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Description
550 437 050 R21/SC Single Lip Nitrile Rotary Shaft Oil Seal with Garter Spring 4.3/8x5.1/2x1/2 InchSeals are ideal for excluding dirt, dust, water or any other contaminant whilst retaining lubricant in rotary shaft equipment. They are generally used as a means of protecting the bearings of rotating shafts. The term nitrile rubber is used for acrylonitrile butadiene rubber (NBR). This material has very good engineering properties and is a general purpose sealing lip material. It is a copolymer manufactured from acrylonitrile and butadiene that
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Best in 7 days
Best in 7 days
Best in 7 days
Best in 7 days
4.8 ★★★★★
Based on 1283 reviews
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Product Reviews
★★★★★ 5
Excellent, clean look
Style: 1-Speaker
Great wall plate for that clean, in wall wiring look. Easy to install and connections are solid.
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Reviewed in the United States on November 26, 2025
★★★★★ 4
Great...but could be a bit better
Style: 2-Speaker
Almost perfect. Easy to screw apart and insert wires to both the back and to the front, or do what I did and screw the wire onto the back and then use a banana plug for the front. My only complaints are that the back piece sits off the wall a little, so the plate doesn't fit flat and tight against the wall. It leave a little gap around the edges. The other complaint is that the back piece has some flex in it, which makes me nervous when I push plugs into and out of it. I think it probably will hold up fine, but it feels a little oogy to push banana plugs into it and see it flex. Comes with all the hardware needed. Just need a philips screwdriver and wire cutters and you're good to go. Super easy to use, and way better than the spring loaded connections it replaced.
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Reviewed in the United States on July 12, 2017
★★★★★ 5
Built well
Style: 4-Speaker
Still working great no issues with sound quality.
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Reviewed in the United States on April 17, 2026
★★★★★ 5
Really good wall plates
Style: 1-Speaker
These plates came on time, packaged well and are "doing the trick". The plates, while fairly light-weight are perfect for my new system. They installed into the junction boxes very easily, hold the wires snugly and the banana plugs are perfect for my usage.
If you need a nice, easy to install, good quality, wall plate, I would highly recommend these.
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Reviewed in the United States on November 30, 2025
★★★★★ 5
Is probably heaver than you think
Style: 4-Speaker
Quality is decent, weight is heavy, threads of the screw portion seem of quality
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Reviewed in the United States on March 18, 2026
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