asset: hydraulic-pipe-connection-types

asset_type: lookup

body: Identifying characteristics of each hydraulic, pipe, and instrumentation connection standard used in fluid power and plumbing systems. For each connection type, gives the governing standard, seat or flare angle, whether the thread is tapered or parallel, how the seal is made, and interchangeability notes with other standards. Answers the recurring field question 'what kind of fitting is this?' — the identification step that must happen before any cross-reference or adapter lookup.

licence: Factual compilation of connection type characteristics from a manufacturer's published identification guide. Individual facts (standard number, seat angle, thread type) are not copyrightable; short attributed quotes link back to the source page.

title: Hydraulic and pipe connection type identification

type: dataset


body:
**Connection type:** BSPP

**Governing standard:** BSP

**Region of origin:** British Connections

**Thread type (tapered or parallel):** parallel

**Seat or flare angle:** cone seat

**Seal method:** A captive seal is made using metal to metal angled surfaces or a combination of metal to metal and an O-ring.

**Interchangeability notes:** very similar (but not interchangeable) with the American NPSM male

> The British Standard Pipe Parallel (BSPP) male connection is comparable to NPSM male except most sizes have a different thread pitch. A captive seal is made using metal to metal angled surfaces or a combination of metal to metal and an O-ring. This type of connection is very similar (but not interchangeable) with the American NPSM male. The female swivel BSPP has a tapered nose flareless swivel where the seal occurs on the cone seat of the male connector.

Source: <https://brennaninc.com/connection-types/>

connection_type: BSPP

governing_standard: BSP

region: British Connections

seat_angle: cone seat

thread_type: parallel

title: BSPP — Hydraulic and pipe connection type identification

type: lookup


body:
**Connection type:** BSPT

**Governing standard:** BSP

**Region of origin:** British Connections

**Thread type (tapered or parallel):** tapered

**Seal method:** Sealing takes place by distortion of the threads.

**Interchangeability notes:** comparable to NPT, except most sizes have a different thread pitch, plus the OD's and thread form are close, but not the same

> British Connections British Standard Pipe (BSP) and British Standard Pipe Tapered (BSPT) connections are comparable to NPT, except most sizes have a different thread pitch, plus the OD’s and thread form are close, but not the same. Sealing takes place by distortion of the threads. Because of this, thread sealants are recommended when securing these connections.

Source: <https://brennaninc.com/connection-types/>

connection_type: BSPT

thread_type: tapered

title: BSPT — Hydraulic and pipe connection type identification


body:
**Connection type:** DIN 2353 / ISO 8434

**Governing standard:** DIN 2353 / ISO 8434

**Region of origin:** German Connections

**Thread type (tapered or parallel):** straight metric thread

**Seat or flare angle:** 24°

**Seal method:** The straight metric thread male has a 24° angle. Its recessed counter-bore matches the tube O.D. it is connected to.

> DIN 2353 / ISO 8434 series is a common male with three different possible female halves. The straight metric thread male has a 24° angle. Its recessed counter-bore matches the tube O.D. it is connected to.

Source: <https://brennaninc.com/connection-types/>

region: German Connections

thread_type: straight metric thread

title: DIN 2353 / ISO 8434 — Hydraulic and pipe connection type identification


body:
**Connection type:** DIN 3852

**Governing standard:** DIN 3852

**Region of origin:** German Connections

**Thread type (tapered or parallel):** straight metric thread

**Seal method:** DIN 3852 is a male connector and female port. It is a style controlled by German specifications.

**Interchangeability notes:** Other countries sometimes use it as a reference for connector and port designs.

> DIN 3852 is a male connector and female port. It is a style controlled by German specifications. Other countries sometimes use it as a reference for connector and port designs.

Source: <https://brennaninc.com/connection-types/>

title: DIN 3852 — Hydraulic and pipe connection type identification


body:
**Connection type:** DIN 7631

**Governing standard:** DIN 7631

**Region of origin:** German Connections

**Thread type (tapered or parallel):** straight metric thread

**Seat or flare angle:** 60°

**Seal method:** The male connector has a straight metric thread with a 60° angle on the recessed cone. The female has a straight thread with a seat that is a tapered nose. The contact of the cone of the male and the tapered nose of the female flareless swivel is where the seal takes place.

> DIN 7631 series is a common metric-style connection in hydraulic systems. The male connector has a straight metric thread with a 60° angle on the recessed cone. The female has a straight thread with a seat that is a tapered nose. The contact of the cone of the male and the tapered nose of the female flareless swivel is where the seal takes place.

