SAE Socket Weld Flange

QS Flange: Xiamen Sae Sw Flange

SAE four-bolt socket weld flange: the pipe is fillet welded into the socket and an O-ring in the face groove seals the joint.

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One-Minute Overview

Four-bolt SAE flange with a socket weld hub for compact hydraulic connections.
The pipe end drops into the socket and is fillet welded, keeping the flange square.
An O-ring seated in the face groove does the sealing, not the bolts.
Common on mobile hydraulics, off-highway equipment, marine decks and test rigs.

An SAE socket weld flange brings a hydraulic pipe into a four-bolt connection without an adapter. The pipe end slips into the socket and is fillet welded around the hub, which holds the flange square to the pipe axis far more reliably than a butt weld on a short spool. Sealing happens at an O-ring seated in a groove on the face, so the joint stays compact, needs only four bolts, and can be opened for service without cutting the weld.

The pattern is compact by design: the bolts sit close to the bore, the flange body is shallow, and the whole joint fits where a full circular flange would foul a manifold, a hose run or a frame rail. Weld preparation matters more than torque here. The socket should be clean and dry, the pipe cut square, and the fillet weld run in one pass where possible so the hub does not distort the groove. Fit a new O-ring every time the joint is opened, keep the groove free of weld spatter, and cap the flange during storage. Typical use is mobile hydraulics, agricultural and mining equipment, marine deck machinery and test stands. Size, working pressure and O-ring material are confirmed per inquiry, and a detailed specification sheet is available on request.

FAQ

Q1. Why socket weld rather than a split flange clamped on the pipe?

A socket weld flange is one piece welded to the pipe, so there is no clamp to work loose under vibration and no risk of the halves creeping apart. The weld also takes the axial load, which leaves the four bolts doing only what they are good at - holding the O-ring compressed against the mating face.

Q2. How square does the pipe have to be before I weld it on?

Square enough that the flange face sits flat against its mate with the bolts sliding in by hand. Cut the pipe at right angles, deburr it, then tack and check the gap before running the full fillet. If the bolts need a pry bar, cut the tack and start again - it is quicker than fixing a leaking joint later.

Q3. Do I really have to pull the O-ring out before welding?

Yes, unless you enjoy replacing burnt rubber. Weld heat travels through the hub straight into the groove, and an O-ring left in place will harden or scorch before the weld cools. Take it out, weld, let the flange cool naturally, clean the groove, then fit a fresh ring.

Q4. How long will production take?

Standard sizes are typically ready within 30 days, and in-stock items ship immediately. Larger or custom orders get a confirmed date per order, because the schedule depends on quantity, material, the bolt pattern you specify, and how busy production is at the moment you order.

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