Product Introduction
This comprehensive National Oilwell pump parts kit encompasses all critical wear, fastener, sealing, and structural components for 630Q-8L frac pumps, including plungers, packing sets, studs, nuts, gaskets, bearings, crosshead assemblies, lubrication system parts, and specialized pump accessories. Curated for routine preventive maintenance, emergency field repairs, and full pump overhauls, this catalog serves as both a formal procurement benchmark and a hands-on technical repair guide, ensuring full compatibility with National Oilwell VARCO pump systems and eliminating fitment errors or performance gaps. All parts use industrial-grade materials — tungsten carbide for plungers, high-tensile steel for fasteners, and high-durometer elastomers for seals — to withstand harsh oilfield conditions.
Functional Specifications
- Fluid End Components: Tungsten carbide plungers (4-1/2”, 5-1/2”) and Style 838 packing sets provide abrasion resistance and leak-proof sealing under pressures up to 15,000 psi; cylinder head gaskets and stud assemblies ensure pressure-tight fluid end connections.
- Power End Assemblies: Crosshead pins, bushings, and crankshaft sleeves maintain precise mechanical alignment; heavy-duty hex nuts and studs resist vibration-induced loosening during continuous pump operation.
- Sealing & Lubrication Parts: High-durometer O-rings, lantern rings, and oil seals prevent fluid leakage and contamination; lubrication system gears, filters, and manifolds ensure consistent oil delivery to critical moving parts.
- Specialized Accessories: Pressure gauges, V-belts, and pump motors support proper pump monitoring and power transmission; shim sets and adjustment plates enable precise mechanical alignment for optimal performance.
Structural Characteristics
All National Oilwell pump parts feature a heavy-duty, field-proven design: plungers use tungsten carbide coating for superior wear resistance; fasteners comply with ASME B18.2.1 heavy-duty standards for tensile strength; seals use 90-durometer elastomers for chemical and temperature resistance (-20°F to 320°F); and structural components use forged steel for impact resistance. Each part is engraved with the official National Oilwell part number for easy inventory tracking, cross-referencing, and quality verification.
Applicable Operating Conditions
These parts are engineered for extreme high-pressure oilfield environments, including hydraulic fracturing, well cementing, acidizing, and high-pressure mud pumping. They perform reliably in corrosive fluid conditions, high cyclic loading, continuous 24/7 frac operations, and both onshore and offshore well servicing sites. Components are fully compatible with stationary and mobile 630Q-8L pump skids and other compatible National Oilwell reciprocating pumps.
Maintenance & Service Recommendations
- Preventive Maintenance Schedule: Inspect plungers, packing sets, and seals for wear every 200 operating hours; replace gaskets and O-rings every 500 hours; torque-check all studs and fasteners every 300 hours to prevent vibration loosening.
- Installation Best Practices: Lubricate seals and plungers with compatible pump oil during assembly; torque heavy-duty nuts to specified values (1-3/8-8: 220 ft-lbs, 5/8-11: 75 ft-lbs); use shim sets to maintain proper crosshead and crankshaft alignment.
- Troubleshooting Tips: Resolve fluid leaks by replacing worn packing sets or O-rings; fix mechanical noise by inspecting crosshead bushings and alignment; address lubrication issues by replacing filters and checking manifold flow.
