1. Core Overview & Target Application Brief
This dedicated spare parts catalog is precision engineered exclusively for the NOV ST80C Iron Roughneck, the industry-leading hydraulic tubular makeup/breakout tool deployed across onshore drilling rigs, offshore jack-ups, and modular drilling platforms. Tailored to the specialized needs of rig floor technicians, drilling maintenance supervisors, oilfield service contractors, and drilling operations managers, this parts suite directly addresses the most costly and disruptive field pain points: hydraulic seal leaks, transmission bearing fatigue, jaw assembly misalignment, hydraulic fitting failures, and unplanned downtime that halts critical drill pipe connection operations.
2. Detailed Product & Component Specifications
2.1 Product Introduction
The NOV ST80C Iron Roughneck spare parts line features heavy-duty, wear-resistant components built to withstand extreme hydraulic pressure (up to 2000 PSI), continuous vibration, and abrasive rig floor conditions. Each part—spanning transmission assemblies, roller bearings, Garlock seals, hydraulic manifold kits, jaw assemblies, and SAE hydraulic fittings—is crafted from premium materials: forged alloy steel for load-bearing transmission components, high-carbon steel for jaw plates, oil-resistant nitrile/FKM seals for hydraulic systems, and precision-ground roller bearings for high-torque rotation. All critical parts are machined to a dimensional accuracy of ±0.002 inches, ensuring direct interchangeability with original NOV ST80C hardware without modification.
2.2 Key Functional Specifications
- Hydraulic System Compatibility: Engineered for the ST80C’s 2000 PSI hydraulic drive system, with O-ring boss fittings and manifold assemblies ensuring leak-free fluid transfer for consistent torque output.
- Wear Life Metrics: Precision roller bearings (30160731) deliver 15,000+ operating hours of service; Garlock hydraulic seals resist degradation for 8,000+ hours; jaw assemblies withstand 50,000+ makeup/breakout cycles.
- Sealing Performance: All hydraulic seals and O-rings operate reliably in a temperature range of -20°C to 55°C, preventing fluid leaks and contamination in extreme drilling environments.
- Torque Transmission Reliability: LH/RH transmission assemblies maintain precise torque delivery to the upper/lower jaws, meeting API 7K torque accuracy requirements for tubular connections.
2.3 Structural Design Features
- OEM Direct Interchangeability: Every part fits the original NOV ST80C mounting and mating specifications, cutting repair and installation time by up to 50% in remote rig locations.
- Modular Subassembly Design: Pre-assembled transmission kits, jaw assemblies, and manifold sets streamline complex overhauls, even with limited on-site technical support.
- Leak-Proof Hydraulic Fittings: SAE 37° and O-ring boss fittings eliminate hydraulic fluid loss, a top failure mode for high-torque iron roughnecks.
- Vibration-Resistant Hardware: Locking hinge pins and reinforced guide plates prevent component loosening from rig floor vibration and cyclic loading.
2.4 Applicable Operating Conditions
These NOV ST80C Iron Roughneck parts are optimized for reliable performance across core drilling scenarios, including:
- Onshore land drilling rigs (conventional and directional drilling)
- Offshore jack-up and semi-submersible drilling platforms
- Drill pipe makeup/breakout operations (4.25″ to 8.50″ tubular OD range)
- High-cycle continuous drilling operations
- Harsh offshore saltwater and corrosive environments
- Compliance with global rig floor safety and API equipment standards
2.5 Proactive Maintenance & Service Recommendations
To maximize the lifespan of the NOV ST80C Iron Roughneck and avoid costly downtime, follow these industry-approved maintenance protocols using this parts catalog:
- 200-Cycle Inspection: Check hydraulic fittings for leaks, inspect roller bearing play, tighten hinge pin locks, and replace worn Garlock seals immediately to prevent fluid loss.
- 1000-Cycle Service: Replace roller bearings, install new hydraulic manifold seals, inspect jaw plate wear, and lubricate transmission components to reduce friction.
- 5000-Cycle Overhaul: Rebuild LH/RH transmission assemblies, replace upper/lower jaw assemblies, swap all hydraulic fittings, and calibrate valve bank and manifold components.
Storage & Preservation: Seal all hydraulic ports with cavity plugs and install protective seals during long-term storage to prevent contamination and corrosion.
