RHPLJT2.1/4Inch Series Single Row Angular Contact Ball Bearing 2-1/4 x 4-1/2 x 7/8 in, Open

Product Description

What this part is

RHP LJT2.1/4 inch-series single-row angular contact ball bearing. Bore: 2-1/4 in (57.15 mm). Outside Diameter: 4-1/2 in (114.3 mm). Overall Width: 7/8 in (22.225 mm). Number Of Rows: 1. Rolling Elements: Balls. Closure Type: Open, no seal and no shield. Bearing Material: Through-hardened bearing steel. Design Units: Inch. The raceways are offset with one high and one low shoulder on each ring, so the bearing carries radial load together with axial load in one direction and runs against an opposing bearing or a locating bearing elsewhere on the shaft.

Decoding the designation

Part Number: LJT2.1/4. LJT is RHP’s inch-series single-row angular contact ball bearing family; the LJ prefix is the inch-series deep groove family on the same imperial envelope range. 2.1/4 is the bore in inches, 2-1/4 in, written with the full stop RHP uses in inch designations. The M and MB suffixes denote the machined brass cage variants of this size.

What these specs mean in practice

Dynamic Load Rating: approximately 65.5 kN. Static Load Rating: approximately 48.2 kN. Limiting Speed, grease: approximately 3,200 r/min. Limiting Speed, oil: approximately 6,400 r/min. Item Weight: approximately 1.09 kg. The inch envelope is the reason this bearing exists in a market otherwise dominated by metric sizes: a 2-1/4 in bore is 57.15 mm and a 4-1/2 in outside diameter is 114.3 mm, figures no metric bearing lands on, so legacy British and imperial machinery takes an inch-series bearing. Oil lubrication roughly doubles the permissible speed over grease.

Quantity and configuration

Unit Quantity: 1 Pc. Single bearing, sold as an individual piece. Arrangement: axial load in one direction, mounted against an opposing bearing or a shoulder that locates the shaft. Lubricant: preservative as supplied; grease or oil before running.

Interchange guidance

RHP was acquired by NSK, and RHP-designated inch bearings are catalogued and supported through NSK. Cross-references: NSK LJT2.1/4; RHP LJT2.1/4M and RHP LJT2.1/4MB (machined brass cage variants); RHP LJ2.1/4 (related size, inch-series deep groove, not an angular contact substitute). Searchable forms of the designation: LJT2.1/4, LJT 2.1/4, LJT2-1/4, LJT 2 1/4, LJT21/4.