Thaimart SEALTHAI
Direct Engineering Summary:
The Hydraulic Piston & Rod Seal (Profile K21) (Profile K21 / Material NBR) is an industrial-grade sealing solution manufactured from Industrial Nitrile Elastomer NBR (70–75 Shore A). Engineered to eliminate Lubricant leakage around rotating shafts and dust ingress causing premature bearing failure, it supports operating temperatures of -30°C to +100°C (Peak +120°C), pressures of 0.3 – 0.5 Bar (Standard Oil Seal), and surface speeds of Up to 12 – 15 m/s. Available in stock at SEALTHAI starting from ฿311 THB.
1. Field Problem Analysis & Engineering Solution
In industrial machinery, power transmission gearboxes, and hydraulic cylinders, a leading cause of unplanned downtime is Lubricant leakage around rotating shafts and dust ingress causing premature bearing failure. Selecting an inferior elastomer or mismatched profile accelerates lip wear and lubricant leakage.
SEALTHAI Engineering Solution: Precision molded to DIN 3760 / ISO 6194 with carbon steel casing and garter spring for reliable oil retention and dust exclusion.
2. Engineering Specification Grid
| Technical Parameter | Engineering Specification |
|---|---|
| Seal Type & Profile | Hydraulic Piston & Rod Seal (Profile K21) (Profile: K21) |
| Material Compound | Industrial Nitrile Elastomer NBR (70–75 Shore A) |
| Operating Temperature | -30°C to +100°C (Peak +120°C) |
| Max Operating Pressure | 0.3 – 0.5 Bar (Standard Oil Seal) |
| Surface Speed Rating | Up to 12 – 15 m/s |
| Compatible Media | Mineral oils, engine oils, gear lubricants, standard hydraulic fluids, greases, and water |
3. Available Sizes (ID × OD × THK) & Online Pricing
| (ID × OD × THK) Inner Diameter x Outer Diameter x Thickness (mm) | SKU | Material / Profile | Online Price | Availability | Order |
|---|---|---|---|---|---|
| ขนาดมาตรฐาน | HS-RP-1325 | NBR (K21) | ฿311 THB | ✓ In Stock (146 pcs) | Buy on Shopee |
4. Comparison: SEALTHAI Industrial Grade vs. Generic Seals vs. OEM Lead Time
| Comparison Metric | SEALTHAI (K21 - NBR) | Low-Grade Generic Seal | Imported OEM Backorder |
|---|---|---|---|
| Thermal & Pressure Endurance | Verified (-30°C to +100°C (Peak +120°C) / 0.3 – 0.5 Bar (Standard Oil Seal)) | Rapid hardening, cracking, or lip extrusion | Verified OEM Spec |
| Machine Downtime | In Stock in Thailand (1–2 Days Express) | Frequent repeat teardown & fluid loss | 2–6 Weeks Import Lead Time |
| Total Cost Efficiency | Optimal Value (From ฿311 THB) | High hidden labor & downtime cost | 3–5x Higher Price |
5. Engineering Installation Checklist & Limitations
- Dimension Verification: Measure the actual shaft diameter (ID), housing bore diameter (OD), and groove width (THK) in millimeters using a calibrated digital vernier caliper.
- Counterface Surface Finish: Ensure the shaft surface roughness is within Ra 0.2 – 0.8 µm with hardness HRC ≥ 45. If the shaft has a wear groove, install a Shaft Repair Sleeve prior to mounting the new seal.
- Lead-In Chamfer & Pre-Lubrication: Verify a 15° – 30° lead-in chamfer on the shaft edge and lightly lubricate the sealing lip before installation to prevent dry-start scoring or garter spring dislodgement.
🛒 Order Online or Consult SEALTHAI Engineers
Ready to ship across Thailand within 1–2 business days. Full corporate tax invoices available.