Carbon Steel Indexing Plungers – Blackened Lock-Out Type

Carbon Steel Indexing Plungers – Blackened Lock-Out Type

Blackened Carbon Steel Body | Lock-Out Mechanism | M6, M8 & M10 | OEM Industrial Positioning Components

Juxin Fasteners supplies blackened carbon steel indexing plungers with lock-out mechanisms for industrial machinery, automated manufacturing equipment, assembly fixtures and adjustable mechanical positioning systems.

These spring-loaded indexing plungers feature a carbon steel threaded body with a blackened surface finish and a manually operated retractable locating pin.

The lock-out mechanism allows the locating pin to remain in its retracted position during equipment adjustment, fixture changeovers and mechanical repositioning.

Unlike non-lock-out spring-return indexing plungers, lock-out models allow operators to keep the locating pin withdrawn without continuously holding the operating knob.

Designed for machinery manufacturers, mechanical engineers, production managers and industrial procurement teams, these indexing plungers support efficient equipment setup, repeatable positioning and OEM engineering requirements.

Product Specifications – Featured Lock-Out Model

The exact knob material, pin material, spring material, thread pitch, pin diameter, stroke, spring force and dimensional tolerances should be confirmed against the selected technical drawing.

How Does a Lock-Out Indexing Plunger Work?

A lock-out indexing plunger combines a spring-loaded locating pin with a retaining mechanism that allows the pin to remain retracted during equipment adjustment.

Typical Operating Sequence

1. Engaged Position: The spring-loaded locating pin extends into a compatible locating hole or positioning feature.

2. Manual Retraction: The operator pulls the knob to withdraw the locating pin.

3. Lock-Out Engagement: The operator engages the retaining mechanism to hold the pin in its retracted position.

4. Equipment Adjustment: The fixture, bracket or machine component can be repositioned without continuously holding the knob.

5. Lock-Out Release: The operator disengages the locking mechanism.

6. Spring Return: The internal spring drives the pin toward its extended position, allowing re-engagement when the mating hole is aligned.

Many conventional pull-and-twist lock-out indexing plungers use a 90-degree knob rotation and a retaining notch.

The exact operating procedure must be verified against the selected product design.

Key Product Features

Blackened Carbon Steel Body

The carbon steel threaded body provides a practical mounting structure for industrial machinery, positioning fixtures and adjustable mechanical assemblies.

The blackened surface finish provides a dark appearance and may offer limited corrosion protection depending on the treatment process and supplementary protective coating.

Blackening should not be assumed to provide the same corrosion resistance as stainless steel or specialized protective plating systems.

For applications requiring specific corrosion performance, the blackening process and supplementary protection should be confirmed.

Lock-Out / Rest-Position Mechanism

The locking mechanism allows the locating pin to remain retracted during machine adjustments and fixture changeovers.

This is particularly useful when operators need both hands to reposition components or replace tooling.

Spring-Loaded Locating Pin

The internal spring provides the restoring force required to extend the locating pin after the lock-out mechanism is released.

Manual Pull-Knob Operation

The operating knob provides a convenient interface for retracting and controlling the locating pin.

Threaded Mounting Design

The externally threaded body allows installation into a compatible threaded mounting hole or suitable mounting component.

M6, M8 and M10 Configurations

Multiple nominal mounting thread sizes allow engineers to select suitable components according to available installation space and mechanical assembly requirements.

OEM Customization

Juxin Fasteners supports drawing-based evaluation of custom threads, locating pin dimensions, stroke requirements, materials and other engineering specifications.

Blackened Steel Lock-Out vs. Non-Lock-Out Indexing Plungers

The featured product on this page is the blackened carbon steel lock-out version.

Blackened Steel vs. Nickel-Plated Steel Indexing Plungers

Both product families can use carbon steel threaded bodies, but their surface treatments differ.

The appropriate surface finish should be selected according to the equipment environment, customer specifications and engineering requirements.

