SKF 12638 CR / HMS / HMSA radial shaft seal
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Product Description
SKF 12638 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.
Technical Specifications
- Type
- CR / HMS / HMSA radial shaft seal Designation: SKF 12638 HS code: 4016.93 Shaft diameter: 31.75 mm Housing bore diameter: 63.5 mm Seal width: 7.87 mm Limiting speed: 12091 r/min Maximum operating temperature: 200 °C minimum operating temperature: -25 °C Permissible circumferential speed: 20.1 m/s Rotational speed: 12091 r/min Design: CRW1 Auxiliary lip: No Sealing lip material: Fluoro rubber (FKM) Type of outside diameter: Metal-cased with sealant coating on the outside diameter Unit system: Inch Product net weight: 0.023 kg eClass code: 23-07-08-01 UNSPSC code: 31181602
Standards & Compliance
- Standard
- SKF designation convention (see description for governing ISO / DIN)
- Material
- As declared by SKF designation suffix
- Temperature Range
- Per SKF product data
- HS Code
- 4016.93
Cross References
- Freudenberg 12638
- Trelleborg 12638
- Chesterton 12638
- Garlock 12638
- National 12638
- Equivalent: 12638 (Freudenberg)
- Equivalent: 12638 (Trelleborg)
- Equivalent: 12638 (Chesterton)
- Equivalent: 12638 (Garlock)
- Equivalent: 12638 (National)
Compatibility & Fitment
Interchange with peer OEM equivalents on identical boundary plan and execution — confirm cage, clearance, sealing and precision-class suffix before substitution.
Product Documentation
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Technical guides
Catalogue entry last verified: 2026-08-30. A manufacturer datasheet is attached to this entry — confirm application-critical values against it.
Frequently asked questions
- Where can I buy 12638?
- 12638 can be ordered from cballast.com as a SKF catalogue item: request a quotation on this page or email sales@cballast.com, and the order ships worldwide.
- What is the manufacturer part number for this SKF product?
- The manufacturer part number is 12638.
- What is the HS code for 12638?
- The customs tariff (HS) code for 12638 is 4016.93.
- Who manufactures 12638?
- 12638 is a SKF product in the Seals & Gaskets range.
- Is a datasheet available for 12638?
- Yes — the 12638 datasheet can be viewed and downloaded on this page.
- What is the minimum order quantity for 12638?
- The minimum order quantity is 1.
- Is 12638 available?
- Yes — 12638 is available to order: fulfilment is from supplier stock in cBallast's European network, dispatched directly from the warehouse to the customer, with the exact lead time stated in the quotation (reply within 24 hours).