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  3. UNIJIN UJP251D05008010

UNIJIN UJP251D05008010 Dial Oil Filled Internals Kp Water 850024812277 Pressure Gauge 0-10 Psi/kp

Ujp251d05008010 Unijin P251 Series 2 Inch Dial Oil Filled Pressure Gauge With Brass Internals 0-10 Psi/kp

( Brand: Unijin ), ( Manufacturer Part Number: UJP251D05008010 ), ( Part Type: Oil Pressure Gauge ), ( Included Components: Presure Gauge ), ( Size: 1/4 Npt ), ( Style: 0-10 Psi ), ( Measurement Accuracy: /-1.6 ), ( Model Number: P251 Series ), ( Thread Type: Npt ), ( Material: Stainless Steel ), ( UPC: 850024812277 ), ( Package Dimensions Lxwxh: 2.68x2.6x2.52 Inches ), ( Weight: 0.35 Pounds )

Review UNIJIN Series Inch Dial Oil Filled Pressure Gauge Brass Internals 0-10 Psi/kp

The **UniJin UJP251D05008010 P251 Dial Oil-Filled Pressure Gauge Internals (0-10 psi/kPa)** represents a precision-engineered, high-performance internal assembly designed for reliable and accurate pressure measurement in fluid systems, particularly where oil-based or hydraulic applications are prevalent. This component is a critical part of a **bourdon tube pressure gauge**, a robust and widely trusted mechanism for monitoring low-pressure ranges, specifically calibrated to measure pressures from **0 to 10 psi (0 to approximately 68.95 kPa)**. The internal assembly features a **sealed, oil-filled bourdon tube**, a coiled, hollow metal tube that responds to pressure changes by uncoiling proportionally. This design ensures smooth, hysteresis-free operation, minimizing lag and providing consistent readings even in dynamic or fluctuating pressure environments. The oil filling within the tube acts as a damping agent, reducing vibration-induced errors and enhancing the gauge s stability, making it ideal for applications where precision and durability are paramount, such as in automotive hydraulic systems, industrial machinery lubrication circuits, or pneumatic testing setups.

At the core of this internal assembly is a **gear-and-sector mechanism**, which translates the linear movement of the bourdon tube into rotational motion, driving the gauge s needle across the calibrated dial. The **pivoting spindle and hairpin spring** assembly ensures minimal friction, allowing for accurate and responsive readings while maintaining long-term reliability. The **dial face**, though not part of the internal assembly itself, interfaces directly with these components, and the internal mechanism is designed to accommodate standard gauge mounting styles, ensuring compatibility with a wide range of housing designs. Constructed from high-grade materials likely **brass, stainless steel, or alloy steel** the internals are engineered to withstand repeated pressure cycles, temperature variations, and exposure to corrosive fluids, making them suitable for both indoor and outdoor industrial applications. Additionally, the sealed oil filling not only dampens oscillations but also protects the internal components from moisture, dust, and contaminants, extending the gauge s operational lifespan.

For technicians or engineers working with hydraulic systems, this internal assembly is a **drop-in replacement** for standard P251 pressure gauges, offering a cost-effective solution for upgrading or repairing existing instrumentation without compromising performance. Its compact yet robust design ensures easy integration into existing setups, while its **0-10 psi range** makes it particularly well-suited for applications where low-pressure monitoring is critical, such as in **oil-filled hydraulic systems, lubrication circuits, or pneumatic testing equipment**. Whether used in automotive service bays, manufacturing plants, or research laboratories, the **UniJin UJP251D05008010 internals** deliver the precision, durability, and reliability required for dependable pressure measurement in demanding environments.

### Pros and Cons of buying a Unijin UJP251D05008010 P251 Dial Oil-Filled Pressure Gauge Internals (0-10 psi/kPa)

#### **Pros:**

1. **High Accuracy and Precision** Oil-filled pressure gauges are designed to provide stable readings over time, minimizing fluctuations caused by temperature changes or vibration. This makes them ideal for applications requiring consistent monitoring, such as HVAC systems, automotive diagnostics, or industrial processes.

2. **Durability and Longevity** The oil-filled mechanism reduces internal friction and wear, extending the gauge s lifespan compared to standard dry gauges. This is particularly useful in environments where frequent pressure changes occur.

3. **Temperature Resistance** Oil damping helps mitigate the effects of temperature variations, ensuring more accurate readings in fluctuating thermal conditions. This is beneficial in outdoor or industrial settings where temperature swings are common.

4. **Smooth Operation** The oil-filled system reduces jerky or erratic needle movement, providing a more stable and readable display. This is especially useful for applications requiring precise adjustments or monitoring.

5. **Compatibility with Various Fluids** Since this is an internal assembly for a pressure gauge, it can be paired with a suitable dial face to measure oil, water, gas, or other compatible fluids, depending on the application.

6. **Cost-Effective Replacement** If the original gauge fails, replacing just the internals (rather than the entire unit) can be more economical than purchasing a new gauge, especially for specialized or high-end models.

7. **Easy Installation** Replacing internals typically involves removing the old assembly and installing the new one with minimal tools, making it a straightforward DIY repair for those with basic mechanical skills.

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#### **Cons:**

1. **Limited Range** The gauge is rated for a very low pressure range (0-10 psi/kPa), which may not be suitable for high-pressure applications. If you need to measure higher pressures, this part will not be functional without modification or pairing with an incompatible dial.

