Locking Assemblies RfN 7012.2

The original RINGFEDER^® Locking Assemblies featuring double-tapered thrust rings with self-releasing tapers. They bridge relatively large fit clearances, are easy to install, adjust or remove, but are not self-centering. A pre-centering hub section is usually required.

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Product Characteristics

Slimmest design, especially suitable for applications where space is limited. The Locking Assembly RfN 7012 compensates small tolerance deviations and compensates small mounting errors.
Large transmittable forces and moments – several Locking Assemblies RfN 7012 can be placed one behind the other. The transmissible torque and axial forces are added - please take in this respect consulting with our technical experts.
Bending moment and radial loads – combined loads can be transmitted. (Please contact our technical department for assistance).
Easy installation – RfN 7012 Locking Assemblies can bridge large clearances without the loss of transmission values.
Low risk to contamination – during the tightening process the functional surfaces of the device and connection are pressed together generating a surface pressure that does not allow the ingress of contamination.
Free from wear – the Locking Assembly RfN 7012 works without moving parts on shaft and hub, through this, abrasive wear and backlash are avoided. Thus, RfN 7012 can be repeatedly clamped and released.

Example applications

chain wheels
levers
pulleys
slip-on gear mechanisms
belt drums
running wheels
cable sheaves

Mounting of Locking Assembly

The Locking Assemblies are supplied slightly oiled and ready-to-use. The values for T, F_ax, p_W and p_N apply to Locking Assemblies in delivery condition.

Surface finishes

For shafts and hub bores R_a = 3,2 μm

Tolerances

We recommend the following mounting tolerances

Shaft: k9-h9; Hub: N9-H9
Max. admissible Shaft: k11-h11; Hub: N11-H11

To avoid excessive deformations of the relatively thickwalled thrust rings, the Locking Assembly should be located as symmetrically as possible between shaft and hub bore. If the shaft is smaller than nominal d, the bore should exceed nominal D to the same extent and vice versa. The concentricity quality is determined by the direct centering between shaft and hub.

Arrangement of several Locking Assemblies RfN 7012

If several Locking Assemblies are to be installed the transmission values of the table can be added when the Locking Assemblies are located within a distance of 4·L.

Change of screw tightening torques

The Locking Assemblies are equipped with 12.9 grade screws. A reduction of the screw tightening torque is possible. The lowest allowable screw tightening torque results from the multiplication of the T_A-value by 0,5. There is an approximate linear relationship between T, T_A , F_ax, p_W and p_N.

Auxiliary threads

To facilitate removal, the front thrust rings have auxiliary threads.

360° Product View

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Technical Data & CAD Models

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d mm	D mm	L mm	L₁ mm	L₃ mm	T Nm	p_W N/mm²	p_N N/mm²	D_G mm	T_A Nm	D_{N min} bei Rp_0,2400 N/mm² mm	T_max Nm
130	180	52	38	34	22568	208	150	12	145	227	29558
140	190	52	38	34	29285	233	172	12	145	248	38533
150	200	52	38	34	31242	217	162	12	145	257	41286
160	210	52	38	34	36077	220	168	12	145	272	47868
170	225	60	44	38	43873	212	160	14	230	288	58433
180	235	60	44	38	50697	218	167	14	230	305	67763
190	250	68	52	46	62608	200	152	14	230	316	83967
200	260	68	52	46	68125	196	151	14	230	328	91660
220	285	74	56	50	89763	197	152	16	355	360	121495
240	305	74	56	50	101288	187	147	16	355	383	137841
260	325	74	56	50	125978	198	158	16	355	415	172302
280	355	86,5	66	60	157579	178	140	18	485	440	216523
300	375	86,5	66	60	173905	171	137	18	485	463	239989
320	405	100,5	78	72	239969	173	136	20	690	499	332496
340	425	100,5	78	72	262469	167	134	20	690	522	365053
360	455	116	90	84	349828	170	135	22	930	560	488295
380	475	116	90	84	379517	166	133	22	930	582	531530
400	495	116	90	84	410280	162	131	22	930	605	576460
420	515	116	90	84	467378	167	136	22	930	635	658690
440	545	130	102	96	574502	164	132	24	1200	668	812021
460	565	130	102	96	615138	161	131	24	1200	690	871875
480	585	130	102	96	657024	158	129	24	1200	713	933724
500	605	130	102	96	717664	159	131	24	1200	739	1022508
520	630	130	102	96	762703	156	129	24	1200	767	1089345
540	650	130	102	96	808986	153	127	24	1200	790	1158177
560	670	130	102	96	875976	154	129	24	1200	816	1256937
580	690	130	102	96	945507	155	131	24	1200	842	1359686
600	710	130	102	96	996807	153	129	24	1200	865	1436499
620	730	130	102	96	1049341	151	128	24	1200	888	1515307
640	750	130	102	96	1147229	155	132	24	1200	918	1659954
660	770	130	102	96	1226223	156	133	24	1200	944	1777667
680	790	130	102	96	1261026	151	130	24	1200	963	1831536
700	810	130	102	96	1295765	146	126	24	1200	982	1885405
720	830	130	102	96	1330443	142	123	24	1200	1001	1939274
740	850	130	102	96	1415618	143	124	24	1200	1028	2066962
760	870	130	102	96	1503294	144	126	24	1200	1054	2198641
780	890	130	102	96	1566909	142	125	24	1200	1077	2295406
800	910	130	102	96	1631741	141	124	24	1200	1099	2394165