We supply the following spare parts:
| ITEM | DESCRIPTIONS | UM | BRAND |
| 1 | STUD (ESPARRAGO). N/P 16-3000-12 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 2 | 1-3/8-8 SF HEAVY HEX NUT (TUERCA HEXAGONAL SERVICIO PESADO). N/P 75-511-754 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 3 | STUD 1-8UNC (ESPARRAGO). N/P 10-000-185 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 4 | PLATED ALLEN NUT (TUERCA ALLEN, GALVANIZADA). N/P 75-513-523 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 5 | CYLINDER HEAD & VALVE COVER GASKET (EMPAQUE PARA CUBIERTA DE VÁLVULA). N/P 16306010 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 6 | 5/8-11 HVY. HEX NUT (TUERCA HEXAGONAL PARA SERVICIO PESADO). N/P 75-510-310 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 7 | 4-1/2 STUFFING BOX BUSHING. (BUJE DE LA CAJA DE EMPAQUES). N/P 16-524-033 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 8 | 4-1/2 PACKING FOLLOWER (ANILLO DE RETENCIÓN). N/P 16-526-031 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 9 | 4-1/2 LANTERN RING (ANILLO LINTERNA). N/P 16-511-032 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 10 | STUFFING BOX GLAND 4-1/2 (MANGUITO). N/P 16-325-003 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 11 | 1/4″ X 3″ X. H. SMLS. PIPE NIPPLE (NIPLE). N/P 78-420-009 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 12 | FRAME END GASKET (EMPAQUE DEL EXTREMO MECÁNICO). N/P 16-493-260 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 13 | SQUARE HEAD BOLT (PERNO CABEZA CUADRADA). N/P 16-247-001 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 14 | 5/32 X 2 COTTER PIN (CHAVETA). N/P 75-103-008 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 15 | CROSSHEAD PIN RETAINIG PLATE (PERNO RETENEDOR DE LA PLACA DE LA CRUCETA). N/P 16-483-700 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 16 | 5/8 – 11X 1 1/4 DRILLED HEAD CAPSCREW (TORNILLO CABEZA PERFORADA). N/P 45-143-802 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 17 | NO. 16 GAUGE LOCKING WIRE (ALAMBRE CALIBRE 16). N/P 59-8000-16 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 18 | CROSSHEAD PIN (PERNO DE LA CRUCETA). N/P 16-139-000 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 19 | CROSSHEAD PIN BUSHING. (BUJE DE LA CRUCETA). N/P 16-484-020 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 20 | OIL BAFFLE (RETEN PARA ACEITE). N/P 16-341-002 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 21 | CRADLE COVER STEEL (FUNDA CUNA DE ACERO). N/P 16-327-029 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 22 | DIAPHRAGM HOUSING (INCLUYE ÍTEMS 49-002-925, 75-509-994) (DIAFRAGMA). N/P 16-566-005 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 23 | STUD 1/2-13 (ESPARRAGO). N/P 49-002-925 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 24 | 1/2-13 HEAVY HEX NUT (TUERCA HEXAGONAL PESADA). N/P 150-012013-278 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 25 | DIAPHRAGM WASHER (ARANDELA DIAFRAGMA). N/P 16-566-010 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 26 | SHIM SET (0.031″ THICK EACH SET) (LAINA DE AJUSTE). N/P 16-566-008 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 27 | DIAPHRAGM GLAND (GLÁNDULA DEL DIAFRAGMA). N/P 15-566-009 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 28 | WIPER RING (RETEN DE ACEITE). N/P 15-566-002 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 29 | LANTERN RING (ANILLO LINTERNA). N/P 16-566-012 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 30 | OIL SEAL (RETEN DE ACEITE). N/P 68-630-409 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 31 | 1X1-1/2X7-7/16 KEY (CUÑA). N/P 16-342-003 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 32 | CRANKSHAFT SLEEVE (MANGUITO DE FLECHA). N/P 16-484-250 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 33 | OIL SEAL (SELLO DE ACEITE). N/P 68-630-925 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 34 | OIL SEAL (RETEN DE ACEITE). N/P 68-630-375 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 35 | 5/8 – 11 X 2 DRILLED HEAD CAPSCREW (TORNILLO PERFORADO). N/P 45-143-503 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 36 | 3/16 X 3/16 X 1 KEY (CUÑA). N/P 45-124-506 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 37 | 5/16 – 18 X 1/2 SOCKET HEAD CUP POINT SET SCREW (TORNILLO DE AJUSTE DE PUNTA DE COPA DE CABEZA HUECA). N/P 75-634-046 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 38 | ROTORSEAL (SELLO DEL ROTOR). N/P 06-001-857 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 39 | LUBRICATOR DRIVE SHEAVE GASKET (EMPAQUE DE LA POLEA DEL LUBRICADOR). N/P 16-785-004 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 