Bushings for Locating Pins Round Flanged

Brand :

MISUMI

Caution

Product Description

Product Overview

The locating pin bushing is a mechanical positioning component used together with a locating pin to provide guidance. The round flange type can be fixed with bolts, making installation convenient and providing high fastening strength (prevents loosening), which effectively prevents rapid wear of the workpiece.

Dimensional Drawing

Material Specifications

Type			Fixed P Dimension		Customizable P Dimension		Surface treatment
Fixed P Dimension, selectable L Dimension	Custom P Dimension, L Dimension		Material	Hardness	Material	Hardness
Fixed at 4 points	Fixed at 4 points	Fixed at 3 points	Material	Hardness	Material	Hardness
E-JBY	E-JBYF	E-JBTF	Equivalent to SUJ2	Quenched hardness 58 HRC or more	Equivalent to 9CrWMn (alloy tool steel or bearing steel)	Quenched hardness 56–60 HRC	—
—	E-JBYFB	—					Magnetite protective film
E-JBYM	E-JBYFM	E-JBTFM					Electroless nickel plating
E-JBYS	E-JBYFS	—	Austenitic stainless steel	—	Austenitic stainless steel	—	—
—	E-JBYFC	—	—	—	Martensitic stainless steel	Quenched hardness 50 HRC or more	—

If rust prevention is required, please give priority to products with electroless nickel plating surface treatment or made of austenitic stainless steel materials.

Since the wall thickness of the countersunk hole is only about 1.5 mm and the product has high hardness, please make sure the flange edge is fully in contact with the mounting surface before tightening the bolts. Otherwise, there is a risk of the countersunk hole cracking.

The bushing inner diameter tolerance is highly precise. If a vernier caliper is used for measurement, it may result in a smaller reading. It is recommended to use high-precision measuring instruments (such as an inside micrometer or plug gauge) for inspection.

Specification Table

■ P dimension fixed · L dimension selectable type

Type		Length L selection									R	H	T	Outer Diameter D_g7		A	d	d₁	h
Type	Inner Diameter P
Round · 4-point fixation E-JBY E-JBYM E-JBYS	5	8	10	12	16						1	25	5	10	-0.005 -0.020	17	3.3	6.5	3.5
	6
	8		10	12	16	20					2	28		12	-0.006 -0.024	20
	10											36	6	15		26	4.5	8	4.5
	12			12	16	20	25	30						18
	13											40		22	-0.007 -0.028	30
	15											44		25		34
	16				16	20	25	30	35					26
	20										3	56	8	30		42	6.6	11	6.5
	25					20	25	30	35	40		60		35	-0.009 -0.034	46

■ P size / L size freely specified type

Type			Inner Diameter P Specified unit: 0.01 mm	Length L Specified unit: 0.1 mm	R	H	T	A	d	d₁	h
Type	Outer Diameter D_g7
Round · 4-point fixation E-JBYF E-JBYFB E-JBYFM E-JBYFS JBYFC Round · 3-point fixation E-JBTF E-JBTFM	10	-0.005 -0.020	4.00–6.50	5.0–15.0	1	25	5	17	3.3	6.5	3.5
	12	-0.006 -0.024	6.00–8.50		2	28		20
	15		8.00–10.50	10.0–35.0		36	6	26	4.5	8	4.5
	18		10.00–12.50
	20	-0.007 -0.028	12.00–13.50			40		30
	22		12.00–13.50
	25		13.00–15.50			44		34
	26		15.00 to 16.50
	30		16.00 to 20.50	12.0 to 50.0	3	56	8	42	6.6	11	6.5
	35	-0.009 -0.034	20.00–25.00			60		46

L+T ≤ P × 3.0

Product Features

Feature 1: Round flange type, fixed with bolts after press-fitting, providing high fastening strength.
Feature 2: Available in electroless nickel plating and stainless steel specifications for effective rust prevention.
Feature 3: Optional materials: iron (alloy tool steel or bearing steel); austenitic stainless steel (martensitic stainless steel); austenitic stainless steel, suitable for locating pins of various materials.

Precautions

(1) Dimensional tolerance and fit parameter table.
(2) Change in inner diameter when pressing in the fixture bushing
■ Change in inner diameter when pressing in the fixture bushing
The fixture bushing will shrink when pressed in.
The amount of shrinkage varies depending on the material of the mounting part and the D dimension tolerance of the bushing.

[Example of shrinkage during press-fitting]

Before press-fitting

After press-fitting

β dimension (when mounting hole is H7)

	D dimension tolerance
Mounting material	m7	p7
Steel	αX99.93%	αX99.90%
Aluminum alloy	αX99.96%	αX99.93%

(3) Reference table for general dimensions without specified tolerances (medium precision m).

Example of Use

Use Cases of Locating Pin Bushings and Jig Examples

Case Introduction: Application of Flanged Locating Pin Bushings in Fixtures
Function Description and Precautions:
The fixture plate requires positioning accuracy during operation, so bushings are designed to be used together with locating pins to ensure positioning accuracy. Since the jig plate is easily impacted during operation, bushings are fixed with bolts, and counterbore machining is performed in areas with limited space.
Advantages of flange-type fixture bushings:
(1) The hardness of the bushing is slightly lower than that of the locating pin, which effectively protects the locating pin from rapid wear while ensuring positioning accuracy.
(2) The bushing is easy to replace after wear, effectively protecting the base plate or workpiece from damage.
(3) The bushing can be fixed with bolts to ensure that it does not fall off or rotate during actual operation.

Application Industries

Lithium batteries	Smartphones	Electronics and Electrical Appliances

Semiconductors	Medical	Food

Locating Pins Large Head, Tapered, Press Fit, Standard	(Economy Series) Locating Pins Straight, Cone Head	Fixture Bushings Shouldered, Standard

Representative Model: JPBB6-10	Representative Model: CUM6-15	Representative Model: JBH5-8
Advantage: Standard shape, widely used	Advantage: Economical price	Advantage: Standard specifications