Sprockets Nominal No.25

Brand :

MISUMI

Caution

Product Description

Product Overview of Sprockets

■ Sprockets is a solid or spoked gear that engages with a roller chain to transfer motion or power.
Application of Sprockets: It is widely used in mechanical transmission in chemical industry, textile machinery, food processing, instrumentation,and petroleum
■ Only Sprockets and chains of the same specifications can be used in combination.
This series is ANSI 25 Sprockets, and can be used in combination with our 25 series chain.
■ Do not use it with ISO/ANSI B Series chain, which may cause the chain Sprockets mechanism to fail to function properly!
■ Due to process reasons, it is impossible to guarantee the coincidence of the tooth tops of multiple Sprockets. If you need to use the tooth tops in an overlapping manner, please contact us.
Actual Product

Product Feature of Sprockets

■ Sprockets chain drive has the following features compared with gear drive and belt drive:
1. Sprockets, safe and reliable;
2. Sprockets, Flexible transmission, absorbing shock and vibration;
3. Sprockets, Large center distance range, low manufacturing and mounting accuracy requirements;
4. Sprockets, Compared with belt drive, the transmission ratio is accurate and the transmission efficiency is higher, suitable for high temperature，dusty and humid environments.

■ Sprockets, chain selection
Misumi’s Sprockets and chain product selection supports the principle of “Nominal Numbering”

Dimensional Drawing of Sprockets

Product Drawings (Unit: mm)
Sprockets 25B: related images

Type	Material	Accessories
C-SP25B	Equivalent to S45C	Fixing Screw (Only Shaft Hole Specifications N)

※ This series is 04C Japanese Standard Sprockets, and can not be used in combination with Chinese Standard 04B series Sprockets.
■ A single package label may not match the ordered model. It is a factory-managed model. Please note that the outer package label shall prevail!
■ The engraving of Sprockets body may be different from the ordered model, please check the engraving number.

Usage Method of Sprockets

How to mount the Sprockets (A) Axis configuration ■ Horizontal Even when the two axes are arranged horizontally, the rotation direction of the axis must be considered. The examples (2) and (3) in the figure show that when the chain is stretched, the disengagement between the Sprockets teeth and the chain is not smooth and may bite. In particular, the upper and lower chains in (3) will contact each other, so an idler is required.
■ Vertical If the chain is stretched, slack as shown in (5) will occur, and when a small Sprockets is used on the lower side, the chain may fall off. Therefore, please use it at an angle of 60 or less as shown in (4). When it is necessary to use it vertically due to the mechanism or space, it is recommended to put the large Sprockets on the lower side, and use the idler on the outside or inside as shown in (6).
(B) Deflection Deflection is generally about 4% of the shaft spacing, and about 2% in the following cases. a. Vertical transmission or close to vertical transmission b. Shaft spacing is more than 1m c. When frequent heavy load starting and stopping are required d. When reverse rotation is required
(C) When the load changes If a tension adjuster is mounted on the tension side or slack side of the chain to provide initial tension in advance, it will eliminate vibration and reduce noise during operation.

Example Use of Sprockets

Used for driving power A mechanism that can convert motor power into roller rotation by combining multiple Sprockets and chains
Used for transporting workpieces A chain conveyor frame with high versatility using flat profiles and chain guides
Used for transporting workpieces A mechanism used to mount accessories on the chain, and extract and transport workpieces

Precautions of Sprockets

■ Sprockets maintenance
1. Sprockets tightness should be suitable. If it is too tight, it will increase power consumption, and bearing is easy to wear; if it is too loose, the Sprockets is easy to runout and fall off the chain.
The degree of tightness of the Sprockets is: if lifted up or pressed down from the middle of the Sprockets, the center distance between the two Sprockets is about 2%-3%.

2. The Sprockets shall be installed on shaft without swing and skew.
The end faces of the two Sprockets in the same transmission assembly should be in the same plane. When the center distance of the Sprockets is less than 0.5 meters, the deviation can be 1 mm.
When the center distance of the Sprockets is more than 0.5 meters, the deviation can be 2 mm. But there shall be no friction on Sprockets tooth side. Integral offset.
If the offset is too large, chain is prone to fall off and wear is likely to accelerate. When replacing the Sprockets, you must pay attention to check and adjust the offset

3. After the Sprockets is severely worn, the new Sprockets and the new chain should be replaced at the same time to ensure good meshing.
You cannot replace new Sprockets separately. Otherwise, it will cause bad engagement and accelerate the wear of new Sprockets.
If the tooth surface of the Sprockets is worn to a certain degree, it should be turned over in time (the Sprockets used with adjustable surface) to extend the life time.

4. If the new Sprockets is too long or elongated after use, and difficult to adjust, the links can be removed by the case, but the number of the links must be even.
The link should pass through the back of the Sprockets with the lock piece being inserted outside, and the opening of the lock piece should be in the opposite direction of the turning.

5. Lubricating oil should be timely filled when Sprockets are working. Lubricating oil must enter the matching clearance between the roller and the inner sleeve to improve working conditions and reduce wear.

6. The old Sprockets cannot be mixed with some of the new Sprockets, and should be replaced as a complete set, otherwise it is easy to produce impact in the transmission. Separate replacement of Sprockets will increase wear.

Specification Table of Sprockets

Nominal model	Hub type	Number of Teeth	Shaft Hole Specifications	Shaft Hole Diameter (D)				Dp	D₀	H	L	ℓ
Nominal model	Hub type	Number of Teeth	Shaft Hole Specifications	S Specifications	N Specifications (H7)			Dp	D₀	H	L	ℓ
25	B	16	S N	9	10	12		32.55	36	25	15	6
		17		9	10	12		34.56	38
		18		9		12		36.57	40
		19		9		12		38.58	42	28
		20		9	10			40.59	44
		21		9				42.61	46
		22		9			15	44.62	48	30
		25		9		12	15	50.66	54	35
		32		10＊				64.78	68	40	20	8
		35		10				70.84	74	40	20	8

If 10K is selected, the shaft hole diameter is φ10 and the keyway width is 4mm (height 1.8mm).

Shaft Hole Machining Size Table

Shaft Hole Diameter D	Keyway b₂×t₂	Fixing Screw M
10	3×1.4	4
10K··12	4×1.8	5
15·16	5×2.3	6
20	6×2.8	6