KAYDONK07008CT0Open Thin-Section Radial Contact Ball Bearing 70 x 86 x 8 mm, Square 8 x 8 mm Section, ABEC 1F, 1 Pc

Product Description

What this part is

A Kaydon Reali-Slim thin-section ball bearing, 70 mm bore by 86 mm outside diameter by 8 mm wide, with no seals or shields. The cross-section is square — 8 mm of radial wall and 8 mm of width — which is the defining feature of the thin-section family. It is a radial contact bearing, the Conrad-assembly deep groove type, so it carries radial load plus thrust in either direction and a modest moment load.

Decoding the designation

Read against Kaydon’s Reali-Slim part-numbering system

K – AISI 52100 bearing steel races and balls, with NO seals and NO shields (open)070 – 70 mm bore08 – 8 mm square cross-sectionC – bearing type: radial contact (Conrad deep groove), not angular contact and not four-pointT – separator: stainless steel formed-ring, snap-over type0 – Kaydon Precision Class 1, per ABEC 1F, with the standard default clearance for the size
The suffix -10111 seen on the carton for this item is a Kaydon build reference and is carried here as a search term.

Correcting the source data

Earlier copy for this listing described the bearing as angular contact. It is not: in Kaydon’s scheme the type letter C is radial contact, while A, B, F, T and U are the angular contact variants and X is four-point. The distinction matters — a radial contact bearing takes thrust equally in both directions and needs no duplexing or preload setting, whereas an angular contact bearing of the same envelope is directional and normally used in pairs.

What these specs mean in practice

A thin section buys space, weight and a large through-bore. An 8 mm wall carrying a 70 mm shaft lets a hollow shaft, a wiring loom, an optical path or a slip ring pass straight through the middle of a rotating joint, in a housing that could never accept a standard-series bearing. It also cuts rotating mass and inertia. What it costs is load capacity and stiffness: there is far less material and a smaller ball complement than a standard 6014, so these bearings are chosen for accurate, low-friction guidance under moderate load — robot and gimbal joints, rotary tables and indexers, medical imaging, semiconductor handling, optical mounts and camera platforms.

Being open, the bearing arrives without service grease. It needs lubricating on assembly and protecting by the housing. The equivalent sealed build (Kaydon material code J, two nitrile seals) or shielded build (E, two shields) is a different part number and arrives pre-greased.

Published specifications

Bore: 70 mmOutside diameter: 86 mmWidth: 8 mmCross-section: 8 x 8 mm, squareBearing type: radial contact (Conrad deep groove), single rowClosure: open — no seals, no shieldsSeparator: stainless steel formed ring, snap-overPrecision: Kaydon Class 1, ABEC 1FInternal fit: standard default clearance for the sizeRace and ball material: AISI 52100 bearing steel

Quantity and configuration

Sold as 1 piece, one open bearing. Not a duplex pair, no seals, no shields, no housing or mounting ring.

Fitting notes

Thin-section rings are only as round as what you mount them in — an 8 mm wall takes the shape of a bad housing bore, and a bearing that measures perfectly on the bench can run rough once clamped. Machine the shaft and housing to the flatness and roundness Kaydon specifies for thin-section work, support the rings across their full face, and clamp evenly with a full-face flange rather than a few screws. Press only on the ring being fitted and never across the balls. Lubricate on assembly — the bearing is supplied dry.

Interchange guidance

The direct equivalents are other thin-section radial-contact bearings in the same 70 mm bore, 8 mm square section: Kaydon KA and KC series equivalents, RBC/Thin Section Bearings and Silverthin metric equivalents of matching type and closure. Beware the same-envelope traps — a K07008XP0 is four-point contact, a K07008A is angular contact, and a J07008CT0 is the sealed build. All three share the outside dimensions and none of them is a drop-in substitute for a radial-contact open bearing.