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1) simple structure,, 2) good universal property, 3) operation and maintenance, 4) with safety device, 5) with belt brake - details see: https://www.machineto.com/used-mechanical-power-press-20ton-10133761

Mechanical characteristics:

1. Fram :The frame is of all steel construction, fabricated from Rolled steel plates with suitable cross ribbings. Presses up to 30T will be supplied with C.I. legs. proper alignment of the frame is ensured by machining.
2. Clutch :The clutchis of pin/rolling key-type. the clutch is rigid and well supported. the clutch gives continuous strokes for mass production
3. Crank Shaft :Crank shaft is made of special alloy steel machined to close accuracy and fitted in bronze bushes for smooth working, longer life & accuracy
4. Flywheel :Properly sized flywheel, is made of high grade cast iron, for storing and releasing adequate energy for the pressing operations, and properly balanced for smooth running
5. Gears :Gear are of steel cast or fabricated. Gear teeth are generated by precision hobbing machine
6. Table & Ram :Table and fam are made pf high grade heavy duty cast iron & properly seasoned. They are perfectly aligned, to each other to obtain high accuracy & precision press operation
7. Lubrication :An efficient shot luvrication system has been provided for lubricating the sliding surfaces and moving parts. The lubricant is applied by hand pump
8. Inclining :Inclinable type presses are provided with inclining mechanism which can be easily det and locked in
9. Mechanism :Position by spanners within minutes. the press ils so designed that even in maximum inclined position, it is stable under heavy pressing load

Application:

1. Pressing and withdrawing axle and sleeve
2. Bending and deep drawing sheet metal
3. Straightening, forming, cutting and punching various materials
4. Applied in compression trial.
5. External cover of computer and sheet metal parts
6. OA steel furniture drawer and rail parts
7. External cover of air conditioner ,and sth.liked.

Model			J21S-6.3	J21S-10	J21S-16	J21S-25A	J21S-40A	J21S-63A	J21S-80A	JD21S-100A	JD21S-125A
Nominal force		KN	63	100	160	250	400	630	800	1000	1250
Stroke under nominal force		mm	2	2	2	2.5	4	4	5	6	6
Slide block stroke		Mm	35	60	70	80	120	120	130	140	140
Number of stroke		Min-1	170	145	125	60	55	50	45	38	38
Max die set height		Mm	110	130	170	180	220	270	290	320	320
Die set height adjusdment		mm	30	35	45	70	80	80	100	100	100
Distance from slide block centre to the frame		mm	400	400	400	400	400	450	450	450	450
			700	700	700	700	710	800	800	760	760
Worktable dimensions(f.b*l.r)		mm	200	240	320	400	480	480	4580	710	720
			310	360	480	600	710	710	610	1100	1200
Dimensions of worktable hole (diameter*f*b*l*r)		mm	Φ60	Φ120	Φ100	Φ120	Φ220	Φ200	Φ200	Φ260	Φ260
				120			45	45	45	50	50
				Φ100			Φ180	Φ180	Φ180	Φ220	Φ220
Thickness of bolster		mm	40	50	60	70	80	90	100	120	120
Holedimensions in bed (diameter*f*b*l*r)		mm	Φ140	Φ130	Φ210	200	200	200	220	260	260
			110	90	160	200	240	250	260	290	290
			160	180	240
Dimensions of side block bottom surface(f*b*l*r)		mm	120	150	180	210	270	280	280	420	420
			140	170	200	250	320	320	380	560	560
Size of the handle hole (diameter *depth)		mm	Φ30	Φ30	Φ40	Φ40	Φ50	Φ50	Φ60	60	Φ60
			55	55	60	70	70	80	75	80	80
Distance between columns of body		mm	162	182	220	350	390	450	450	580	580
Motor	Type		Y2-90S-6	Y2-90L-6	Y2-100L-6	Y2-100L1-4	Y2-132M1-6	Y2-132M1-6	Y2-160M-2	Y2-160M-6	Y2-160L-6
	power	Kw	0.75	1.1	1.5	2.2	4	5.5	7.5	7.5	11
Outline dimension(f*b*l*r*h)		mm	1540	1620	1680	1790	1965	2220	2220	2530	2550
			700	730	840	990	1180	1350	1380	1555	1610
			1520	1800	1880	2288	2295	2600	2650	2990	2990
Net/gross weight		kg	820	1060	1940	2860	4400	5500	6020	12500	13500
			920	1160	2185	3360	5100	6300	6820	13800	14800