Locking Elements: Biginners Guide

Beginners Guide

STANDARD NO. CM/0900/LA1
RINGFEDER LOCKING ASSEMBLIES
INDEX

Index and general notes

Basic dimensions

Mechanical properties

Machining tolerances

1. GENERAL NOTES
RINGFEDER locking assemblies are suitable for securing all types of bosses and hubs to shafts and axles.
No keyways or splines are required. Thus notch effect is eliminated and a high polar section modulus is available.
Assemblies require no stops. They can therefore be located and positively locked at any position on the shaft. When locking screws are tightened, the contact surfaces are pressed firmly together to prevent the ingress of dirt and moisture.
True running is assured since the frictional lock connection guarantees no play between mating surfaces. Assemblies can bridge relatively large clearances without significant torque losses. See also notes on sheet 5.
The table of mechanical properties given on sheet 4 is applicable to static, dynamic or impact loading but these figures must not be exceeded. If overloading takes place assemblies will slip, thus safeguarding equipment against damage. However, they must not be used as slipping clutches.
Assemblies may be used in series when the transmissible torques and axial loads are approximately additive.
Reference: RINGFEDER Locking Assemblies S79E. Sept.1978.
S.A. Agents: SURTEES AND SONS (Pty) LTD., Heriotdale.
2. BASIC DIMENSIONS

For Mechanical Properties see: 3 Mechanical properties
For Machining Tolerances see: 4 Machining tolerances

BASIC DIMENSIONS					LOCKING SCREW			MASS kg.
B	D	W	V	L	T	S	No.	MASS kg.
20	47	20	17	27,5	M6	18	8	0,24
22	47	20	17	27,5	M6	18	8	0,23
24	50	20	17	27,5	M6	18	9	0,26
25	50	20	17	27,5	M6	18	9	0,25
28	55	20	17	27,5	M6	18	10	0,3
30	55	20	17	27,5	M6	18	10	0,29
35	60	20	17	27,5	M6	18	12	0,32
40	65	20	17	27,5	M6	18	14	0,34
45	75	24	20	33,5	M8	22	12	0,57
50	80	24	20	33,5	M8	22	12	0,6
55	85	24	20	33,5	M8	22	14	0,63
60	90	24	20	33,5	M8	22	14	0,69
65	95	24	20	33,5	M8	22	16	0,73
70	110	28	24	39,5	M10	25	14	1,26
75	115	28	24	39,5	M10	25	14	1,33
80	120	28	24	39,5	M10	25	14	1,4
85	125	28	24	39,5	M10	25	16	1,49
90	130	28	24	39,5	M10	25	16	1,53
95	135	28	24	39,5	M10	25	18	1,62
100	145	33	26	47,0	M12	30	14	2,01
110	155	33	26	47,0	M12	30	14	2,15
120	165	33	26	47,0	M12	30	16	2,35

For Mechanical Properties see: 3 Mechanical properties
For Machining Tolerances see: 4 Machining tolerances

BASIC DIMENSIONS					LOCKING SCREW			MASS kg.
B	D	W	V	L	T	S	No.	MASS kg.
130	180	38	34	52	M12	35	20	3,51
140	190	38	34	52	M12	35	22	3,85
150	200	38	34	52	M12	35	24	4,07
160	210	38	34	52	M12	35	26	4,3
170	225	44	38	60	M14	40	22	5,78
180	235	44	38	60	M14	40	24	6,05
290	250	52	46	68	M14	45	28	8,25
200	260	52	46	68	M14	45	30	8,65
220	285	56	50	74	M16	50	26	11,22
240	305	56	50	74	M16	50	30	12,2
260	325	56	50	74	M16	50	34	13,2
280	355	66	60	86,5	M18	60	32	19,2
300	375	66	60	86,5	M18	60	36	20,5
320	405	78	72	100,5	M20	70	36	29,6
340	425	78	72	100,5	M20	70	36	31,1
360	455	90	84	116	M22	80	36	42,2
380	475	90	84	116	M22	80	36	44
400	495	90	84	116	M22	80	36	46
420	515	90	84	116	M22	80	40	50
440	545	102	96	130	M24	90	40	64,6
460	565	102	96	130	M24	90	40	67,4
480	585	102	96	130	M24	90	42	71
500	605	102	96	130	M24	90	44	72,6

