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If the seal is being fitted to original equipment you may have some influence over the shaft and housing bore finish, but if you are replacing a worn seal you still need to take into account the condition of these 2 essential parts. Check for sharp edges and burrs – particularly on the shaft and housing chamfers or you could ruin the seal before you start up. If the shaft is too worn consider using an M Barnwell Services Shaft Repair Kit.
The dimensions of the 25x47x7 oil seal refer to its inner diameter, outer diameter, and thickness, respectively. These measurements are important in ensuring a proper fit for the seal in the machine or engine it is intended for. By providing a secure seal between moving parts, the oil seal helps to maintain proper lubrication in the machine and prevent the loss of oil.
Oil seals can offer:
The Ultimate Guide to Oil Seals
Nitrile is suitable for environments that have a temperature range of -30 degrees Fahrenheit to 250 degrees Fahrenheit. It is compatible with a variety of fluids, such as hot & cold water, silicone oil, animal & vegetable fat, hydraulic fluid, and gas oil. Nitrile is also a perfect material to use for any application that needs shock absorbers as it’s resistant to grease and abrasion.
Floating oil seals are also highly resistant to heat and abrasion, which makes them well-suited for use in demanding applications. Whether operating in extreme temperatures or harsh conditions, these seals can withstand the rigors of the environment without compromising their sealing performance. This makes them an ideal choice for industries such as mining, construction, and agriculture, where equipment is subjected to heavy loads and constant wear.
floating oil seal

Table 7 shows the shaft design checklist.
Polyurethane