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SKF Rotary Shaft Seal: 2 Lip w/Spring, CRWA1, Nitrile, 3.125 in ID, 4.003 in OD - Dual-Lip Oil Seals with Metal Cases for Smooth Bores
SKFDual-Lip Oil Seals with Metal Cases for Smooth Bores

SKF Rotary Shaft Seal: 2 Lip w/Spring, CRWA1, Nitrile, 3.125 in ID, 4.003 in OD

The SKF Rotary Shaft Seal is a dual-lip oil seal with a metal case for smooth bores, featuring a CRWA1 seal design and a spring-loaded 2-lip configuration. This inch-system seal has a 3.125-inch inner diameter, a…

SKU 3G-OTH-123872

Brand
SKF
Item
Rotary Shaft Seal: 2 Lip w/Spring, CRWA1, Nitrile, 3.125 in ID, 4.003 in OD
Category
Dual-Lip Oil Seals with Metal Cases for Smooth Bores
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Technical Specifications

SKF
Manufacturer Part Number
31139
Type
CRWA1, Nitrile
OD
4.003 in
Wd
0.375 in
ID
3.125 in
Seal Design
CRWA1
System of Measurement
Inch
View Full Spec Sheet

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SKF Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The SKF Rotary Shaft Seal is a dual-lip oil seal with a metal case for smooth bores, featuring a CRWA1 seal design and a spring-loaded 2-lip configuration. This inch-system seal has a 3.125-inch inner diameter, a 4.003-inch outer diameter, and a 0.375-inch width, constructed from nitrile material (MPN 31139).

Frequently Asked Questions

What is the SKF CRWA1 rotary shaft seal used for?

The SKF CRWA1 rotary shaft seal is a dual-lip oil seal with a metal case designed for smooth bores. It retains lubricants and excludes contaminants in rotating shaft applications such as gearboxes, pumps, and motors. The spring-loaded 2-lip configuration provides reliable sealing under moderate pressure and speed conditions.

What are the specifications of the SKF 31139 rotary shaft seal?

The SKF 31139 rotary shaft seal has a 3.125-inch inner diameter, a 4.003-inch outer diameter, and a 0.375-inch width. It features a CRWA1 seal design with a dual-lip, spring-loaded nitrile construction and a metal case for smooth bores. This inch-system seal is manufactured by SKF under MPN 31139.

Where to buy SKF rotary shaft seals worldwide?

You can source SKF rotary shaft seals, including the CRWA1 model, through 3G Electric. As a global industrial equipment distributor since 1990, 3G Electric handles full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time on this SKF part.

How to install an SKF dual-lip oil seal with a metal case?

To install an SKF dual-lip oil seal, ensure the bore is smooth and clean. Use a seal driver or press to apply even force on the metal case outer diameter, never on the sealing lips. Lubricate the shaft and seal lips before installation. Avoid cocking the seal; press it squarely to the correct depth.

Used in

Common applications for SKF
Heavy machinery gearboxes — SKF spherical roller bearings (e.g., 24056 CCK30/W33) for high radial load capacity
Electric motor repair — SKF cylindrical roller bearings (e.g., NJ 307 ECP/C3) for free axial expansion
Pump shaft sealing — SKF CRWA1 rotary shaft seals (e.g., 17100) for fluid retention in rotating equipment
Conveyor system maintenance — SKF wear sleeves (e.g., 99274) to protect shafts from seal abrasion
Machine tool spindles — SKF angular contact bearings (e.g., 7413 BGBM) for axial load support in duplex sets
Industrial fan assemblies — SKF spherical roller bearings (e.g., 23044 CC/W33) for misalignment accommodation

SKF Products

3G Electric supplies SKF dual-lip oil seals with metal cases for smooth bores. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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