TAS Schäfer 3014 Locking Assemblies — Models, Torque Ratings and Installation Data

The 3014 combines an outer sleeve, inner sleeve and two pressure rings. The arrangement keeps the hub position unchanged during assembly. The rear pressure ring must bear against a stop so the assembly can be dismantled.

TAS Schäfer 3014 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	No axial displacement
Self-centering	Very good
Self-locking	Low
Recommended shaft tolerance / surface	k9–h9 / Rz10
Recommended hub tolerance / surface	N9–H9 / 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 19 catalog size rows, from d = 70 mm to d = 300 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)	L1 (mm)	L2 (mm)	L3 (mm)	Weight (kg)
TAS 3014/70/120	70	120	7136	204	206	120	8	M12x055	145	56	62	74	3.2
TAS 3014/80/130	80	130	12233	306	271	166	12	M12x055	145	56	62	74	3.6
TAS 3014/90/140	90	140	13762	306	240	155	12	M12x055	145	56	62	74	3.9
TAS 3014/100/160	100	160	20967	419	219	137	12	M14x070	235	72	82	96	7.0
TAS 3014/110/170	110	170	26908	489	233	151	14	M14x070	235	72	82	96	7.5
TAS 3014/120/180	120	180	31450	524	228	152	15	M14x070	235	72	82	96	8.0
TAS 3014/130/190	130	190	34071	524	211	144	15	M14x070	235	72	82	96	8.5
TAS 3014/140/200	140	200	41585	594	222	155	17	M14x070	235	72	82	96	9.1
TAS 3014/150/210	150	210	47176	629	219	151	18	M14x070	235	72	82	96	9.6
TAS 3014/160/230	160	230	65643	821	231	161	17	M16x080	365	84	94	110	13.8
TAS 3014/170/240	170	240	73848	869	230	163	18	M16x080	365	84	94	110	14.5
TAS 3014/180/250	180	250	86880	965	241	174	20	M16x080	365	84	94	110	15.3
TAS 3014/190/260	190	260	96292	1014	240	175	21	M16x080	365	84	94	110	16.0
TAS 3014/200/270	200	270	111013	1110	250	185	23	M16x080	365	84	94	110	17.0
TAS 3014/220/300	220	300	135579	1233	198	145	21	M18x100	500	105	116	134	27.0
TAS 3014/240/320	240	320	169033	1408	208	156	24	M18x100	500	105	116	134	29.2
TAS 3014/260/340	260	340	183119	1409	192	147	24	M18x100	500	105	116	134	31.3
TAS 3014/280/370	280	370	252994	1807	194	147	24	M20x120	710	125	136	156	45.0
TAS 3014/300/390	300	390	271065	1807	181	139	24	M20x120	710	125	136	156	47.7

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.

L1 is the length of the inner and outer sleeves, L2 is the width without screws and L3 includes the screws. Provide the required stop behind pressure ring 2: omitting it can prevent correct dismantling. The recommended shaft and hub tolerance ranges differ from the h8/H8 pairing used by many other series.

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.