Hard Locking Bearing Nuts

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MISUMI

Compared to a normal bearing nut, it is not necessary to machine the keyway on the lock washer and the shaft.

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Back to the Category Groove Nuts/Shaft Nuts

Technical drawing - Locknuts

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Available dimensions and tolerances can be found under the tab More information.

Basic properties (e.g., material, hardness, coating, tolerance) - Locknuts

Type		Material	Hardness	Surface Treatment
Standard	Thin Type	Material	Hardness	Surface Treatment
HLB	-	EN 1.0038 Equiv.	-	Parker
HLBM	-	EN 1.0038 Equiv.	-	Electroless Nickel Plating
HLBC	HLBU	EN 1.1191 Equiv. Thermal Refined	22~28HRC	Parker
HLBS	-	EN 1.4301 Equiv.	-	-

For further specifications please see the More information tab.

Composition of a product code - Locknuts

Part Number

HLB35

General Information - Locknuts

Thread lock groove nut - groove nut - self-locking nut - square shaft nut with thread lock - hexagon shaft nut

Selection Details of - groove nut/shaft nut

- Material: stainless steel, steel

- Coatings: burnished, phosphate conversion coating

- Thread diameter (metric): M3 to M60

- Thread diameter (in inches): 0.391” to 12.562”

- Thread pitch (metric): fine thread, control thread

- Locking method: with adjusting screw, with clamping screw, with locking plate

- Drive form: grooves, hexagon, square

Description/Basics - groove nut/shaft nut

Groove nuts and shaft nuts are used to secure ball bearings and roller bearings to a shaft.
Using a shaft nut, a ball bearing can be clamped against a shoulder, for example on a rotary shaft. The inner ring of the bearing is thus firmly positioned on the shaft pin and the bearing is fully secured against axial displacement.

MISUMI offers various drive forms for shaft locknuts. The hexagon socket, which is the most common drive form for nuts in general, is also available for shaft nuts. This allows the locknut to be tightened and loosened without a complicated special tool.
The bearing lock nut with external hexagon can be secured by using either a set screw, a clamping set screw or a bearing lock nut. In the case of the locking plate, there must be a keyway in the shaft or in the shoulder of the shaft. The keyway ensures that the inner tab of the locking plate can lock into it. The outer tabs are turned over after tightening the shaft nut and thus secure the nut against loosening and at the same time against improper tightening.
In addition, there is also a bearing nut in square form. The anti-rotation lock is optionally done via an adjusting screw or a locking plate. The square serves as a drive and has a common wrench width.

In contrast to a shaft nut with a hexagon or square drive, a hook wrench was required to tighten nuts. The articles MISUMI offers are similar to those of DIN 981 for groove nuts and DIN 1810 for spanner wrenches.
The key is inserted with the hooks into the grooves of the shaft nut and moved clockwise or in the opposite direction. The lever rotates the thread of the nut on the thread of the shaft pin and the nut clamps or secures the bearing.

The size of the hook wrench is not based as usual on the width of a conventional nut. The underlying value here is the shaft diameter suitable for the nut (shaft Ø, see Table), which is referred to as number (for no., see Table) at MISUMI.
Thus, the hook wrench with the article number MFK16 is suitable for the shaft diameter 16 mm and 18 mm, which corresponds to a thread diameter of M8 or M10 respectively.

Another type of locking is the self-locking bearing nut. This variant of a bearing lock nut is a two-part nut. One half of the nut has an outer cone that fits into the inner cone of the second half. If the two halves of the nut are tensioned against each other, friction develops in the area of the cone, which inhibits self-loosening. This type of shaft nut is also driven by a hook wrench.
This type of bearing locking does not need a keyway compared to the locking plate, with the same number of assembly parts. As a result, the design requires less effort, which in turn reduces development costs and production costs.