3. MECHANICAL PROPERTIES
T = TRANSMISSIBLE TORQUE
F = AXIAL FORCE ABSORBED
Ps = PRESSURE BETWEEN LOCKING ASSEMBLY AND SHAFT
PH = PRESSURE BETWEEN LOCKING ASSEMBLY AND HUB
M = TORQUE PER LOCKING SCREW (APPLIED BY TORQUE WRENCH)

B mm	T kNm	F kN	Ps MPa	PH MPa	M Nm	B Mm	T kNm	F kN	Ps MPa	PH MPa	M Nm
20	0,27	27	210	90	14	140	20	298	165	125	125
22	0,30	27	195	90	14	150	24	324	170	125	125
24	0,36	30	195	90	14	160	28	350	170	130	125
25	0,38	30	190	95	14	170	32	386	160	120	190
28	0,47	33	185	95	14	180	37	420	165	125	190
30	0,50	33	175	95	14	190	46	490	150	115	190
35	0,70	40	180	105	14	200	52	525	150	115	190
40	0,92	46	180	110	14	220	68	620	150	115	295
45	1,61	72	210	125	35	240	85	715	160	125	295
50	1,77	71	190	115	35	260	104	800	165	130	295
55	2,27	83	200	130	35	280	128	915	145	115	405
60	2,47	83	180	120	35	300	153	1020	150	120	405
65	3,04	93	190	130	35	320	210	1310	150	120	580
70	4,60	132	210	130	70	340	224	1310	145	115	580
75	4,90	131	195	125	70	360	294	1630	145	115	780
80	5,20	131	180	120	70	380	308	1620	135	110	780
85	6,30	148	195	130	70	400	322	1610	130	105	780
90	6,60	147	180	125	70	420	374	1780	135	110	780
95	7,90	167	195	135	70	440	455	2060	130	105	1000
100	9,60	192	195	135	125	460	470	2040	125	100	1000
110	10,50	191	180	125	125	480	515	2160	125	100	1000
120	13,10	218	185	135	125	500	560	2240	125	100	1000
130	17,60	272	165	115	125

For Physical Dimensions see: 2 Basic dimensions
4. MACHINING TOLERANCES

NOMINAL SHAFT DIA.	MACHINING TOLERANCES		DEVIATION
NOMINAL SHAFT DIA.	SHAFT B (ISO h9)	HUB BORE D. (ISO H9)	SHAFT B & BORE D
20 - 25	+ 0 - 0,052	+ 0,052 - 0	0,127
28 - 30	- 0,062	+ 0,062	0,127
35 - 50	- 0,062	+ 0,062	0,152
55 - 80	- 0,074	+ 0,074	0,178
85 - 120	- 0,087	+ 0,087	0,229
130 - 180	- 0,100	+ 0,100	0,254
190 - 240	- 0,115	+ 0,115	0,305
260 - 300	- 0,130	+ 0,130	0,305
320 - 400	- 0,140	+ 0,140	0,356
420 - 500	- 0,155	+ 0,155	0,406

Machining Tolerances - Shaft and Hub Bore Dimensions
The tapered surfaces of the locking assembly form an angle of approximately 28. The inner and outer rings are split. Consequently, only minor clamping movements and forces are required for radial deformation. For this reason, relatively large deviations from nominal sizes can be bridged without significant torque losses. To prevent excessive distortion of the double tapered thrust rings and to ensure correct functioning of the locking assemblies, it is essential that the assembly is symmetrically located in the annular ring 'a' as shown in the diagram above. When nominal shaft and hub bore sizes are used, this condition automatically exists. Deviations resulting from machining tolerances specified above are easily absorbed by the locking assembly without regard to symmetrical location.
With sizes which deviate from nominal sizes within the limits given in the last column of the table above, it is essential that a smaller diameter shaft be matched with an equivalently larger hub bore or vice versa, thus maintaining locking assembly symmetry within the annular ring 'a'. For example, if the selected shaft diameter B is 0,152 mm undersize, then the hub bore D must be 0,152 mm oversize, i.e. dimensions 'ax' above must be equal within the deviation limits given. When the shaft and hub bore dimensions have been determined, the specified machining tolerances shall be applied.
Required surface finish for shaft and hub bore is NIO i.e. 12,5m