- We supply the following spare parts:
| Item No | Manufacturer | P/N | Material | UM |
| 1 | NOV, RANGER OILFIELD, GDS | 93667-X13, XGCA-XXN | CAVITY PLUG | EA |
| 2 | NOV, RANGER OILFIELD, GDS | 30171609 | VALVE BANK ASSY. | EA |
| 3 | NOV, RANGER OILFIELD, GDS | 30170499 | GUIDE PLATE | EA |
| 4 | NOV, RANGER OILFIELD, GDS | 30171626 | COLUMN BASE ASSY. | EA |
| 5 | NOV, RANGER OILFIELD, GDS | 30170649-500 | FLANGE, SOCKET | EA |
| 6 | NOV, RANGER OILFIELD, GDS | M361005461-501 | LH TRANSMISSION | EA |
| 7 | NOV, RANGER OILFIELD, GDS | 301603389 | ASSY, LH TRANSMISSION | EA |
| 8 | NOV, RANGER OILFIELD, GDS | M361005461-500 | RH TRANSMISSION | EA |
| 9 | NOV, RANGER OILFIELD, GDS | 30160392 | ASSY, RH TRANSMISSION | EA |
| 10 | NOV, RANGER OILFIELD, GDS | 30174072 | JAW, UPPER ASSY ( ÜST ÇENE) | EA |
| 11 | NOV, RANGER OILFIELD, GDS | 30174073 | JAW, LOWER ASSY ( ALT ÇENE) | EA |
| 12 | NOV, RANGER OILFIELD, GDS | 30160731 | BEARING, ROLLER | EA |
| 13 | NOV, RANGER OILFIELD, GDS | M361003997 | SEAL, GARLOCK | EA |
| 14 | NOV, RANGER OILFIELD, GDS | 11379034-002 | ASSEMBLY, MANIFOLD, LH/RH SPIN | EA |
| 15 | NOV, RANGER OILFIELD, GDS | M364001027 | MOTOR, HYDRAULIC, MODIFIED | EA |
| 16 | NOV, RANGER OILFIELD, GDS | 30160612 | SW HINGE PIN LOCK | EA |
| 17 | NOV, RANGER OILFIELD, GDS | 56519-16-16-S | CONNECTOR, O – RING BOSS /37 | EA |
| 18 | NOV, RANGER OILFIELD, GDS | 56519-16-12-S | ELBOW, 90, 37 O – RING | EA |
| 19 | NOV, RANGER OILFIELD, GDS | 56557-6-6-S | ELBOW, 45, 37 O – RING | EA |
| 20 | NOV, RANGER OILFIELD, GDS | 56532-6-S-FG | ELBOW, 90, SAE O – RING | EA |
| 21 | NOV, RANGER OILFIELD, GDS | 56530-16-16-S | TEE, 37, 37, O – RING | EA |
| 22 | NOV, RANGER OILFIELD, GDS | 56529-16-12-S | CONNECTOR, O – RING BOSS /37 | EA |
| 23 | NOV, RANGER OILFIELD, GDS | 56529-12-8-S | CONNECTOR, O – RING BOSS /37 | EA |
| 24 | NOV, RANGER OILFIELD, GDS | 56525-12-12-S | TEE, SWIVEL INT 37/37/37 | EA |
| 25 | NOV, RANGER OILFIELD, GDS | 56517-16-12-S | REDUCER, INT 37/37 | EA |
| 26 | NOV, RANGER OILFIELD, GDS | 56516-12-4-S | REDUCER, TUBE END | EA |
3. Field Fault Repair Cases (Real-World Scenarios)
3.1 Case 1: Hydraulic Seal Leak (Offshore Drilling Rig)
Issue: NOV ST80C Iron Roughneck experienced hydraulic fluid leaks near the transmission, causing reduced torque output. Root cause: Degraded Garlock seal (M361003997) and loose O-ring boss fitting. Repair: Replaced the faulty seal and tightened all hydraulic connectors; pressure-tested the hydraulic system. Outcome: Eliminated leaks, restored full torque capacity, and resumed normal tubular makeup operations.
3.2 Case 2: Roller Bearing Failure (Onshore Drilling Site)
Issue: Iron roughneck produced excessive vibration and jaw misalignment during breakout. Root cause: Fatigued roller bearing (30160731) and worn guide plate. Repair: Replaced the bearing and guide plate (30170499); realigned the jaw assembly. Outcome: Eliminated vibration, restored precise jaw alignment, and extended transmission service life.
3.3 Case 3: Hydraulic Manifold Malfunction (Modular Drilling Platform)
Issue: ST80C failed to engage upper/lower jaws consistently, delaying drill pipe operations. Root cause: Faulty LH/RH spin manifold assembly (11379034-002) and clogged valve bank. Repair: Installed a new manifold assembly and cleaned the valve bank (30171609); calibrated hydraulic flow. Outcome: Restored smooth jaw operation, reduced cycle time, and resumed uninterrupted drilling workflows.
4. Frequently Asked Questions (FAQ)
| Question | Answer |
| Are these parts compatible only with the NOV ST80C Iron Roughneck? | Yes, all components in this catalog are specifically designed and sized for the NOV ST80C model; they are not interchangeable with other NOV iron roughneck models without modification. |
| Do these parts include critical components for full ST80C overhauls? | Absolutely, this catalog covers all high-wear parts: transmissions, bearings, seals, hydraulic fittings, jaw assemblies, and manifold kits for complete ST80C system overhauls. |
| How do I identify the correct hydraulic fitting part number for my ST80C? | Hydraulic fittings are labeled with SAE 37°/O-ring boss specs and unique part numbers (565 series); cross-reference the fitting type, size, and angle to the catalog listings for exact matches. |
5. Procurement Guidance & Call to Action
This NOV ST80C Iron Roughneck parts list serves as a dual-purpose industry resource: a strict procurement standard to guarantee part quality, compatibility, and compliance with API 7K drilling equipment standards, and a practical technical reference to resolve field failures quickly and safely. Choosing these OEM-equivalent replacement parts minimizes unplanned rig downtime, reduces long-term maintenance expenses, and preserves the ST80C’s industry-leading tubular handling performance.