Available Indexing Plunger Types and Sizes

In addition to the featured blackened carbon steel lock-out model, Juxin Fasteners offers a broad range of indexing plungers for industrial positioning applications.

The following portfolio includes 40 listed configurations across seven material and structural groups.

1. Ultra-Miniature Stainless Steel Indexing Plungers

Compact stainless steel indexing plungers for miniature positioning mechanisms and space-constrained mechanical assemblies.

Lock-Out Type

• M5 × 0.8

• M5 × 0.5 – Fine Thread

Non-Lock-Out / Spring-Return Type

• M5 × 0.8

• M5 × 0.5 – Fine Thread

2. All-Stainless-Steel Indexing Plungers – Standard Metric Threads

All-stainless-steel configurations for industrial machinery and positioning systems requiring stainless steel construction.

Non-Lock-Out / Spring-Return Type

• M6

• M8

• M10

Lock-Out / Rest-Position Type

• M6

• M8

• M10

3. All-Stainless-Steel Indexing Plungers – Fine Metric Threads

Fine-thread stainless steel indexing plungers for specialized mounting and positioning requirements.

Non-Lock-Out / Spring-Return Type

• M6 × 0.75

• M8 × 1.0

• M10 × 1.0

Lock-Out / Rest-Position Type

• M6 × 0.75

• M8 × 1.0

• M10 × 1.0

4. Carbon Steel Indexing Plungers

Carbon steel indexing plungers for industrial machinery, production fixtures and adjustable mechanical assemblies.

Non-Lock-Out / Spring-Return Type

• M6

• M8

• M10

Lock-Out / Rest-Position Type

• M6

• M8

• M10

The featured blackened carbon steel indexing plunger belongs to the lock-out category.

5. Stainless Steel Indexing Plungers with Plastic Base – Standard Metric Threads

Combined stainless steel and plastic-base configurations for specific industrial positioning and mounting requirements.

Non-Lock-Out / Spring-Return Type

• M6

• M8

• M10

Lock-Out / Rest-Position Type

• M6

• M8

• M10

6. Nickel-Plated Carbon Steel Indexing Plungers

Nickel-plated carbon steel configurations for industrial machinery, positioning systems and adjustable fixtures.

Non-Lock-Out / Spring-Return Type

• M6

• M8

• M10

Lock-Out / Rest-Position Type

• M6

• M8

• M10

7. Stainless Steel Indexing Plungers with Plastic Base – Fine Metric Threads

Fine-thread stainless steel and plastic-base configurations for specialized mechanical assemblies.

Non-Lock-Out / Spring-Return Type

• M6 × 0.75

• M8 × 1.0

• M10 × 1.0

Lock-Out / Rest-Position Type

• M6 × 0.75

• M8 × 1.0

• M10 × 1.0

Metric Thread Selection Guide

The following standard metric coarse-thread pitches are provided as engineering references.

Fine-Thread Options Across the Product Range

• M5 × 0.5

• M6 × 0.75

• M8 × 1.0

• M10 × 1.0

Thread availability depends on the selected product family and operating configuration.

The standard coarse-thread pitches shown above are reference values and should not be assumed for every individual model without checking the corresponding drawing.

Metric-to-Inch Diameter Reference

These conversions represent nominal metric thread diameters only.

Metric and UNC/UNF threads are not directly interchangeable. Custom inch-thread configurations require separate engineering evaluation.

Engineering Selection Guide for Lock-Out Indexing Plungers

1. Mounting Thread Diameter and Pitch

Verify the external mounting thread diameter, pitch, thread engagement length and mating threaded component.

Correct thread compatibility is essential for secure installation.

2. Locating Pin Diameter

The locating pin must be compatible with the mating locating hole or positioning feature.

Pin-to-hole clearance and dimensional tolerances influence positioning repeatability and mechanical fit.

3. Retraction Stroke

The locating pin must retract sufficiently to disengage the mating component during equipment adjustment.

The required stroke should be verified against the machine assembly design.

4. Spring Force

Spring force influences manual operating effort and the restoring force available when the lock-out mechanism is released.

