RADCOLUBE RHP5606 is a premium, mineral-based petroleum hydraulic fluid manufactured in strict accordance with military specification MIL-PRF-5606H. Engineered for military, commercial, and general aviation aircraft hydraulic power systems, Radcolube RHP5606 provides exceptional low-temperature fluidity, excellent shear stability, and robust anti-wear protection. Designed specifically for operation across extreme environmental temperature drops down to -54°C (-65°F), this super-clean hydraulic fluid ensures instantaneous response in flight control actuators, landing gear shock struts, and hydraulic brake systems. Formulated with high-grade mineral base oils and advanced additive packages, RHP5606 shields vital metal components against corrosion, oxidation, and foaming across demanding flight-line and MRO servicing operations.

Technical Specifications & Chemical Properties

• Manufacturer / Brand: Radco Industries, Inc. / RADCOLUBE®
• Part Number / Series: RADCOLUBE® RHP5606
• Military Specification: MIL-PRF-5606H Qualified Product List (QPL) Listed
• Fluid Base Type: High-Refined Petroleum / Mineral Hydrocarbon Base
• NATO Code / Fluid Identifier: H-515
• Kinematic Viscosity:
  • At 40°C (104°F): ≥ 13.2 cSt
  • At -54°C (-65°F): ≤ 500 cSt (delivers immediate low-temperature hydraulic response)
• Flash Point (Cleveland Open Cup): ≥ 93°C (200°F)
• Pour Point: ≤ -60°C (-76°F)
• Operating Temperature Range: -65°F to 275°F (-54°C to 135°C) continuous service
• Color: Red (Dyed for instant fluid identification and leak detection)
• Fluid & Seal Compatibility: Fully compatible with conventional nitrile (Buna-N), fluorocarbon (Viton), and silicone seals used in MIL-PRF-5606 hydraulic glands, as well as synthetic PAO fluids (MIL-PRF-83282 and MIL-PRF-87257).

Approved Specifications & Military Conformance:

Radcolube RHP5606 holds official Quality Products List (QPL) status under defense and industrial standards:

• MIL-PRF-5606H QPL Certified: Qualified under military protocols for fixed-wing, rotary-wing, and naval support hydraulic applications.
• NATO H-515 Specification: Approved across NATO military forces as a standardized aircraft petroleum hydraulic fluid.
• Super-Clean Particulate Quality: Packaged under cleanroom conditions to meet rigid particulate cleanliness standards (NAS 1638 Class 5 / ISO 4406) for precision servovalve protection.

Key Features & Performance Benefits

• Sub-Zero Fluidity & Quick Response: Maintains low viscosity at sub-zero high-altitude temperatures (-54°C), eliminating actuator lag during cold-weather startups.
• High Viscosity Index (VI): Resists extreme thinning under elevated operational heat while retaining fluid motion in freezing conditions.
• Advanced Anti-Wear & Oxidation Inhibitors: Protects high-pressure hydraulic pumps, pistons, and valves against scoring, cavitation, and sludge formation.
• Red Dye Indicator: Bright red dye allows rapid visual identification during servicing and simplifies maintenance leak detection.

Typical Applications

• Aircraft Landing Gear & Braking Systems: Primary shock strut fluid (oleo struts) and hydraulic power fluid for aircraft wheel brakes and nose-wheel steering.
• Flight Control & Actuation Loops: Circulates in primary flight control actuators, flap systems, and hydraulic power units in GA, commercial, and defense airframes.
• Ground Support & Maintenance Servicing: Standard fluid used for flushing rigs, hydraulic servicing carts, and test stands in 145 MRO facilities.

• All in-stock orders are processed within 1–2 business days (excluding weekends and holidays) after receiving your order confirmation email.
• Orders with a lead time will ship according to the estimated shipping time shown on the product page.
• If we experience a high volume of orders or if an item is backordered, processing times may be slightly delayed. We will notify you promptly via email.

• Returns and damage claims must be made within a maximum of 3 business days after receiving the product, with prior authorization from Aircraft Shop Supply (Return Material Authorization - RMA). Returns without prior notice or written authorization will not be accepted. We strongly recommend inspecting the product upon delivery; many products require special storage conditions for which we are not responsible once they arrive to the client's facility. Please review the product's SDS for proper storage and handling.
• For products with 3 to 6 months of remaining shelf life, claims must be made within the next 2 business days after receipt.
• Returns are not accepted for products with less than 3 months of remaining shelf life.
• Returns are not accepted for products purchased during a low Shelf Life promotion, items sold with discounts, or special orders that must be placed directly with the factory.
• The customer is responsible for the return shipping cost, except in cases where the return is due to an error on the part of Aircraft Shop Supply.
• Refunds will only be issued after the product has been inspected and no damage is found.
• A 25% Restocking Fee will be charged for returns of products in good condition that are either no longer needed or were ordered incorrectly.
• A 35% Restocking Fee will be charged for returns of products with one year or less of remaining shelf life.
• No Restocking Fee will be charged if Aircraft Shop Supply is responsible for incorrectly shipping a product, or if the order is damaged upon leaving the warehouse.
• Hazardous Materials & Dangerous Goods: These items are sold as final and are not eligible for return approval.

At Aircraft Shop Supply, we are committed to shipping the highest quality and freshest product possible. To ensure efficient stock rotation and meet aviation industry standards, our inventory management is governed by the following policy:

1. Scope of Application
All Sales Channels: This policy applies to all orders processed by Aircraft Shop Supply, including but not limited to: website purchases, direct email orders, formal Purchase Orders (POs), phone orders, and contract agreements.

2. Inventory Management (FIFO)
All products with an expiration date are managed and shipped on a strict "First In – First Out" (FIFO) basis.

3. Minimum Shipping Margin
Standard Guarantee: We will not ship any products with fewer than 30 days of use remaining (days before expiration), unless previously coordinated and agreed upon with the customer.

No Automatic Guarantees: Outside of this 30-day minimum margin, Aircraft Shop Supply does not make any automatic guarantee as to the specific length of time remaining on any shelf-life item for standard orders.

4. Special Customer Requirements
We understand that certain projects, maintenance schedules, or regulatory standards require strict specifications. If your order has specific shelf-life requirements, please proceed as follows:

How to Request: If you require a specific Date of Manufacture (DOM), Date of Expiration (DOE), or a specific minimum shelf-life percentage (%), you must clearly state this requirement:

In the Comments/Notes section when placing an online order.

Explicitly written on your Purchase Order (PO) or quote request email for offline orders.

Validation Process: Once your requirement is received:

We will ship your order if the available stock matches your specifications.

If we do not have the exact batch, we will contact you prior to shipping with the shelf-life percentage (%) or dates we have available for your acceptance.

5. Limitation of Liability and Validity of Information
To ensure transparency and manage expectations, the following terms and conditions apply:

Time-Limited Validity: Any information provided by our team regarding the remaining shelf-life percentage (%) is valid only at the exact time the inquiry is made. Due to high inventory turnover, availability is subject to change without prior notice.

Informational Purposes Only: Shelf-life data provided by Aircraft Shop Supply is strictly for informational purposes and reflects the availability at the moment of inquiry. It does not constitute a batch reservation or a product warranty.

Supply Chain Liability Exclusion: Aircraft Shop Supply is not responsible for the time elapsed or any product expiration that occurs after the order has been prepared and packed. This includes, but is not limited to: the time between order placement, carrier transit times, intermediary storage, customs delays, and final delivery to the end user. It is the customer's responsibility to account for these logistical lead times within their planning.