SKF 4991 — CR / HMS / HMSA radial shaft seal
SKF · Seals & Gaskets · Radial Shaft Seals
SKF 4991 cr / hms / hmsa radial shaft seal. SKF radial shaft seal for rotating-shaft primary containment against dust, splash and low-head oil pressure. Designation CR / HMS5 / HMSA10 / HMSA10RG (single lip, single lip with dust lip, double lip with garter spring). Elastomer standard nitrile (NBR) to ISO 6194-1 with metal case; hydrogenated nitrile (HNBR), fluoroelastomer (FKM / Viton), silicone (VMQ) and polyacrylate (ACM) available by suffix. Bore, outside diameter and width follow ISO 6194 / DIN 3760. Designation follows the SKF alphanumeric identification convention where the numeric block encodes the boundary plan and the suffix declares execution options (material, sealing, cage, precision, clearance, lubricant). Genuine SKF supply carries the SKF logo etch or moulded mark and hologram-authenticated packaging.
Specifications
- Part number
- 4991
- HS code
- 4016.93
- Material
- As declared by SKF designation suffix
- Temperature range
- Per SKF product data
- Standard
- SKF designation convention (see description for governing ISO / DIN)
Compatibility
Interchange with peer OEM equivalents on identical boundary plan and execution — confirm cage, clearance, sealing and precision-class suffix before substitution.
Also known as — OEM cross-references & superseded numbers
- Freudenberg 4991
- Trelleborg 4991
- Chesterton 4991
- Garlock 4991
- National 4991
- Competitor equivalent: 4991 (Freudenberg)
- Competitor equivalent: 4991 (Trelleborg)
- Competitor equivalent: 4991 (Chesterton)
- Competitor equivalent: 4991 (Garlock)
- Competitor equivalent: 4991 (National)
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