Precision Glass Level Vials 1″–90′ — GOST 2386-73 & Custom OEM

UKRPRIBOR manufactures precision borosilicate glass level vials with nominal division values from 1 arc second to 90 arc minutes for precision measuring instruments, machine levels, surveying and geodetic equipment, optical assemblies, alignment mechanisms and special-purpose systems.

The manufacturing range includes glass tubular bubble level vials, circular level vials, simple cylindrical vials, compensated precision vials and chambered vials. Production is available according to GOST 2386-73, legacy technical documentation and customer-controlled OEM specifications.

UKRPRIBOR level vials are manufactured from borosilicate glass and use a low-temperature ether/alcohol-based working fluid. The operating temperature range is −40 °C to +70 °C (−40 °F to +158 °F). Standard and custom configurations can be manufactured according to the required dimensions, sensitivity, division length, graduation pattern and customer drawing.

Precision Level Vial Types

UKRPRIBOR manufactures several principal types of precision glass level vials for industrial, measuring, optical and special-purpose equipment.

GOST 2386-73 Production Range

GOST 2386-73 defines level-vial families with nominal division values ranging from 90 arc minutes (90′) to 1 arc second (1″). The applicable combination of sensitivity, diameter, length and vial construction depends on the particular vial type and execution.

Popular Precision Tubular Level Vial Sizes

The following configurations represent important cylindrical vial sizes within the GOST 2386-73 dimensional families and can also serve as reference points for OEM and replacement enquiries.

International and Custom Glass Tubular Bubble Level Vials

UKRPRIBOR production is not limited to legacy GOST dimensions. Custom glass tubular bubble level vials can be manufactured according to customer-controlled drawings and functional requirements.

Custom OEM production can be specified by:

• outside diameter;
• overall length;
• nominal sensitivity;
• division length;
• graduation pattern;
• bubble working length;
• operating temperature range;
• mounting geometry;
• customer part number;
• inspection and documentation requirements.

UKRPRIBOR can work with metric, inch and dual-dimension engineering drawings. Existing commercial, legacy or discontinued level vials can also be evaluated for replacement production when sufficient dimensional and functional information is available.

Sensitivity and Division Value

For GOST 2386-73 vials, the division value represents the angle through which the vial must be inclined to produce a bubble displacement of one scale division of 2 mm.

A smaller angular value represents a more sensitive vial. For example:

• 60″ / 2 mm is more sensitive than 3′ / 2 mm;
• 10″ / 2 mm is more sensitive than 45″ / 2 mm;
• 2″ / 2 mm represents a high-precision execution.

For custom OEM production, sensitivity must always be specified together with the corresponding division length. Requirements can be evaluated in arc seconds or arc minutes per 2 mm, or according to another customer-defined metric or inch division system.

Borosilicate Glass, Filling Medium and Operating Temperature

UKRPRIBOR precision level vials are manufactured from borosilicate glass. This material is used for the glass body of the precision vial and is suitable for the production of measuring and inclination-sensitive components.

The vials use a low-temperature ether/alcohol-based working fluid selected to maintain reliable bubble mobility under sub-zero operating conditions.

The operating temperature range of the specified UKRPRIBOR execution is −40 °C to +70 °C (−40 °F to +158 °F).

Graduation and Scale Options

Depending on the vial type and customer specification, precision level vials can be produced with different reference-mark and graduation configurations.

• standard graduation marks;
• centre reference marks or crosshair where applicable;
• customer-defined number of lines;
• customer-defined line spacing;
• asymmetric graduation where required by the vial design;
• extended reference marks;
• scale-free execution where technically applicable;
• customer-specific identification and marking.

For custom production, graduation geometry should be defined by the approved drawing or purchase specification.

Normal and Thermally Resistant Executions

GOST 2386-73 provides normal (N) and thermally resistant (T) executions for defined level-vial families. The standard also provides special configurations for selected cylindrical vial types.

UKRPRIBOR production can be selected according to the required operating conditions. The specified operating temperature range for the execution described on this page is −40 °C to +70 °C.

For OEM and special-purpose projects, operating and storage temperature requirements should be stated in the customer technical documentation.

Legacy and Replacement Level Vial Manufacturing

UKRPRIBOR can manufacture replacement level vials for legacy and discontinued measuring instruments, optical equipment, surveying instruments, machine levels and special-purpose assemblies.

A replacement precision vial should not be selected only by its outside dimensions. Correct functional replacement also requires consideration of:

• outside diameter and overall length;
• nominal sensitivity;
• division length;
• graduation geometry;
• bubble working range;
• orientation and mounting;
• operating temperature range.

Where available, customers should provide the original drawing, part number, technical specification or an unused reference sample.

