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SKF roller chain sprockets use the PHS prefix. The part number tells you the chain it fits, the number of strands, the hub style and the tooth count. Because every combination gets its own part number, the line is very large, so have those four details clear before you start searching.
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Take PHS 25-1B9: 25 is the chain size, 1 means a single strand, B is the sprocket style and 9 is the tooth count. PHS 25-1A18 fits the same chain, has 18 teeth and is style A, a plate with no hub. Style B has a hub on one side. Chain sizes with a B in them, such as PHS 05B-1B10, follow the European standard and will not mesh with American standard chain.
In PHS 06B-1TB26 the style is replaced by TB, meaning the sprocket takes a taper bushing; the bushing is ordered separately and sets the bore. In PHS 10B-3C76, the 3 stands for three strands and the C for another hub style. Letters at the end, such as SS, mark a different execution of the same geometry.
You can spot a worn sprocket by its thin, hooked teeth. A new chain on that sprocket will stretch in short order, and a new sprocket on a worn chain runs into the same problem. If the drive has a lot of hours on it, quote the whole set: both sprockets plus the chain.
Changing the tooth count changes the ratio, but it also changes the sprocket diameter and the chain length you need. Before ordering a sprocket with a different number of teeth, make sure it fits the available space and that the tensioner still has travel.
Send the full PHS part number and the quantity. If you don't have it, give us the chain pitch or chain designation, the number of strands and teeth, the shaft diameter and keyway, and the hub width and diameter. Tell us whether the sprocket takes a taper bushing, comes with a finished bore or is to be bored, which saves back and forth. A front photo and an edge photo are enough to identify the style.
No, it is the tooth count. The diameter follows from the tooth count and the chain pitch.
It means the sprocket mounts with a taper bushing. The bushing has its own part number, chosen for the shaft.
No. They come from different standards, and the pitch and width don't match.
Can't find the exact model? Tell us the part number or model you need. We'll track it down and quote it, whether or not it appears in our catalog.
SKF PHS series sprockets are toothed wheels that mount on shafts and mesh with ANSI pitch chains to transmit motion and force in industrial machinery. They suit drives that call for a precise ratio and straightforward maintenance. MR Industrial Accessories supplies this line as part of its power transmission range and can help you match pitch and tooth count to your application.
Example part numbers:PHS 25-1B9PHS 25-1B10PHS 25-1B11PHS 25-1B12PHS 25-1B13
SKF PHS series sprockets are precision toothed wheels designed for chain transmission. They mount on shafts and transfer rotary motion through a roller chain. Common applications include machine tools, packaging equipment, conveyors and general transmission systems. Their design promotes smooth meshing and long service life when selected and installed correctly.
Example part numbers:PHS 05B-1B10PHS 05B-1B11PHS 05B-1B12PHS 05B-1B13PHS 05B-1B14
For roller chain drives with an 8 mm pitch, single strand, SKF offers the PHS 25-1A series of sprockets. These toothed wheels link parallel shafts in industrial machinery, and MR Industrial Accessories LLC supplies them within its power transmission selection. The team can help you determine the right tooth count and hub style for your specific setup.
Example part numbers:PHS 25-1A18PHS 25-1A19PHS 25-1A20PHS 25-1A21PHS 25-1A22
The manufacturer part number is all we need: we'll quote it and share dimensions and equivalents via WhatsApp or email.
