Stem/Rod: Diameter 3-25 mm, Length 50-500 mm

Component Specifications

Definition

A critical cylindrical component in float assemblies that transmits mechanical motion from the float to control mechanisms, typically featuring precision machining, corrosion-resistant materials, and specific dimensional tolerances for reliable operation in fluid level control applications.

Working Principle

Converts buoyant force from the float into linear mechanical motion through direct connection, transmitting position changes to control valves or switches to regulate fluid levels based on displacement principles.

Materials

Stainless steel (AISI 304/316), brass (C36000), or carbon steel with protective coatings; hardness: 150-250 HB; surface finish: Ra 0.8-1.6 μm.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	50-500 mm
Diameter	3-25 mm
Thread Type	M6-M20 metric or equivalent UNF
Pressure Rating	Up to 25 bar
Operating Temperature	-20°C to 150°C
Straightness Tolerance	0.05 mm/100 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 286-2, DIN 7150, ASME B1.13M

Parent Products

This component is used in the following industrial products

Float Assembly

A mechanical assembly containing a buoyant float that moves with liquid level changes in a tank or vessel.

View Product Details

Float Switch

A liquid level sensor that uses a buoyant float to actuate an electrical switch.

View Product Details

Engineering Analysis

Risks & Mitigation

Corrosion in aggressive fluids
Bending under excessive load
Thread wear leading to inaccurate positioning
Galvanic corrosion in mixed-material assemblies

FMEA Triads

Trigger: Material fatigue from cyclic loading
Failure: Fracture or permanent deformation
Mitigation: Implement regular inspection schedules and use materials with higher fatigue strength

Trigger: Inadequate corrosion protection
Failure: Pitting and reduced structural integrity
Mitigation: Apply appropriate coatings and select corrosion-resistant alloys for specific environments

Trigger: Improper alignment during installation
Failure: Binding and premature wear
Mitigation: Use alignment fixtures and verify straightness during assembly

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05mm diameter, ±0.1mm length for standard applications

Test Method

Dimensional verification per ISO 2768-m, material certification per EN 10204 3.1, pressure testing per ISO 5208

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Stem/Rod

Manufacturer profiles associated with Stem/Rod.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What materials are best for corrosive environments?

AISI 316 stainless steel provides optimal corrosion resistance for harsh chemical or marine applications.

How do I determine the correct stem length?

Measure from the float connection point to the control mechanism interface, adding 10-15mm for adjustment tolerance.

What maintenance is required?

Regular inspection for corrosion, straightness verification, and lubrication of threaded connections every 6-12 months.

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.

Stem/Rod