Sensor Bore: Tolerance H7 or tighter

Component Specifications

Definition

A sensor bore is a cylindrical cavity or opening machined into the well body of industrial equipment, engineered to precise dimensional tolerances. Its primary function is to provide a secure, stable, and often sealed housing for various types of sensors (e.g., pressure, temperature, level, vibration). It ensures accurate sensor positioning, protects the sensor from the process environment, and facilitates maintenance or replacement.

Working Principle

The bore acts as an interface between the sensor and the process media inside the well body. It is designed to allow the sensor's sensing element to be exposed to the process conditions (via a diaphragm, probe, or direct contact) while mechanically securing the sensor assembly. The geometry and surface finish ensure proper sealing (often via O-rings, gaskets, or threaded connections) to prevent leaks and maintain process integrity.

Materials

Typically matches or is compatible with the well body material. Common specifications include: Carbon Steel (e.g., AISI 1045, 4140), Stainless Steel (e.g., AISI 304, 316, 316L), Alloy Steel, or Duplex Stainless Steels. Material selection is based on corrosion resistance, pressure rating, temperature, and compatibility with the process fluid.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Depth	Custom to sensor length
Tolerance	H7 or tighter
Thread Type	NPT, BSP, Metric, or SAE (if threaded)
Bore Diameter	Custom (e.g., 12mm, 0.5", 1")
Surface Finish	Ra 1.6 μm or better
Pressure Rating	Matches well body rating (e.g., 1500 psi, 100 bar)
Temperature Range	-50°C to +400°C (material dependent)

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 286-1 (Geometrical product specifications), ASME B1.1 (Unified Inch Screw Threads), DIN 13 (Metric screw threads)

Engineering Analysis

Risks & Mitigation

Improper machining leading to leaks
Corrosion compromising seal integrity
Thread damage during sensor installation/removal
Misalignment causing sensor reading errors

FMEA Triads

Trigger: Incorrect machining tolerance or surface finish.
Failure: Seal failure, resulting in process fluid leaks.
Mitigation: Implement strict quality control (QC) on bore dimensions and finish; use appropriate sealing elements verified for the application.

Trigger: Corrosion or erosion from aggressive process media.
Failure: Bore enlargement or pitting, leading to seal loss and potential sensor damage.
Mitigation: Select corrosion-resistant materials compatible with the process; apply protective coatings if applicable; implement regular inspection schedules.

Trigger: Cross-threading or over-torquing during sensor installation.
Failure: Thread stripping or galling, preventing proper sensor seating and sealing.
Mitigation: Use torque wrenches and follow manufacturer installation procedures; ensure threads are clean and lubricated as specified.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Typically held to ISO IT7 grade or tighter for diameter. Concentricity and perpendicularity tolerances are critical for alignment.

Test Method

Dimensional verification via plug gauges or CMM (Coordinate Measuring Machine). Pressure testing (hydrostatic/pneumatic) of the assembled unit to verify seal integrity. Dye penetrant or ultrasonic testing for critical welds.

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 Sensor Bore

Manufacturer profiles associated with Sensor Bore.

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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 is the primary purpose of a sensor bore?

To provide a precise, sealed, and protected mounting location for a sensor within a well body, ensuring accurate measurement and system integrity.

How are sensor bores typically sealed?

Common sealing methods include O-rings, gaskets, threaded connections with thread sealant, or welded sensor assemblies, depending on the pressure and media.

Can a damaged sensor bore be repaired?

Minor damage can sometimes be repaired by re-machining to a larger standard size and using an adapter sleeve. Significant damage may require welding and re-machining or component replacement.

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.

Sensor Bore