Initial and final spring-load values should be confirmed against the selected technical specification.

5. Lock-Out Retention

The retaining mechanism must maintain the pin in its retracted position under the intended operating conditions.

Repeated operation, vibration exposure and potential unintended release should be considered during equipment design.

6. Blackened Surface Finish

Blackening provides a dark surface appearance, but corrosion performance depends on the actual process and supplementary protection.

For applications involving moisture, outdoor exposure or aggressive cleaning chemicals, alternative materials or finishes may be required.

7. Installation and Retention

Engineers should evaluate mounting thread engagement, installation accessibility, tightening requirements and any additional retention components.

8. Mechanical Loads and Safety

Indexing plungers are primarily positioning components.

Their suitability for shear loads, impact, vibration or safety-related functions must be confirmed through application-specific engineering evaluation.

They should not be assumed to provide a certified safety interlock or structural load-bearing function.

Industrial Applications

Industrial Automation and Machine Building

Lock-out indexing plungers support adjustable machine components, manual positioning systems and equipment setup mechanisms.

The lock-out function allows the locating pin to remain withdrawn while operators reposition an assembly.

Jigs, Fixtures and Quick-Change Tooling

Manufacturing fixtures often require temporary disengagement of locating pins during tooling changes.

Lock-out indexing plungers allow operators to hold the pin retracted without continuous manual effort.

CNC Machinery and Machine Tools

These components may be used in adjustable machine accessories, auxiliary positioning mechanisms and fixture assemblies.

The selected design should be evaluated for installation dimensions, operating loads and vibration conditions.

Automotive and EV Manufacturing Equipment

Automotive production fixtures, assembly tooling and equipment changeover mechanisms can use lock-out indexing plungers for mechanical positioning.

The retained retraction function is useful during manual fixture adjustment and tooling replacement.

Packaging Machinery

Adjustable guide rails, positioning brackets and equipment changeover assemblies may incorporate lock-out indexing plungers.

Electrical Equipment Manufacturing

Lock-out indexing plungers can support mechanical positioning in industrial electrical equipment assembly fixtures and production tooling.

Electronics and Semiconductor Equipment Manufacturing

Selected indexing plungers may be used in adjustable mechanical fixtures, equipment positioning assemblies and non-process-critical machine components.

Material cleanliness, dimensional accuracy and operating conditions should be evaluated for specialized applications.

Benefits for OEM Engineers, Production Managers and Procurement Teams

For Mechanical and Design Engineers

• Lock-out positioning mechanism

• Standard metric mounting thread options

• Carbon steel construction

• Blackened surface finish

• Drawing-based dimensional evaluation

• Custom engineering options

For Production Managers

• Hands-free pin retraction during fixture adjustments

• Convenient equipment setup

• Support for tooling changeovers

• Repeatable mechanical positioning

• Reduced need to continuously hold the operating knob

For Industrial Procurement and Supply Chain Teams

• Standard and custom indexing plunger sourcing

• Multiple material and finish options

• OEM engineering support

• Industrial batch supply

• Technical documentation review

• RoHS and REACH documentation support

OEM Manufacturing and Custom Indexing Plunger Solutions

With more than 20 years of industrial fastener manufacturing experience, 

Juxin Fasteners supports international OEM customers and industrial equipment manufacturers with standard and custom-engineered mechanical components.

Our team can evaluate customer requirements for:

• Carbon steel and stainless steel materials

• Blackened and nickel-plated surface finishes

• Standard metric mounting threads

• Fine-thread configurations

• Custom locating pin diameters

• Modified pin lengths and retraction strokes

• Spring-force requirements

• Knob configurations

• Lock-out and non-lock-out mechanisms

• Drawing-specific dimensional tolerances

• OEM part-number identification

• Industrial production quantities

Custom manufacturing feasibility, material requirements, inspection specifications and delivery schedules are reviewed according to each project.

Quality Control and Technical Documentation

Juxin Fasteners supports engineering and procurement teams requiring product specifications, dimensional inspection requirements and material documentation.

