Product Overview
Inpro/Seal 1987-A-M0036-0 Non-Contact Bearing Isolator, 3.125 in Shaft in a 4.125 in Bore
Condition
Unused, New Old Stock; clean and in excellent condition. The bronze body photographs bright, with the original machining lines still crisp across the flange and the black elastomer rings seated down in their grooves. A machined slot is cut into the outer rim, and the face is etched with the Inpro/Seal logo and a job number - the unit photographed reads J009454674, matching the label on its own box. We have more than one of these in stock, so the job number on the one that ships to you may read differently; the part number, shaft and bore are what you are buying. It comes in the manufacturer box, in its bubble wrap sleeve, with the folded Standard Bearing Isolator installation instruction sheet. The box shows storage wear: scuffing, dust, and a torn label at one corner. Opened only for inspection and photos.
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Product Overview
The Inpro/Seal 1987-A-M0036-0 is a compound labyrinth bearing isolator built to hold lubricant in and keep contamination out of rotating equipment. The end-of-box label states the fit in plain terms - Shaft = 3.125, Bore = 4.125 - so it seats in a 4.125 in bore around a 3.125 in shaft. Rotor and stator do not touch, which means no rubbing lip to wear out and no contact face to replace on a schedule; it is rated IP66 for dust-tight and water-resistant protection. That same label records the elastomer components as ORB-044, ORV-235 and ORVM-3X83, a manufacturing date of 10/16/2014, a printed expire date of 10/16/2034, and MADE IN THE USA. The instruction sheet packed in the box carries the Inpro/Seal logo and the Waukesha Bearings line. Sold as a single isolator.
Key Features
- Inpro/Seal part number 1987-A-M0036-0
- Shaft 3.125 in, bore 4.125 in, both printed on the box label
- Non-contact compound labyrinth design, no rubbing lip and no wear surfaces
- Rated IP66 for dust-tight and water-resistant protection
- Bronze body with black elastomer rings seated in machined grooves
- Elastomer components listed on the box: ORB-044, ORV-235, ORVM-3X83
- Job number etched on the face and printed on the box label - the unit photographed reads J009454674
- Manufacture date 10/16/2014, made in the USA
- Suits motors, gearboxes, pumps and pillow blocks
- Works with grease and non-flooded oil systems
- Installs slip-on or with an adapter
Applications
- Plant millwright replacing a lip seal that keeps weeping on a 3.125 in motor shaft
- Pump technician rebuilding a bearing housing and wanting the grease to stay where it was packed
- Maintenance crew sealing a gearbox that gets hosed down at the end of every shift
- Reliability engineer converting pillow blocks to non-contact sealing one position at a time
Frequently Asked Questions
Will it fit my housing?
Fit comes down to two numbers, both printed on the box label: 3.125 in shaft, 4.125 in bore. Measure your shaft and your housing bore before ordering. Fit to any particular OEM motor frame or pump model is not confirmed here - check the dimensions and the packed installation sheet against your equipment before you install.
What is in the box?
Exactly what the photos show: the one isolator, its bubble wrap sleeve, the original Inpro/Seal box, and the folded Standard Bearing Isolator installation instruction sheet. No adapter, no mounting hardware, no spare elastomer kit.
The label shows an expire date of 10/16/2034. What does that mean?
The end-of-box label prints MFG Date 10/16/2014 and Expire Date 10/16/2034, the manufacturer dating that goes with the elastomer components. We have not tested or re-certified those rings. In the photos they sit fully seated and look supple, but if the application is critical, inspect them at installation or order fresh elastomers against the ORB-044, ORV-235 and ORVM-3X83 numbers on the label.
Why a non-contact isolator instead of another lip seal?
A lip seal rides on the shaft, so it wears, it heats, and sooner or later it leaks. A compound labyrinth isolator runs with clearance between rotor and stator, so nothing rubs and nothing wears in normal service. That is the trade a lot of plants make once the same lip seal has come back on the same machine three times.
Why buy this isolator instead of chasing a surplus seal lot?
Because you know exactly what shows up: part number 1987-A-M0036-0, shaft and bore printed on its own box, photographed from six angles before you commit. An auction pallet of unmarked seals is cheaper per piece and worth nothing if none of them fit a 4.125 in bore. This one clears our free shipping line on its own, and orders leave the Idaho warehouse the same or next business day.
Bronze, no rubbing lip, nothing in it designed to wear out - a seal meant to outlast the bearing it guards. It has been sitting boxed since 2014 waiting on a shaft to spin inside it, and which shaft that is happens to be your call.
