Idlers for Flat Belts-Straight Type/Crosspiece Groove Straight Type/Crowned Type/Width L25-100
:
MISUMI
- [Specification Change] Internal bearing material will be changed to SUJ2 equivalent starting in July 2025. Please check here for part numbers with specification changes. Products before and after the change may be mixed in the same shipment, but there are no problems with use.
- Please check the content on our website as the PDF does not contain the most up-to-date information.
· Product type: Idlers.
· Idlers type: Bearing Built-in.
· Shape of Idlers: Straight type, Crosspiece Groove Straight Type and Crowned Type.
· Shaft Type : Bearing on Each End (2-Bearing in Total)
· The product code series Straight type: ROFAN and ROFAF.
· The product code series Crosspiece Groove Straight: ROFAM.
· The product code series Crowned Type: ROFAC.
· Idlers Material: Aluminum Alloy
· Surface Treatment solution: Clear Anodize
· Outer Diameter: 15-80 mm.
· Shaft (Bore) Diameter: 5-35 mm.
· Length: 25-100 mm.
· Pulleys for Flat Belts - Flanged, Crowned, Press-Fit Urethane
Straight
ROFAN·ROFANS (No Flange) Crosspiece Groove Straight
ROFAM·ROFAMS (No Flange) Crowned
ROFAC·ROFACS (No Flange)
ROFAF·ROFAFS (Flanged) Crosspiece Groove Part [ ! ] X ≥ Y
* Bearing Accuracy: JIS B1514 Class 0
[ ! ] The bearings are filled with grease.
[ ! ] Bearings are press-fitted. Use a puller to remove them. See here for pullers
[ ! ] Unless otherwise specified, the dimension tolerance
conforms to JIS B 0405 Class m (Medium Class).
[!] Compliant with JIS B 1514 Class 0.
ROFAN·ROFANS (No Flange) Crosspiece Groove Straight
ROFAM·ROFAMS (No Flange) Crowned
ROFAC·ROFACS (No Flange)
ROFAF·ROFAFS (Flanged) Crosspiece Groove Part [ ! ] X ≥ Y
[ ! ] For Crosspiece Groove Part Dimensions, see "Pulley, Idler Relief Dimensions."
* Bearing Accuracy: JIS B1514 Class 0
[ ! ] The bearings are filled with grease.
[ ! ] Bearings are press-fitted. Use a puller to remove them. See here for pullers
[ ! ] Unless otherwise specified, the dimension tolerance
conforms to JIS B 0405 Class m (Medium Class).
Unspecified Dimension Tolerance
(Excluding d1)
[!] Compliant with JIS B
0405 m (Medium Class).
(Excluding d1)
| Dimension Range | Tolerance (mm) | |
| Over | Or Less | |
| 0.5 | 3 | ±0.1 |
| 3 | 6 | ±0.1 |
| 6 | 30 | ±0.2 |
| 30 | 120 | ±0.3 |
0405 m (Medium Class).
d Hole Tolerance
| d (mm) | I.D. Tolerance (mm) | |
| Over | Or Less | |
| 0.6 | 2.5 | 0 －0.008 |
| 2.5 | 10 | 0 －0.008 |
| 10 | 18 | 0 －0.008 |
| 18 | 30 | 0 －0.010 |
| Type | [M] Material | [S] Surface Treatment | [M] Material | |||
| Straight (No Flange) | Straight (Flanged) | Crosspiece Groove Straight | Crowned | Bearing (Track Ring / Rolling Element) | ||
| ROFAN | ROFAF | ROFAM | ROFAC | Aluminum Alloy | Clear Anodize | SUJ2 |
| ROFANS | ROFAFS | ROFAMS | ROFACS | SUS440C Equivalent | ||
| ROFMN | ROFMF | ROFMM | ROFMC | S45C | Electroless Nickel Plating | SUJ2 |
| ROFSSN | — | ROFSSM | ROFSSC | SUS304 | — | SUS440C Equivalent |
*SUJ2 equivalent materials are used in some products. Please check here for part numbers subject to specification changes.