Technical characteristics
| Parameters | 1М21.12-25 | 1М21.15-32 | 1М21.16-35 | 1М21.20-42 | |
| Section installing pitch, m. | 1,5 | 1,5 | 1,5 | 1,5 | |
| Quantity of hydraulic props in the section, pcs. | 2 | 2 | 2 | 2 | |
| Installation height of the section, mm. | 1200…2500 | 1500…3200 | 1600…3500 | 2000…4200 | |
| Resistivity of the support, kN/m², not less | 1050 | 1050 | 1100 | 1050 | |
| Section resistance, kN, not less | 6150 | 6150 | 6750 | 6150 | |
| Average ground pressure, MPa, not more | 2,3 | 2,3 | 2,4 | 2,3 | |
| Operating pressure, MPa | 43 | 43 | 46 | 43 | |
| Section advance pitch, m. | 0,8 | 0,8 | 0,8 | 0,8 | |
| Section weight, t. | 16,0 | 17,8 | 19,8 | 22,8 | |
The powered support 1М21 consists of two-props sections with four-chain linking system of
the basis with the barrier; the ceiling, equipped with the flap visor with enhanced
effort, which serves as a shield for face keeping by extracting seam thickness above
.5 m. To adjust the section in the seam plane and to protect the workspace under the
support against small stuff extension boards and pusher-jack (with a landside)
installed onto one side are used in the section. It is possible to reinstall
hydraulic cylinders, boards and pusher-jack onto another side, also to manage them
independently separately from both sides of the section.
The powered support 1М21.16-35 was demonstrated at the exhibition «Coal of Russia and Mining» in 2017.