Guide Posts/Bushings: Diameter Tolerance ±0.002 mm

Component Specifications

Definition

Guide posts and bushings are critical components in precision tooling systems, particularly in die and punch applications. They consist of hardened cylindrical posts that fit into corresponding bushings to maintain precise alignment between the upper and lower sections of a tool or die set. These components prevent lateral movement, reduce wear on cutting edges, and ensure consistent part quality by controlling the parallelism and perpendicularity of tool movements during stamping, punching, or forming operations.

Working Principle

Guide posts slide into bushings with minimal clearance, creating a precise mechanical interface that restricts radial movement while allowing axial motion. The hardened surfaces and lubrication grooves reduce friction and wear, while the tight tolerances maintain alignment accuracy throughout the tool's operational life. The system operates on the principle of precision cylindrical guidance, where the post-bushing interface controls all degrees of freedom except the intended linear motion.

Materials

Typically made from high-carbon tool steels (A2, D2, O1), case-hardened steels, or carbide for extreme wear applications. Bushings often incorporate bronze alloys or polymer composites for self-lubricating properties. Surface hardness ranges from 58-65 HRC for steel components.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	60-62 HRC
Straightness	0.01 mm/100 mm
Clearance Fit	H7/g6 or H7/f7
Concentricity	0.005 mm TIR
Surface Finish	0.2-0.4 μm Ra
Diameter Tolerance	±0.002 mm

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 286, DIN 1494, JIS B 0401

Parent Products

This component is used in the following industrial products

Precision Tooling (Die & Punch)

Specialized tooling components used for cutting, forming, or shaping materials in precision pressing operations

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Engineering Analysis

Risks & Mitigation

Misalignment causing tool damage
Wear leading to dimensional inaccuracy
Gallting or seizing without proper lubrication
Fatigue failure under cyclic loading

FMEA Triads

Trigger: Insufficient lubrication
Failure: Increased friction and wear, potential seizure
Mitigation: Implement automatic lubrication systems, use self-lubricating bushing materials, establish regular maintenance schedules

Trigger: Contamination from metal particles
Failure: Abrasive wear, scoring of surfaces
Mitigation: Install protective bellows or covers, implement regular cleaning protocols, use filtration in lubrication systems

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

ISO IT6-IT7 grade for diameter, straightness within 0.01mm per 100mm length

Test Method

CMM measurement for dimensional accuracy, surface roughness testing, hardness testing per Rockwell C scale, functional testing in assembly

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Guide Posts/Bushings

Manufacturer profiles associated with Guide Posts/Bushings.

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Frequently Asked Questions

What is the difference between guide posts and guide bushings?

Guide posts are the male cylindrical components that provide the guiding surface, while bushings are the female components that receive the posts. Together they form a precision sliding pair that maintains alignment in tooling systems.

How often should guide posts and bushings be maintained?

Regular inspection every 50,000-100,000 cycles with lubrication at each tool change. Complete replacement typically occurs after 500,000-1,000,000 cycles depending on material and operating conditions.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Guide Posts/Bushings