The oil and gas industry operates under some of the most aggressive pressure, thermal, and corrosive conditions on earth. From ultra-deepwater subsea drilling risers to high-pressure/high-temperature (HP/HT) surface trees and refineries, mechanical integrity depends entirely on critical bolting. As an ADNOC Approved AVL Vendor and Saudi Aramco Approved AVL manufacturer, Intact360 guarantees zero-defect fastener reliability for major national oil companies (NOCs) and international EPC contractors worldwide.
Intact360 Industries manufactures and supplies a complete spectrum of certified API 20E (alloy & carbon steel) and API 20F (corrosion-resistant alloy) bolting products. Incorporating the stringent requirements of the API Spec 20E Third Edition, our manufacturing processes guarantee complete raw material traceability, controlled heat treatment, rigorous non-destructive examination (NDE), and precise dimensional verification.
- Approved Vendor Approvals: ADNOC Approved AVL Vendor and Saudi Aramco Approved AVL Manufacturer.
- Fully certified manufacturing to API 20E BSL-1, BSL-2, BSL-3 and API 20F BSL-2, BSL-3 requirements.
- Full compliance with API Spec 20E Third Edition processes and procedures.
- Extensive raw material stock including ASTM A193, A320, A194, A453, A540, Duplex, and CRA Nickel Alloys.
- Supplied with comprehensive EN 10204 3.1 / 3.2 Material Test Certificates covering heat analysis, Charpy impact, hardness, and NDT reports.
- Precision manufactured products: Fully Threaded Studbolts, ASTM A194 2H/7 Heavy Hex Nuts, Tap End Studs, Collar Flange Bolts, Hex Bolts, Socket Head Cap Screws, 12-Point Fasteners, and Engineered Heavy Washers.
- Specialized anti-corrosion coatings including Xylan/PTFE, Zinc-Nickel, Cadmium, Hot-Dip Galvanizing, Phosphating, and Copper Plating.
- Fast-track production lines for urgent shutdown and project turnaround deliveries worldwide.
Oil & Gas Fastener Product Portfolio
Intact360 manufactures a full range of high-pressure, severe-service fastener geometries engineered to ASME, ANSI, DIN, ISO, and client-specific drawings for onshore, offshore, and subsea oilfield installations:
Continuous threaded studs engineered for high-pressure ANSI/API flanged joints and pressure vessel connections.
High-strength heat-treated heavy hex nuts (2H, 2HM, 7, 7M, 8M, 16) designed to match high tensile studbolts under severe tension.
Double-ended studs with a shorter thread length on one end engineered for threading directly into tapped valve bodies and pump casings.
Precision collar bolts engineered for subsea pipeline flanges, Compact Flanges, and specialized API wellhead equipment.
Heavy hex structural bolts and machine screws manufactured to close tolerances for structural steel and equipment mounting.
High tensile internal drive fasteners ideal for confined spaces in blowout preventers (BOPs), chokes, and control manifolds.
High-fatigue, high-strength 12-point flange fasteners widely specified in subsea trees, turbines, and aerospace-grade oilfield machinery.
Heavy-duty structural washers (ASTM F436 / DIN 6916) providing uniform load distribution across critical circular flange faces.
Custom engineered 12-point bi-hex bolts, slotted nuts, collar studs, and bespoke machining fasteners engineered to OEM drawings.
API 20E & 20F Bolting Specification Levels (BSL)
The American Petroleum Institute establishes three distinct Bolting Specification Levels (BSL-1, BSL-2, and BSL-3). These BSL designations define ascending technical, quality, testing, and qualification criteria. As the consequence of potential bolting failure increases in critical applications, higher BSL levels are specified to eliminate risk.
- BSL-1 (API 20E Only): Establishes baseline quality, chemical composition, heat treatment, and mechanical testing requirements for standard alloy and carbon steel oilfield bolting.
- BSL-2 (API 20E & API 20F): Introduces enhanced volumetric non-destructive examination (NDE), stricter heat treatment controls, elevated temperature testing, and magnetic particle / liquid penetrant inspection.
- BSL-3 (API 20E & API 20F): Represents the absolute pinnacle of quality criticality. Reserved for applications where bolting failure is not an acceptable option, requiring 100% NDE inspection, microstructural analysis, and individual component serial traceability.
Comprehensive Material Grades & Alloys Stocked
Intact360 maintains extensive mill-certified raw bar stock, enabling rapid production across standard carbon steels, high-temperature alloys, stainless steels, duplex alloys, heat resisting grades, and exotic non-ferrous metals:
Mandatory Applications Across API Specifications
API 20E and API 20F compliant bolting is mandatory for critical equipment manufactured in accordance with key energy standards, including API 6A, API 6D, API 6DSS, API 16A, API 16C, and API 17D.
