The standard’s main object is to establish the allowances of free forged steel bars intended to achieve final dimensions by machining.
It is applicable to steel bars for general purposes (base or quality) and for special steels (included tool steels).
| Profile |  | |
| Standard | UNE 36-514-84 | |
| Dimension, mm. | Tolerance, mm. | |
| > 250 | ≤ 300 | ±6 |
| > 300 | ≤ 315 | ±6,5 |
| > 315 | ≤ 400 | ±7,7 |
| > 400 | ≤ 500 | ±9,2 |
| > 500 | ≤ 630 | ±11,0 |
| > 630 | ≤ 800 | ±13,5 |
| > 800 | ≤ 1000 | ±16,3 |
| Profile |  | |
| Standard | UNE 36-514-84 | |
| Dimensión, mm. | Tolerance, mm. | |
| > 120 | ≤ 150 | ±1,8 |
| > 150 | ≤ 160 | ±4,2 |
| > 160 | ≤ 200 | ±4,9 |
| > 200 | ≤ 250 | ±5,8 |
| > 250 | ≤ 315 | ±6,5 |
| > 315 | ≤ 400 | ±7,7 |
| > 400 | ≤ 500 | ±9,2 |
| > 500 | ≤ 630 | ±11,0 |
| > 630 | ≤ 800 | ±13,5 |
| > 800 | ≤ 1000 | ±16,3 |