Locking Screws: Torque Range 0.5 Nm to 25 Nm

Component Specifications

Definition

Locking screws are specialized threaded fasteners used in mirror mount assemblies to firmly secure optical components against displacement. They feature locking mechanisms that prevent loosening under vibration, thermal cycling, or dynamic loads, ensuring precise alignment and stability in optical systems. These screws maintain consistent clamping force and positional accuracy critical for applications requiring micron-level precision.

Working Principle

Locking screws operate through mechanical interference or friction-based locking mechanisms. Common designs include nylon-insert lock nuts, prevailing torque lock nuts, or thread-locking adhesives that create resistance against rotational forces. When tightened, these screws generate axial clamping force that secures components while the locking mechanism prevents back-off through elastic deformation, chemical bonding, or mechanical interference with mating threads.

Materials

Typically manufactured from alloy steel (grade 8.8, 10.9, or 12.9), stainless steel (A2/A4 grades), or titanium alloys. Surface treatments include zinc plating, black oxide, or dichromate coatings for corrosion resistance. Locking elements may incorporate nylon inserts, metal locking collars, or chemical thread-locking compounds.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	6mm to 50mm
Head Type	Hex socket, slotted, or Phillips
Thread Size	M3 to M12
Locking Type	Nylon insert, all-metal lock, or chemical adhesive
Torque Range	0.5 Nm to 25 Nm
Temperature Range	-40°C to 120°C (standard), up to 200°C (high-temp variants)
Vibration Resistance	MIL-STD-1312 compliant

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 898-1, ISO 10511, DIN 6923, DIN 934, ASME B18.2.4.6M

Parent Products

This component is used in the following industrial products

Mirror Mount Assembly

A precision mechanical assembly for holding and adjusting optical mirrors in laser systems.

View Product Details

Engineering Analysis

Risks & Mitigation

Over-torquing can strip threads or damage optical components
Incorrect material selection may cause galvanic corrosion
Locking mechanism failure under extreme temperatures
Improper installation leading to misalignment

FMEA Triads

Trigger: Insufficient torque during installation
Failure: Component loosening and positional drift
Mitigation: Implement calibrated torque wrenches and regular inspection protocols

Trigger: Material incompatibility in corrosive environments
Failure: Thread corrosion and seizure
Mitigation: Use stainless steel or coated screws with proper material pairing

Trigger: Excessive vibration beyond design limits
Failure: Locking mechanism fatigue and failure
Mitigation: Select screws with higher vibration resistance ratings and implement damping systems

Industrial Ecosystem

Compatible With

Optical mirror mounts, laser alignment systems, precision instrumentation, telescope assemblies, interferometer setups

Typical Suppliers & Equivalents

Würth, Bossard, Fastenal, Nord-Lock, Spiralock, 3M threadlockers

Compliance & Inspection

Tolerance

Thread tolerance: 6g per ISO 965-1, dimensional tolerance: ±0.1mm per ISO 2768-m

Test Method

Vibration testing per MIL-STD-1312, torque-tension testing per ISO 16047, salt spray testing per ISO 9227

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 Locking Screws

Manufacturer profiles associated with Locking Screws.

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Frequently Asked Questions

What distinguishes locking screws from standard screws in mirror mount applications?

Locking screws incorporate specialized mechanisms (nylon inserts, prevailing torque features, or adhesives) that prevent loosening under vibration and thermal cycling, whereas standard screws rely solely on friction and may require periodic retightening.

How do I select the appropriate locking screw for a mirror mount assembly?

Consider vibration levels, thermal expansion coefficients, required torque values, material compatibility with the mount, and environmental conditions. Always verify compliance with relevant ISO/DIN standards for your application.

Can locking screws be reused after installation?

Nylon-insert locking screws have limited reusability (typically 3-5 cycles) as the nylon degrades. All-metal locking screws offer better reusability, while chemically locked screws are generally single-use. Always consult manufacturer specifications.

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.

Locking Screws