What this part is:

SealMaster NP-9 is a mounted ball bearing unit: a two-bolt cast iron pillow block from the normal-duty Gold Line NP series, with a wide-inner-ring ball bearing insert on a spherical outer race, self-aligning in a one-piece housing. Two setscrews in the extended inner ring lock it to a 9/16 in shaft. Complete unit: housing, insert, felt seals and setscrews. Unit Quantity: 1 Pc.

Decoding the designation:

NP — normal-duty two-bolt pillow block housing (SealMaster MP, NP and MRP are pillow blocks; SF, SFT and FB are flange styles).

9 — bore size in sixteenths of an inch, 9/16 in shaft.

Specifications:

Shaft Size: 9/16 in. Housing Style: Pillow block, 2-bolt. Housing Material: Cast Iron. Bearing Material: 52100 chrome steel insert races. Locking Method: Two setscrews in the extended inner ring. Closure Type: Felt seals, both faces. Relubrication: Relubricatable via grease fitting. Lubricant: Grease. Expansion Type: Non-expansion (locating). Duty Type: Normal duty. Unit Quantity: 1 Pc.

Dimensions and mounting:

Bolt Hole Spacing, Center To Center: 3-3/4 in (95.25 mm). Bolt Size: 1/2 in. Base-To-Shaft Centre Height: 1-3/16 in (30.16 mm). Overall Length: 5 in. Overall Height: 2-7/16 in. Base Width: 1-1/2 in (38.1 mm). Number Of Bolt Holes: 2. The non-expansion insert is axially located in the housing, the locating end of a shaft.

Compatibility and replacement:

SealMaster NPL-9 is a related size with a different housing. Two-bolt pillow blocks of the same bore from other makers use different bolt centres and centre heights.

Frequently asked questions:

What shaft size does the SealMaster NP-9 fit?

A 9/16 in shaft, locked by two setscrews in the extended inner ring.

What is the bolt hole spacing of the NP-9?

3-3/4 in (95.25 mm) center to center, with 1/2 in bolts.

Is the NP-9 a pillow block or a flange unit?

A two-bolt cast iron pillow block.