Technical Features

DIMENSIONS			SCREWS CLASS 12		VALUES
d x D mm.	H1 mm.	H mm.	N	Type	MA da Nm	Mt da Nm	Pax da Nm	Pw da N/mm	Pn da N/mm
70 x 110	50	60	8	M 10x50		715	20.400	19,4	10,7
80 x 120	50	60	10	M 10x50	8,3	1.025	25.400	21,2	12,3
90 x 130	50	60	11	M 10x50		1.260	28.000	20,7	12,5
100 x 145	60	70	10	M 12x60		1.860	37.200	20,5	12,6
110 x 155	60	70	10	M 12x60	14,5	2.050	37.200	18,7	11,8
120 x 165	60	70	11	M 12x60		2.450	40.800	18,8	12,2
130 x 180	65	79	14	M 12x65		3.380	52.000	19,7	12,8
140 x 190	65	79	15	M 12x65	14,5	3.900	55.700	19,6	12,0
150 x 200	65	79	15	M 12x65		4.750	55.700	18,3	12,3
160 x 210	65	79	16	M 12x65		4.500	59.300	18,3	12,5
170 x 225	78	92	15	M 14x75	23	6.200	76.400	19,3	13,3
180 x 235	78	92	15	M 14x75		6.700	76.500	18,2	12,7
190 x 250	88	102	16	M 14x80	23	7.000	81.500	16,3	10,3
200 x 260	88	102	18	M 14x80		10.300	102.000	19,4	12,4
220 x 285	96	108	15	M 16x90		11.200	106.000	17,4	11,3
240 x 305	96	108	20	M 16x90	35,5	17.900	141.000	21,2	14,0
260 x 325	96	108	21	M 16x90		19.300	148.000	20,5	13,8
280 x 355	96	110	15	M 20x90	69	23.200	165.000	21,3	14,1
300 x 375	96	110	15	M 20x90		24.900	165.000	19,8	13,4
320 x 405	124	136	20	M 20x110	69	35.400	221.000	19,1	12,5
340 x 425	124	136	20	M 20x110		37.600	221.000	18,0	11,9
360 x 455	140	155	20	M 22x130		49.600	275.000	18,5	11,8
380 x 475	140	155	20	M 22x130		52.400	275.000	17,5	11,3
400 x 495	140	155	22	M 22x130		60.200	301.000	18,3	12,2
420 x 515	140	155	24	M 22x130		69.400	330.000	19,0	12,7
440 x 535	140	155	24	M 22x130		72.800	330.000	16,6	12,3
460 x 555	140	155	24	M 22x130		76.000	330.000	15,9	11,8
480 x 575	140	155	25	M 22x130	93	83.000	344.000	15,9	11,9
500 x 596	140	155	25	M 22x130		86.100	344.000	15,3	11,5
520 x 615	140	155	28	M 22x130		100.300	385.000	16,4	12,4
540 x 625	140	155	28	M 22x130		104.200	385.000	15,8	12,0
560 x 655	140	155	30	M 22x130		115.700	413.000	16,3	12,5
580 x 675	140	155	30	M 22x130		119.900	413.000	15,8	12,1
600 x 695	140	155	30	M 22x130		124.000	413.000	15,3	11,8

Locking Assemblies RINGFEDER RfN 7013.1
For shaft diameters 160mm up to 300mm

	Locking Assembly dimensions					Transmissible		Surface pressure between Locking and Assembly and		Locking screws DIN 912-12.9
d x D	Ltot	L	L1	L2	D1	torques	axial loads	shaft	hub	Qty.	Thread	TA	Weight
d x D	Ltot	L	L1	L2	D1	T	F	p	p1	Qty.	dG	TA	Weight
mm			mm	mm		Nm	kN	N/mm2				Nm	Kg
160 x 210	77	65	53	45,4	220	34000	425	300	131	20	M 12 x 40	145	7,2
170 x 225	89	75	61	51	235	39600	465	184	120	16	M 14 x 50	230	9,5
180 x 235	89	75	61	51	245	47000	522	195	130	18	M 14 x 50	230	10
190 x 250	99	85	71	61,4	260	5540	583	171	112	20	M 14 x 50	230	13
200 x 260	99	85	71	61,4	270	58300	583	163	108	20	M 14 x 50	230	14
220 x 285	111	95	79	65	295	71400	649	155	103	16	M 16 x 60	355	18
240 x 305	111	95	79	65	315	9700	808	178	121	20	M 16 x 60	355	20
260 x 325	111	95	79	65	335	116000	892	181	125	22	M 16 x 60	355	22
280 x 355	121	105	90	75	365	142000	1014	160	113	25	M 16 x 60	355	30
300 x 375	121	105	90	75	385	170000	1133	167	119	28	M 16 x 60	355	32

Explanations

Mounting of Locking Assembly:

d x D, D1, Ltot, L, L1, L2 =

The values for T, Fax, p and p' apply to Locking Assemblies installed in an oiled condition.