40 | 3/8 – 16 X 1 – 3/4 SOCKET HEAD CAPSCREW (TORNILLO DE CABEZA DE VASO). N/P 75-635-598 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 41 | ROTORSEAL GASKET (EMPAQUE DEL SELLO DEL ROTOR). N/P 06-001-803 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 42 | OIL PUMP GASKET (EMPAQUE DE LA BOMBA DE ACEITE). N/P 16-496-060 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 43 | FILTER CARTRIDGE ONLY (FRAM CH-33APL OR EQUAL) (FILTRO DE ACEITE). N/P 64-212-140 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 44 | 3/4″ X 13-1/2″ HOSE ASSEMBLY (MANGUERA, ENSAMBLE). N/P 16-496-077 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 45 | 3-1/2″ PRESSURE GAUGE** (MANÓMETRO). N/P 78-255-050 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 46 | LUBRICATOR BELT GUARD (L.H) BANDA PARA BOMBA DE LUBRICACIÓN. N/P 16-385-014 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 47 | A-60 V-BELT (BANDA PARA BOMBA DE LUBRICACIÓN). N/P 68-020-060 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 48 | 5/8-11X1 1/4 CAPSCREW (TORNILLO). N/P 75-634-363 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 49 | 1-1/2″ AIR BREATHER (RESPIRADOR) N/P 64-229-100 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 50 | MAGNET ASSEMBLY (MAGNETO DEL EXTREMO MECÁNICO). N/P 88-02-047 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 51 | 3/4-10 X 2 CAPSCREW TORNILLO). N/P 75-634-382 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 52 | 5/8 – 11 X 3/4 HEX H.D. FINISH SCREW (TORNILLO CUERDA FINA). N/P 10-025-485 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 53 | OIL PUMP DRIVE GEAR (22 TEETH) (ENGRANAJE IMPULSOR DE BOMBA DE 22 DIENTES). N/P 16-376-000 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 54 | OIL PUMP DRIVE GEAR (99 TEETH) (ENGRANAJE IMPULSOR DE BOMBA DE 99 DIENTES). N/P 16-375-000 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 55 | 3/4 – 10 X 2-3/4 CAPSCREW (TORNILLO). N/P 75-634-385 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 56 | 7 P.D. 1-A SECTION SHEAVE (W/1″ – 14 NF THD) POLEA N/P 16-785-003 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 57 | OIL FEED MANIFOLD (MANIFOLD DE ALIMENTACIÓN DE ACEITE). N/P 16-300-033 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 58 | 4 P.D. 1-A SECTION SHEAVEF / 5/8″ (POLEA PARA BOMBA DE LUBRICACIÓN). N/P 68-650-430 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 59 | LAINAS DE AJUSTE (LAINA DE ALINEACIÓN). N/P 16-485-125 MARCA NATIONAL OILWELL | JGO | OILWELL |
| 60 | DIAPHRAGM GASKET (JUNTA DE DIAFRAGMA). N/P 16-486-660 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 61 | MOTOBOMBA MISION MAGNUM, MARCA NATIONAL OILWELL VARCO, DE 3X2X13, NP: 64020213IT34 | PZA | OILWELL |
| 62 | 1 1/8- 8 HEAVY HEX NUT No. DE PARTE 75-511-750 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 63 | 1 1/8- 8 X 4 3/4 STUD No. DE PARTE 311-118434-286 MARCA NATIONAL OILWELL (CANCELA Y REEMPLAZA No. DE PARTE 15-371-949) | PZA | OILWELL |
| 64 | 1 3/8/- 8 X 3 3/4 STUD No. DE PARTE 104-100334-286 MARCA NATIONAL OILWELL (CANCELA Y REEMPLAZA No. DE PARTE 10-000-185) | PZA | OILWELL |
| 65 | 1 3/8/- 8 X 5 3/4 STUD No. DE PARTE 16-300-012 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 66 | 1/4″ F.S. COUPLING No. DE PARTE 78-105-002 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 67 | 1/4″ X 1/8″ F.S. BUSHING No. DE PARTE 78-069-001 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 68 | 1/4X3 X.H: SEAMLESS PIPE NIPPLE No. DE PARTE 158-014300-551 MARCA NATIONAL OILWELL (CANCELA Y REEMPLAZA No. DE PARTE 78-420-009 ) | PZA | OILWELL |
| 69 | 1-8 ALLEN NUT (CAD. PLATED) No. DE PARTE 471-100008-286 MARCA NATIONAL OILWELL (CANCELA Y REEMPLAZA No. DE PARTE 75-513-523) | PZA | OILWELL |
| 70 | 1-8 HEAVY , HEX NUT No. DE PARTE 133-100008-286 MARCA NATIONAL OILWELL (CANCELA Y REEMPLAZA No. DE PARTE 75-510-316) | PZA | OILWELL |
| 71 | 1-8 X 4 1/4″ STUD No. DE PARTE 104-100414-286 MARCA NATIONAL OILWELL (CANCELA Y REEMPLAZA No. DE PARTE 45-810-005) | PZA | OILWELL |
| 72 | 3/8/- 8 HEAVY, HEX NUT No. DE PARTE 75-511-754 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 73 | 5 1/2 PLUNGER, TUNGSTEN CARBIDE No. DE PARTE 16-212-005-E47 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 74 | 5 1/2 FOLLOWER GLAND No. DE PARTE 16-526-037 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 75 | 5 1/2″ PACKING SET STYLE 838 No. DE PARTE 16-315-007 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 76 | 5 1/2″ PLGR No. DE PARTE 16-511-037 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 77 | 5 1/2″ BUSHING, STUFFING BOX No. DE PARTE 16-524-040 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 78 | 5 1/2″ GLAND No. DE PARTE 16-325-004 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 79 | 5 1/4-5 1/2 STUFFING BOX, NAB No. DE PARTE 16-323-006 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 80 | 5/8 -11 HEX NUT No. DE PARTE 100-058600-290 MARCA NATIONAL OILWELL (CANCELA Y REEMPLAZA No. DE PARTE 75-074-694) | PZA | OILWELL |
