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Gearmotors: What They Are and How to Size a Replacement
Many industrial loads need torque an electric motor can’t deliver on its own, at a
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Open single-row deep groove ball bearing, 1-1/8 in bore x 2-1/2 in OD x 5/8 in wide (28.575 x 63.5 x 15.875 mm), Cr 20.2 kN, C0r 11.3 kN, normal clearance.
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| MFR / Brand | RHP |
|---|---|
| MPN | LJ1.1/8 |
| Model | LJ 1 1/8 |
| Bearing Type | Ball Bearing |
| ID | 1.1250 in |
| OD | 2.5000 in |
| Width | 0.6250 in |
| Base Number | RLS9 |
|---|---|
| Industry Terms | imperial ball bearing; inch ball bearing; RHP light series; ball journal bearing; deep groove ball bearing; open bearing; BS292; British Standard bearing; imperial deep groove; RLS series |
| Total Width | 0.6250 in (5/8 in) / 15.875 mm |
| Bore Shaft Size | 1.1250 in (1-1/8 in) / 28.575 mm |
| Mpn Variants | LJ-1-1/8; LJ1-1/8; LJ1.1/8; LJ 1.1/8; LJ1 1/8; LJ11/8; LJ1.1/8J; LJ1-1/8J |
| Manufacturer Status | RHP brand absorbed into NSK and traded as NSK-RHP; the imperial LJ series remains catalogued. RHP to NSK is a brand succession, not a substitution. |
| Compatible With Replaces | Replaces RHP LJ1-1/8, LJ1.1/8, LJ1.1/8J, SKF RLS 9, NKE LJ1.1/8 and any 1-1/8 x 2-1/2 x 5/8 in open imperial single-row deep groove ball bearing of normal clearance |
| Precision Class | ISO Normal / ABEC 1 |
| Cage Type | Rolling-element centred, pressed |
| Dynamic Load Rating | 20,200 N (20.2 kN) Cr, per bearing |
| Static Load Rating | 11,300 N (11.3 kN) C0r, per bearing |
| Precision Rating | ISO Normal / ABEC 1 |
| Rolling Elements | Balls |
| Item Weight | 0.219 kg (0.483 lb) |
| Cage Material | Pressed steel |
| Limiting Speed | 11,700 rpm grease / 15,500 rpm oil |
| Number Of Rows | 1 |
| Internal Clearance | CN (normal) |
| Design Units | Imperial (inch) |
| Bearing Material | Through-hardened bearing steel |
| Series | LJ — RHP imperial light series single-row radial ball journal |
| Part Number | LJ-1-1/8 |
| Common Misspellings | RPH LJ1.1/8; RHP LJ1.18; RHP LJ-11/8; RHP LJ1 1/8 |
| Closure Type | Open — no shields, no seals |
| Cross Reference 1 | SKF RLS 9 - Cr 20.3 kN, C0r 11.2 kN |
|---|---|
| Cross Reference 2 | NKE LJ1.1/8 |
| Cross Reference 3 | RHP LJ1.1/8J - same bearing, J cage suffix |
| Cross Reference 4 | LJ1-1/8-2RS / RLS9-2RS1 - sealed both sides |
| Cross Reference 5 | LJ1-1/8-ZZ / RLS9-2Z - shielded both sides |
| Cross Reference 6 | MJ1-1/8 / RMS9 - medium series, larger OD and width |
RHP LJ1.1/8 is a single-row deep groove (radial) ball bearing from RHP’s imperial LJ light series, open type with no shields or seals. Size: 1-1/8 in bore, 2-1/2 in outside diameter, 5/8 in width (28.575 x 63.500 x 15.875 mm). Each unit is one bearing. Unit Quantity: 1 Pc.
LJ — RHP light series, single-row radial ball bearing (J for ball journal).
1-1/8 — bore in inches; RHP writes it LJ1.1/8, and LJ-1-1/8 and LJ1-1/8 are the same bearing.
No closure suffix — open bearing, normal (CN) radial internal clearance.
RLS9 — the industry base number for this envelope, used by SKF (RLS 9).
Bore Diameter: 1.1250 in (28.575 mm). Outside Diameter: 2.5000 in (63.500 mm). Width: 0.6250 in (15.875 mm). Dynamic Load Rating Cr: 20,200 N per bearing. Static Load Rating C0r: 11,300 N per bearing. Limiting Speed: 11,700 rpm grease; 15,500 rpm oil. Internal Clearance: CN. Number of Rows: 1. Rolling Elements: Balls. Cage Material: Pressed steel. Cage Type: Rolling-element centred. Precision Class: ISO Normal / ABEC 1. Item Weight: 0.219 kg (0.483 lb). Country of Origin: United Kingdom.
Bore: 1.1250 in (28.575 mm) for an inch shaft. Outside Diameter: 2.5000 in (63.500 mm). Width: 0.6250 in (15.875 mm).
Cross-references: SKF RLS 9 (Cr 20.3 kN, C0r 11.2 kN); NKE LJ1.1/8; RHP LJ1.1/8J (same bearing, J cage suffix). Sealed and shielded versions on the same bore and OD: LJ1-1/8-2RS / RLS9-2RS1 (sealed both sides) and LJ1-1/8-ZZ / RLS9-2Z (shielded both sides). MJ1-1/8 / RMS9 is the medium series on the same bore with a 2-13/16 in OD and 13/16 in width. RHP is part of NSK and traded as NSK-RHP.
1-1/8 in bore x 2-1/2 in outside diameter x 5/8 in width (28.575 x 63.500 x 15.875 mm).
Open. It has no shields or seals; the sealed version is LJ1-1/8-2RS and the shielded version is LJ1-1/8-ZZ.
SKF RLS 9, which shares the 1-1/8 x 2-1/2 x 5/8 in envelope. SKF publishes Cr 20.3 kN and C0r 11.2 kN for it.
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