Spring Plungers
Ball Nose Spring Plunger for Fixture Positioning
A spring plunger with a ball nose contact point, presented for fixture positioning in custom mechanical assemblies.
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Standard components · Custom engineering · Repeat supply
Precision components,
standard and custom.
Standard plungers, pins and springs — plus custom CNC components developed from your drawing, sample or application requirements.
Standard ranges for fast selection · Custom support for drawings, samples and modified parts
15+
Years in precision manufacturing
2,400+
Component part numbers
30+
Countries shipped to
01 / Featured products
Explore plungers for your application
Browse representative Spring Plungers and Indexing Plungers. Share a drawing when you need a custom component reviewed around your assembly.
Spring Plungers
Custom Spring Plunger for Fixture Positioning
A spring plunger with a custom-engineered body and contact arrangement, presented for fixture positioning in custom mechanical assemblies.
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Spring Plungers
Press-Fit Spring Plunger for Assembly Alignment
A spring plunger with a smooth press-fit body, presented for assembly alignment in custom mechanical assemblies.
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Spring Plungers
Threaded Spring Plunger for Controlled Contact
A spring plunger with a threaded body, presented for controlled contact in custom mechanical assemblies.
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Indexing Plungers
Custom Indexing Plunger for Fixture Positioning
A indexing plunger with a custom-engineered body and locking arrangement, presented for fixture positioning in custom mechanical assemblies.
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Indexing Plungers
Locking Indexing Plunger for Guided Retention
A indexing plunger with a locking or rest-position mechanism, presented for guided retention in custom mechanical assemblies.
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Indexing Plungers
Standard Indexing Plunger for Jig and Fixture Builds
A indexing plunger with a indexing mechanism, presented for jig and fixture builds in custom mechanical assemblies.
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Indexing Plungers
T-Handle Indexing Plunger for Fixture Positioning
A indexing plunger with a manual T-handle or knob, presented for fixture positioning in custom mechanical assemblies.
View productSpring Plungers
Ball Nose Spring Plunger for Fixture Positioning
A spring plunger with a ball nose contact point, presented for fixture positioning in custom mechanical assemblies.
View productSpring Plungers
Custom Spring Plunger for Fixture Positioning
A spring plunger with a custom-engineered body and contact arrangement, presented for fixture positioning in custom mechanical assemblies.
View productSpring Plungers
Press-Fit Spring Plunger for Assembly Alignment
A spring plunger with a smooth press-fit body, presented for assembly alignment in custom mechanical assemblies.
View productSpring Plungers
Threaded Spring Plunger for Controlled Contact
A spring plunger with a threaded body, presented for controlled contact in custom mechanical assemblies.
View productSpring Plungers
Ball Nose Spring Plunger for Assembly Alignment
A spring plunger with a ball nose contact point, presented for assembly alignment in custom mechanical assemblies.
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Spring Plungers
Ball Nose Spring Plunger for Compact Mechanisms
A spring plunger with a ball nose contact point, presented for compact mechanisms in custom mechanical assemblies.
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Spring Plungers
Ball Nose Spring Plunger for Controlled Contact
A spring plunger with a ball nose contact point, presented for controlled contact in custom mechanical assemblies.
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Spring Plungers
Ball Nose Spring Plunger for Equipment Assembly
A spring plunger with a ball nose contact point, presented for equipment assembly in custom mechanical assemblies.
View productIndexing Plungers
Custom Indexing Plunger for Fixture Positioning
A indexing plunger with a custom-engineered body and locking arrangement, presented for fixture positioning in custom mechanical assemblies.
View productIndexing Plungers
Locking Indexing Plunger for Guided Retention
A indexing plunger with a locking or rest-position mechanism, presented for guided retention in custom mechanical assemblies.
View productIndexing Plungers
Standard Indexing Plunger for Jig and Fixture Builds
A indexing plunger with a indexing mechanism, presented for jig and fixture builds in custom mechanical assemblies.
View productIndexing Plungers
T-Handle Indexing Plunger for Fixture Positioning
A indexing plunger with a manual T-handle or knob, presented for fixture positioning in custom mechanical assemblies.