Inspection and Functional Verification

Inspection can be performed against the applicable GOST requirements, approved customer drawing or agreed purchase specification.

Depending on the product and contractual requirements, inspection may include:

• dimensional inspection;
• nominal division value / sensitivity verification;
• bubble movement verification;
• graduation inspection;
• visual workmanship inspection;
• seal-integrity inspection;
• customer-specific acceptance checks.

Inspection and reporting requirements should be agreed before production when documented measurement results or customer-specific acceptance criteria are required.

Applications

UKRPRIBOR precision glass level vials can be used as inclination-sensitive components in:

• precision spirit levels;
• frame levels and machine levels;
• surveying and geodetic instruments;
• theodolites and optical instruments;
• alignment and adjustment systems;
• machine-tool and fixture levelling systems;
• optical and opto-mechanical assemblies;
• precision measuring instruments;
• legacy equipment requiring replacement level vials;
• OEM industrial assemblies;
• special-purpose and defence equipment manufactured to controlled technical documentation.

Standards and Technical Specifications

GOST 2386-73 Product standard defining principal level-vial types, executions, nominal division values, dimensional families and technical requirements. Legacy technical documentation UKRPRIBOR can manufacture replacement and compatible level vials for equipment originally designed around legacy USSR / GOST specifications, subject to the applicable technical requirements. Customer-controlled OEM drawings Custom level vials can be manufactured according to customer-defined dimensions, sensitivity, division length, graduation, operating conditions and acceptance criteria. European and US engineering drawings Metric, inch and dual-dimension engineering documentation can be evaluated for international OEM production.

Compliance with one specification does not automatically imply compliance with another. The applicable standard, drawing revision and acceptance criteria should be identified in the purchase documentation.

OEM, Optical and Defence Applications

UKRPRIBOR can manufacture precision level vials for OEM, optical, measuring and special-purpose applications according to customer-controlled technical documentation.

For defence-related procurement, the applicable drawing, customer part number, configuration revision, sensitivity, operating temperature requirements, inspection procedures, traceability requirements and contractual quality provisions should be specified by the customer.

Custom production can therefore be evaluated for integration into sighting, alignment, adjustment, optical and other precision mechanisms where a bubble level vial is specified as an inclination-sensitive component.

No blanket claim of NATO, MIL or other defence certification is made. Such requirements apply only where they are explicitly specified by the relevant contract or controlled technical documentation.

Documentation Available by Agreement

Depending on the order and agreed inspection scope, UKRPRIBOR can provide:

• Certificate of Conformity;
• Dimensional Inspection Report;
• Sensitivity / Division Value Test Report;
• batch identification and traceability documentation;
• Certificate of Origin where required;
• customer-specific inspection documentation.

The required documentation package should be agreed before production.

Information Required for an RFQ

For the fastest technical evaluation and quotation, please provide:

1. required level vial type;
2. outside diameter and overall length;
3. nominal sensitivity;
4. division length;
5. graduation or reference-mark requirements;
6. required operating temperature range;
7. drawing, part number or legacy designation, if available;
8. required quantity and expected annual demand;
9. inspection requirements;
10. required documentation package.

If the exact specification is unknown, available drawings, photographs, instrument designation and a reference sample can be used as the starting point for technical evaluation.

Frequently Asked Questions

What precision level vials does UKRPRIBOR manufacture?

UKRPRIBOR manufactures glass tubular, circular, compensated and chambered level vials. The GOST 2386-73 product family covers nominal division values from 90 arc minutes down to 1 arc second, depending on vial type and dimensions. Custom OEM configurations can also be evaluated.

What does 45″ / 2 mm mean?

It specifies the angular change required to produce a nominal bubble displacement of one 2 mm scale division. A smaller angular value corresponds to a more sensitive level vial.

What material are UKRPRIBOR precision level vials made from?

UKRPRIBOR precision level vials are manufactured from borosilicate glass and use a low-temperature ether/alcohol-based working fluid.

What is the operating temperature range?

The specified operating temperature range for the execution described on this page is −40 °C to +70 °C (−40 °F to +158 °F).

Can UKRPRIBOR manufacture a level vial that is not listed in GOST 2386-73?

Yes. Custom OEM production can be evaluated according to a customer-controlled drawing defining dimensions, sensitivity, division length, graduation, operating conditions and acceptance requirements.

Can UKRPRIBOR manufacture replacement vials for discontinued instruments?

Yes, subject to technical evaluation. The original drawing or specification is preferred. If documentation is unavailable, dimensional and functional information together with a reference sample can be used for evaluation.

Can level vials be manufactured to inch-based US drawings?

Yes. Inch and dual-dimension customer drawings can be evaluated for OEM production. Sensitivity, division length, dimensional tolerances and acceptance requirements should be stated in the drawing or purchase specification.