SealMasterLow-Base Two-Bolt Pillow Block Ball Bearing Unit, 2-3/8 in Bore, Setscrew Lock, 2-11/16 in Shaft Centreline, Cast Iron, Relubricatable

Product Description

What this part is

SealMaster NPL-38 mounted ball bearing unit. Bore: 2-3/8 in. Housing Style: two-bolt cast iron pillow block, low base, base mount. Insert: single-row self-aligning ball bearing with spherical outside diameter and extended wide inner ring, setscrew locked to the shaft. Base to Shaft Centreline: 2-11/16 in. Overall Housing Length: 9-1/2 in. Mounting Bolt Size: 5/8 in. Unit Weight: 13.5 lb. Series: NPL. Condition: new open box, new old stock, Gold Line, made in USA.

Decoding the designation

N: normal / standard duty. P: pillow block, the two-bolt base-mounted housing. L: low base, for a low shaft-to-base centreline. The number is sixteenths of an inch, so 38 = 38/16 = 2-3/8 in bore. Searchable forms: NPL-38, NPL38, NPL 38, Regal Rexnord item 7005955.

Housing style and bolt pattern

Two-bolt base-mount pillow block, bolting down onto a horizontal base alongside the shaft. The base holes are slots, giving a bolt-centre range of 6-7/8 in minimum to 7-5/8 in maximum on 5/8 in bolts — that adjustment is what lets a drive be tensioned or a conveyor shaft squared after the frame is drilled. Overall Housing Length: 9-1/2 in. Base to Shaft Centreline: 2-11/16 in. The NP housing on this bore sits at 2-3/4 in, so the NPL runs the shaft 1/16 in closer to the mounting surface.

What these specs mean in practice

Setscrew locking: hardened setscrews clamp the extended inner ring to the shaft, which is field-serviceable and tolerant of commercial shaft tolerances. Non-expansion: the insert is axially located in the housing, so on a two-bearing shaft this is the fixed position and the second position takes up thermal growth. Relubricatable: the insert carries a lubrication hole and locating dimple in the outer ring, so grease from the housing fitting reaches the raceway. The spherical seat lets the insert swivel in the housing, taking up initial shaft misalignment on an imperfect frame.

Materials and sealing

Housing Material: cast iron. Insert Material: 52100 bearing steel. Seal: felt, standard for the series. A single-lip contact seal is catalogued under suffix C, and a Hi-Temp seal rated 250–400°F is catalogued for this series.

Quantity and configuration

Price is per unit. Each ships complete as housing plus insert with setscrews fitted. Replacement Insert: SealMaster 2-26, a standard-duty single-lock insert with spherical outside diameter and extended inner ring.

Interchange guidance

SealMaster is a Regal Rexnord brand, and 7005955 is the Regal Rexnord item number carried alongside NPL-38. Older paperwork reads SealMaster Gold Line or Stephens-Adamson. Within SealMaster, NP-38 is the high-base version at a 2-3/4 in centreline and NPD-38 the double-lock version. Browning VPS-238 is a standard-base housing on the same bore. Suffix R on this series, as in NPL-20R, denotes a bore 1/16 in larger than standard.