Specifications of lifting chain Grade T for hoist
| Item No. |
Norminal Size (mm) |
Pitch (mm) |
External Width (mm) |
Working Load Limit (kgs) |
Min. Breaking Load (kgs) |
Weight (kg/m) |
| 0515 |
5 |
15 |
17 |
800 |
3200 |
0.55 |
| 0618 |
6 |
18 |
20 |
1200 |
4800 |
0.78 |
| 0824 |
8 |
24 |
26 |
2000 |
8000 |
1.40 |
| 1030 |
10 |
30 |
33 |
3200 |
12800 |
2.22 |
Definitions
to European standard EN 818-7
For the purposes of this Part of EN 818,the following
definitions apply:
1. nominal size: Nominal diameter of the round
section steel wire or bar from which the chain is made.
2. material diameter: Diameter of the material in
the chain link as measured.
3. weld diameter: Diameter at the weld as measured.
4. length dimensionally affected by welding: Length
on either side of the center of the link, affected by welding.
5. pitch: Internal length of a link as measured.
6. manufacturing proof force(MPF) of chain: Force
to which during manufacture the whole of the chain is subjected.
7. breaking force( BF): Maximum force which the chain
withstands during the course of a static tensile test to destruction.
8. working load limit (WLL) of chain: Maximum mass
which the chain hanging vertically is authorized to sustain in general
lifting service.
9. total ultimate elongation (A): Total extion at
the point of fracture of the chain expressed as a percentage of the
internal length of the test sample.
10. processing: Any treatment of the chain subsequent
to welding, for example, heat treatment, polishing or dimension calibration.
11. lot: Specified quantity from which test sample(s)
is/are selected.
12. competent person: A designated person, suitably
trained qualified by knowledge and practical experience, and with
the necessary instructions to enable the required examination to be
carried out.
Basis of grade symbols
| Grade |
Mean stress at the specified minimum
breaking force, N/mm2 |
| Fine tolerance |
Medium tolerance |
| M |
4 |
400 |
| P |
5 |
500 |
| S |
6 |
630 |
| T |
8 |
800 |
| V |
10 |
1000 |
NOTE:
- Chains in all of these grades may not be the subjects of European
Standards.
- This grading system has also been applied to hooks, links, shackles
and other accessories, indication their strength compatibility with
appropriate grade of chain.
- The stresses in a chain link are not uniform and at the extrados
at the crown particularly, the maximum fiber stress is considerably
greater than the mean stress obtained by diving the force by the total
cross-sectional area of both legs of the link.
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