Hydraulic and pipe connection type identification
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.
Records21
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LicenceFactual 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.
The data
| Connection type | Governing standard | Region of origin | Thread type (tapered or parallel) | Seat or flare angle | Seal method | Interchangeability notes |
|---|---|---|---|---|---|---|
| BSPP | BSP | British Connections | parallel | cone seat | A captive seal is made using metal to metal angled surfaces or a combination of metal to metal and an O-ring. | very similar (but not interchangeable) with the American NPSM male |
| BSPT | BSP | British Connections | tapered | Sealing takes place by distortion of the threads. | comparable to NPT, except most sizes have a different thread pitch, plus the OD's and thread form are close, but not the same | |
| DIN 2353 / ISO 8434 | DIN 2353 / ISO 8434 | German Connections | straight metric thread | 24° | The straight metric thread male has a 24° angle. Its recessed counter-bore matches the tube O.D. it is connected to. | |
| DIN 3852 | DIN 3852 | German Connections | straight metric thread | 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. | |
| DIN 7631 | DIN 7631 | German Connections | straight metric thread | 60° | 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. | |
| Instrumentation Fittings (Double and Single Ferrule) | Instrumentation | Instrumentation Fittings | UNEF (extra fine) | 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. | |
| ISO 6149 | ISO 6149 | ISO Connections | straight threads | flat face | 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. | similar to the SAE J514 Straight Thread O-ring Boss (ORB), this type of connection incorporates metric threads |
| ISO/DIS 6162 4-Bolt Flange | ISO/DIS 6162 | ISO Connections | flange bolts | flat surface | 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. | Excluding bolt sizes, SAE J518, JIS B 8363, ISO/DIS 6162 and DIN 20066 are interchangeable. |
| JIS 210 Kgf/cm2 4-Bolt Square Flange | JIS | Japanese Connections | flange bolts | flat face | JIS 210 Kgf/cm2 4-Bolt Square Flange incorporates a JIS 4-bolt square flange connection | comparable to SAE 4-bolt flange connections with one difference – the flange itself is different and the JIS bolt pattern is square |
| JIS 30° Female (Cone) Seat | JIS B 0202 | Japanese Connections | parallel pipe threads | 30° | Japanese JIS 30° flare connections are comparable to American SAE 37° flare connections in application and sealing principals. | JIS 30° flare angle and dimensions are different with threads that are similar to BSPP |
| JIS 30° Male Inverted Seat | JIS B 0202 | Japanese Connections | parallel pipe threads | 30° | 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. |
| JIS B 8363 4-Bolt Flange | JIS B 8363 | Japanese Connections | flange bolts | flat surface | 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. | Excluding bolt sizes, SAE J518, JIS B 8363, ISO/DIS 6162 and DIN 20066 are interchangeable. |
| JIS Tapered Pipe (PT) | JIS B 0203 | Japanese Connections | tapered | 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. | |
| NPT | NPT | American Connections | tapered | 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. | ||
| NPTF | NPTF | American Connections | tapered thread | They have a tapered thread by which a seal is made by deformation of the threads. | ||
| SAE J1453 (ORFS) | SAE J1453 | American Connections | straight thread | flat face | 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 J1926 Straight Thread O-Ring Boss (ORB) | SAE J1926 | American Connections | straight thread | flat surface | 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 J512 45° | SAE J512 | American Connections | straight thread | 45° | The male and female connections have 45° seats, where the seal is make where the male flare and the female cone meet. | 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 Inverted | SAE J512 | American Connections | straight thread | 45° flare | 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 J514 JIC/37° | SAE J514 | American Connections | straight thread | 37° | Both male and female components have 37° seats. The seal is made by establishing contact between the male flared and female coned seat. | 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 J518 4-Bolt Flange | SAE J518 | American Connections | flange bolts | flat surface | 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. | Excluding bolt sizes, SAE J518, JIS B 8363, ISO/DIS 6162 and DIN 20066 are interchangeable. |
Where this came from
Every record above links the page it was taken from and quotes the sentence that states it. These are the 1 source this dataset was assembled from.
- brennaninc.comhttps://brennaninc.com/connection-types/
Machine-readable
- data.jsonThe whole dataset — every record with its source URL and source quote.
- Open Knowledge Format bundleOne JSON object per line — every record's frontmatter and quoted span exactly as it is held here, in one fetch.
- How this is made and checkedWhat "verified against source" does and does not mean.