Basic dimensions, Locking Assemblies not tightened

dG =

T =

Surface finishes:

Transmissible torque

For shafts and hub bores:

Fax =

Rt < 10 m (< 0,010 mm)

Transmissible axial load

p =

Tolerances:

Maximum surface pressure between Locking Assembly and shaft

We recommend the following tolerances

p' =

shaft: h8

hub: H8

Maximum surface pressure between Locking Assembly and shaft

TA =

Changing of the screw tightening moments:

Maximum tightening torque for the screws considered in order to determine the values T, Fax, p and p'.

A change of the TA values of the above table is inadmissible.

Supplement to CATALOG S77E

Locking Assembly dimensions						Transmissible		Surface Pressure between Locking Assembly and		Locking screws DIN 912-12.9
d x D	Ltot	L	L1	L2	D1	Torques	Axial loads	Shaft p	Hub p'	Thread			Weight kg
d x D	Ltot	L	L1	L2	D1	T or Nm	Fax kN	N/mm2		Qty.	dG	TA Nm	Weight kg
40x65	33,5	27,5	22	18	73	940	45	215	118	10	M 6x20	17	0,38
45x75	41	33	25	20	83	1860	80	314	169	9	M 8x25	41	0,63
50x80	41	33	25	20	88	2070	80	283	160	9	M 8x25	41	0,68
55x85	41	33	25	20	95	2540	90	300	175	10	M 8x25	41	0,73
60x90	41	33	25	20	100	2770	90	274	165	10	M 8x25	41	0,78
65x95	41	33	25	20	105	3580	105	290	178	12	M 8x25	83	0,83
70x110	50	40	30	23	120	5100	140	315	186	10	M 10x35	83	1.3
75x115	50	40	30	23	125	5460	140	294	173	10	M 10x35	83	1.4
80x120	50	40	30	23	130	5850	140	276	163	10	M 10x35	83	1.5
85x125	50	40	30	23	135	7450	175	297	187	12	M 10x35	83	1.55
90x130	50	40	30	23	140	7900	175	280	180	12	M 10x35	83	1.65
95x135	50	40	30	23	145	9900	205	330	217	15	M 10x35	83	1.7
100x145	52,5	42,5	32	25	155	11000	220	290	186	15	M 10x35	83	2.6
110x155	52,5	42,5	32	25	165	12100	220	264	175	15	M 10x35	83	2.8
120x165	52,5	42,5	32	25	175	15700	260	290	196	18	M 10x35	83	3.0
130x180	65	53	40	33	190	20700	320	238	165	15	M 12x40	145	4.6
140x190	65	53	40	33	200	22500	320	222	157	15	M 12x40	145	4.9
150x200	65	53	40	33	210	28500	380	249	179	18	M 12x40	145	5.2
160x210	65	53	40	33	220	34000	425	275	183	20	M 14x50	230	5.5
170x225	78	64	50	40	235	39600	465	231	153	16	M 14x50	230	7.8
180x235	78	64	50	40	245	47000	522	245	166	18	M 14x50	230	8.2
190x250	78	64	50	40	260	55400	583	252	172	20	M 14x50	230	9.5
200x260	78	64	50	40	270	58300	583	240	166	20	M 16x60	355	9.9
220x285	88	72	56	42	295	71400	649	235	160	16	M 16x60	355	13.4
240x305	88	72	56	42	315	97000	808	269	188	20	M 16x60	355	14.3
260x325	88	72	56	42	335	116000	892	274	194	22	M 16x60	355	15.5
280x355	98	82	66	51	365	142000	1014	228	166	25	M 16x60	355	22.9
300x375	98	82	66	51	385	170000	1133	238	175	28	M 16x60	355	24.4

