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

For ISO/DIS 6162 4-Bolt Flange, governing standard is ISO/DIS 6162; region of origin is ISO Connections; thread type (tapered or parallel) is flange bolts; seat or flare angle is flat surface; seal method is 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, recorded from its source on 2026-08-13.

- **Connection type:** ISO/DIS 6162 4-Bolt Flange _(verified: appears in the quote below)_
- **Governing standard:** ISO/DIS 6162 _(verified: appears in the quote below)_
- **Region of origin:** ISO Connections _(our reading, not quoted from the source)_
- **Thread type (tapered or parallel):** flange bolts
- **Seat or flare angle:** flat surface _(verified: appears in the quote below)_
- **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. _(verified: appears in the quote below)_
- **Interchangeability notes:** Excluding bolt sizes, SAE J518, JIS B 8363, ISO/DIS 6162 and DIN 20066 are interchangeable.

## What the source says

> 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/

Last verified: 2026-08-13. Review by: 2028-08-12.
Part of [Hydraulic and pipe connection type identification](https://referencesource.org/industrial-cross-reference-bearings-seals-fittings/).