View product
Indexing Plungers
Custom Indexing Plunger for Assembly Alignment
A indexing plunger with a custom-engineered body and locking arrangement, presented for assembly alignment in custom mechanical assemblies.
View product
Indexing Plungers
Custom Indexing Plunger for Guided Retention
A indexing plunger with a custom-engineered body and locking arrangement, presented for guided retention in custom mechanical assemblies.
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Indexing Plungers
Custom Indexing Plunger for Repeatable Locating
A indexing plunger with a custom-engineered body and locking arrangement, presented for repeatable locating in custom mechanical assemblies.
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Indexing Plungers
Locking Indexing Plunger for Assembly Alignment
A indexing plunger with a locking or rest-position mechanism, presented for assembly alignment in custom mechanical assemblies.
View productTrusted by technical buyers:ISO-aligned processes · Drawing & NDA review · Material certificates · Prototype to production · Shipping to 30+ countries
02 / Custom engineering services
Custom components developed around your requirements
From drawing or sample review to prototype and repeat supply, we develop precision pins, plungers, springs and CNC parts around your application.
Four ways to start a custom project
Manufacturing from drawings
Share your drawing or 3D reference during the enquiry. We review key dimensions, materials and tolerances before production planning.
Sample-based development
Use an existing sample as a reference for dimensional review, drawing development and a new production proposal.
Modified standard components
Adapt thread, body length, nose type, spring force, material or marking while using a proven standard component as the starting point.
Prototype and small-batch support
Move from initial samples to small-batch production with specifications reviewed and agreed before repeat supply.
03 / Why buyers choose us
Why technical buyers choose masteryfastener
A practical combination of standard components, engineering support and dependable repeat supply.
Practical engineering review
We review requirements for material, tolerance, finish and manufacturability before preparing the next step.
Standard and custom support
Source standard plungers, pins and springs, or combine catalogue components with custom CNC parts for a more practical sourcing route.
Flexible specifications
Adjust dimensions, materials, spring loads, finishes or markings when a standard specification does not fit your application.
Quality aligned to specifications
First-article review, in-process checks and inspection records help keep repeat production aligned with approved specifications.
Prototype to repeat supply
Validate a custom or modified component in a prototype run, then plan repeat production around the approved specification.
Practical global delivery
Export coordination, shipment planning and documentation support for customers in Europe, North America and Asia.
04 / Manufacturing capabilities
Precision is a process, not a promise
The manufacturing and inspection capabilities behind our standard range and custom components.
Materials
Stainless steel, carbon steel, alloy steel, brass, aluminium and engineering plastics selected according to strength, corrosion resistance, wear and application requirements.
Machining processes
CNC turning, turn-milling, 3- and 4-axis machining, spring coiling and thread rolling for precision pins, plungers, springs and custom parts.
Tolerances
Tolerance requirements are reviewed against part geometry, material and function, with tighter control applied to critical features where required.
Spring force engineering
Load, travel and release behaviour reviewed against the mechanism, with force testing available where required.
Surface finishing
Black oxide, zinc and nickel plating, passivation, anodising, polishing and laser marking available through qualified finishing partners.
Inspection
Dimensional and functional checks using CMM, optical comparison, height gauges and thread gauges. Inspection records can be provided where required.
05 / How we work
From requirement to repeat supply
For custom and modified components, we provide a clear path from requirement review through sampling, approval and repeat production.
Step 1 — Share your requirement
Tell us about your part, application or sourcing requirement. Include key dimensions, materials, quantities and any available reference information.
Step 2 — Engineering review
We review dimensions, materials, tolerances, spring force and finishes, then highlight cost drivers and practical alternatives.
Step 3 — Quote and delivery planning
You receive a clear quotation covering part pricing, tooling or setup costs, minimum order quantities and estimated sample and production lead times.
Step 4 — Sample review and approval
Samples can be reviewed against the agreed specifications before you approve the design for production. Inspection records can be provided where required.
Step 5 — Production and repeat supply
Approved specifications are retained in the production record to support consistent repeat orders and future replenishment.
06 / Industries served
Built for mechanisms that demand consistency
Precision components for repeatable positioning, locking and controlled movement across demanding industrial applications.
Factory Automation
Indexing, clamping, tool changing and repeatable station location on production lines.
Automotive & EV
Assembly fixtures, welding jigs and inspection gauges for demanding production environments.
