HMI Panels and PLC Modules: What They Do and How to Match a Replacement
When an HMI panel goes dark or a PLC module stops communicating, the machine it
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Inch tapered roller bearing cone, 3.0000 in bore, 1.0000 in width, Class 3 precision, 111,000 N dynamic rating. Mates with a 27620 cup.
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$152.05 Original price was: $152.05.$114.04Current price is: $114.04.

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| MFR / Brand | Timken |
|---|---|
| MPN | 27684A-3 |
| Model | 27684 A 3 |
| Bearing Type | Tapered Roller Bearing Cone |
| ID | 3.0000 in (76.2 mm) |
| Condition | New – Open box |
|---|---|
| Series | 27600 |
| Base Number | 27684A |
| Condition Note | Made In USA, New Old Stock, Class 3 Precision |
| Overall Width | 1.0000 in (25.400 mm) |
| Mpn Variants | 27684A-3; 27684-A *3; 27684A #3; 27684A3; 27684-A-3 |
| Compatible With Replaces | Mating cups: Timken 27620, Timken 27620RB |
| Precision Class | Class 3 |
| Additional Attributes | K Factor 1.40; C90 28,700 N; Ca90 20,400 N; Effective Load Centre 0.5 mm; Max shaft fillet radius 0.8 mm; da 84 mm; db 85 mm; Aa 1.3 mm; Ab 2.3 mm; G1 98.2; G2 41.8; Cg 0.120 |
| Dynamic Load Rating | 111,000 N |
| Static Load Rating | 178,000 N |
| Rolling Elements | Tapered Roller |
| Item Weight | 3.349 kg (7.38 lb) |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Harmonization Code | 8482.2 |
| Part Number | 27684A-3 |
| Cone Part Number | 27684A |
| Cone Width | 1.0000 in |
| Cone Backface To Clear Radius | 0.03 in |
| Cone Frontface Backing Diameter | 3.31 in |
| Cage Cone Frontface Clearance | 0.09 in |
| Cage Cone Backface Clearance | 0.05 in |
| Effective Center Location | 0.02 in |
| Cross Reference 1 | Koyo 27684A |
|---|---|
| Cross Reference 2 | NTN 4T-27684A |
| Cross Reference 3 | NSK 27684A |
| Cross Reference 4 | SKF 27684A |
| Cross Reference 5 | BCA / Bower 27684A |
Timken 27684A-3 inch tapered roller bearing cone. Bearing Type: Tapered roller bearing cone — the inner ring carrying the tapered rollers and cage as one assembly. Series: 276. Base Number: 27684A. Bore Diameter: 3.0000 in (76.2 mm). Overall Width: 1.0000 in (25.400 mm). Bore Type: Straight. Rolling Elements: Tapered Roller. Number Of Rows: 1. Item Weight: 3.349 kg (7.38 lb).
27684A — Timken base cone number in the 276 inch series, 3.0000 in bore.
*3 — Timken Precision Class 3. Tighter running and mounting tolerance than standard class, giving lower running vibration and closer shaft location. The same class is written 27684A-3, 27684A *3 and 27684A #3.
Dynamic Load Rating: 111,000 N (C1, one million revolutions). Static Load Rating: 178,000 N. Dynamic radial rating at 90 million revolutions (C90): 28,700 N. Dynamic axial rating at 90 million revolutions (Ca90): 20,400 N. K Factor: 1.40. A K of 1.40 is a steep roller angle, so this cone carries a large thrust share relative to its radial rating.
Effective Load Centre: 0.5 mm. Maximum fillet radius on the mating shaft: 0.8 mm (0.030 in). Shaft Backing Shoulder Diameter, frontface (da): 84 mm (3.31 in). Shaft Backing Shoulder Diameter, backface (db): 85 mm (3.35 in). Cage location relative to backface (Aa): 1.3 mm. Cage location relative to frontface (Ab): 2.3 mm. G1 Factor: 98.2. G2 Factor: 41.8. Geometry Factor (Cg): 0.120.
Unit Quantity: 1 Pc. Cone only. Matching cups are the Timken 27620 and 27620RB.
27684A is an industry-standard inch tapered roller bearing cone number. Koyo, NTN, NSK, SKF and BCA/Bower all build a 27684A to the same boundary dimensions, and all interchange with this cone. Precision Class 3 is a Timken tolerance grade; a standard-class 27684A from any maker fits the same envelope but holds a wider tolerance band.
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