Mounting Holes / Tapped Threads: Component Specs, Materials & Applications

Component Specifications

Definition

Mounting holes with internal tapped threads are precision-machined features on linear guide bearing housings designed to provide secure attachment points to machine frames, bases, or other structural components. These threaded holes ensure proper alignment, load distribution, and vibration resistance for linear motion systems.

Working Principle

Threaded holes create mechanical fastening points through friction and axial clamping force when bolts are tightened, transferring loads from the bearing housing to the machine structure while maintaining precise alignment of the linear guide system.

Materials

Typically matching the housing material: cast iron (GGG40/50), aluminum alloys (AlSi10Mg, 6061-T6), or steel (S45C, SS400). Thread inserts may be steel (SCM435) or stainless steel (SUS304) for wear resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thread Type	Metric (M), Unified (UNC/UNF)
Common Sizes	M4, M5, M6, M8, M10, 1/4-20, 5/16-18
Thread Class	6H for metric, 2B for unified
Thread Depth	1.5D to 2D (where D is thread diameter)
Hole Tolerance	H7 for through holes, H13 for blind holes
Surface Finish	Ra 3.2 μm or better

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 965, DIN 13, ISO 4762, DIN 912

Parent Products

This component is used in the following industrial products

Linear Guide / Bearing Housing

A structural component that houses and supports linear bearings or guide rails, providing precise linear motion guidance within mechanical systems.

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Engineering Analysis

Risks & Mitigation

Thread stripping under excessive torque
Misalignment causing binding
Corrosion in threaded areas
Fatigue failure from vibration
Improper load distribution

FMEA Triads

Trigger: Insufficient thread engagement depth
Failure: Thread stripping under load
Mitigation: Design holes with minimum 1.5D thread depth and verify with depth gauge during inspection

Trigger: Cross-threading during installation
Failure: Damaged threads requiring repair
Mitigation: Implement operator training, use guide fixtures, and specify self-aligning washers

Trigger: Vibration loosening
Failure: Bolts backing out, causing misalignment
Mitigation: Use thread-locking compounds, lock washers, or prevailing torque nuts

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Position tolerance ±0.1mm, perpendicularity 0.05mm/100mm, thread pitch diameter within ISO 965 limits

Test Method

Go/no-go thread gauges, coordinate measuring machines (CMM) for position verification, torque testing for pull-out strength

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

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

Manufacturers of Mounting Holes / Tapped Threads

Manufacturer profiles associated with Mounting Holes / Tapped Threads.

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Frequently Asked Questions

What is the recommended torque for mounting bolts in these threaded holes?

Torque values depend on bolt size, material, and thread engagement. For M6 steel bolts in cast iron: 8-10 Nm; for M8: 18-22 Nm. Always follow manufacturer specifications and use calibrated torque wrenches.

How do I prevent thread damage during installation?

Use proper thread engagement (1.5D minimum), clean threads before assembly, apply appropriate lubricant, avoid cross-threading by starting bolts straight, and use thread inserts in soft materials like aluminum.

Can damaged threads be repaired without replacing the housing?

Yes, using helicoil inserts or threaded inserts can restore damaged threads. For critical applications, consult the manufacturer for approved repair procedures to maintain load capacity.

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.

Mounting Holes / Tapped Threads