Source: <https://brennaninc.com/connection-types/>

title: DIN 7631 — Hydraulic and pipe connection type identification


body:
**Connection type:** Instrumentation Fittings (Double and Single Ferrule)

**Governing standard:** Instrumentation

**Region of origin:** Instrumentation Fittings

**Thread type (tapered or parallel):** UNEF (extra fine)

**Seat or flare angle:** inner cone

**Seal method:** The seal is made between the front ferrule and the cone. The tubing is held in place by the swaging action caused by the tightening of the nut, which forces the front and back ferrules to bite into the tubing, firmly holding it in place.

> Double and Single Ferrule Instrumentation Fittings are widely used in fluid or gas transfer applications such as refineries, chemical plants and food processing plants. The male end of a double-ferrule instrumentation fitting has a recessed counter-bore which matches the tube OD being used, plus an inner cone. The seal is made between the front ferrule and the cone. The tubing is held in place by the swaging action caused by the tightening of the nut, which forces the front and back ferrules to bite into the tubing, firmly holding it in place.

Source: <https://brennaninc.com/connection-types/>

governing_standard: Instrumentation

region: Instrumentation Fittings

seat_angle: inner cone

thread_type: UNEF (extra fine)

title: Instrumentation Fittings (Double and Single Ferrule) — Hydraulic and pipe connection type identification

unverified_fields: connection_type, thread_type


body:
**Connection type:** ISO 6149

**Governing standard:** ISO 6149

**Region of origin:** ISO Connections

**Thread type (tapered or parallel):** straight threads

**Seat or flare angle:** flat face

**Seal method:** The male connector has straight threads with an O-ring. The female port is also straight threads machined surface to provide a smooth, flat, accurately located surface (minimum spotface), along with a chamfer where the O-ring seats. It seals when the O-ring is compressed into the chamfer when mating the male connection.

**Interchangeability notes:** similar to the SAE J514 Straight Thread O-ring Boss (ORB), this type of connection incorporates metric threads

> ISO 6149 Port and Stud Ends with ISO 261 Threads and O-ring Seal though it is similar to the SAE J514 Straight Thread O-ring Boss (ORB), this type of connection incorporates metric threads. The male connector has straight threads with an O-ring. The female port is also straight threads machined surface to provide a smooth, flat, accurately located surface (minimum spotface), along with a chamfer where the O-ring seats. It seals when the O-ring is compressed into the chamfer when mating the male connection. This is also considered a mechanical connection.

Source: <https://brennaninc.com/connection-types/>

region: ISO Connections

seat_angle: flat face

thread_type: straight threads

title: ISO 6149 — Hydraulic and pipe connection type identification


body:
**Connection type:** ISO/DIS 6162 4-Bolt Flange

**Governing standard:** ISO/DIS 6162

**Region of origin:** ISO Connections

**Thread type (tapered or parallel):** flange bolts

**Seat or flare angle:** flat surface

**Seal method:** The male is a flanged head with a groove for an O-ring to seat and either split or captive flange halves and bolt holes which match the port. The seal is made where the O-ring is compressed between the flanged head and the flat surface of the port. The connection is held by threaded bolts.

**Interchangeability notes:** Excluding bolt sizes, SAE J518, JIS B 8363, ISO/DIS 6162 and DIN 20066 are interchangeable.

> The seal is made where the O-ring is compressed between the flanged head and the flat surface of the port. The connection is held by threaded bolts. <https://brennaninc.com/fittings-101-flange> JIS 210 Kgf/cm2 4-Bolt Square Flange incorporates a JIS 4-bolt square flange connection which is comparable to SAE 4-bolt flange connections with one difference – the flange itself is different and the JIS bolt pattern is square. ISO Connections <https://brennaninc.com/fittings-101-flange> ISO/DIS 6162 4-Bolt Flange is another common connection found in fluid power systems. There are two pressure ratings for this connection- Code 61: PN 35/350 bar which is considered the standard series and Code 62: PN 415 bar which is the high pressure series. They maintain the same design, yet with the bold hole spacings and flanged head diameters being larger on the PN 415 bar high pressure connection. Inch or metric bolts are found in these connections, however there is an “M” stamped on the port if metric bolts are to be used. The female port of the fitting is a smooth, un-threaded port with four bolt holes set in a rectangular pattern in around the port. The male is a flanged head with a groove for an O-ring to seat and either split or captive flange halves and bolt holes which match the port. The seal is made where the O-ring is compressed between the flanged head and the flat surface of the port. The connection is held by threaded bolts.

