T-Slots or Threaded Holes: Slot Depth 10-25mm

Component Specifications

Definition

T-slots are precisely machined grooves with undercut T-shaped profiles running along granite base surfaces, allowing secure clamping and positioning of machine components using T-bolts. Threaded holes are tapped holes with standardized threads (typically metric or imperial) drilled into the granite, providing direct threaded fastening points. Both features enable flexible, rigid, and repeatable mounting of equipment, fixtures, and accessories on vibration-damping granite bases in precision manufacturing environments.

Working Principle

T-slots work by accepting T-bolts that slide into the slot and rotate 90 degrees to lock under the overhanging edges, distributing clamping forces across the granite surface. Threaded holes provide direct threaded engagement for bolts or studs, creating fixed mounting points. Both utilize granite's dimensional stability, mass, and vibration-damping properties to maintain alignment and reduce machine tool errors.

Materials

Granite (typically black or gray granite with fine grain, low porosity, and high quartz content), ASTM C615 or equivalent; optional stainless steel or brass threaded inserts for reinforced threaded holes.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Slot Depth	10-25mm
Slot Width	8mm, 10mm, 12mm, 14mm, 16mm, 20mm
Thread Size	M6, M8, M10, M12, 1/4-20, 5/16-18, 3/8-16
Slot Spacing	50mm, 100mm, 150mm grid
Surface Finish	Ground and lapped to 1-5μm Ra
Granite Flatness	0.01mm/m to 0.05mm/m

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 230-1, ISO 10791-7, DIN 876, DIN 877

Parent Products

This component is used in the following industrial products

Granite Base Platform

A precision granite platform that serves as the stable foundation for an Automated Coordinate Measuring Machine (CMM) system.

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Engineering Analysis

Risks & Mitigation

Granite cracking during machining or overload
Thread stripping in granite under cyclic loads
Misalignment from improper slot or hole placement
Contamination (chips, coolant) affecting mounting accuracy

FMEA Triads

Trigger: Over-torquing bolts in threaded holes
Failure: Thread stripping or granite micro-cracking
Mitigation: Use torque wrenches, thread inserts, and load distribution plates

Trigger: Impact or shock loads on T-slot edges
Failure: Slot chipping or fracture
Mitigation: Design with rounded slot edges, use protective covers, and limit dynamic loads

Trigger: Thermal expansion mismatch between granite and steel components
Failure: Loss of alignment or stress cracks
Mitigation: Account for CTE in design, use flexible couplings, and control environment temperature

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Schunk, Carr Lane, Jergens, Fixtureworks, TE-CO

Compliance & Inspection

Tolerance

Slot width ±0.05mm, hole position ±0.1mm, thread class 6H for metric or 2B for imperial

Test Method

CMM verification per ISO 10360, thread gauge testing, load testing to 150% of rated capacity

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.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of T-Slots or Threaded Holes

Manufacturer profiles associated with T-Slots or Threaded Holes.

Sourcing T-Slots or Threaded Holes from China?

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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 are the advantages of T-slots over threaded holes on granite bases?

T-slots offer greater flexibility for repositioning components without retapping, while threaded holes provide higher rigidity and load capacity for permanent mounts.

How do you maintain granite T-slots and threaded holes?

Clean regularly with compressed air and mild detergent, avoid abrasive cleaners, and inspect for chipping or thread wear; use thread inserts if threads strip.

Can T-slots and threaded holes be added to existing granite bases?

Yes, but requires precision machining by specialists to avoid cracking the granite; retrofitting is costly and may affect structural integrity.

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.

T-Slots or Threaded Holes