SealMasterCRTBC-PN20TTapped-Base Pillow Block Bearing Unit – 1-1/4 in Shaft, Composite Housing, Concentric Collar, IP69K

Product Description

What this part is

SealMaster CRTBC-PN20T mounted ball bearing unit from the PN Gold washdown line. Bearing type: Mounted ball bearing, tapped-base pillow block. Bore / Shaft Size: 1-1/4 in, straight bore. Housing Style: Tapped-base pillow block, two bolt. Material: High-strength composite housing with stainless steel bolt ferrules; 52100 bearing steel insert with a phosphorus-nickel coating. Locking Method: SKWEZLOC concentric clamping collar. Closure Type: Triple-lip contact seal with flinger. Relubrication: Yes, 1/4-28 grease fitting.

Decoding the designation

CR — corrosion-resistant construction. The insert races and balls carry a phosphorus-nickel plating and the housing is a moulded composite, so the unit survives caustic and chlorinated washdown that would pit a plain cast iron block.

TB — tapped base. The base carries 1/2-13 threaded holes 0.75 in deep, so the unit bolts straight to a frame from below with no nuts behind the mounting face.

C — composite housing, one-piece moulded with reinforced stainless steel bolt ferrules around the mounting holes.

PN — PN Gold product line, phosphorus-nickel coated insert, IP69K rated for high-pressure high-temperature washdown.

20 — bore code in sixteenths of an inch: 20/16 = 1-1/4 in shaft.

T — SKWEZLOC concentric clamping collar with a triple-lip contact seal. The collar squeezes concentrically around the shaft, so the insert runs true rather than being pushed off centre.

Housing style and bolt pattern

Housing Style: Tapped-base pillow block, two bolt, composite, one-piece solid base. Bolt Center To Center Length: 3-1/4 in (3.25 in). Base to shaft centre height: 1-7/8 in (1.875 in). Base length: 4-1/4 in. Base width: 1.88 in. Overall height: 3-3/4 in. Overall length: 4.41 in. Mounting thread size: 1/2-13, thread depth 0.75 in. The shaft runs parallel to the mounting surface.

What these specs mean in practice

Bore / Shaft Size: 1-1/4 in. Dynamic Load Rating: 5,782 lb. Static Load Rating: 3,493 lb. Limiting Speed: 2,000 rpm. Cage Material: PPS (polyphenylene sulfide). Cage Type: Land-riding retainer. Rolling Elements: Balls. Expansion Type: Fixed. Misalignment capability: ±2.0°, static setting. Length through bore: 1.688 in. Inner ring outside diameter: 1.862 in. Centreline to outermost bearing face: 1 in.

A concentric clamping collar grips the shaft evenly around its whole circumference, which keeps the insert concentric and cuts the vibration a setscrew mounting can introduce, and it holds against reversing rotation. The triple-lip contact seal plus flinger is what earns the IP69K rating: it resists high-pressure, high-temperature washdown spray directly at the seal face. The composite housing removes the corrosion path entirely, and the stainless ferrules keep bolt-hole strength at cast-iron levels.

Lubricant: calcium sulfonate NLGI 2, NSF H1 food grade. Certification: IP69K.

Quantity and configuration

Unit Quantity: 1 Pc. One complete tapped-base pillow block, housing, insert, end cap and clamping collar assembled, per unit.

Mounting data

Bolt Center To Center Length: 3-1/4 in. Base to centre height: 1-7/8 in. Base length: 4-1/4 in. Base width: 1.88 in. Overall width: 1.88 in. Mounting thread: 1/2-13 x 0.75 in deep. Grease fitting thread: 1/4-28. Insert Series: PN-20.

Interchange guidance

MPN Variants: CRTBC-PN20T, CRTBCPN20T, CRTBC PN20T. The CRTBC-PN20 shares this housing and the same 1-1/4 in shaft size on a setscrew-locking insert, so the two are the same footprint on different locking methods. The 205T, 206T and other metric-coded members of the CRTBC-PN family use the same tapped-base composite housing family at their own shaft sizes.