NTN6207P4P4 / ABEC-7 Precision Deep Groove Ball Bearing 35x72x17 mm, Solid-Lubricant Filled, No Relubrication Required

Product Description

What this part is

A single-row deep groove ball bearing in the 6207 size — 35 mm bore, 72 mm outside diameter, 17 mm width — supplied to P4 precision. That is the point of this listing. A stock 6207 is a normal-class commodity bearing available anywhere; a P4 6207 is a precision part specified when running accuracy, not load capacity, is what governs the design.

Decoding the designation

62: deep groove ball bearing, ISO dimension series 02 (medium width, medium section).

07: bore code, 07 x 5 = 35 mm bore.

P4: ISO tolerance class 4, equivalent to ABEC-7. NTN’s precision ladder runs P0 (omitted, normal), P6, P5, P4, P2. P4 controls bore and outside-diameter tolerance, radial and axial runout, and width variation far more tightly than normal class.

Closure suffix: none present. NTN’s closure codes for this family are ZZ (metal shields), LLB / LLU (contact rubber seals) and NR (snap-ring groove).

Why P4 on a deep groove ball bearing matters:
Precision class governs runout rather than capacity: a P4 6207 carries the same kilonewtons as a normal-class 6207 and holds the shaft far more accurately. In a grinding-wheel head, a printing-press cylinder, an instrument spindle or a testing machine, the bearing’s radial runout is transmitted straight into the workpiece or the measurement. Going from normal class to P4 typically cuts radial runout by a factor of three or more, and that improvement reaches the tool tip where the housing and shaft seats are machined to matching tolerances.

The solid-lubricant fill

This unit is marked as a solid-lubricant filled build. The free internal space is packed with a polymer matrix that holds oil and releases it slowly in service.

Relubrication: the bearing runs for life on its original charge, with no regreasing interval to schedule.

Speed: the polymer fill adds drag, giving a lower practical speed limit than the open-bearing figures below, which apply to the base 6207.

Contamination resistance: improved. The fill occupies the volume that dirt and washdown water would otherwise enter, which is why these builds turn up in food processing, textile machinery, conveyor ovens and wet environments.

Published ratings and mounting data

Figures below are NTN’s own published data for the base 6207 envelope, per bearing. They govern load capacity and geometry; the speed figures apply to the standard grease-lubricated open bearing and should be derated for the solid-lubricant build.

Bore d: 35 mm.

Outside diameter D: 72 mm.

Width B: 17 mm.

Rows: 1.

Dynamic Load Rating Cr: 28.4 kN (28,400 N / 6,380 lbf) per bearing.

Static Load Rating C0r: 15.3 kN (15,300 N / 3,430 lbf) per bearing.

Limiting Speed: 9,800 rpm on grease and 11,000 rpm on oil, base bearing.

Mass: 0.288 kg (0.635 lb) per bearing.

Fillet radius r min: 1.0 mm. Second fillet radius r1 min: 0.5 mm.

Shaft abutment diameter da min: 41.5 mm. Housing abutment diameter Da max: 65.5 mm. Maximum shaft and housing fillet radius ras max: 1.0 mm.

Precision class: P4 (ISO class 4 / ABEC-7).

Internal clearance: CN (normal); no clearance suffix on the designation.

Cage: pressed steel on the standard build. Bearing material: high-carbon chrome bearing steel.

Operating temperature range, base bearing: −40 °C to +120 °C.

Quantity and configuration

Unit Quantity: 1 Pc. Priced and sold as one bearing.

Interchange guidance

The ISO base number 6207 crosses cleanly across every major brand, and the precision class is specified explicitly alongside it. SKF 6207/P4, FAG 6207-P4, NSK 6207P4, Koyo 6207P4, Timken 6207-P4. A plain 6207 from any brand is normal class and is a different part.

On the MM-207-K marking

This part has been listed with the additional designation MM-207-K. It is retained as a cross-reference because it is a real marking. The MM prefix belongs to the MRC / SKF precision ball-bearing series (MRC was formerly Marlin Rockwell). MRC and NTN precision nomenclature are separate schemes.