Description

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SHF linear shaft support is a compact, two-hole end support used to clamp a metric round shaft at a fixed mounting position. Its split-clamp structure secures the shaft with a separate clamping bolt, while two side mounting holes fasten the support to the machine frame.

The series covers shaft diameters from 3 to 60 mm. It is suitable for machines where the shaft must be mounted from a vertical plate, side frame or end bracket and where the shaft position needs to remain fixed during linear bearing travel.

SHF supports can be supplied separately or matched with shafts from the DLY linear shaft range.

Clamping Structure

The shaft passes through the central bore of the SHF support. Tightening the clamping bolt closes the split section around the shaft, producing a radial clamping force. This construction allows the shaft to be secured without drilling a cross hole or adding a setscrew directly against the shaft surface.

Split Bore

The opening above the bore allows the support to contract around the shaft when the clamping bolt is tightened.

Two Mounting Holes

The oval body has two mounting holes positioned on opposite sides of the shaft centre for attachment to the machine frame.

Separate Bolt Functions

The clamping bolt locks the shaft inside the bore; the mounting bolts fasten the complete support to the installation surface.

Dimensions

The dimensional drawing separates the clamping bolt from the two mounting holes marked as 2-S. Before selecting a model, confirm the shaft diameter together with the mounting-hole pitch B, overall width W and installation height F.

Model	Shaft Ø	W	L	T	F	G	B	S	Clamping Bolt	Mounting Bolt	Weight (g)
SHF3	3	43	10	5	24	20	32	5.5	M4	M5	13
SHF4	4	43	10	5	24	20	32	5.5	M4	M5	13
SHF5	5	43	10	5	24	20	32	5.5	M4	M5	13
SHF6	6	43	10	5	24	20	32	5.5	M4	M5	13
SHF8	8	43	10	5	24	20	32	5.5	M4	M5	13
SHF10	10	43	10	5	24	20	32	5.5	M4	M5	13
SHF12	12	47	13	7	28	25	36	5.5	M4	M5	20
SHF13	13	47	13	7	28	25	36	5.5	M4	M5	20
SHF16	16	50	16	8	31	28	40	5.5	M4	M5	27
SHF20	20	60	20	8	37	34	48	7	M5	M6	40
SHF25	25	70	25	10	42	40	56	7	M5	M6	60
SHF30	30	80	30	12	50	46	64	9	M6	M8	110
SHF35	35	92	35	14	58	50	72	12	M8	M10	380
SHF40	40	102	40	16	67	56	80	12	M10	M10	510
SHF50	50	122	50	19	83	70	96	14	M12	M12	890
SHF60	60	140	60	23	95	82	112	14	M12	M12	1500

Model Selection

The number in the SHF model corresponds to the nominal shaft diameter, but bore diameter alone is not sufficient for replacement. The surrounding mounting dimensions and bolt specifications change as the support size increases.

Shaft diameter: select the SHF number that matches the nominal diameter of the round shaft.
Mounting-hole pitch: check B before machining or reusing the mounting plate.
Installation height: F and G affect the vertical position of the shaft centre relative to the machine frame.
Plate clearance: confirm W and the available clearance around the clamping bolt.
Bolt selection: distinguish between the clamping-bolt designation and the two mounting-bolt designations shown in the table.

Support Position and Shaft Span

A pair of SHF supports fixes the two ends of a round shaft. The unsupported distance between them affects shaft deflection under load. Increasing the shaft diameter or reducing the support span can improve stiffness, but the required diameter should be checked according to load direction, bearing position and travel length.

The SHF block fixes the shaft position; it does not compensate for an undersized shaft or an excessively long unsupported span. In two-shaft mechanisms, the relative position of both support pairs also affects linear-bearing alignment.

SHF and SK Supports

Both SHF and SK products are used to hold round shafts, but their body shapes and mounting arrangements are different. SHF has a wide oval body with two side mounting holes, while SK uses a pedestal-style base. Selection should follow the available mounting surface and shaft-centre position rather than treating them as dimensionally interchangeable.

SHF and SK end support blocks for linear shafts

View SK Shaft End Support Block

Installation

Confirm that the shaft diameter and SHF bore size match before assembly.
Clean the shaft end, support bore and mounting surface. Remove burrs around the plate holes.
Insert the shaft into both supports while leaving the clamping bolts loose.
Position the supports on the mounting surface and start both mounting bolts without fully tightening them.
Align the shaft with the mating linear bearing or slide unit, then tighten the mounting bolts evenly.
Tighten the clamping bolts after the final shaft position has been established.
Move the carriage through its full travel and check for binding before powered operation.

Do not use the clamping bolt to pull a misaligned shaft into position. The shaft and support bores should already be aligned before final tightening.

Applications

Round-shaft positioning tables

Inspection fixtures

Packaging machine adjustments

Printing and labeling mechanisms

Small transfer devices

Laboratory automation equipment

FAQ

Q: Does SHF clamp the shaft or only support it?

A: SHF uses a split bore and clamping bolt to hold the shaft radially. The two side mounting bolts secure the complete support to the machine frame.

Q: Does SHF20 use M5 or M6 bolts?

A: SHF20 uses an M5 clamping bolt and M6 mounting bolts. These two bolt functions should not be confused during ordering or installation.

Q: Can one SHF support hold a linear shaft?

A: A typical linear-motion arrangement uses a support at each end of the shaft. Using only one support leaves the other end unconstrained and may not provide the required stiffness or alignment.

Q: Can SHF be used with SCS linear bearing blocks?

A: Yes, when the shaft diameter, support layout and travel arrangement match. SHF fixes the shaft ends while the SCS block moves along the unsupported round shaft.

Q: What information is needed for quotation?

A: Provide the SHF model or shaft diameter, required quantity, matching shaft length and any special packaging or dimensional requirements. A mounting drawing is helpful when replacing an existing support.