Sear: Pivot Hole Diameter 3-8 mm, Width 5-20 mm

Component Specifications

Definition

The Sear is a critical mechanical component within trigger assemblies, typically functioning as a precision lever or catch mechanism that controls the release of stored energy to initiate machine operations. It maintains a loaded position until a specific force threshold is applied, at which point it disengages to activate the connected system. In industrial machinery, sears are engineered for precise timing, repeatable actuation, and reliable force transmission between control inputs and mechanical outputs.

Working Principle

The Sear operates on the principle of mechanical advantage and controlled release. It maintains a loaded position through geometric locking or friction, resisting movement until an external force (typically from a trigger or actuator) overcomes its resistance threshold. Once disengaged, it transfers kinetic energy to downstream components through rotational or linear motion, initiating the machine cycle. The precise angle of engagement surfaces determines the force required for release and the speed of subsequent motion.

Materials

High-strength alloy steel (AISI 4140 or equivalent), case-hardened to 45-50 HRC for wear resistance. Alternative materials include stainless steel (17-4PH) for corrosive environments or engineered polymers (PEEK, reinforced nylon) for lightweight applications.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Width	5-20 mm
Length	25-100 mm
Hardness	45-50 HRC
Thickness	3-10 mm
Release Force	5-50 N
Surface Finish	Ra 0.8-1.6 μm
Engagement Angle	15-45 degrees
Pivot Hole Diameter	3-8 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 2768-m, DIN 7168, ISO 8015

Engineering Analysis

Risks & Mitigation

Premature release due to wear
Failure to release from material fatigue
Corrosion in harsh environments
Improper installation causing misalignment

FMEA Triads

Trigger: Surface wear on engagement area
Failure: Premature release or failure to release
Mitigation: Regular inspection and replacement schedule, use of wear-resistant materials, proper lubrication

Trigger: Material fatigue from cyclic loading
Failure: Fracture under operational stress
Mitigation: Fatigue life testing during design, implementation of load monitoring, scheduled replacement based on cycle count

Trigger: Corrosion in humid or chemical environments
Failure: Seizing or unpredictable release characteristics
Mitigation: Use of corrosion-resistant materials, protective coatings, environmental controls

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05mm on critical dimensions, ±1 degree on engagement angles

Test Method

Release force testing per ISO 13849-1, wear testing per ASTM G99, fatigue testing per ISO 12107

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 Sear

Manufacturer profiles associated with Sear.

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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 function of a sear in industrial machinery?

The sear functions as a precision release mechanism that maintains a loaded position until a specific force is applied, then transfers energy to initiate machine operations with controlled timing and force.

How do I select the appropriate sear material for my application?

Consider operating environment (corrosion, temperature), required strength and wear resistance, and compatibility with mating components. Alloy steel is standard for durability, stainless steel for corrosive environments, and engineered polymers for lightweight or non-sparking applications.

What maintenance is required for sear components?

Regular inspection for wear on engagement surfaces, lubrication of pivot points, verification of release force consistency, and replacement when wear exceeds 0.1mm on critical surfaces or when release force deviates by more than 15% from specification.

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.

Sear