| 81 | 5/8″-11 HEAVY HEX NUT 133-058011-286 No. DE PARTE 75-510-310 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 82 | 5/8″-11 X 71/2 CAPSCREW No. DE PARTE 75-068-060 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 83 | 5/8-11 HEX NUT (S.S) No. DE PARTE 75-510-438 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 84 | CYLINDER HEAD & VALVE COVER No. DE PARTE 16-306-009 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 85 | CYLINDER HEAD ADAPTER RING No. DE PARTE 16-306-014 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 86 | PLUNGER EXTENSIÓN ROD No. DE PARTE 16-484-101 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 87 | FLUID BAFFLE No. DE PARTE 16-004-190 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 88 | FLUID END STUDDED No. DE PARTE 16-300-018 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 89 | GASKET, CYLINDER HEAD & VALVE COVER No. DE PARTE 16-306-010 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 90 | GLAND PAWL No. DE PARTE 16-525-000 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 91 | O’RING No. DE PARTE 99-607-437 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 92 | PLUNGER CLAMP COMPLETE INCLUYE ÍTEM 13 Y 14, No. DE PARTE 20-150-132 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 93 | SUCTION MANIFOLD No. DE PARTE 16-300-030 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 94 | SUCTION MANIFOLD GASKET No. DE PARTE 16-300-031 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 95 | MOTOBOMBA DE SISTEMA DE ENFRIAMIENTO, INCLUYE MOTOR ELÉCTRICO Y COPLE. N/P 99-001-011, MARCA NATIONAL OILWELL | PZA | OILWELL |
| 96 | CROSSHEAD (CRUCETA). N/P 16-335-002 MARCA NATIONAL OILWELL | PZA | OILWELL |
| 97 | 4-1/2 CO-HARD PLUNGER, TC, CLMP (EMBOLO, TIPO CLAMP, 4 1/2 “PULG. DIAM, CARBURO DE TUNGSTENO). N/P 16-001-206, PARA MOTOBOMBAS REFORZADORAS MODELO 630Q-8L. | PZA | OILWELL |
| 98 | 4-1/2 PACKING SET (JUEGO DE EMPAQUES DE EMBOLO). N/P 16-315-003, PARA MOTOBOMBAS REFORZADORAS |
Field Failure Repair Cases
Case 1: Plunger Packing Seal Blowout
A National Oilwell 630Q-8L pump experienced severe fluid leakage during a fracturing job, caused by a degraded 4-1/2” Style 838 packing set. Replacing the worn packing set and installing a new lantern ring eliminated leaks, restoring full pump pressure and resuming operations within 2 hours.
Case 2: Stud Fatigue & Fluid End Leak
A pump developed a high-pressure leak at the cylinder head due to fatigued 1-3/8-8 studs. Replacing the worn studs and corresponding heavy hex nuts, plus re-seating the cylinder head gasket, fixed the pressure loss and prevented further structural damage.
Case 3: Crosshead Bushing Wear
A 630Q-8L pump exhibited excessive mechanical vibration and uneven plunger wear, traced to worn crosshead pin bushings. Installing new OEM bushings and realigning the crosshead assembly restored smooth operation and extended plunger service life.
Frequently Asked Questions (FAQ)
| Question | Answer |
| Are these parts compatible only with the National Oilwell 630Q-8L pump? | These OEM parts are primarily designed for the 630Q-8L frac pump and are also compatible with select other National Oilwell reciprocating pumps; verify part numbers against your pump’s service manual for exact fitment. |
| What material grade is used for the plunger components? | The plungers feature a tungsten carbide (TC) coating, a high-abrasion-resistant material that extends service life by 40% compared to standard steel plungers in harsh fracturing service. |
| Do these parts meet official oilfield industry standards? | Yes, all components comply with API 6A and API 7K standards, the leading industry specifications for high-pressure oilfield pumping equipment, ensuring safety and performance compliance. |
Procurement Guidance & Closing Call to Action
For oilfield operations relying on National Oilwell 630Q-8L and compatible frac pumps to deliver consistent high-pressure performance, this parts list serves as a definitive procurement standard and trusted technical repair reference. Investing in genuine OEM National Oilwell pump parts eliminates the significant risks of inferior aftermarket components — including premature failure, costly job delays, and safety hazards — while ensuring full compliance with strict oilfield equipment standards.
