The 803591374 Adapter is a genuine OEM thread conversion fitting manufactured by XCMG for motor graders and heavy construction equipment. This precision adapter converts a 1/8-27 NPTF internal thread to an M10×1 external thread, enabling seamless integration of sensors and components with mismatched thread standards.
Engineered from high-grade brass with nickel plating, the 803591374 adapter withstands extreme pressure, vibration, and thermal cycling in demanding environments. It directly connects sensors with 1/8-27 NPTF threads into ports with M10×1 female threads.
Each unit is factory-tested to ensure leak-free performance up to 150 psi, making it ideal for temperature senders, pressure transducers, and fluid monitoring systems on XCMG GR series graders and compatible machinery.
| Parameter | Specification |
|---|---|
| OEM Number | 803591374 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Thread Adapter / Thread Reducer |
| Internal Thread (Sensor Side) | 1/8-27 NPTF (National Pipe Taper Fuel) |
| External Thread (Port Side) | M10 × 1 (Metric Fine Thread) |
| Material | High-Grade Brass with Nickel Plating |
| Maximum Operating Pressure | 150 psi (10.3 bar) – 250 psi burst |
| Maximum Torque (Installation) | 7 Nm (62 in-lbs) |
| Temperature Range | -40°C to +125°C (-40°F to +257°F) |
| Media Compatibility | Engine oil, coolant, transmission fluid, diesel fuel, hydraulic oil |
| Sealing Mechanism | Tapered NPTF thread (dry seal, no O-ring required) |
| Corrosion Resistance | Nickel-plated brass (500+ hours salt spray resistance) |
| Hex Size (Wrench) | 14 mm (0.55 in) across flats |
| Overall Length | Approximately 18 mm (0.71 in) |
| Weight | Approximately 25 grams (0.88 oz) |
| Compatible Sensor Threads | 1/8-27 NPTF male sensors (temperature, pressure, oil senders) |
| Compatible Port Threads | M10×1 female ports (engine blocks, manifolds, adapters) |
| Standards | SAE J476, ISO 1179, DIN 3852 |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350 motor graders; also fits XCMG loaders, rollers, and excavators |
The XCMG 803591374 Adapter bridges the gap between two common thread standards found on heavy equipment. Many temperature senders, oil pressure sensors, and fluid switches use 1/8-27 NPTF threads, while engine blocks, transmission housings, and hydraulic manifolds often feature M10×1 ports.
Instead of replacing entire sensors or modifying expensive castings, the 803591374 adapter provides an elegant solution. Simply thread the adapter into the M10×1 port, then install your 1/8-27 NPTF sensor into the adapter. The result is a reliable, leak-free connection that maintains full sensor accuracy.
This adapter is especially useful when retrofitting aftermarket gauges or replacing obsolete sensors where only metric-thread replacements are available. XCMG engineers designed the 803591374 to meet the exact thread tolerances and sealing requirements of their motor grader powertrains.
The 803591374 features NPTF (National Pipe Taper Fuel) threads, also known as Dryseal threads. Unlike standard NPT threads, NPTF threads are designed to create a leak-proof seal without thread sealant or Teflon tape, relying on controlled thread crest and root interference.
This makes the 803591374 adapter ideal for high-vibration applications where sealant can degrade or loosen. The tapered design ensures that as you tighten the adapter, the threads wedge together, creating a metal-to-metal seal that withstands pressure spikes and thermal cycling.
However, for added security in critical fluid systems (engine oil, fuel), XCMG recommends applying a small amount of thread sealant or PTFE paste. Never use Teflon tape on NPTF threads, as it can interfere with the dry-seal interference and potentially shred into the fluid system.
Each XCMG 803591374 adapter is CNC-machined from high-grade brass billet, then nickel-plated for superior corrosion resistance. The machining process holds thread pitch diameter tolerances within ±0.05 mm, ensuring consistent engagement with both NPTF and metric sensors and ports.