2. **Potential for Oil Leakage** Over time, the oil seal may degrade, leading to leaks that can damage the gauge mechanism or contaminate the system being monitored. This risk increases with age or improper handling.

3. **Compatibility Issues** The internals must match the correct gauge housing and dial face. Mismatched parts can lead to improper sealing, inaccurate readings, or mechanical failure. Ensure the housing and dial are compatible before purchasing.

4. **Specialized Knowledge Required** While replacement is relatively simple, improper installation (e.g., incorrect torque on fittings or misalignment of components) can render the gauge useless or even damage the system. Those without experience may need professional assistance.

5. **No Built-In Protection Features** Unlike some industrial gauges, this internal assembly lacks built-in overpressure protection or burst-disc mechanisms. Exceeding the 10 psi limit could damage the gauge irreparably.

6. **Limited Availability of Spare Parts** If the gauge requires additional components (e.g., seals, mounting hardware) beyond the internals, sourcing them may be difficult, especially for older or less common models.

7. **Potential for Calibration Drift** Even with oil damping, gauges can experience drift over time due to wear or environmental factors. Periodic recalibration may be necessary for critical applications.

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### **Conclusion:**

The Unijin UJP251D05008010 pressure gauge internals are a practical and cost-effective solution for replacing or repairing a low-range (0-10 psi/kPa) oil-filled pressure gauge. They offer superior stability, durability, and temperature resistance compared to standard gauges, making them ideal for applications where accuracy and longevity are priorities. However, their narrow pressure range and potential for oil leakage or compatibility issues mean they are best suited for specific, low-pressure applications rather than high-demand or high-pressure systems.

For users with basic mechanical skills and access to compatible gauge housings and dials, replacing internals is a viable and economical repair option. Those without experience should proceed cautiously or seek professional help to avoid further damage. If the gauge is used in a critical system (e.g., medical, aerospace, or high-precision industrial applications), verifying the gauge s calibration and considering additional protective measures (e.g., pressure regulators or safety valves) is advisable.

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### **Recommendation:** Purchase the Unijin UJP251D05008010 internals if:

- You are repairing an existing 0-10 psi oil-filled gauge and have confirmed compatibility with your housing and dial.

- The gauge is used in a low-pressure application where stability and durability are important (e.g., HVAC, automotive diagnostics, or light industrial processes).

- You are comfortable with basic installation or have access to technical guidance.

Avoid purchasing if:

- You need a gauge for high-pressure applications (this part is not suitable for pressures above 10 psi).

- You lack the tools, knowledge, or confidence to install the internals correctly.

- The gauge housing or dial is damaged or incompatible, as this could void the repair s effectiveness.

- You require additional features like overpressure protection or burst-disc mechanisms, which are not included in this internal assembly.

For long-term reliability, consider investing in a high-quality, calibrated gauge from a reputable brand if replacements are frequent. If this is a one-time repair, the Unijin internals offer a solid, budget-friendly option for extending the life of your existing gauge.

Details:

part #: ujp251d05008010 prices

  • $8.00-$24.92

specifications pressureswitchiz:

  • brand: Unijin
  • mpn: Ujp251d05008010
  • part type: Oil Pressure Gauge
  • included components: Presure Gauge
  • size: 1/4 Npt
  • style: 0-10 Psi
  • measurement accuracy: /-1.6
  • model number: P251 Series
  • thread type: Npt
  • material: Stainless Steel
  • upc: 850024812277
  • package dimensions lxwxh: 2.68x2.6x2.52 Inches
  • weight: 0.35 Pounds

general pressureswitchiz:

  • Business Industrial > Hydraulics, Pneumatics, Pumps Plumbing > Air Pressure Gauges
  • condition: New

offer pressureswitchiz:

  • quantity: 1
  • started: March 3, 2026
  • sold: 0
  • options: Ship-to-home
  • availability: In Stock

payments pressureswitchiz:

  • other
  • credit card: Diners-club
  • wallet: Apple-pay

returns pressureswitchiz:

  • paid by: Seller
  • policy: Returns Accepted
  • method: Money back
  • time: 30 Days

seller pressureswitchiz:

  • city: Phoenix, Arizona
  • rating: 100.0%
  • # reviews: 3128

shipping pressureswitchiz:

  • transit: 8-14 Days
  • service: Standard
  • type: Fixed
  • class: Standard
  • cost: $0.00
part type: oil pressure gauge, included components: presure gauge, size: 1/4 npt, style: 0-10 psi, measurement accuracy: /-1.6, model number: p251 series, thread type: npt, package dimensions lxwxh: 2.68x2.6x2.52 inches,
category: business & industrial > hydraulics, pneumatics, pumps plumbing > air pressure gauges, color: 0-10 psi, weight: 0.35 pounds, material: stainless steel, sku: 17634430943596983,
Unijin UJP251D05008010 Is Similar To:
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2 offers $8.00–$24.92 USD
  • New. Offer #1 priced at $24.92 + $0.00 shipping estimate = $24.92* total. Liquid filled dampens vibration effectively and lubricates delicate parts of the gauge for long lasting use. Model Series.FREE SHIPPING
  • New. Offer #2 priced at $8.00 + $10.00 shipping estimate = $18.00* total. +$10.00 shipping

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