SKF 20X26X4 HM4 R radial shaft seal
- Brand
- SKF
- Category
- Seals
- Subcategory
- Radial shaft seals
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Description
SKF 20X26X4 HM4 R belongs to radial shaft seal, part of our Seals range. Tell us how many you need by WhatsApp or email and we'll get back to you promptly with a quote for 20X26X4 HM4 R and any equivalents.
SKF HM R radial shaft seals are lip seals used on rotating shafts to keep lubricant in and contaminants out. You will find them in gearboxes, pumps, electric motors and reducers. The HM code points to a single lip with a steel spring, and the trailing R means the outer diameter carries a coating. Standard metric sizes run from 6 mm to 15 mm bore with cross-sections of 2 to 3 mm, which suits tight spaces and moderate speeds.
Reading the code is straightforward. A designation such as 6X12X2 HM3 R breaks down as: shaft 6 mm, housing 12 mm, width 2 mm, HM3 lip, R coating. The HM part tells you the lip is rubber backed by a steel spring, and the digit after it (3 or 4) marks a difference in lip geometry. The R at the end confirms a coated outer diameter that helps seal against the housing bore.
These seals fit where axial room is short but sealing still matters. Typical spots include small electric motors, low-capacity centrifugal pumps, speed reducers, machine tools and transmission units. They also show up in power tools, household appliances and centralized lubrication systems. Because they are compact, they work well on small shafts such as fans, agitators and precision mechanisms.
Selection starts with matching shaft and housing diameters to the designation. The lip needs a ground, lubricated surface to run on; a worn shaft may call for a repair sleeve. Before assembly, coat the lip with a compatible grease to avoid startup damage. Shaft-to-housing alignment matters: misalignment beyond 0.1 mm speeds up wear. The spring supplies contact pressure, so leave it in place and do not deform it during installation.
For cross-reference, SKF HM R seals can be swapped with other makers' standardized sizes, including DIN 3760 or ISO 6194 profiles. Even so, lips differ: check the elastomer (NBR, FKM) and the temperature range before substituting. Matching dimensions alone does not mean matching behavior. When unsure, ask your supplier or send a photo of the original part.
To get a quote, send the full part number by WhatsApp or email to MR Industrial Accessories. If you do not have it, give us the shaft, housing and width measurements and we will help identify it. We supply the SKF line along with other options so you can find the right fit for your equipment.
Dimensions
Dimensions and tolerances: Message us the part number on WhatsApp and we'll verify its dimensions and version with the manufacturer's datasheet.
Frequently asked questions
- What does the HM designation mean in an SKF seal?
- HM indicates a rubber lip with a steel spring. The number that follows (3, 4) identifies variants in the lip geometry. The final R indicates that the outer diameter has a coating.
- How do I choose the seal if I don't have the part number?
- Measure the shaft diameter, the housing diameter and the seal width. With these three measurements we can identify the equivalent designation. You can also send us a photo of the original part.
- Can they be replaced by seals from other brands?
- Yes, if the standardized measurements match. But verify the elastomer type and the temperature range, because not all lips are the same. Dimensional interchangeability does not ensure the same performance.