d inch	D inch	L inch	L₁ inch	L₃ inch	T ft-lbs	p_W psi	p_N psi	D_G mm	T_A ft-lbs	D_{N min} bei Rp_0,2400 N/mm² inch	T_max ft-lbs
5.118	7.087	2.047	1.496	1.339	16646	30145	21739	12	107	8.937	21801.000
5.512	7.480	2.047	1.496	1.339	21600	33819	24965	12	107	9.764	28420.785
5.906	7.874	2.047	1.496	1.339	23043	31449	23478	12	107	10.118	30451.000
6.299	8.268	2.047	1.496	1.339	26609	31884	24348	12	107	10.709	35306.000
6.693	8.858	2.362	1.732	1.496	32359	30725	23188	14	170	11.339	43099.000
7.087	9.252	2.362	1.732	1.496	37393	31594	24203	14	170	12.008	49980.000
7.480	9.843	2.677	2.047	1.811	46178	28986	22029	14	170	12.441	61932.000
7.874	10.236	2.677	2.047	1.811	50247	28406	21884	14	170	12.913	67606.000
8.661	11.220	2.913	2.205	1.969	66207	28551	22029	16	262	14.173	89611.000
9.449	12.008	2.913	2.205	1.969	74707	27101	21304	16	262	15.079	101668.000
10.236	12.795	2.913	2.205	1.969	92918	28696	22899	16	262	16.339	127085.000
11.024	13.976	3.406	2.598	2.362	116226	25797	20290	18	358	17.323	159701.000
11.811	14.764	3.406	2.598	2.362	128267	24783	19855	18	358	18.228	177009.000
12.598	15.945	3.957	3.071	2.835	176994	25072	19710	20	509	19.646	245240.000
13.386	16.732	3.957	3.071	2.835	193590	24203	19420	20	509	20.551	269253.000
14.173	17.913	4.567	3.543	3.307	258023	24638	19565	22	686	22.047	360153.000
14.961	18.701	4.567	3.543	3.307	279921	24058	19275	22	686	22.913	392042.000
15.748	19.488	4.567	3.543	3.307	302611	23478	18986	22	686	23.819	425181.000
16.535	20.276	4.567	3.543	3.307	344725	24203	19710	22	686	25.000	485831.000
17.323	21.457	5.118	4.016	3.780	423737	23768	19130	24	885	26.299	598924.000
18.110	22.244	5.118	4.016	3.780	453709	23333	18986	24	885	27.165	643071.000
18.898	23.031	5.118	4.016	3.780	484602	22899	18696	24	885	28.071	688689.000
19.685	23.819	5.118	4.016	3.780	529329	23043	18986	24	885	29.094	754173.000
20.472	24.803	5.118	4.016	3.780	562548	22609	18696	24	885	30.197	803470.000
21.260	25.591	5.118	4.016	3.780	596685	22174	18406	24	885	31.102	854239.000
22.047	26.378	5.118	4.016	3.780	646095	22319	18696	24	885	32.126	927081.000
22.835	27.165	5.118	4.016	3.780	697379	22464	18986	24	885	33.150	1002866.000
23.622	27.953	5.118	4.016	3.780	735217	22174	18696	24	885	34.055	1059521.000
24.409	28.740	5.118	4.016	3.780	773964	21884	18551	24	885	34.961	1117648.000
25.197	29.528	5.118	4.016	3.780	846164	22464	19130	24	885	36.142	1224335.000
25.984	30.315	5.118	4.016	3.780	904428	22609	19275	24	885	37.165	1311157.000
26.772	31.102	5.118	4.016	3.780	930097	21884	18841	24	885	37.913	1350890.000
27.559	31.890	5.118	4.016	3.780	955720	21159	18261	24	885	38.661	1390622.000
28.346	32.677	5.118	4.016	3.780	981297	20580	17826	24	885	39.409	1430354.000
29.134	33.465	5.118	4.016	3.780	1044120	20725	17971	24	885	40.472	1524533.000
29.921	34.252	5.118	4.016	3.780	1108787	20870	18261	24	885	41.496	1621656.000
30.709	35.039	5.118	4.016	3.780	1155708	20580	18116	24	885	42.402	1693027.000
31.496	35.827	5.118	4.016	3.780	1203526	20435	17971	24	885	43.268	1765869.000