XCMG subjects every batch to rigorous quality tests: thread gauge verification (GO/NO-GO), pressure testing to 250 psi (burst pressure), and salt spray testing per ASTM B117 for 500 hours with no visible corrosion. This ensures the adapter performs flawlessly even in mining, coastal, or winter road maintenance environments.
The hexagonal center section provides a positive gripping surface for a 14 mm wrench or socket, allowing precise torque application without damaging the threads. The maximum recommended installation torque is 7 Nm (62 in-lbs) – exceeding this can strip the adapter or distort the threads.
Aftermarket adapters often use low-grade brass or aluminum that corrodes or strips after a few months. The genuine XCMG part is manufactured to the same standards as the original equipment on your motor grader. The nickel plating resists galvanic corrosion when installed in aluminum or steel ports.
Counterfeit adapters may have incorrect thread lead or taper angle, leading to cross-threading or leaks. The 803591374 is 100% thread-gauged to ANSI B1.20.3 for NPTF and ISO 261 for M10×1, guaranteeing a perfect fit every time.
XCMG provides a 12-month warranty against manufacturing defects. Each adapter is laser-etched with the XCMG logo and part number for traceability. This supersedes older numbers 803591201, 803591288, and 803591312.
Installing the 803591374 adapter is straightforward. First, clean both the M10×1 port and the adapter threads. Apply a small amount of PTFE thread sealant or anaerobic pipe sealant to the M10×1 external threads (the adapter’s male side). Do not apply sealant to the NPTF internal threads unless specified.
Thread the adapter into the M10×1 port by hand until snug, then tighten with a 14 mm wrench to 7 Nm maximum. Next, thread your 1/8-27 NPTF sensor into the adapter by hand, then tighten 1 to 1.5 turns past finger-tight for proper NPTF sealing. Over-tightening can crack the adapter or sensor housing.
After installation, pressurize the system and check for leaks. If minor weeping occurs, tighten the adapter an additional 1/8 turn. If leaking persists, remove and inspect for debris or damaged threads. Never exceed 10 Nm of total torque on the adapter.
On XCMG GR series motor graders, the 803591374 adapter is frequently used to install aftermarket oil pressure gauges, coolant temperature senders, and transmission pressure sensors. Many engine blocks have M10×1 ports, while standard automotive sensors use 1/8-27 NPTF – this adapter makes them compatible.
Other applications include hydraulic pressure test ports, fuel pressure monitoring, and turbo boost gauge installations. The adapter’s compact design (only 18 mm long) allows installation in tight engine bay areas where bulky reducers would not fit.
For fleet managers, stocking the 803591374 adapter simplifies inventory. Instead of carrying both NPTF and metric sensors, you can stock one sensor type and use adapters to fit any port. This reduces spare parts costs and eliminates delays waiting for the correct sensor thread.
The 803591374 Adapter is stocked in XCMG distribution centers in North America, Europe, Asia, and the Middle East. Standard air freight delivers within 3-7 business days worldwide. Expedited shipping (1-2 days) is available for urgent repairs.
Bulk orders (10+ pieces) receive discounted pricing and can be shipped via sea freight. Each adapter is individually sealed in an anti-static bag with desiccant. For large fleets or mining operations, consignment stock programs are available to ensure immediate availability.
Don’t compromise with generic adapters that fail under pressure. Choose the genuine XCMG 803591374 for guaranteed thread compatibility, leak-free sealing, and long service life. Keep your motor grader’s sensors connected and accurate.
The 803591374 adapter is an essential component for any XCMG motor grader maintenance kit. Whether you are installing new sensors, replacing damaged fittings, or retrofitting monitoring equipment, this precision adapter ensures reliable thread conversion without leaks or cross-threading.
Order the genuine XCMG 803591374 1/8-27 NPTF to M10×1 Adapter today and experience OEM-quality fit and finish. Precision engineered for the toughest jobsites – from mining operations to highway construction – this adapter delivers years of trouble-free service.
