Is the SAE 6000 Weld Flange Connection, Carbon Steel, Type D6 suitable for continuous operation at +100°C without additional cooling?

Yes. The SAE 6000 Weld Flange Connection, Carbon Steel, Type D6 is specified for an operating temperature range up to +100°C and is constructed from high‑quality carbon steel with a galvanized finish and an NBR O‑ring. Based on the provided description, it is suitable for continuous operation at +100°C without additional cooling, provided that: - system pressures and fluid temperatures do not cause local overheating above +100°C, - the NBR O‑ring’s temperature limits (NBR typically up to ~100°C continuous) are acceptable for your specific duty cycle and chemical exposure, and - installation and surrounding components do not introduce higher thermal loads. If your application operates persistently at the upper limit, or involves pressure spikes, aggressive fluids, or extended UV/ozone exposure, verify NBR compatibility and consider specifying a higher‑temperature seal or additional cooling to increase margin.

Can the SAE 6000 Weld Flange Connection, Carbon Steel, Type D6 be used with aggressive hydraulic fluids without affecting the NBR O-ring's sealing performance?

No. The SAE 6000 Weld Flange Connection, Carbon Steel, Type D6 Format is supplied with an NBR (nitrile) O‑ring and an operating temperature range of −20°C to +100°C. NBR offers good resistance to mineral oils and many standard hydraulic fluids, but it is not suitable for aggressive hydraulic fluids (e.g., phosphate esters, some synthetic fluids, aggressive glycol or ketone-based fluids, or fluids with strong solvents/additives) that can cause swelling, hardening or loss of elasticity. Use of such aggressive fluids risks degradation of the NBR O‑ring and loss of sealing performance. If your system uses aggressive or unknown fluids, choose a flange variant with a compatible seal material (e.g., FKM/Viton, HNBR, or other specialist elastomers) or confirm fluid compatibility with the seal manufacturer before installation.

SAE 6000 Weld Flange Connection, Carbon Steel, Type D6

All products, High-pressure adapters/

Additional information

Material	CS – steel (cast iron)

The SAE 6000 flange connection is designed for demanding hydraulic applications, combining a compact construction with a practical welding socket that ensures reliable and durable installation. Manufactured from high-quality carbon steel with a galvanized finish, it offers excellent resistance to wear and corrosion, extending service life even in intensive operating conditions. The flange is supplied complete with mounting screws and an NBR O-ring seal, providing a secure and leak-free connection that enhances system efficiency. With an operating temperature range from -20°C to +100°C, it guarantees consistent performance across a wide spectrum of environments, making it a versatile solution for modern hydraulic systems where safety, reliability, and ease of assembly are essential.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
HK-D6-SA-06-17	SAE 6000 3/8" flange fitting, for welding, 17.5 mm	-	420	In stock	Enquiry
HK-D6-SA-08-21	SAE 6000 1/2" collar fitting, for welding, 21.6 mm	-	420	In stock	Enquiry
HK-D6-SA-12-27	SAE 6000 collar fitting 3/4", for welding 27.2 mm	-	420	In stock	Enquiry
HK-D6-SA-16-34	SAE 6000 1" collar fitting, for welding 34.5 mm	-	420	In stock	Enquiry
HK-D6-SA-20-42	SAE 6000 collar fitting 1.1/4", for welding 42.8 mm	-	420	In stock	Enquiry
HK-D6-SA-24-48	SAE 6000 collar fitting 1.1/2", for welding 48.6 mm	-	420	In stock	Enquiry
HK-D6-SA-32-61	SAE 6000 2" collar fitting, for welding 61 mm	-	420	In stock	Enquiry
HK-D6-SA-40-76	SAE 6000 collar fitting 2.1/2", for welding 76.6 mm	-	420	In stock	Enquiry
HK-D6-SA-48-90	SAE 6000 3" collar fitting, for welding, 90.5 mm	-	420	In stock	Enquiry

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The SAE 6000 flange connection is designed for demanding hydraulic applications, combining a compact construction with a practical welding socket that ensures reliable and durable installation. Manufactured from high-quality carbon steel with a galvanized finish, it offers excellent resistance to wear and corrosion, extending service life even in intensive operating conditions. The flange is supplied complete with mounting screws and an NBR O-ring seal, providing a secure and leak-free connection that enhances system efficiency. With an operating temperature range from -20°C to +100°C, it guarantees consistent performance across a wide spectrum of environments, making it a versatile solution for modern hydraulic systems where safety, reliability, and ease of assembly are essential.