Weight bench attachment compatibility cannot be established from one tube measurement. The receiver, insertion depth, pin alignment, support arrangement and movement clearance all need to match the intended bench and attachment. SKEISO identifies the AH04 leg developer and AH05 preacher pad as compatible options for the JXS-037C, but that does not establish cross-brand compatibility. If you are asking about the bench's port size, first clarify which opening you mean. A receiver opening, attachment tube and weight-plate sleeve are different measurements and cannot answer the same question.
Name the port before measuring it
A customer may use 'port' to mean the bench's attachment receiver, the tube inserted into it, a locking-pin hole or a plate-loading sleeve. Begin with a photograph pointing to the specific component. Otherwise, even an accurately measured number can answer the wrong question.
For a receiver, distinguish its internal opening from the external size of the surrounding tube. A nominal frame-tube dimension is not the usable opening. Do not subtract an assumed wall thickness or infer a fit from a perspective photograph.
Check alignment and engagement, not just width
Two components can have similar widths yet differ in hole position, hole shape, insertion depth or the way they are supported. An attachment must engage and secure in the manner intended by the manufacturer. Sliding partly into an opening is not a compatibility test.
Do not drill new holes, substitute a different pin or use packing material to make an unverified combination fit. Ask the manufacturers about the exact model and revision. If they cannot confirm the combination, treat compatibility as unresolved rather than converting approximate measurements into approval.
The installed position must still work
A mechanically compatible attachment can change the space around the bench. A preacher pad projects above the front support; a leg developer adds rollers, a moving lever and a loading sleeve. Consider entry, exit, adjustment access and the movement's required clearance.
Check the intended configuration rather than assuming all optional attachments can be used together in every position. Photos showing individual accessories should not be read as instructions for simultaneous installation. Follow the current bench and attachment documentation.
Use model-specific options as the starting point
For the JXS-037C, the AH04 and AH05 are separately identified compatible options. The AH04 adds a plate-loaded leg developer; the AH05 supplies a preacher support pad for suitable curl setups with separate weights. Their different functions are a reason to choose deliberately, not to assume both are needed.
Bench Only does not include either option. Check the selected configuration and its named contents before ordering. A photograph of a bench carrying an attachment illustrates that setup; it does not change the contents of another configuration.
What to send for a compatibility check
Provide the bench model, attachment model, a clear image of the receiver and pin area, and the manufacturer's available dimensions. Specify the function you want and any other accessory you plan to leave installed. If a measurement is supplied in inches, label it as internal or external and identify its endpoints.
This guide does not publish an unverified JXS-037C receiver size or promise a third-party fit. Ask SKEISO for the exact current measurement and compatibility confirmation before buying a non-listed attachment. A short confirmation now is more useful than discovering after delivery that a tube fits but the locking arrangement does not.
Product details and next step
Compare the JXS-037C's named AH04 and AH05 options, or contact SKEISO with the exact attachment details for a model-specific compatibility check. See the JXS-037C product specifications, configuration choices and linked manual.
For related planning, read our JXS-037C base-bench and attachment guide.
Prepared by SKEISO Fitness. Model-specific statements refer to the current SKEISO product information. The cover is an AI-created editorial concept, not a product photograph, dimension drawing or included-equipment list. The body photograph shows the identified showroom configuration.
