Here you go:
NAPA Gold 1259 is a 10 micron element in 1-12 thread, easy to obtain, around $10-$15, and good quality.
Cut and pasted from a file.
I am assuming you are referring to a spin-on can filter element. Most are built to one or the other of two standards: SAE standard US threads on center post, or ISO with metric threads on center post.
Some common SAE mounts are:
1. ¾-16 center thread (filter about 3 inches OD). This is visually similar to the common Ford/Chrysler engine oil filter mount. Do NOT interchange the two. Engine filters usually have a bypass valve and anti drainback check built into the element. Hydraulic filters have bypass built into the head, not the element. This size filter is usually only for pilot lines and small flow applications. (There are also many other standard threads used for engine oil filter mounts.)
2. SAE 1 inch-12 threads/inch center thread (filter about 3.8 inches OD) This is by far the most common small flow spin on filter used on mobile or stationary equipment. Almost all the major equipment and filter manufacturers have this in the lineup.
Hydraulic filters almost always have a bypass built into the mounting head. I am not aware of any spin on hydraulic elements that have bypass built into the element. However, before substituting an element, check your filter head to make sure there is a bypass in place, all pieces there, and functioning. Also check that the head was installed in the correct direction. Seems like a ‘duh’ task, but I have seen two different situations where the OEM manufacturer installed heads backwards.
NAPA Gold 1259 is a 10 micron element in 1-12 thread, easy to obtain, around $10-$15, and good quality.
Another NAPA listing I have has #1551 10 micron, #1552 20 micron, and #1553 33 micron. I would not use any of these. I would not use anything greater than 10 micron for a return filter, and 20 or 33 micron are much too fine for a suction filter. Also, the 15xx are cheaper, so I assume they are cellulose (paper) elements. I think the Gold series is microglass fiber but not sure. Almost all of the industrials hydraulic filter manufacturers have gone to microglass media many years ago. Paper was the best available for many years, but now is only used for the lowest possible cost applications.
3. 1.50 -16 center thread (filter about 5.1 inches OD) for larger flows. There are different versions (not interchangeable) of metal shell and outer gasket design. Some are flat gaskets, similar to the common 1-12 mount, and some have L shaped gaskets. These are often called Gresen, or Cross, or Donaldson, or Vickers designs, after the original vendors names. I don’t have NAPA cross references for those.
4. There are also metric threaded center posts built by various Italian and European manufacturers, in sizes approximately 1 inch (25 or 26 mm) and 1.5 inch (35 to 40 mm). Won’t address here. Just be aware if the filter is not quite right for the SAE threads it may be metric.
kcj
