SMC 434376 Rings Kit PKH-PR402H0001 100MM

( Brand: Smc ), ( Manufacturer Part Number: 434376 ), ( Model: PKH-PR402H0001 ), ( Part Type: Ring )

Review SMC Genuine Replacement Kit O rings 100mm Bore

The **SMC 434376 PKH-PR402H0001 Kit of O-Rings (100mm)** is a high-performance sealing solution meticulously engineered for demanding pneumatic and hydraulic applications within industrial automation, robotics, and precision machinery. This comprehensive kit features a collection of **high-quality nitrile-butadiene rubber (NBR) o-rings**, specifically designed to deliver exceptional resistance against abrasion, oil, fuel, and a wide range of hydraulic fluids while maintaining reliable sealing integrity under fluctuating pressure conditions. Each o-ring in this kit adheres to strict dimensional tolerances, ensuring a precise fit within SMC s **PKH-PR402H series** of pneumatic cylinders, valves, and actuators, where consistent performance is critical for operational efficiency. The **100mm diameter** specification makes this kit ideal for larger-scale applications, such as heavy-duty robotic arms, CNC machining systems, or automated assembly lines where sealing reliability directly impacts productivity and safety. Constructed from a durable elastomer compound, these o-rings exhibit superior resilience against temperature extremes, chemical exposure, and mechanical stress, reducing the risk of premature wear or failure in high-cycle environments. The kit s modular design allows for easy installation and replacement, minimizing downtime during maintenance, while its compatibility with SMC s advanced pneumatic systems ensures seamless integration with existing automation setups. Whether deployed in cleanroom environments, outdoor industrial settings, or high-vibration applications, this o-ring kit exemplifies SMC s commitment to precision engineering and long-term durability, providing engineers and technicians with a dependable sealing solution for the most rigorous operational demands.

### **Pros and Cons of buying a SMC 434376 PKH-PR402H0001 Kit (O-Rings, 100mm)**

#### **Pros**

1. **Compatibility and Fit** This kit is specifically designed for SMC pneumatic cylinders, particularly the PKH series (e.g., PKH-PR402H). The O-rings are engineered to match the cylinder s internal dimensions, reducing the risk of leaks or premature wear. Proper sealing ensures efficient operation and longevity of the pneumatic system.

2. **High-Quality Materials** SMC is a reputable manufacturer known for producing durable, high-performance pneumatic components. The O-rings in this kit are likely made from nitrile rubber (NBR) or similar synthetic elastomers, which offer excellent resistance to oil, grease, and compression set. This ensures reliable sealing even under fluctuating pressures and temperatures.

3. **Pre-Assembled Convenience** The kit includes a set of O-rings (likely for piston rod, piston, and rod guide), which means you don t have to source individual parts separately. This simplifies maintenance or replacement tasks, saving time and reducing the chance of mismatched components.

4. **Cost-Effective for Maintenance** Replacing worn O-rings is a common maintenance requirement for pneumatic cylinders. Buying this kit upfront (rather than reacting to failures) can prevent unexpected downtime and costly repairs. It also avoids the hassle of sourcing parts from multiple suppliers.

5. **Extended Equipment Lifespan** Properly sealed cylinders experience less friction and contamination, which reduces wear on internal components like seals, bearings, and rods. This contributes to the overall longevity of the pneumatic system, delaying the need for major overhauls.

6. **Easy Installation** The O-rings are typically designed to fit snugly into grooves within the cylinder. With the correct lubrication (if required), installation is straightforward and doesn t require specialized tools or expertise, making it accessible for in-house maintenance teams.

7. **Warranty and Support** Purchasing from an authorized SMC distributor or dealer may include warranty coverage or access to technical support. This can be valuable if installation issues or compatibility concerns arise.

---

#### **Cons**

1. **Limited Use Case** This kit is **exclusively for the SMC PKH-PR402H series** (or very similar models). If you have a different cylinder brand or model (e.g., Festo, Bosch Rexroth, or another SMC series like PKH-PR402), these O-rings will not be compatible. Mixing brands can lead to leaks, damage, or voided warranties.

2. **Potential Overkill for Light-Duty Systems** If your application involves very low-pressure or non-abrasive environments, these O-rings may be more robust than necessary. Over-engineering could lead to unnecessary costs without additional benefits.

3. **Compatibility with Lubrication Requirements** Some SMC cylinders require specific lubricants for optimal O-ring performance. Using the wrong lubricant (e.g., silicone-based instead of mineral oil-compatible) can degrade the rubber, reducing seal effectiveness. Always verify compatibility with your system s lubrication protocol.

4. **Single-Source Dependency** Relying on SMC for O-rings means you re locked into their supply chain. If SMC discontinues this part or faces supply chain disruptions (e.g., during global shortages), finding replacements could become difficult. Generic O-ring suppliers may offer alternatives, but they risk compromising performance or fit.