Source: <https://brennaninc.com/connection-types/>

connection_type: ISO/DIS 6162 4-Bolt Flange

governing_standard: ISO/DIS 6162

seat_angle: flat surface

thread_type: flange bolts

title: ISO/DIS 6162 4-Bolt Flange — Hydraulic and pipe connection type identification

unverified_fields: interchangeability_notes, thread_type


body:
**Connection type:** JIS 210 Kgf/cm2 4-Bolt Square Flange

**Governing standard:** JIS

**Region of origin:** Japanese Connections

**Thread type (tapered or parallel):** flange bolts

**Seat or flare angle:** flat face

**Seal method:** JIS 210 Kgf/cm2 4-Bolt Square Flange incorporates a JIS 4-bolt square flange connection

**Interchangeability notes:** comparable to SAE 4-bolt flange connections with one difference – the flange itself is different and the JIS bolt pattern is square

> JIS 210 Kgf/cm2 4-Bolt Square Flange incorporates a JIS 4-bolt square flange connection which is comparable to SAE 4-bolt flange connections with one difference – the flange itself is different and the JIS bolt pattern is square.

Source: <https://brennaninc.com/connection-types/>

connection_type: JIS 210 Kgf/cm2 4-Bolt Square Flange

governing_standard: JIS

region: Japanese Connections

title: JIS 210 Kgf/cm2 4-Bolt Square Flange — Hydraulic and pipe connection type identification

unverified_fields: seat_angle, thread_type


body:
**Connection type:** JIS 30° Female (Cone) Seat

**Governing standard:** JIS B 0202

**Region of origin:** Japanese Connections

**Thread type (tapered or parallel):** parallel pipe threads

**Seat or flare angle:** 30°

**Seal method:** Japanese JIS 30° flare connections are comparable to American SAE 37° flare connections in application and sealing principals.

**Interchangeability notes:** JIS 30° flare angle and dimensions are different with threads that are similar to BSPP

> JIS 30° Female (Cone) Seat connections are are parallel pipe threads per JIS B 0202. Japanese JIS 30° flare connections are comparable to American SAE 37° flare connections in application and sealing principals. Yet, JIS 30° flare angle and dimensions are different with threads that are similar to BSPP.

Source: <https://brennaninc.com/connection-types/>

connection_type: JIS 30° Female (Cone) Seat

governing_standard: JIS B 0202

thread_type: parallel pipe threads

title: JIS 30° Female (Cone) Seat — Hydraulic and pipe connection type identification


body:
**Connection type:** JIS 30° Male Inverted Seat

**Governing standard:** JIS B 0202

**Region of origin:** Japanese Connections

**Thread type (tapered or parallel):** parallel pipe threads

**Seat or flare angle:** 30°

**Seal method:** JIS 30° Male Inverted Seat connections are parallel pipe threads per JIS B 0202.

**Interchangeability notes:** JIS parallel connections are comparable to BSPP connections. JIS parallel thread connections are interchangeable with BSPP connections.

> JIS 30° Male Inverted Seat connections are parallel pipe threads per JIS B 0202. JIS parallel connections are comparable to BSPP connections. JIS parallel thread connections are interchangeable with BSPP connections.

Source: <https://brennaninc.com/connection-types/>

connection_type: JIS 30° Male Inverted Seat

title: JIS 30° Male Inverted Seat — Hydraulic and pipe connection type identification


body:
**Connection type:** JIS B 8363 4-Bolt Flange

**Governing standard:** JIS B 8363

**Region of origin:** Japanese Connections

**Thread type (tapered or parallel):** flange bolts

**Seat or flare angle:** flat surface

**Seal method:** The male connector has a flanged head with a groove for seating an O-ring and either a captive flange or split flange with bolt holes to correspond to the port. The seal is made where the O-ring is compressed between the flanged head and the flat surface of the port. The connection is held by threaded bolts.

**Interchangeability notes:** Excluding bolt sizes, SAE J518, JIS B 8363, ISO/DIS 6162 and DIN 20066 are interchangeable.

> JIS B 8363 4-Bolt Flange connections are frequently used in fluid power systems. There are two pressure ratings for JIS B 8363 4-Bolt Flange fittings: Type I Code 61 is the standard series 4-Bolt Flange Type II Code 62 is the 6000 PSI series Each design concept is the same, yet the flanged head diameters and bolt hole spacing are larger for the Type II 6000 PSI connection. Metric and inch bolts are each used with these connectors. The male connector has a flanged head with a groove for seating an O-ring and either a captive flange or split flange with bolt holes to correspond to the port. The female port of the fitting is a smooth, un-threaded port with four bolt holes set in a rectangular pattern in around the port. The seal is made where the O-ring is compressed between the flanged head and the flat surface of the port. The connection is held by threaded bolts.

