SNR7006HG1DUJ84Angular Contact Ball Bearing – 30 mm ID, 55 mm OD, 13 mm Width, Open, 25°, Medium Preload, ABEC 7, Matched Pair

Product Description

What this part is

SNR 7006HG1DUJ84 super-precision angular contact ball bearing, supplied as a universally matchable duplex pair. Brand: SNR (NTN-SNR). Part Number: 7006HG1DUJ84. Bearing Type: Angular Contact Ball Bearing. Series: 70. Base Number: 7006. Bore: 30 mm. Outside Diameter: 55 mm. Overall Width: 13 mm. Bore Type: Straight. Number Of Rows: 1 per bearing. Rolling Elements: steel balls. Bearing Material: 52100 vacuum-degassed steel rings and balls. Closure Type: Open. Design Units: Metric. Country of Origin: France. Item weight: 0.53 lb. Searchable forms of the number: 7006 H G1 DU J84, 7006-H-G1-DU-J84, 7006HG1DU J84.

Decoding the designation

Contact Angle: 25°. Cage Material: laminated phenolic resin. Cage Type: machined, centred on the outer ring. Preload: Medium, 90 lbf. Precision Class: ISO Class 4, equivalent to ABEC 7 and DIN P4. Internal Clearance: N/A, because the pair is set to a defined preload rather than to a running clearance. Mounting Arrangement: Universal — the rings are flush ground, so the pair can be set back-to-back, face-to-face or in tandem. In the SNR key H is the 25° angle, DU is a pair of universal bearings, and in J84 the 8 is the medium preload grade while the 4 is precision class ISO 4.

Load ratings and speed

Dynamic Load Rating: 15.93 kN (3,580 lbf) per bearing. Static Load Rating: 11.21 kN (2,520 lbf) per bearing. Limiting Speed: 22,000 rpm on grease and 34,000 rpm on oil, both figures for a single bearing. Lubricant: grease or oil. Speed changes when bearings are matched into an arrangement: a back-to-back pair at medium preload runs at 0.70 of the single-bearing figure, giving 15,400 rpm on grease and 23,800 rpm on oil, and a face-to-face pair at medium preload runs at 0.65, giving 14,300 rpm on grease and 22,100 rpm on oil.

What these specs mean in practice

A 25° contact angle carries more thrust and less speed than a 15° execution, which suits spindles and screw drives where axial load dominates. On this same 30 x 55 x 13 mm envelope the 15° build is rated 3,760 lbf dynamic and turns 25,000 rpm on grease, against this bearing’s 3,580 lbf and 22,000 rpm. Medium preload holds the balls in defined contact at all times, giving higher axial and radial stiffness and tighter shaft location than a light-preload set, without the thermal penalty of the heavy grade. The laminated phenolic cage is light and quiet and tolerates marginal lubrication; centring it on the outer ring keeps it stable at speed. Rings and balls are 52100 vacuum-degassed steel, a high-carbon chrome bearing steel. ISO Class 4 tolerance gives closer runout and lower running vibration than Class 5, and most SNR ISO 4 bearings achieve ISO 2 run-out accuracy.

Quantity and configuration

Unit Quantity: 2 Pcs. This is a universally ground pair with the preload built in at the factory. Universal grinding leaves the inner and outer ring faces flush once preloaded, so the pair comes up to its intended medium preload in any of the three orientations with no ground spacers.

Interchange guidance

Cross-references carried on the carton: SKF 7006 ACD/P4ADGB, FAG B7006-E-T-P4S-DUM, RHP 7006A5TRDUMP4, Fafnir 3MM9106WICRDUM. Each is a 25°, medium-preload, universally matchable pair on the same 30 x 55 x 13 mm envelope: SKF AC and FAG B70-series E are both the 25° code, RHP A5 is the 25° code with TR the phenolic cage, and Fafnir 3MM is 25°. SKF DGB, FAG DUM and RHP DUM are all the medium preload grade. Harmonization Code: 8482.10.50.28.