5. **Cost Relative to Generic Alternatives** While SMC O-rings are high-quality, they may be more expensive than generic O-rings from other brands (e.g., Parker, Johnstone, or local manufacturers). For non-critical applications, generic O-rings could suffice at a lower cost, though with slightly reduced performance guarantees.

6. **Storage and Shelf Life** O-rings can degrade over time if exposed to UV light, ozone, or extreme temperatures. If stored improperly, they may become brittle or lose elasticity before installation. Ensure the kit is stored in a cool, dry place away from direct sunlight.

7. **Potential for Misuse** If the O-rings are not installed correctly (e.g., twisted, improperly seated, or over-stretched), they can fail prematurely. Improper installation may also damage the cylinder s internal grooves, requiring additional repairs.

---

### **Conclusion**

The **SMC 434376 PKH-PR402H0001 O-Ring Kit (100mm)** is a **highly specialized, reliable, and convenient** solution for maintaining or replacing O-rings in compatible SMC pneumatic cylinders. Its primary strengths lie in **sealing performance, compatibility, and ease of use**, making it ideal for industrial applications where leaks or downtime cannot be tolerated. The kit s quality and engineering justify its cost for users who prioritize longevity and efficiency in their pneumatic systems.

However, the **niche applicability** and **potential over-engineering** for less demanding systems are notable drawbacks. If your cylinder is not an exact match or if you re working with a non-SMC brand, this kit will not be suitable. Additionally, the reliance on SMC s supply chain and the risk of improper storage or installation could pose challenges in certain scenarios.

For **critical pneumatic applications** (e.g., manufacturing, automation, or heavy-duty machinery) where reliability is paramount, this kit is a **strong recommendation**. For **light-duty or non-SMC systems**, exploring generic alternatives or verifying exact compatibility first may be more cost-effective.

---

### **Final Recommendation**

- You are maintaining or repairing an **SMC PKH-PR402H series cylinder** (or a confirmed compatible model).

- Your application demands **high-performance sealing** to prevent leaks, contamination, or premature wear.

- You value **convenience and reduced downtime** from pre-assembled, brand-matched parts.

- Your system operates in **moderate to high-pressure environments** with potential exposure to oil or grease.

- Your cylinder is from a **different brand or series** (e.g., Festo, Bosch Rexroth).

- Your application is **low-pressure or non-abrasive**, where generic O-rings might suffice.

- You are on a **tight budget** and can verify that generic O-rings meet your performance needs.

- You lack **clear documentation** confirming the exact compatibility of the kit with your cylinder model.

- Always **consult the cylinder s manual or SMC s technical support** to confirm the correct O-ring size and type.

- Store the kit in a **sealed, cool environment** to preserve the O-rings elasticity.

- Follow **SMC s installation guidelines** (e.g., lubrication requirements) to ensure optimal performance.

- Consider **purchasing from an authorized SMC distributor** to guarantee authenticity and warranty coverage.

Details:

Unused item in the original packaging. All goods are so AS IS' and WITH ALL FAULTS meaning, without limitation, that. Model: PKH-PR402H0001. Weight lbs, oz: 0,5.

Will there be a dock or forklift. Country of Manufacture: N/A. We choose the carrier. Need it urgently.

Next Day Second Air Services are available. DOMESTIC SHIPPING: The shipping price is shown for US lower 48 states. Consignee: B. Items in Lot: 1.

LOCAL PICK-UP, Prefer to pick it up yourself. Your phone number and business name. Condition: New/Other.

After the return period has ended, you can no longer product.

part #: 434376 price

• $49.99

specifications sealantadhesivee:

• brand: Smc
• mpn: 434376
• model: Pkh-pr402h0001
• part type: Ring

seller sealantadhesivee:

• rating: 99.8%
• city: Middlebury, Indiana
• # reviews: 62827

offer sealantadhesivee:

• started: March 5, 2026
• sold: 0
• options: Ship-to-home
• availability: In Stock
• quantity: 2

general sealantadhesivee:

• Adhesives, Sealants Tapes > Caulks, Sealants Removers > Caulks Sealants
• condition: New Open box

returns sealantadhesivee:

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

payments sealantadhesivee:

• wallet: Apple-pay
• other
• credit card: Discover

shipping sealantadhesivee:

• class: Standard
• type: Fixed
• transit: 4-7 Days
• cost: $5.99
• carrier: USPS
• service: USPS Ground Advantage

Smc 434376 Is Similar To:

• Smc Kt-ncrb1bw10s Seal Kit With Shaft New Old Stock Free Shipping (23.7% similar) Smc KT-NCRB1BW10S seal kit with shaft, new old stock. Note that this price is for one unit even though multiple are pictured...(November 11th, 2024)
• Side Mount Custom Mb100ps Smc Tie-rod Cylinder Seal Kit (24.4% similar) Smc MB100-PS tie rod cylinder seal kit...(July 16th, 2025)
• Smc Cs92-160 New Cs92160 Seal Kit (29.7% similar) Shipped with ups ground. Condition is new. New Smc CS92-160 CS92160 seal kit...(March 24th, 2026)