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Steel SAE 4-Bolt Flange Adapter, 3.50 Inch Code 61 Flange, O-Ring Half To 3.50 Inch Pipe, Flat Socket Weld

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Description & Features

Designed for connecting Code 61 flanged lines to 3.50 inch pipe, this Steel SAE 4-Bolt Flange Adapter, 3.50 Inch Code 61 Flange, O-Ring Half To 3.50 Inch Pipe, Flat Socket Weld is manufactured by Anchor Fluid Power in steel construction for reliable performance in hydraulic systems under demanding industrial conditions.

The flat socket weld end accommodates 3.50 inch pipe, while the O-ring half face seals against the mating flange pad. Each unit ships complete with mounting bolts, lock washers, and a Buna-N O-ring, eliminating the need to source hardware separately. The 4-bolt SAE Code 61 flange pattern provides a secure, leak-resistant connection suitable for high-pressure hydraulic circuits.

With a pad size of 3.5 and a bore dimension of 3.502 inches, this adapter is built to SAE Code 61 standards and is compatible with corresponding Code 61 flange halves and split flanges in the same size class.

SKU: W72-56-56U

Supplier Part Number (MPN): W72-56-56U

Alternate Part Numbers: C1JR15, W72-56-56-U, W725656U

Specifications

Brand
ANCHOR FLUID POWER
a Dimensions
5-1/2 in
b Dimensions
6 in
c Dimensions
2-3/4 in
Connection Type
Flanged, Socket Weld
Connection Type 1
SAE Code 61 O-ring Flange
Connection Type 2
Socket Weld Pipe
d Dimensions
4-3/4 in
Dimensions
5.5 in L x 1.44 in W x 6 in H
f Dimensions
1.19 in
Fitting Type
Flange
Flange Size
1.19 in THK
g Dimensions
4.095 in
h Dimensions
3.502 in
k Dimensions
0.656 in
Material
Steel
Material Construction
Steel
Maximum Operating Pressure
500 psi
Series
W Series
Thread Sealant
Without Thread Sealant

Product Questions & Answers (2)

Question by: Curt E on Sep 18, 2025, 10:26 AM
Does this adapter come with everything you need to bolt it up, or do you have to go hunt down hardware separate?
Answer by: Customer Support on Sep 19, 2025, 8:01 PM
Everything ships together in the box. You get the mounting bolts, lock washers, and a Buna-N O-ring already included, so there's no extra trip to the supply house before you can get it installed.
Question by: Joyce B on Mar 8, 2026, 7:02 PM
got a 3.5 inch code 61 flange line, does this adapter take me over to 3.5 pipe with a socket weld end?
Answer by: Customer Support on Mar 10, 2026, 1:08 PM
Built for that exact changeover, it mates a 3.50 inch SAE Code 61 4-bolt flange on the hydraulic side to a 3.50 inch pipe socket weld end on the other side, using an O-ring half face seal at the flange pad.

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