Timing Belt Pulleys and V-Belt Sheaves: Matching Belt Drive Components Correctly
Belt drives may appear simple, consisting of two wheels and a belt for power transfer.
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Super-precision angular contact ball bearing, 20 x 42 x 12 mm, 25° contact angle, phenolic cage, ABEC 7, medium preload, universally matchable pair.
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Here are some other options that might fit your project — cross-referenced equivalents and similar parts we have in stock and ready to ship. Need help choosing? Call 585-295-7880.
Super-Precision Angular Contact Ball Bearing - 20 mm ID, 42 mm OD, 12 mm Width, 25° Contact Angle, Phenolic Cage, ISO Class 4, Medium Preload$59.89
Super Precision Angular Contact Spindle Bearing Matched Pair 20 x 42 x 12 mm 25 Degree Contact Angle ABEC 7 P4 Universally Ground Phenolic Cage$119.90
Angular Contact Ball Bearing - Straight Bore, 20 mm ID, 42 mm OD, 12 mm Width, Open, 15° Contact Angle, Light Preload.$117.94
Super-Precision Angular Contact Ball Bearing - 20 mm ID, 42 mm OD, 12 mm Width, Open, 25° Contact Angle, Light Preload, ABEC 7$54.38| MFR / Brand | SNR |
|---|---|
| MPN | 7004HG1DUJ84 |
| Model | 7004A5/ACD 7004E T DUM P4 / 3MM9104WI CR DUM / 7004 H G1 DU J84 |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 20 mm |
| OD | 42 mm |
| Width | 12 mm |
| Material | Chrome Steel |
|---|---|
| Series | 7000 |
| Lubricant | Oil |
| Preload | Medium Preload |
| Base Number | 7004 |
| Overall Width | 12 mm |
| Bore Shaft Size | 20 mm |
| Mpn Variants | 7004HG1DUJ84 / 7004-H-G1-DU-J84 / 7004 H G1 DU J84 / 7004A5/ACD |
| Rolling Elements | Ball |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50 |
| Part Number | 7004HG1DUJ84 |
NTN-SNR 7004HG1DUJ84 super-precision angular contact ball bearing, ISO 70 dimension series, supplied as a universally matchable set of two. Bore: 20 mm. Outside Diameter: 42 mm. Overall Width: 12 mm. Contact Angle: 25°. Number Of Rows: 1. Rolling Elements: Ball. Bearing Material: Chrome steel. Closure Type: Open. Bore Type: Straight. Series: ISO 70.
7004 gives the ISO 70 dimension series and the 20 mm bore. H sets the Contact Angle: 25°. G1 gives the cage — Cage Material: Phenolic (laminated resin), Cage Type: Machined, outer-ring centred. J84 sets Preload: Medium and Precision Class: ISO Class 4 (ABEC 7 / P4). Searchable forms of the number: 7004HG1DUJ84, 7004-H-G1-DU-J84, 7004 H G1 DU J84.
A 25° contact angle carries more thrust and less speed than a 15° angle, which suits machine-tool spindles and ball-screw ends working against a steady axial load. Cage Material: Phenolic (laminated resin) runs light and quiet at high speed and takes oil-mist and oil-air lubrication. Cage Type: Machined, outer-ring centred holds the cage stable on the outer-ring land at speed. Precision Class: ISO Class 4 (ABEC 7 / P4) holds running accuracy close, giving low radial and axial runout. Preload: Medium fixes the axial stiffness of the mounted set. Internal Clearance: N/A — a preloaded set is stiffness-set rather than clearance-set.
Unit Quantity: 2 Pcs, a factory-matched pair. Mounting Arrangement: Universal (DB, DF or DT). The pair stacks back-to-back, face-to-face or in tandem and reaches the same preload in any of the three.
Carton cross-designations: SKF 7004 ACD/P4ADGB, FAG 7004E-T-DUM-P4, NSK 7004ETRDUMP4, Fafnir 3MM9104WI CR DUM, SNR 7004A5/ACD. Each carries a 25° contact angle and a universally matchable medium-preload pair on the same 20 x 42 x 12 mm envelope. A 7004C, 7004A or 7004A5 execution shares the envelope at a different contact angle and is a related size rather than a substitution.
Belt drives may appear simple, consisting of two wheels and a belt for power transfer.
Tapered, cylindrical, and spherical roller bearings all solve the same basic problem, carrying more load
If you pulled a bearing off general industrial equipment at random, there’s a good chance
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Our team can locate, cross-reference, and source all parts.
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