Primary oil & gas equipment utilizing our certified bolting includes:
- Blow Out Preventers (BOPs) & Drill-Through Equipment
- Subsea Wellheads, Christmas Trees & Manifolds
- Drilling & Production Risers, Jumpers & Gas Export Systems
- High Pressure / High Temperature (HP/HT) Flanged Connections
- Pipeline Valves, Choke & Kill Manifolds, and Subsea Connectors
API 20E Alloy Steel Material Specifications
| Standard Material Grade | Specification Type | Service & Operating Conditions |
|---|---|---|
| ASTM A193 Grade B7 / B7M | Alloy Steel (AISI 4140/4142) | High-temperature and standard high-pressure oilfield service. B7M variant features 100% hardness testing for NACE MR0175 sour service. |
| ASTM A320 Grade L7 / L7M / L43 | Low-Temperature Alloy Steel | Severe low-temperature impact service (down to -150°F / -101°C). L43 offers enhanced hardenability for heavy section studs. |
| ASTM A194 Grade 2H / 7 / 2HM / 7M | High Tensile Heavy Hex Nuts | Companion heavy hex nuts engineered to match A193 and A320 studbolts under extreme tensile loads and sour service environments. |
| ASTM A540 Grade B22 / B23 (Class 1-5) | Special High-Strength Alloy Steel | Extreme strength bolting for nuclear, subsea BOP, and ultra-high pressure wellhead containment systems. |
API 20F Corrosion Resistant Material Specifications
| CRA Alloy Grade | Material Class / Strength Level | Corrosion Resistance & Applications |
|---|---|---|
| ASTM A453 Grade 660 | Class A, B, C & D (A286 Stainless) | High-temperature precipitation hardening iron-base CRA alloy for subsea and valve flange bolting. |
| API 6ACRA UNS N07716 / N07725 | Inconel® 716 / 725 (120K & 140K) | Age-hardened nickel alloys with outstanding resistance to hydrogen embrittlement, pitting, and sour gas corrosion. |
| API 6ACRA UNS N07718 | Inconel® 718 (120K & 140K) | High-strength nickel-chromium CRA alloy engineered for extreme HP/HT subsea wellhead and BOP bolting. |
| API 6ACRA UNS N09925 / N09935 / N09945 | Incoloy® 925 / 945 (110K, 125K, 140K) | Premium nickel-iron-chromium alloys offering immunity to chloride stress corrosion cracking in aggressive oilfield brine. |
| UNS R30035 (MP35N®) | Work Strengthened & Aged | Ultra-high strength cobalt-nickel-chromium-molybdenum alloy for supreme subsea critical service applications. |
| Duplex & Super Duplex | UNS S31803, S32205, S32750, S32760 | High PREN stainless steels for marine, offshore riser, and subsea manifold piping systems. |
Advanced Protective Coatings & Surface Finishes
To prevent galling, ensure uniform torque-tension relationships, and withstand marine atmospheric exposure, Intact360 applies high-performance surface coatings engineered specifically for energy infrastructure.
Our comprehensive coating options include:
- PTFE Fluoropolymer (Xylan® / Xylar®): Multi-layer low friction coatings providing exceptional chemical barrier protection and consistent torque coefficients.
- Zinc-Nickel Electroplating (ZnNi): High-performance sacrificial alloy coating enduring 1,500+ hours of continuous salt spray testing without red rust formation.
- Hot-Dip Galvanizing (HDG) & Sherardizing: Heavy duty zinc coatings ideal for structural marine and offshore topside installations.
- Cadmium & Copper Plating: Excellent anti-galling lubrication properties for high-pressure threaded valve stem and subsea connections.
- Zinc & Manganese Phosphating: Oil-retaining baseline protective finishes for standard indoor and oil-immersed subsea machinery.
We understand that unplanned drilling rig downtime and refinery turnarounds cost millions. Intact360 maintains substantial raw material stock of API-compliant alloys, allowing rapid execution and short-lead manufacturing of custom studbolts, tap end studs, and heavy hex nuts for urgent global dispatch.
Need Certified API 20E & 20F Bolting?
Send your tender specifications, material grade requirements, or engineering drawings directly to our technical sales team for immediate factory-direct pricing.
API 20E & API 20F Bolting Technical FAQ
What is the difference between API 20E and API 20F bolting specifications?
What are Bolting Specification Levels (BSL-1, BSL-2, and BSL-3)?
What API equipment specifications mandate API 20E and API 20F fasteners?
What material grades are qualified under API 20E and API 20F?
What anti-corrosion protective coatings are available for subsea studbolts?
Does Intact360 supply material test certificates with API 20E and 20F orders?
Get Certified Oil & Gas Bolting Delivered Worldwide
Send your project requirements, tender documentation, or technical inquiries directly to our specialists for quick turnaround quotes.