Source: <https://brennaninc.com/connection-types/>

connection_type: JIS B 8363 4-Bolt Flange

governing_standard: JIS B 8363

title: JIS B 8363 4-Bolt Flange — Hydraulic and pipe connection type identification


body:
**Connection type:** JIS Tapered Pipe (PT)

**Governing standard:** JIS B 0203

**Region of origin:** Japanese Connections

**Thread type (tapered or parallel):** tapered

**Seal method:** JIS Tapered Pipe (PT) has metric threads per JIS B 0203. These are JIS tapered threads and are comparable to the design of BSPT connections in their dimensions and appearance.

**Interchangeability notes:** JIS tapered thread connections are interchangeable with BSPT connections.

> JIS Tapered Pipe (PT) has metric threads per JIS B 0203. These are JIS tapered threads and are comparable to the design of BSPT connections in their dimensions and appearance. JIS tapered thread connections are interchangeable with BSPT connections.

Source: <https://brennaninc.com/connection-types/>

connection_type: JIS Tapered Pipe (PT)

governing_standard: JIS B 0203

title: JIS Tapered Pipe (PT) — Hydraulic and pipe connection type identification


body:
**Connection type:** NPT

**Governing standard:** NPT

**Region of origin:** American Connections

**Thread type (tapered or parallel):** tapered

**Seal method:** NPT is a U.S. standard for tapered threads used on pipes and fittings. They are used to effectively seal pipes for fluid and gas transfer.

> NPT (National Pipe Tapered) -style pipe threads have been widely used for over 100 years. NPT is a U.S. standard for tapered threads used on pipes and fittings. They are used to effectively seal pipes for fluid and gas transfer. The nominal pipe size can be identified by physically measuring the thread diameter, then subtracting 1/4".

Source: <https://brennaninc.com/connection-types/>

connection_type: NPT

governing_standard: NPT

region: American Connections

title: NPT — Hydraulic and pipe connection type identification


body:
**Connection type:** NPTF

**Governing standard:** NPTF

**Region of origin:** American Connections

**Thread type (tapered or parallel):** tapered thread

**Seal method:** They have a tapered thread by which a seal is made by deformation of the threads.

> NPTF (National Pipe Tapered Fuel) -style connections are widely used in fluid power systems. They have a tapered thread by which a seal is made by deformation of the threads. NPTF Threads are measured at the thread diameter and subtracting 1/4-inch to establish the nominal pipe size.

Source: <https://brennaninc.com/connection-types/>

connection_type: NPTF

governing_standard: NPTF

thread_type: tapered thread

title: NPTF — Hydraulic and pipe connection type identification


body:
**Connection type:** SAE J1453 (ORFS)

**Governing standard:** SAE J1453

**Region of origin:** American Connections

**Thread type (tapered or parallel):** straight thread

**Seat or flare angle:** flat face

**Seal method:** The male connector has a straight thread and an O-ring in the face. The female has a straight thread and a machined flat face. The seal takes place by compressing the O-ring onto the flat face of the female, similar to the split flange type fitting.

> SAE J1453 (ORFS) O-ring Face Seal connections are considered the best for leak control. The male connector has a straight thread and an O-ring in the face. The female has a straight thread and a machined flat face. The seal takes place by compressing the O-ring onto the flat face of the female, similar to the split flange type fitting. The threads maintain the connection mechanically.

Source: <https://brennaninc.com/connection-types/>

connection_type: SAE J1453 (ORFS)

governing_standard: SAE J1453

thread_type: straight thread

title: SAE J1453 (ORFS) — Hydraulic and pipe connection type identification


body:
**Connection type:** SAE J1926 Straight Thread O-Ring Boss (ORB)

**Governing standard:** SAE J1926

**Region of origin:** American Connections

**Thread type (tapered or parallel):** straight thread

**Seat or flare angle:** flat surface

**Seal method:** The male connection is a straight thread with an O-ring. The female port has a straight thread and a machined surface to provide a smooth, flat surface (minimum spotface), along with a chamfer where the O-ring seats. It seals when the O-ring is compressed into the chamfer when mating the male connection.

> SAE J1926 Straight Thread O-Ring Boss (ORB) is recommended by the National Fire Protection Association (N.F.P.A.) for leak prevention in medium and high pressure hydraulic systems. The male connection is a straight thread with an O-ring. The female port has a straight thread and a machined surface to provide a smooth, flat surface (minimum spotface), along with a chamfer where the O-ring seats. It seals when the O-ring is compressed into the chamfer when mating the male connection. This is also considered a mechanical connection.

