Bushings for Locating Pins Configurable, Straight

MISUMI

Product Overview

The fixture bushing is a mechanical positioning part that is used in conjunction with a positioning pin to achieve a guiding effect, in which the custom dimension, straight type offers a wide range of dimensions, easy to install. And it can effectively prevent the rapid wear of the workpiece.

Dimensional Drawing

The p7 type has a larger inner diameter shrinkage rate compared to the m7 type, so be careful when machining holes. (See Precautions for the inner diameter change after press-fit)

Specifications Overview

■Material Specification Table

Type		Material	Surface Treatment	Hardness
p7	m7	Material	Surface Treatment	Hardness
E-JBAFP	E-JBAF	Equivalent to 9CrWMn (Alloy Tool Steel or Bearing Steel)	-	55HRC~
E-JBAFBP	E-JBAFB	Equivalent to 9CrWMn (Alloy Tool Steel or Bearing Steel)	Ferroferric Oxide Protective Film	55HRC~
E-JBAFMP	E-JBAFM	Equivalent to 9CrWMn (Alloy Tool Steel or Bearing Steel)	Electroless Nickel Plating	55HRC~
E-JBAFSP	E-JBAFS	Austenitic stainless steel	-	45HRC~
E-JBAFCP	E-JBAFC	Martensitic stainless steel	-	50HRC~

If there are requirements for rust prevention, give priority to products with surface treatment of electroless nickel plating.

The I.D. tolerance of bushing is high. If a vernier caliper is used for detection, the measurement result will be too small. It is recommended to use a high-precision measuring tool (internal micrometer or plug gauge, etc.) for detection.

Specification Table

Part Number				P 0.01mm increments	L 0.01mm increments	Wall Thickness(N)
Type	D	D Tolerance
		p7	m7
(p7) E-JBAFP E-JBAFBP E-JBAFMP E-JBAFSP E-JBAFCP (m7) E-JBAF E-JBAFB E-JBAFM E-JBAFS E-JBAFC	5	+0.024 +0.012	+0.016 +0.004	2.00~2.50	5.0~6.0	1.25~1.50
	7	+0.030 +0.015	+0.021 +0.006	2.00~3.50	5.0~8.0	1.75~2.50
	8			3.00~4.50	5.0~13.0
	10			4.00~6.50	5.0~20.0	1.75~3.00
	12	+0.036 +0.018	+0.025 +0.007	6.00~8.50
	15			8.00~10.50	10.0~40.0	2.25~3.50
	18			10.00~12.50		2.75~4.00
	20	+0.043 +0.022	+0.029 +0.008	12.00~13.50		3.25~4.00
	22			12.00~13.50		4.25~5.00
	25			13.00~15.50		4.75~6.00
	26			15.00~16.50		4.75~5.50
	30			16.00~20.50	12.0~60.0	4.75~7.00
	35	+0.051 +0.026	+0.034 +0.009	20.00~25.00		5.00~7.50

When P≤3.59, L≤P×2.5 When P≥3.60, L≤P×3.0

Product Features

Features and usage outline of fixture bushing product Jig Bushings Straight Standard

Feature 1: straight, custom dimension type, press-fit installation, the tolerance of the O.D. press-fit dimension can be specified: p7, m7.
Feature 2: custom inner diameter, I.D. Dimension specified in 0.01mm increments, wide selection range
Feature 3: electroless nickel plated type can effectively prevent rust.
Feature 4: optional material: iron (alloy tool steel or bearing steel); austenitic stainless steel (martensitic stainless steel), suitable for locating pins made of various materials.

Precautions

①Dimensional tolerance and fit parameter table For details, click

Dimensional Tolerance Fit Table
②Change in inner diameter of the fixture bushing during press-fit
■Change in inner diameter of the fixture bushing during press-fit
The fixture bushing shrinks when press-fitted.
The shrinkage rate varies depending on material of mounting part and D dimension tolerance of bushing.

【Example of Shrinkage during Press-Fit】

Before press-fit

After press-fit

βDimension (when mounting hole is H7)

	D Dimension Tolerance
Mounting Material	m7	p7
Steel	αX99.93%	αX99.90%
Aluminum Alloy	αX99.96%	αX99.93%

③Reference table for common dimensions without indicated tolerance (medium accuracy m) For details, click

Table of Dimensions Without Indicated Tolerance

Example of Use

Example of using bushing for positioning pin and example of fixture

Example introduction: Positioning application of the relative position of the upper and lower plates of the fixture
Function description:
The position accuracy of the upper and lower plates of the fixture is ensured by the coordinated use of positioning pins and bushings.
Advantages of fixture bushings:
①The bushing hardness is slightly lower than the positioning pin, which effectively protects the positioning pin from rapid wear and ensures the positioning accuracy.
②The bushing is easy to replace when it wears out, effectively protecting the bottom plate or workpiece from damage.

Application Industries

Lithium battery	Smart Phones	Electronic & Electrical

Semiconductor	Medical	Food

Locating Pins Large Head, Tapered, Press Fit, Standard	Locating Pins Straight, Cone Head	Fixture Bushings Shouldered, Standard

Representative model: JPBB6-10	Representative model: CUM6-15	Representative model: JBH5-8
Advantages: suitable for various working conditions, widely used	Advantages: affordable price, easy to install	Advantages: easy to install, rich in specifications