What this part is:

NTN UCFU-3/4MFG1 is a complete housed ball bearing unit in the four-bolt square flange style, from NTN's Ultra-Class line. The one-piece cast iron housing has a black oxide finish and four mounting bolt holes at the corners of a square pattern. Bore: 3/4 in (19.050 mm). Locking: two setscrews in the extended inner ring. Sealed for life, non-relubricatable, no grease fitting. Unit Quantity: 1 Pc. GTIN: 4547359864229.

Decoding the designation:

UC — wide inner ring insert bearing, setscrew locking, spherical outer surface for self-alignment.

FU — four-bolt square flange housing in the Ultra-Class sealed-for-life construction.

3/4 — inch bore, 0.750 in.

A-UC204-012D1/LP09M — insert bearing number. FU204V65 — housing number. The 204 size code carries a 3/4 in bore in the inch range, coded 012 as twelve-sixteenths.

Specifications:

Bore Diameter: 0.750 in (19.050 mm). Housing Style: Four-bolt square flange unit. Housing Material: Cast iron, black oxide finish. Locking Device: Setscrew, two in the extended inner ring. Closure Type: Contact nitrile seals both faces. Relubrication: Sealed for life. Lubricant: Factory grease charge, sealed for life. Rolling Elements: Ball. Number Of Rows: 1. Number Of Bolt Holes: 4. Dynamic Load Rating: 14.20 kN / 3192 lbf. Static Load Rating: 6.65 kN / 1495 lbf. Limiting Speed: 6660 RPM. Item Weight: 0.820 kg / 1.799 lb. Operating Temperature: -40 to 120 °C / -40 to 250 °F. Replacement Insert: A-UC204-012D1/LP09M.

Dimensions and mounting:

Bolt centre-to-centre (J): 2.5000 in (63.5 mm) on each side of the square. Bolt hole diameter (N): 0.4219 in (10.7 mm). Flange square across the flats (L): 3.3750 in (85.7 mm). Total housing width (A): 1.1563 in (29.4 mm). Housing overall depth (A0): 1.4688 in (37.3 mm). Flange thickness (A2): 0.7500 in (19.1 mm). Insert bearing width (B): 1.2205 in (31.0 mm). Inner ring extension (S): 0.5000 in (12.700 mm).

Compatibility and replacement:

Four-bolt square flange units with setscrew locking, 3/4 in bore, 204 housing envelope and 2.5000 in bolt pattern, relubricatable through a grease fitting: NTN UCF204-012D1, AMI UCF204-12, FYH UCF204-12, Koyo UCF204-12, Asahi UCF204-012. SKF FY 3/4 TF is a four-bolt square flange unit in 3/4 in bore. The two-bolt NTN UCFL204-012 and the four-bolt round NTN UCFC204-012 use the same insert with a different housing and bolt pattern. MPN Variants: UCFU-3/4MFG1, UCFU-3/4 MFG1, UCFU3/4MFG1, UCFU 3/4 MFG1, UCFU-3/4, UCFU-.75, FU204V65, A-UC204-012D1, 35JF40.

Frequently asked questions:

What is the bolt pattern of the NTN UCFU-3/4MFG1?

Four bolts in a square pattern, 2.5000 in (63.5 mm) centre-to-centre, bolt hole diameter 0.4219 in (10.7 mm).

How is the NTN UCFU-3/4MFG1 locked to the shaft?

Two setscrews in the extended inner ring, for a 3/4 in (19.050 mm) shaft.

Can the NTN UCFU-3/4MFG1 be relubricated?

No. It is sealed for life with a factory grease charge and has no grease fitting.