Hydraulic pipe fittings are classified by thread type as: G threads and MT threads.

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Release Date:

2022-01-04

Hydraulic pipe fittings are classified by thread type as follows: G threads, ZG threads, NF threads, MT threads, and others. Sealing methods include hard sealing, O-ring sealing, and threaded sealing. Sealing configurations encompass internal conical 60° seals, 60° seals, UIC face‑to‑face 24° seals, and face‑to‑face ED seals. Z‑type threaded seals rely on tooth‑to‑tooth engagement for sealing, while the remaining types use parallel threads. Parallel threads do not provide sealing on their own; they primarily offer mechanical support, with sealing achieved via flat surfaces or end faces.

Hydraulic pipe fittings are classified by thread type as: G threads and MT threads.

　　Hydraulic pipe fittings are classified by thread type as follows: G threads, ZG threads, NF threads, MT threads, and then by sealing method: hard sealing, O‑ring sealing, and threaded sealing. Sealing configurations include internal conical 60° sealing, 60° sealing, UIC face‑to‑face 24° sealing, and end-face ED sealing. Z‑type thread sealing (a tooth‑to‑tooth interlocking seal) is used for certain applications, while the remaining types employ parallel threads. Parallel threads do not provide sealing on their own; they primarily offer mechanical support, with sealing achieved via flat surfaces or end faces.
　　
　　The standard thread forms for hydraulic fittings are as follows:
　　
　　Type A is a flat‑head H‑type, with an internal flare angle of 26 degrees.
　　
　　Type O has a flat head and can accommodate an O-ring.
　　
　　Type C features an internal cone with a 60° angle, commonly referred to as “internal concavity” or “internal flare.” Type D has an external spherical head, often called a “pointed tip.” Conventional designations, such as M18×1.5D, indicate an M18×1.5 thread and an external spherical head.

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