FOR SIZES OTHER THAN THOSE SHOWN PLEASE CONTACT OUR TECHNICAL DEPARTMENT.
DOUBLE TAPERED LOCKING ASSEMBLY TYPE RFN 3012

Dimensions				Performances		Pressure		Clamping screws DIN 912-12.9
d x D mm.	H2 mm.	H mm.	H1 mm.	Mt da Nm	Pax da Nm	Pw da N/mm	Pn da N/mm	size Typ	Ms daNm
45 x 75	72	56	64	385	17.200	18.4	10.9	M 8	4.1
48 x 80	72	56	64	410	17.200	16.9	10.4	M8	4.1
50 x 80	72	56	64	425	17.200	16.4	10.4	M 8	4.1
55 x 85	72	56	64	475	17.200	14.9	9.4	M 8	4.1
60 x 90	72	56	64	635	21.100	16.9	10.9	M 8	4.1
65 x 95	72	56	64	685	21.100	15.4	10.4	M 8	4.1
70 x 110	88	70	78	1.175	33.600	18.4	11.4	M 10	8.3
75 x 115	88	70	78	1.265	33.600	16.9	10.9	M 10	8.3
80 x 120	88	70	78	1.465	36.700	17.4	11.4	M 10	8.3
85 x 125	88	70	78	1.565	36.700	16.4	10.9	M 10	8.3
90 x 130	88	70	78	1.795	39.800	16.9	11.4	M 10	8.3
95 x 135	88	70	78	1.895	39.800	15.9	10.9	M 10	8.3
100 x 145	112	90	100	2.685	53.600	15.9	10.9	M 12	14.5
110 x 155	112	90	100	3.195	58.100	15.4	10.9	M 12	14.5
120 x 165	112	90	100	4.025	67.100	16.4	11.9	M 12	14.5
130 x 180	128	104	116	5.195	79.800	15.4	11.4	M 14	23
140 x 190	130	104	116	6.455	92.100	16.9	12.4	M 14	23
150 x 200	130	104	116	7.375	98.300	16.4	12.4	M 14	23
160 x 210	130	104	116	8.365	104.300	16.4	12.4	M 14	23
170 x 225	162	134	146	10.895	128.100	14.9	11.4	M 16	35.5
180 x 235	162	134	146	12.315	136.700	14.9	11.4	M 16	35.5
190 x 250	162	134	146	13.795	145.200	14.9	11.4	M 16	35.5
200 x 260	162	134	146	14.535	145.200	14.4	10.9	M 16	35.5
220 x 285	162	134	146	18.795	170.800	15.4	11.9	M 16	35.5
240 x 305	162	134	146	22.495	187.800	15.4	11.9	M 16	35.5
260 x 325	162	134	146	24.395	187.800	14.4	11.4	M 16	35.5
280 x 355	197	165	177	37.295	266.800	15.4	11.9	M 20	69
300 x 375	197	165	177	43.994	292.800	15.4	12.4	M 20	69
320 x 405	197	165	177	46.995	292.800	14.4	11.4	M 20	69
340 x 425	197	165	177	54.400	320.000	14.9	11.9	M 20	69
360 x 455	224	190	202	65.800	365.000	13.9	10.9	M 22	93
380 x 475	224	190	202	82.100	432.000	15.9	12.9	M 22	93
400 x 495	224	190	202	86.400	432.000	14.9	11.9	M 22	93
420 x 515	224	190	202	90.700	432.000	14.4	11.9	M 22	93
440 x 535	224	190	202	95.000	432.000	13.9	11.4	M 22	93
460 x 555	224	190	202	99.300	432.000	12.9	10.9	M 22	93
480 x 575	224	190	202	119.600	498.000	14.4	11.9	M 22	93
500 x 596	224	190	202	124.600	498.000	13.9	11.9	M 22	93
520 x 615	224	190	202	138.200	531.000	13.9	11.9	M 22	93
540 x 625	224	190	202	143.600	531.000	13.9	11.9	M 22	93
560 x 655	224	190	202	158.200	565.000	13.9	11.9	M 22	93
580 x 675	224	190	202	163.800	565.000	13.4	11.4	M 22	93
600 x 695	224	190	202	169.500	565.000	12.9	10.9	M 22	93

Legend

Ms (daNm):

Screws tightening torque

Mt (daNm):

Transmissible torque

Pax (daN):

Transmissible axial force

Pw (daN/mm):

Shaft surface pressure

Pn (daN/mm):

Hub surface pressure

RINGFEDER TYPE 40 RIGID FLANGE COUPLING FOR KEYLESS SHAFTS

Ringfeder Rigid Flange coupling Type 40, locally manufactured to the German DIN spec ideal for shaft mounting drives.
Hollow shaft gearboxes are out. Ringfeder flange mounting is in. no more burning of shafts to change bearings.
No maintenance, no keyway, shaft diameters can be reduced by up to 30%. The proven one - To change drives, is so simple - Just fit and forget.
Fitted with RFN 3012 self-centring imported locking elements.