Medical Devices
Material and finish options for equipment operating in demanding clinical environments.
Electronics & Semiconductor
Compact, low-marking locating components for delicate handling and assembly.
Aerospace Support Equipment
Quick-release pins and precision machined parts for ground support and specialist equipment.
Machinery & Tooling
Custom locating pins, detents and precision turned parts for OEM machine builders.
07 / By the numbers
The numbers behind our work
A snapshot of our manufacturing experience, component coverage, global reach and delivery performance.
15+
Years in precision component manufacturing
2,400+
Standard and custom part configurations
30+
Countries served worldwide
98.6%
On-time delivery performance
08 / Customer feedback
Why engineering teams come back
Anonymous feedback from customers using our components in production equipment, fixtures and inspection systems.
" masteryfastener helped us consolidate spring plungers and machined housings with one supplier. Their drawing review also identified a thread callout issue before production. "
Mechanical Design Lead
Automation fixture programme · Germany
" The quotation included a clear explanation of how our original tolerance affected cost. The suggested alternative met the requirement and helped us avoid unnecessary machining expense. "
Sourcing Manager
Medical equipment OEM · United States
" We started with a small prototype run of custom indexing pins and later moved to repeat production. Each batch has been checked against the approved first article. "
Procurement Engineer
Inspection equipment supplier · Mexico
08 / Resources
Latest News
Engineering guides, product updates and practical manufacturing insights.
View All ResourcesSpring Plunger Selection Guide for Industrial Fixtures
Learn how to select a spring plunger for industrial fixtures by reviewing mounting space, contact style, force requirements and custom design inputs.
Read MoreCustom Plunger Enquiry Checklist: Drawings and Key Details
Prepare a clearer custom plunger enquiry with the drawings, installation dimensions, motion details and application information manufacturers need for review.
Read MoreHow to Choose an Indexing Plunger for Machine Design
A practical indexing plunger selection guide covering locating function, mounting geometry, pin engagement, operating access and custom machine design requirements.
Read More09 / Frequently asked
Questions engineers ask before they buy
If your question is not here, ask it directly in the RFQ form — a real engineer reads it.
Can you manufacture from my drawing or physical sample?
Yes. We can work from technical drawings, 3D files, sample photos or written specifications. If information is missing, our engineering team will identify the gap before quoting.
What products can you manufacture?
We supply spring plungers, ball plungers, indexing pins, ball lock pins, precision springs and custom CNC turned or milled parts.
Can you support both standard and custom parts?
Yes. We supply standard catalogue components and manufacture modified or fully custom parts based on drawings, samples or specifications.
What is your minimum order quantity?
MOQ depends on the product, material, tooling requirements and order volume. Prototype quantities may be possible for selected custom parts. Contact us with your requirement and we will recommend a practical starting quantity.
How quickly can you receive a quotation?
Standard products can usually be quoted within one working day. Custom parts may require additional engineering review before we confirm the quotation.
What are your typical lead times?
Lead time depends on the product, quantity, material, finishing and inspection requirements. We confirm the expected schedule before production and keep you informed if anything changes.
Which materials and finishes can you supply?
Common materials include stainless steel 303, 304 and 316, carbon steel, alloy steel, brass, aluminium and engineering plastics. Available finishes depend on the material and application.
Can you provide inspection and material documentation?
Inspection reports, dimensional reports and material documentation can be arranged according to the product and project requirements. Please specify the required documents in your RFQ.
Will you sign an NDA and protect my drawings?
We can review NDA requirements before sharing project information. Drawings and technical details are handled confidentially and are not used publicly without written permission.
How do you handle shipping and duties?
We discuss suitable shipping options based on order size, destination and urgency. Shipping terms and export documentation are confirmed with the quotation.
Still have questions about your part?
Request a QuoteRequest a quote
Looking for the right precision component?
Whether you need a standard component or a custom part, share your requirement and our team will help identify the right next step for quotation and production.
- Standard and custom component support
- Practical manufacturing guidance
- Response within 1 working day
Need a standard component or a custom part?
Tell us what you need and our engineering team will help identify the right next step for quotation, sampling or production.
Standard and custom RFQs welcome · Your project information is kept confidential