Brand: NSK

NSK UCP208D1 Pillow Block Ball Bearing Unit

Name: NSK UCP208D1 Pillow Block Bearing Unit – Catalog & Quote
Brand: NSK
SKU: UCP208D1

Description

A cast iron pillow block ball bearing unit for conveyors, fans and shafting

The NSK UCP208D1 is a pillow block ball bearing unit for a 40 mm shaft: a UC208D1 insert bearing with a spherical outer ring sitting in a P208D1 cast housing, so the unit is self-aligning. The bearing has an extended inner ring that is fastened to the shaft by set screws, and NSK states that its ball-end set screw design is a feature meant to prevent loosening. The D1 suffix marks the relubricatable version, with a grease fitting for regrease in service; units without the suffix are the maintenance-free type. Pillow block units are used wherever a shaft runs on bolted-down supports: belt and screw conveyors, fans and blowers, agitators, line shafts and agricultural and food processing machinery.

Technical specifications

Parameter	Specification
Designation	UCP208D1: UCP = pillow block unit with cast housing, set screw type; 208 = 40 mm shaft; D1 = relubricatable type with grease fitting
Shaft diameter	40 mm
Bearing in the unit	UC208D1: d 40 mm, D 80 mm, inner ring width B 49.2 mm, C 21 mm
Housing	P208D1 cast housing, spherical seat so the unit is self-aligning
Basic dynamic / static load rating (bearing)	29,100 N / 17,800 N
Housing dimensions	H 49.2 mm; L 184 mm; J 137 mm; A 54 mm; N 17 mm
Mounting bolts	M14
Mass of unit	1.9 kg; 2.1 kg with pressed steel dust cover (Z or ZM); 2.7 kg with cast dust cover (C or CM)
Shaft locking	Two set screws on the extended inner ring; ball-end set screw design
Maintenance	Relubricatable; the maintenance-free version is ordered without the D1 suffix

Size table for the NSK UCP2 D1 pillow block units

Dimensions and masses are from the UCP2 dimension table of the NSK ball bearing units catalogue; load ratings are those of the matching UC2 insert bearing.

Unit	Shaft d mm	H mm	L mm	J mm	A mm	N mm	Bolt	Unit mass kg	Bearing Cr N	Bearing C0r N
UCP205D1	25	36.5	140	105	38	13	M10	0.8	14,000	7,850
UCP206D1	30	42.9	165	121	48	17	M14	1.4	19,500	11,300
UCP207D1	35	47.6	167	127	48	17	M14	1.6	25,700	15,300
UCP208D1	40	49.2	184	137	54	17	M14	1.9	29,100	17,800
UCP209D1	45	54	190	146	54	17	M14	2.2	32,500	20,400
UCP210D1	50	57.2	206	159	60	20	M16	2.7	35,000	23,200
UCP211D1	55	63.5	219	171	60	20	M16	3.5	43,500	29,200
UCP212D1	60	69.8	241	184	70	20	M16	4.7	52,500	36,000

Housing options, fitting and selection

Besides the plain housing, NSK lists the unit with a pressed steel dust cover (open end Z, closed end ZM) and with a cast dust cover (open end C, closed end CM), at higher unit mass as shown in the specification table. The same UC bearing is also fitted in flanged housings (UCF, UCFL, UCFC), take-up units and cartridge units, so the shaft size, load direction and mounting surface decide the housing type. Check that the bolt holes and the centre height H match the supports, and tighten the set screws to the torque in the NSK technical section.

NSK also lists eccentric locking collar and adapter type units for other ways of fixing the bearing to the shaft, so confirm the shaft fixing method before ordering. For sealed deep groove bearings see the SKF 6206-2RS1, and for related products browse Electric Motors, Pumps and Turbines.

Documents and ordering

State the full unit number including the D1 suffix, the housing cover option, the shaft diameter and the quantity. The attached PDF is a page extract from the NSK catalogue Ball Bearing Units (Cat. No. E1154f) with the technical notes, the UCP2 dimension table and the UC2 bearing table. Seven Star LLC is an independent supplier in Muscat; availability and lead time are confirmed per enquiry.