Click Here For Table

RINGFEDER/STUWE TRUE RUNNING RIGID FLANGE COUPLING FOR SIMILTANEOUS TORQUE TRANSMISSION AND BENBING

Tpye	dw mm	Mt max Nm	MD Nm	N mm	R mm	L mm	l mm	f mm	t mm	Shrink disc size	X
FK RAG 400-100	95	15100	4500	400	300	104	55	30	6	140-71	32
	105	20100
FK RAG 400-110	105	22000	6000	400	300	108	59	30	6	155-71	32
	115	28000
FK RAG 400-120	115	31000	7800	400	300	114	65	30	6	165-71	34
	125	39000
FK RAG 400-130	125	40000	10000	400	300	114	73	30	6	175-71	34
	140	52000

Tpye	dw mm	Mt max Nm	MD Nm	N mm	R mm	L mm	l mm	f mm	t mm	Shrink disc size	X
FK RAG 560-150	145	72000	15200	560	280	139	81	36	8	200-71	38
	160	90000
FK RAG 560-170	160	100000	18500	560	280	157	98	36	8	220-71	38
	170	116000
FK RAG 560-190	170	120000	26200	560	280	161	104	36	8	240-71	38
	190	158000
FK RAG 560-210	190	164000	36000	560	280	184	115	36	8	260-71-3	38
	210	204000

Tpye	dw mm	Mt max Nm	MD Nm	N mm	R mm	L mm	l mm	f mm	t mm	Shrink disc size	X
FK RAG 630-200	190	164000	36000	630	350	188	115	40	8	260-71	38
	210	204000
FK RAG 630-220	210	217000	48000	630	350	196	126	40	8	280-71	42
	230	273000
FK RAG 630-240	230	262000	62200	630	350	204	136	40	8	300-71	42
	245	308000

Tpye	dw mm	Mt max Nm	MD Nm	N mm	R mm	L mm	l mm	f mm	t mm	Shrink disc size	X
FK RAG 710-260	250	394000	79000	710	550	220	148	40	8	340-71	42
	270	466000

Mt (Max transmittable torque)
Mb (Max bending moment not to be exceeded)
RIBGFEDER TYPE 30 RIGID FLANGE COUPLING

Ringfeder Rigid Flange coupling Type 30, locally manufactured to the German DIN spec ideal for shaft mounting drives.
Hollow shaft gearboxes are out. Ringfeder flange mounting is in. no more burning of shafts to change bearings.
No maintenance, no keyway, shaft diameters can be reduced by up to 30%. The proven one - To change drives, is so simple - Just fit and forget.
Out of all other flange couplings it is the only one that can be easily removed

Click Here For Table

Explanations	Mounting of Locking Assembly:
d x D, D1, Ltot, L, L1, L2 =	The values for T, Fax, p and p' apply to Locking Assemblies installed in an oiled condition.
Basic dimensions, Locking Assemblies not tightened
dG =
T =	Surface finishes:
Transmissible torque	For shafts and hub bores:
Fax =	Rt < 10 m (< 0,010 mm)
Transmissible axial load
p =	Tolerances:
Maximum surface pressure between Locking Assembly and shaft	We recommend the following tolerances
p' =	shaft: h8	hub: H8
Maximum surface pressure between Locking Assembly and shaft
TA =	Changing of the screw tightening moments:
Maximum tightening torque for the screws considered in order to determine the values T, Fax, p and p'.	A change of the TA values of the above table is inadmissible.

Ms (daNm):	Screws tightening torque
Mt (daNm):	Transmissible torque
Pax (daN):	Transmissible axial force
Pw (daN/mm):	Shaft surface pressure
Pn (daN/mm):	Hub surface pressure