Is the ORFS Straight Reduction Fitting with UNF Male Thread, Carbon Steel, Type GR compatible with standard UNF ports and do I need thread sealant?

Yes. The ORFS Straight Reduction Fitting with UNF Male Thread, Carbon Steel, Type GR is compatible with standard UNF ports that accept ORFS (O-Ring Face Seal) external UNF male threads. The integrated O‑ring in the flat face groove provides the sealing interface, so when mated to a proper ORFS female port it achieves a secure, leak-free connection without additional thread sealant. Do ensure the mating port is the correct ORFS type and in good condition, and that the O‑ring is compatible and undamaged; use thread sealant only if the mating component is not a true ORFS face-seal port or if manufacturer instructions require additional measures.

Can the ORFS Straight Reduction Fitting with UNF Male Thread, Carbon Steel, Type GR be used with metric-threaded ports or adapters without compromising the seal?

No. The ORFS Straight Reduction Fitting with UNF Male Thread, Carbon Steel, Type GR is designed to seal via its external UNF thread and integrated O‑ring in the flat face groove. Metric-threaded ports or adapters have different thread forms, pitch and major/minor diameters, so mating a UNF male thread to a metric female thread will prevent proper engagement and correct face-to-face seating of the O‑ring. This mismatch risks poor alignment, loss of compression on the O‑ring and leakage (especially under pressure), and may damage threads or the sealing face. To maintain the intended leak‑free performance, use the fitting only with compatible UNF ports/adapters or employ a proper adapter specifically specified to convert UNF to the correct metric thread while preserving the ORFS flat face/O‑ring sealing geometry.

ORFS Straight Reduction Fitting with UNF Male Thread, Carbon Steel, Type GR

Additional information

Material	CS – steel (cast iron)

The straight reducing ORFS fitting type GR is a robust and reliable connector designed for demanding hydraulic applications, ensuring secure and leak-free performance even under high pressure. Manufactured from high-quality carbon steel and finished with a durable galvanization layer, it offers excellent resistance to corrosion and mechanical wear, extending the service life of hydraulic systems. The external UNF thread with an integrated O-ring seal in the flat face groove guarantees precise alignment, optimal sealing, and easy installation without the need for additional sealing materials. Its reducing function allows seamless connection of components with different diameters, making it a versatile solution for system optimization and space-saving assembly. Engineered for efficiency, durability, and safety, this fitting is an ideal choice for industries that require reliable hydraulic connections, such as construction, agriculture, and heavy machinery.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
HO-GR-11-09	GZ ORFS fitting 11/16"-16 / 9/16"-18	-	630	In stock	Enquiry
HO-GR-13-11	GZ ORFS fitting 13/16"-16 / 11/16"-16	-	630	In stock	Enquiry
HO-GR-16-13	GZ ORFS fitting 1"-14 / 13/16"-16	-	420	In stock	Enquiry
HO-GR-19-11	GZ ORFS fitting 1.3/16"-12 / 11/16"-16	-	420	In stock	Enquiry
HO-GR-19-13	GZ ORFS fitting 1.3/16"-12 / 13/16"-16	-	420	In stock	Enquiry
HO-GR-19-16	GZ ORFS fitting 1.3/16"-12 / 1"-14	-	420	In stock	Enquiry
HO-GR-23-19	GZ ORFS fitting 1.7/16"-12 / 1.3/16"-12	-	420	In stock	Enquiry
HO-GR-27-23	GZ ORFS fitting 1.11/16"-12 / 1.7/16"-12	-	280	In stock	Enquiry

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The straight reducing ORFS fitting type GR is a robust and reliable connector designed for demanding hydraulic applications, ensuring secure and leak-free performance even under high pressure. Manufactured from high-quality carbon steel and finished with a durable galvanization layer, it offers excellent resistance to corrosion and mechanical wear, extending the service life of hydraulic systems. The external UNF thread with an integrated O-ring seal in the flat face groove guarantees precise alignment, optimal sealing, and easy installation without the need for additional sealing materials. Its reducing function allows seamless connection of components with different diameters, making it a versatile solution for system optimization and space-saving assembly. Engineered for efficiency, durability, and safety, this fitting is an ideal choice for industries that require reliable hydraulic connections, such as construction, agriculture, and heavy machinery.