Datasheets & Documents

Catalog NSK Ball Bearing Units E1154f - extract: technical notes, UCP2 pillow block and UC2 bearing tables Download

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About brand

NSK is a Japanese manufacturer of bearings and motion and control components and the largest bearing maker in Japan. The company was founded in Tokyo in 1916, when it also produced its first bearings, and it was the first company to make ball bearings in Japan. NSK Ltd. is headquartered in Shinagawa, Tokyo, and listed on the Tokyo Stock Exchange.

Seven Star LLC is an independent supplier in Muscat. We list NSK catalogue bearings for maintenance teams, workshops and machine builders in Oman and the GCC.

NSK company profile

Founded	1916, Yurakucho, Tokyo, Japan (predecessor partnership 1914)
Headquarters	Ōsaki, Shinagawa, Tokyo, Japan
Ownership	Public company, Tokyo Stock Exchange
Distinction	First manufacturer of ball bearings in Japan
Product families	Deep groove and angular contact ball bearings, cylindrical, tapered and spherical roller bearings, super-precision machine tool bearings, linear guides and ball screws, automotive components

Milestones

1914: The predecessor partnership is set up in Tokyo.
1916: NSK is founded and produces its first bearings.

NSK product series

Ball bearings on this site include the 608 extra small and 6208DDU deep groove bearings, the 7208A single-row and 5206 double-row angular contact bearings, the 7304AWDT matched pair, the QJ210 four-point-contact bearing, the BL210 maximum-type bearing, the 51208 single-direction and 52208 double-direction thrust ball bearings and the 30TAC62C ball screw support bearing. Roller bearings include the HR30210J tapered roller bearing and the NU210EW cylindrical roller bearing.

Super precision bearings include the 70BNR10H NSKROBUST angular contact bearing and the N1010MRKR cylindrical roller bearing for machine tool spindles, and the UCP208D1 pillow block unit covers housed bearings.

Where NSK bearings are used

Electric motors, pumps, fans and gearboxes, conveyors, machine tool spindles and ball screw drives, and general industrial machinery. Each product page quotes dimensions, load ratings and limiting speeds as printed in the NSK catalogue.

NSK products we list

Family	Examples
Ball Bearings	51208 Thrust Ball Bearing, 5206 Double-Row Angular Contact Ball Bea…, 608 Extra Small Deep Groove Ball Bearing, 6208DDU Deep Groove Ball Bearing, 70BNR10H NSKROBUST Super Precision Angul…, 7208A Single-Row Angular Contact Ball Be…, 7304AWDT Matched Angular Contact Ball Be…, BL210 Maximum Ball Bearing
Roller Bearings	HR30210J Tapered Roller Bearing

Ordering NSK bearings: what we need

Give the complete designation marked on the bearing, including prefix and suffix letters such as seal, cage, clearance and precision codes. If the marking is worn, measure bore, outside diameter and width and tell us the machine and shaft position, the operating speed and the lubrication. State the quantity and any precision class or special clearance required.

Facts checked against NSK's own company history (nsk.com), October 2026.

Browse NSK products by category: Ball Bearings.

FAQ

Questions about the NSK UCP208D1 Pillow Block Ball Bearing Unit

Answers from our engineering team on installation, compatibility and integration.

01What does UCP mean in UCP208D1?

UCP is the NSK unit type for a pillow block unit with a cast housing and set screw type insert bearing. 208 means a 40 mm shaft.

02What does the D1 suffix mean?

NSK states that numbers with D1 indicate the relubricatable type. For the maintenance-free type, order without the D1 suffix.

03What are the load ratings of the bearing?

The UC208D1 insert bearing is listed at Cr 29,100 N and C0r 17,800 N.

04How heavy is the unit?

The catalogue gives 1.9 kg for the UCP208D1, 2.1 kg with a pressed steel dust cover and 2.7 kg with a cast dust cover.

05Is the unit self-aligning?

Yes. NSK describes the unit as self-aligning because the outer surface of the bearing and the inner surface of the housing are spherical.