NAP / NAPK Series cast pillow block units for applications where an existing pillow-block envelope must be retained while the locking arrangement follows the NAP or NAPK designation. Catalog evidence covers the nap eccentric collar; napk cataloged as a separate locking variant and two-bolt base mounting; confirm the exact size row and operating conditions before ordering.
The catalog positions this family for applications where the designer needs an existing pillow-block envelope must be retained while the locking arrangement follows the NAP or NAPK designation. In the supplied catalog, NAP / NAPK Series is shown as cast pillow block units with nap eccentric collar; napk cataloged as a separate locking variant and two-bolt base mounting. For NAP / NAPK Series, quotation work moves faster when the source designation, shaft or bore dimension and the controlling mounting measurements are checked before optional seal, grease or housing requests are discussed.
A mounted-bearing choice has to solve two separate problems: shaft connection and structural attachment. With NAP / NAPK Series, matching the bore without checking two-bolt base mounting can produce a part that fits the shaft but not the machine.
The catalog view shows how the rolling bearing portion is packaged into the selected support form. For NAP / NAPK Series, that chain includes nap eccentric collar; napk cataloged as a separate locking variant at the shaft and two-bolt base mounting at the machine. Do not use any compliance around NAP / NAPK Series to hide poor base flatness, frame twist or a shaft that is already out of line.
The catalog form is relevant to conveyors, process equipment, farm machinery and general rotating equipment with base-mounted bearing supports. Application photos of NAP / NAPK Series are useful when they show neighboring shoulders, guards and mounting faces, not only the old bearing itself.
NAP and NAPK pillow blocks deserve a full-code check because the locking arrangement is part of the unit identity. A base-mounted housing may look familiar while the shaft connection differs from a nearby UCP installation. Record the collar or other locking hardware, shaft diameter, base footprint and center height before choosing a replacement. This avoids ordering a unit that bolts to the frame but cannot be secured to the shaft in the intended way.
On an older conveyor or process machine, check whether operators have changed the locking hardware during previous repairs. Nonstandard screws, missing collars or improvised spacers can hide the original configuration. Send those observations with the machine photos and let the catalog designation drive the replacement decision. The objective is a clean mechanical match, not the preservation of an old maintenance workaround.
For NAP or NAPK, compare the locking hardware on both sides of the machine if paired supports are used. Field repairs sometimes mix collar and screw arrangements between stations. A side-by-side record of the two unit codes, shaft sizes and base dimensions can reveal that mismatch immediately. Correct identification before ordering is cheaper than trying to make a mixed pair behave like a matched bearing support system.
For paired NAP supports, mark left and right units before they are removed. Collar orientation, base position and shaft direction can be lost once both assemblies reach the bench. Keeping the locations separate makes comparison with the catalog much clearer and helps determine whether a previous repair mixed variants across one shaft line.
| Parameter | Specification / Selection Note |
|---|---|
| Product form | Cast pillow block units |
| Catalog series | NAP / NAPK Series |
| Shaft locking | NAP eccentric collar; NAPK cataloged as a separate locking variant |
| Machine mounting | Two-bolt base mounting |
| Material confirmation | Confirm the exact material grade for NAP / NAPK Series on the quotation or current drawing; this page does not infer grade from appearance |
| Seal / lubrication review | Check the selected NAP / NAPK Series designation together with speed, contamination and cleaning conditions |
| Technical source | Supplied bearing catalog, PDF page 16 |
For NAP / NAPK Series, the transcribed values below are limited to dimensions that could be read confidently from the supplied catalog. Confirm the full NAP / NAPK Series row against the accompanying specification image before a production order.
| Catalog Series | Shaft Lock / Interface | Unit Form | Mounting Geometry | Source |
|---|---|---|---|---|
| NAP | Eccentric locking collar | Cast pillow block | Two-bolt base | PDF pages 15–16 |
| NAPK | Separate catalog locking variant | Cast pillow block | Two-bolt base | PDF page 16 |
Replacement accuracy improves when every controlling interface is measured before the old unit is discarded. A NAP / NAPK Series replacement needs the actual shaft measurement, the controlling two-bolt base mounting dimensions and confirmation of nap eccentric collar; napk cataloged as a separate locking variant. For NAP / NAPK Series, a readable old designation helps, but dimensions and duty data remain the stronger safeguard against an incorrect interchange.
Identify the complete unit number before ordering, check base and center-height dimensions against the machine, and assemble the shaft lock in the direction and sequence required by the selected variant. The main installation hazard for NAP / NAPK Series is that NAP and NAPK should not be treated as interchangeable labels; the locking hardware and matching insert designation need to follow the catalog. A final hand-rotation check on NAP / NAPK Series, when permitted by the safety procedure, can reveal interference that a dimensional inspection misses.
Include the locking hardware in routine inspection rather than focusing only on grease; collar or screw movement often shows up before bearing noise becomes obvious. A useful inspection record for NAP / NAPK Series includes temperature, contamination tracks, grease behavior and any movement of the locking components.
For NAP / NAPK Series, combine model identification with measured geometry instead of relying on an image search or a shortened part number. Do not hide NAP / NAPK Series environmental details behind the industry name. Describe dust, water exposure, cleaning agents and temperature at this NAP / NAPK Series bearing position. Ever Power Netherlands Branch can then review options for NAP / NAPK Series against the supplied application instead of presenting unverified material, seal or grease claims as standard catalog facts.
Cataloged references covered here are NAP eccentric locking collar type; NAPK separate catalog variant. For NAP / NAPK Series, retain the exact suffix, bore form and related housing reference from the source when the goal is a drop-in replacement.
The first replacement check for NAP / NAPK Series is physical fit. Measure the shaft or bore and the controlling two-bolt base mounting dimensions, then confirm the nap eccentric collar; napk cataloged as a separate locking variant and full catalog code. Photos help identify the family but do not prove interchange.
Changing the NAP / NAPK Series locking concept may require different shaft preparation or additional axial clearance. Treat a locking change on NAP / NAPK Series as a reviewed redesign and verify the complete dimensions before ordering.
Specify environment and duty rather than assuming one lubrication rule for every NAP / NAPK Series unit. For NAP / NAPK Series, speed, hours, contamination level, washdown and temperature are the inputs needed for a meaningful review.
Include model identification, shaft size, two-bolt base mounting dimensions, speed, duty direction, quantity and installation photographs for NAP / NAPK Series. If the old NAP / NAPK Series part is unreadable, a measured sketch is more useful than an assumed cross-reference.
Technical evidence for NAP / NAPK Series comes from the supplied scanned catalog, including its series drawing and model table. The gallery drawing for NAP / NAPK Series is a direct catalog crop, not an AI-generated technical illustration. Any application visualization added later for NAP / NAPK Series should be treated as illustrative rather than as dimensional evidence.
Evidence chain for NAP / NAPK Series: the user catalog on PDF page 16 supports product geometry and dimensions, while the project Word file provides page organization. Drive and web sources are supplementary context only.
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