Butt Weld SAE Flange

Butt weld SAE flange is a SAE flange that is made in accordance with SAE J518 / ISO 6162 standards. SAE flanges are supplied for oil hydraulic systems in sectors such as industrial hydraulics, mobile hydraulics and oil and gas. The acronym ‘SAE' stands for the Society of Automotive Engineers, a group founded in 1905 to set standards for numerous sectors in the engineering area. The flange includes 4 bolt connection holes and is widely used around the world. There are several bolt grades that are matched to install in equipment:

• Bolt grade 8.8: Yellow zinc as standard material with carbon steel flange.
• Bolt grade 10.9: FIZn 240h L is effective for high temperature applications and it is available on request.
• Bolt grade SS304: Standard material with a stainless steel flange.
• Bolt grade SS316: Provides greater corrosion resistance,  available upon request

Butt Weld SS316 SAE Flanges

SAE Flanges are manufactured from two kinds of material, respectively steel ST52.3 or stainless steel AISI SS316L. The SAE flange body is made from normalized forgings so that it can be used for high pressure applications. There are two kinds of surface for SAE flange which is rough surface and smooth surface. The rough surface is on the pipe end connection side, while the smooth surface is at flange to flange side.

For Code 61 series, SAE flanges are available in nominal size ranging from 3/8"NB (DN10) to 5"NB (DN125). While for Code 62 series, SAE flanges size are available from 3/8"NB (DN10) to 3"NB (DN80).

Code 61 series and code 62 series represent different working pressure that each series can withstand. The maximum working pressure that Code 61 series can withstand range from 34 Bar to 345 Bar, depending on the sizes. The bigger size of code 61 SAE flange, the lower working pressure that it can withstand. For Code 62 series, it can withstand up to 414 Bar working pressure.

However, the pressure rating of SAE flanges and connected equipment combination might vary from each other. For example: if a pipe connected to the flange has a lower maximum working pressure, it will result in an overall lower working pressure of the system. Therefore in a system, the item with the lowest pressure will be the maximum working pressure of the system.

For the connections of SAE flanges, it is usually available in butt weld connection with various thickness such as SCH40, SCH80, SCH160 or SCHXXS. It is advised that SAE flange to assembly with the same pipe size and  thickness to ensure smooth passage of fluids. The connection end thickness becomes thicker when the schedule thickness moves from SCH40 to SCH80, applied to other thickness as well. For example, connection end thickness of SAE flange size 1/2" with SCHXXS is thicker than connection end thickness of SAE flange 1/2" with SCH160. The thickness of the connection end also depends on the SAE flange size. The bigger the size, the thicker the thickness. For example, connection end thickness of SAE flange size 1" with SCH80 is thicker than connection end thickness of SAE flange size 3/4" with SCH80.

SAE flanges are available in two types: Flat Side and O-ring Side. Flat side of the SAE flange is a SAE flange that comes with bolt thread (UNC / Metric) and the O-ring side of the SAE flange is a SAE flange that contains a groove seat to place a rubber o-ring. Flanges with o-ring have an advantage of preventing leakage as all metal-to-metal flanges are more prone to leakage.

There are 3 configurations of SAE flanges which are flat side, O-ring side or complete set. A complete set of SAE flanges are a combination of flat side and O-ring side where it forms a seal between the flat surface and O-ring held in a recessed circular groove in the other half. By tightening the allan cap screws in diagonal sequence, it draws flat side and O-ring side together and compresses the O-ring.

SAE flange complete set is tightened by using socket head cap screws and spring washers according to the recommended torque value. According to SAE J518 standard, the lengths of cap screws are usually shorter than the overall length of SAE flange complete set.

SAE Flanges are built in two different code designs which are code 61 and code 62. The following is a summary table: Description

Flat Side SAE Flange

It is a static face seal that seals the flange with a high durometer O-ring. Metal-to-metal interactions on the flange's outer face will produce leakage. As a result, the O-ring sealing is compressed between the flat face and the O-ring face, resulting in a reliable soft sealing. Flanges utilize an O-ring to seal a connection and keep pressurized fluid in place. The following table is the materials used for seals of flanges:

O-ring Side SAE Flange

SAE Flanges are used for high pressure hydraulic applications. In order to use and assemble SAE Flanges safely, it is important to know the correct procedures and torque range for assembly.

STEP 1

• Ensure the sealed surface is free from scratches and contamination.
• Lubricate the O-ring surface with system fluid or a compatible lubricant.

STEP 2

• Position the flange.
• Place the washer on the cap screws and bolt them through the bolt holes.

STEP 3

• Tighten the cap screws by hand.
• Torque the cap screws gradually in a diagonal sequence to the level in the torque table below.

STEP 4

• Tighten the cap screws according to the torque table below.

3000 PSI Series (Code 61) Flange Recommended Screw Torque Table

6000 PSI Series (Code 62) Flange Recommended Screw Torque Table

* Tolerance: max. 10%, min. 0%

Product Catalogue in pdf:

Hydraulic SAE Flanges

Product Literature in pdf:

B/W SAE Flanges

3000 PSI Series (Code 61) Screw Torque:

6000 PSI Series (Code 62) Screw Torque: