TAS Schäfer 3003 Plus Locking Assemblies — Models, Torque Ratings and Installation Data

A sleeve and one pressure ring form a compact internal friction connection. The Plus series has its own capacity table and must be selected independently of the standard 3003 design.

TAS Schäfer 3003 Plus locking assembly — series schematic

Operating principle and connection design

Conical contact surfaces convert an axial clamping action into radial pressure. The inner contact grips the shaft while the outer contact expands against the hub bore. Torque is transmitted through friction over the contact surfaces, producing a backlash-free connection without requiring a keyway for torque transmission. The assembly is placed internally between the shaft and the hub; both mating components therefore form part of the load-carrying system.

Series characteristics and mating surfaces

Characteristic	Series detail
Assembly positioning	Axial displacement
Self-centering	Good
Self-locking	Low
Recommended shaft tolerance / surface	h8 / Rz10
Recommended hub tolerance / surface	H8 / Rz10
Bending-moment share limit	MB,max = 0.3 × Mt
Maximum bending angle	5 arcminutes

Axial movement in this table describes behavior during installation. Self-centering describes the assembly’s locating action; it does not eliminate the need to check the shaft and hub geometry, runout requirements and bearing arrangement. Self-locking describes the cone behavior and determines the release procedure, rather than the operating torque rating.

Size and capacity table

The table covers 42 catalog size rows, from d = 20 mm to d = 400 mm. Select by the complete d/D combination. Dimensions and ratings are specific to each row; larger nominal diameters do not necessarily mean every rating increases. Decimal points are used throughout.

Ordering designation	d — shaft (mm)	D — hub bore (mm)	Mt — torque (Nm)	Fax — axial force (kN)	pW — shaft pressure (N/mm²)	pN — hub pressure (N/mm²)	Z — screws (pcs)	S — screw size	MA — tightening torque (Nm)	L (mm)	L1 (mm)	L2 (mm)	L3 (mm)	Weight (kg)
TAS 3003/20/47 plus	20	47	360	36	281	119	5	M6x020	14	17	22	28	34	0.2
TAS 3003/22/47 plus	22	47	390	36	255	119	5	M6x020	14	17	22	28	34	0.25
TAS 3003/24/50 plus	24	50	430	36	234	112	5	M6x020	14	17	22	28	34	0.3
TAS 3003/25/50 plus	25	50	540	43	270	135	6	M6x020	14	17	22	28	34	0.3
TAS 3003/28/55 plus	28	55	600	43	241	123	6	M6x020	14	17	22	28	34	0.4
TAS 3003/30/55 plus	30	55	640	43	225	123	6	M6x020	14	17	22	28	34	0.35
TAS 3003/32/60 plus	32	60	920	58	281	150	8	M6x020	14	17	22	28	34	0.4
TAS 3003/35/60 plus	35	60	1000	58	257	150	8	M6x020	14	17	22	28	34	0.38
TAS 3003/38/65 plus	38	65	1000	58	236	138	8	M6x020	14	17	22	30	36	0.45
TAS 3003/40/65 plus	40	65	1100	58	225	138	8	M6x020	14	17	22	30	36	0.4
TAS 3003/45/75 plus	45	75	2400	110	325	195	8	M8x025	35	20	25	34	42	0.7
TAS 3003/50/80 plus	50	80	2700	110	293	183	8	M8x025	35	20	25	34.5	42.5	0.75
TAS 3003/55/85 plus	55	85	3000	110	266	172	8	M8x025	35	20	25	34.5	42.5	0.8
TAS 3003/60/90 plus	60	90	3300	110	244	163	8	M8x025	35	20	25	34.5	42.5	0.8
TAS 3003/65/95 plus	65	95	4000	124	253	173	9	M8x025	35	20	25	34.5	42.5	0.9
TAS 3003/70/110 plus	70	110	6000	173	274	174	8	M10x030	69	24	29	41	51	1.6
TAS 3003/75/115 plus	75	115	6500	173	255	167	8	M10x030	69	24	29	41	51	1.7
TAS 3003/80/120 plus	80	120	6900	173	239	160	8	M10x030	69	24	29	41	51	1.8
TAS 3003/85/125 plus	85	125	8200	195	254	172	9	M10x030	69	24	29	41	51	1.9
TAS 3003/90/130 plus	90	130	8700	195	239	166	9	M10x030	69	24	29	41	51	2.0
TAS 3003/95/135 plus	95	135	10200	217	252	177	10	M10x030	69	24	29	41	51	2.0
TAS 3003/100/145 plus	100	145	14200	285	291	201	9	M12x035	120	26	31	46	58	2.8
TAS 3003/110/155 plus	110	155	15600	285	265	188	9	M12x035	120	26	31	46	58	3.0
TAS 3003/120/165 plus	120	165	17100	285	242	176	9	M12x035	120	26	32	46	58	3.2
TAS 3003/130/180 plus	130	180	25100	387	232	168	9	M14x040	190	34	40	57	71	4.7
TAS 3003/140/190 plus	140	190	27100	387	216	159	9	M14x040	190	34	40	57	71	5.0
TAS 3003/150/200 plus	150	200	32200	430	224	168	10	M14x040	190	34	40	57	71	5.4
TAS 3003/160/210 plus	160	210	41200	516	252	192	12	M14x040	190	34	40	57	71	5.6
TAS 3003/170/225 plus	170	225	43800	516	183	138	12	M14x040	190	44	50	67	81	7.9
TAS 3003/180/235 plus	180	235	46400	516	173	132	12	M14x040	190	44	50	67	81	8.3
TAS 3003/190/250 plus	190	250	67800	714	227	172	12	M16x050	295	44	50	67.5	83.5	10.0
TAS 3003/200/260 plus	200	260	71300	714	215	166	12	M16x050	295	44	50	67.5	83.5	10.5
TAS 3003/220/285 plus	220	285	78500	714	172	133	12	M16x050	295	50	56	76	92	14.2
TAS 3003/240/305 plus	240	305	107000	892	197	155	15	M16x050	295	50	56	76	92	15.2
TAS 3003/260/325 plus	260	325	139000	1071	219	175	18	M16x050	295	50	56	76	92	16.4
TAS 3003/280/355 plus	280	355	159000	1136	179	141	16	M18x060	405	60	66	88	106	23.9
TAS 3003/300/375 plus	300	375	191000	1278	188	151	18	M18x060	405	60	66	88	106	25.6
TAS 3003/320/405 plus	320	405	265000	1660	186	147	18	M20x060	580	74	81	104	124	36.9
TAS 3003/340/425 plus	340	425	329000	1937	204	163	21	M20x060	580	74	81	104	124	38.9
TAS 3003/360/455 plus	360	455	374000	2081	178	141	18	M22x060	780	86	94	120	142	53.5
TAS 3003/380/475 plus	380	475	461000	2428	197	158	21	M22x060	780	86	94	120	142	56.1
TAS 3003/400/495 plus	400	495	485000	2428	187	151	21	M22x060	780	86	94	120	142	58.7

Reading torque, force and dimensional values

Mt is the maximum transmitted torque when the external axial force is zero. Fax is the maximum transmitted axial force when the working torque is zero. They are separate limiting cases, so a connection carrying both torque and axial force needs a combined-load assessment. pW and pN are the average contact pressures on the shaft and hub. Z is the clamping-screw quantity, S identifies the screw size and length, and MA is the installation tightening torque for each clamping screw. MA must not be confused with the much larger torque transmitted by the shaft connection.

L is the pressure-ring length, L1 the pressure-ring distance, L2 the width without screws and L3 the overall width with screws. Where D1 is listed, allow space for that larger envelope as well as the hub bore D. Check the axial movement during tightening when setting a hub against neighboring parts.

Load selection and hub strength

Determine the peak operating torque, reversals, starting events, axial loads, radial loads and any bending moment before selecting a size. The bending share listed for this series is an application limit requiring a combined-load check, not an additional independent load allowance. Shaft and hub material strength, hub outside diameter, hollow-shaft wall thickness and local geometry must support the listed contact pressure. Radial force and bending can increase pressure on one side of the contact and reduce it on the other. The pressure and stiffness assessment therefore remains necessary even when the nominal torque is within the table value.

Installation and removal

Clean the shaft and hub contact surfaces and apply the specified film of oil so the friction condition is controlled. Position the supplied assembly and align the hub before tightening. Use the series-specific screw sequence and bring all screws to the stated MA value with a suitable torque wrench. Retain the specified screw condition and lubrication requirements. Where the design permits axial movement, allow for it while setting the final hub position. For dismantling, follow the prescribed release sequence and any press-off provision for the self-locking cone.

Application and ordering information

Typical internal-clamping applications include gears, sprockets, pulleys and conveyor drums. Match the required torque and positioning behavior to the actual machine duty rather than choosing by diameter alone. State the series, shaft diameter d, hub bore D, load case, shaft and hub materials, available installation space and environmental conditions when ordering. Stainless versions are offered within the wider product group, but their material, size availability and ratings must be confirmed for the requested version. Do not apply standard-version capacity values automatically to a different material or special design.