Source: <https://brennaninc.com/connection-types/>

governing_standard: SAE J1926

title: SAE J1926 Straight Thread O-Ring Boss (ORB) — Hydraulic and pipe connection type identification


body:
**Connection type:** SAE J512 45°

**Governing standard:** SAE J512

**Region of origin:** American Connections

**Thread type (tapered or parallel):** straight thread

**Seat or flare angle:** 45°

**Seal method:** The male and female connections have 45° seats, where the seal is make where the male flare and the female cone meet.

**Interchangeability notes:** dash sizes: -02, -03, -04, -05, -08, and -10 of SAE 37° and SAE 45° have the same threads, but NOT the same seat angles. Intermixing the two different types of fittings will result in leakage

> SAE J512 45° connections are used in automotive, refrigeration and truck pipe systems. These connectors are typically brass material. The male and female connections have 45° seats, where the seal is make where the male flare and the female cone meet. This is a mechanical connection also.

Source: <https://brennaninc.com/connection-types/>

connection_type: SAE J512 45°

governing_standard: SAE J512

title: SAE J512 45° — Hydraulic and pipe connection type identification


body:
**Connection type:** SAE J512 Inverted

**Governing standard:** SAE J512

**Region of origin:** American Connections

**Thread type (tapered or parallel):** straight thread

**Seat or flare angle:** 45° flare

**Seal method:** The male connector is either a 45° flare within the tube fitting or a 42° seat in the machined adapter. The female incorporates a straight thread with a 42° inverted flare. The fittings are sealed at the flared surfaces.

> SAE J512 inverted connections are typically used in automotive systems. The male connector is either a 45° flare within the tube fitting or a 42° seat in the machined adapter. The female incorporates a straight thread with a 42° inverted flare. The fittings are sealed at the flared surfaces. These threads also maintain a mechanical connection.

Source: <https://brennaninc.com/connection-types/>

connection_type: SAE J512 Inverted

seat_angle: 45° flare

title: SAE J512 Inverted — Hydraulic and pipe connection type identification


body:
**Connection type:** SAE J514 JIC/37°

**Governing standard:** SAE J514

**Region of origin:** American Connections

**Thread type (tapered or parallel):** straight thread

**Seat or flare angle:** 37°

**Seal method:** Both male and female components have 37° seats. The seal is made by establishing contact between the male flared and female coned seat.

**Interchangeability notes:** dash sizes: -02, -03, -04, -05, -08, and -10 of SAE 37° and SAE 45° have the same threads, but NOT the same seat angles. Intermixing the two different types of fittings will result in leakage

> SAE J514 JIC/37° hydraulic connections are common in most fluid power systems. Both male and female components have 37° seats. The seal is made by establishing contact between the male flared and female coned seat. This is also considered a mechanical connection.

Source: <https://brennaninc.com/connection-types/>

connection_type: SAE J514 JIC/37°

governing_standard: SAE J514

title: SAE J514 JIC/37° — Hydraulic and pipe connection type identification


body:
**Connection type:** SAE J518 4-Bolt Flange

**Governing standard:** SAE J518

**Region of origin:** American Connections

**Thread type (tapered or parallel):** flange bolts

**Seat or flare angle:** flat surface

**Seal method:** The male is a flanged head with a groove for an O-ring and either split or captive flange halves and bolt holes which match the port. The seal is made where the O-ring is compressed between the flanged head and the flat surface of the port. The connection is held by threaded bolts.

**Interchangeability notes:** Excluding bolt sizes, SAE J518, JIS B 8363, ISO/DIS 6162 and DIN 20066 are interchangeable.

> SAE J518 4-Bolt Flange* There are two pressure ratings for these connections: Code 61 which is considered the standard series and Code 62 which is the 6000 PSI series. The design is the same for each series, yet the flange head diameters and bolt hole spacing are larger for the 6000 PSI high pressure Code 62 connection. The female port of the fitting is a smooth, un-threaded port with four bolt holes set in a rectangular pattern around the port. The male is a flanged head with a groove for an O-ring and either split or captive flange halves and bolt holes which match the port. The seal is made where the O-ring is compressed between the flanged head and the flat surface of the port. The connection is held by threaded bolts.

Source: <https://brennaninc.com/connection-types/>

connection_type: SAE J518 4-Bolt Flange

governing_standard: SAE J518

title: SAE J518 4-Bolt Flange — Hydraulic and pipe connection type identification