Our company maintains RoHS and REACH compliance documentation.

Product-specific documentation can be reviewed according to the applicable materials, surface finishes and customer requirements.

Customers are encouraged to provide 2D drawings, 3D CAD models or detailed technical specifications for engineering evaluation.

Frequently Asked Questions

What is a lock-out indexing plunger?

A lock-out indexing plunger is a spring-loaded mechanical positioning component with a retaining mechanism that allows the locating pin to remain in its retracted position.

How does a lock-out indexing plunger differ from a spring-return model?

A lock-out model can retain the locating pin in its retracted position when the locking mechanism is engaged.

 A non-lock-out spring-return model automatically extends toward its normal position when the knob is released.

What is the surface finish of this carbon steel indexing plunger?

The featured product has a blackened carbon steel body. 

The exact blackening process and corrosion-performance requirements should be confirmed according to the application.

What sizes are available?

The featured carbon steel lock-out range includes M6, M8 and M10 nominal mounting thread sizes.

Can the indexing plunger remain retracted without holding the knob?

Yes. The lock-out mechanism is designed to retain the locating pin in its retracted position until the locking mechanism is released.

Are nickel-plated steel indexing plungers available?

Yes. Juxin Fasteners also supplies nickel-plated carbon steel indexing plungers in lock-out and non-lock-out configurations.

Do you offer stainless steel indexing plungers?

Yes. Our wider range includes stainless steel, all-stainless-steel, ultra-miniature and stainless steel with plastic-base configurations.

Can indexing plungers be customized for OEM machinery?

Yes. We support engineering evaluation of custom threads, locating pin dimensions, spring-force requirements, materials, surface finishes and other drawing-based specifications.

Can I request 2D drawings, 3D models or samples?

Please provide the required product configuration and technical specifications. Our team can review drawing availability, CAD requirements, sample options and quotation details.

Request a Quotation – Blackened Carbon Steel Lock-Out Indexing Plungers

Looking for a manufacturer of blackened carbon steel lock-out indexing plungers for industrial machinery, automation systems, manufacturing fixtures or OEM equipment?

Juxin Fasteners supplies spring-loaded indexing plungers in carbon steel, nickel-plated steel, stainless steel and other material configurations.

We support international OEM customers requiring standard products, custom engineering solutions and industrial batch supply.

Please Include the Following Information in Your RFQ:

• Required indexing plunger type

• Lock-out or non-lock-out operation

• Mounting thread diameter and pitch

• Locating pin diameter and retraction stroke

• Body and pin material requirements

• Surface finish specifications

• Spring-force requirements

• 2D drawings or 3D CAD models, if available

• Estimated annual usage and order quantity

• Required delivery destination

Juxin Fasteners – Precision Fastener Manufacturer

Email: info@juxinfasteners.com

Website: https://www.juxinfasteners.com/

Carbon Steel Indexing Plungers | Blackened Steel | Lock-Out Positioning Pins | OEM Custom Manufacturing

Packaging Standard

At Juxin Fasteners, we apply standardized export packaging to ensure product protection, traceability, and compliance with international logistics requirements.

1. Standard Export Packaging

Unless otherwise specified, all products will be packed according to our factory standard export packaging, which includes:

Moisture-resistant inner protection

Poly bag or small box packing as required

Reinforced export cartons

Clear labeling with part number, specification, batch number, and quantity

Palletizing for sea or air shipment when necessary

Our standard packaging is designed to ensure safe transportation, efficient warehousing, and long-distance international shipping.

2. Customized Packaging Options

We also provide customized packaging solutions according to customer requirements, including but not limited to:

Private labeling

Customized barcodes

Specific carton dimensions

Retail packaging

Special pallet configuration

Customer-specific marking and identification

So that you know, customized packaging may involve additional costs and extended lead time depending on the complexity of the requirements.

3. Compliance & Quality Assurance

All packaging processes are controlled under our ISO 9001 quality management system to ensure consistency, traceability, and product integrity throughout the supply chain.