Application Examples - Locknuts

Application example: groove nut ball bearing - rotary shaft

Application example: groove nut
(1) Ball bearing, (2) Shaft nut, (3) Rotary shaft

Application example: self-locking shaft nut - rotary shaft

Application example: self-locking shaft nut
(1) Upper part shaft nut, (2) Lower part shaft nut, (3) Rotary shaft

Industrial applications

3D printer industry

Automotive industry

Pharmaceutical industry

Packaging industry

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Part Number
HLB35
HLBC35
HLBM35
HLBS35
HLBU35

Standard Unit Price	Minimum order quantity	Volume Discount	Standard Shipping Days ?	RoHS	Thread Nominal M	Material	Surface Treatment
8.57 €	1	Available	5 Days	10	M35 x 1.5	[Steel] EN 1.0038 Equiv.	Surface Treatment Provided
19.15 €	1	Available	5 Days	10	M35 x 1.5	[Steel] EN 1.1191 Equiv. Thermal Refine	Surface Treatment Provided
19.01 €	1	Available	5 Days	10	M35 x 1.5	[Steel] EN 1.0038 Equiv.	Surface Treatment Provided
65.86 €	1	Available	5 Days	10	M35 x 1.5	EN 1.4301 Equiv.	No Surface Treatment
23.67 €	1	Available	Same day Stock	10	M35 x 1.5	[Steel] EN 1.1191 Equiv. Thermal Refine	Surface Treatment Provided

Back to the Category Groove Nuts/Shaft Nuts

Technical drawing - Locknuts

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Available dimensions and tolerances can be found under the tab More information.

Specification Tables - Locknuts

Part Number		MxPitch (Fine)	No. 1 Nut (Lower Nut)						No. 2 Nut (Upper Nut)							Common to No. 1 and 2		Setting Height ℓ				Perpendicularity of End Face (Max.)	Mass per Set (g)
Type	M		D₁	D₂	B		e		D₁	B´		e₁		b		S	T	Standard		Thin
					Standard	Thin	Standard	Thin		Standard	Thin	Standard	Thin	Standard	Thin			Min	Max	Min	Max		Standard	Thin
HLB (M10~50) HLBM (M12~50) HLBC (M10~50) HLBS (M12~50) HLBU (M25~50)	10	10x0.75	18	13	6	-	2.7	-	18	6	-	2.5	-	3.5	-	3	2.0	9.5	10.5	-	-	0.05	15	-
	12	12x1.0	22	17					22														17
	15	15x1.0	25	21	7				25	7				4.5		4		11.5	12.5				23
	17	17x1.0	28	24					28														29
	20	20x1.0	32	26	8				32	8				5.5				13.5	14.5				43
	25	25x1.5	38	32	10	7	4.2	3.7	38	10	7	4.0	4	6	3	5		16.0	17.5	10	11.5		72	45
	30	30x1.5	45	38					45														103	63
	35	35x1.5	52	44	11	8		4.2	52	11	8		4.0	7	4			18.0	19.5	12	13.5		150	100
	40	40x1.5	58	50	12	9			58	9	9			5	5	6	2.5	17.0	18.5	14	15.5		170	140
	45	45x1.5	65	56	13	10			65	10	10			6	6			19.0	20.5	16	17.5		240	201
	50	50x1.5	70	61	14	11			70	11	11			7	7			21.0	22.5	18	19.5		285	250

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Basic information

Type	Lock Nuts	Shape	Round Shape	Screw Type	Metric (Fine) Thread

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Basic Attributes

Material
- Steel
  - EN 1.0038 Equiv.
  - EN 1.1191 Equiv. Thermal Refine
- EN 1.4301 Equiv.
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Surface Treatment
- Surface Treatment Provided
- No Surface Treatment
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Type
- HLB
- HLBC
- HLBM
- HLBS
- HLBU
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Thread Nominal M
M10 x 0.75

M12x1

M15 x 1

M17x1

M20x1

M25x1.5

M30x1.5

M35 x 1.5

M40x1.5

M45x1.5

M50x1.5
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Optional Attributes

The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .

Frequently Asked Questions (FAQ)

Question:
Do I need a special tool for installing a nut?: Answer:
A hook spanner is required to install the nut. It is inserted with the hook into the groove of the shaft nut and thus prevents damage when tightening.
Question:
Is the size of the locknut wrenches comparable to that of wrenches?: Answer:
The size of the hook wrenches is specified in numbers (no.) at MISUMI. The information refers to the diameter of the shaft. One number always covers two shaft diameters. For details, see the Table below of this PDF.
Question:
How can I secure the shaft nut against twisting on the shaft with a keyway?: Answer:
A bearing lock nut can be secured to a shaft by means of a locking plate. However, a shaft with a keyway is more costly than a shaft without.
Question:
Is there a way to secure the shaft nut to the shaft without a keyway?: Answer:
With the help of a self-locking locknut, the bearing can also be secured without a keyway. Alternatively, a nut with adjusting screw can be used.