating: -20°F to 250°F (-29°C to 121°C) — sour-service NACE MR0175 envelope

Kit contents

ASTM A193 B7M studs (12-count, 1-1/4"-8 UN × 9-1/2" length per API 6A 13-5/8" 10K) + ASTM A194 2HM heavy-hex nuts (24-count, top + bottom) — phos-coated, anti-seize on threads

OEM compatibility

Engineered as a recognised aftermarket-acceptable replacement for the following OEM equipment lines (Indus Hydraulics is not an authorised distributor of these OEMs — parts are manufactured to the OEM dimensional standard with full mill test reports and API monogram traceability):

• API 6A B7M stud kit 13-5/8" 10K
• ASTM A193 B7M
• ASTM A194 2HM heavy hex nut

Applications

• BOP / wellhead 13-5/8" 10K flange make-up bolting
• Aramco / ADNOC / KOC / PDO sour-service drilling
• Replacement bolting on existing flanges (stretched / galled bolts)
• New-build BOP installation bolting

Performance & testing

Each unit is dimensionally inspected against the OEM datum, dye-penetrant or magnetic-particle inspected for surface defects, and shipped with mill test reports per EN 10204 3.1 / 3.2. Elastomer parts are batch-tested for hardness, compression set, and fluid resistance (sour service variants tested per NACE TM0297 / TM0187 where applicable). Charpy V-notch impact testing on metallic parts available where service requires low-temperature toughness verification.

Compliance

• API 6A (per part class)
• NACE MR0175 / ISO 15156 (sour-service / H₂S)
• EN 10204 3.1 / 3.2 mill test reports
• Dimensional inspection report per part
• Heat-number / batch traceability
• API 20E BSL-2 / BSL-3 bolting on request

Sealed & dated packaging (GCC climate)

50 °C ambient + UV degrades unsealed elastomers in storage. Indus ships every elastomer / packing element / soft-goods kit in heat-sealed UV-resistant bags with manufacture date, batch number, and recommended-use-by date stamped on the outer label. Re-sealable bins for partial use. This is what Aramco / ADNOC / KOC supplier audits ask about — make sure you specify "sealed dated packaging" on the RFQ.

How to order

Confirm on your RFQ: (a) exact OEM part number or BOP serial number being serviced (we cross-reference to the matched aftermarket part), (b) bore size and working pressure, (c) drill-pipe or casing OD if a ram packer or VBR, (d) elastomer compound preference (HNBR / AFLAS for sour service GCC default), (e) bolting grade (B7M / L7M for sour), (f) certification requirements (NACE, charpy, mill 3.2 vs 3.1, IKTVA / ICV documentation), (g) destination port and packaging requirements. Indus quotes ex-Dubai (AED) — sales@indushydraulics.me or WhatsApp +971.