System Protocol: Dimensional Integrity Verified

Dimensional Certainty Protocol.

Name: h7 Tolerance Precision Ground Titanium Rods
Brand: ValidTi
Availability: InStock

Precision-ground titanium rods with h7 tolerance (0/-0.015mm). Engineered for Swiss lathe machining of dental implant components with zero dimensional drift.

Tolerance h7 (±0.015mm)

Material Ti-6Al-4V ELI

Tensile Str. 950+ MPa

Inspection 100% Laser

Application Restriction: ValidTi precision rods are intended for fabricating dental prosthetic components (abutments, screws, healing caps) NOT for manufacturing bone-level implant fixtures. Device validation remains the fabricator's responsibility.

01 Understanding h7 Tolerance

What is h7 Tolerance?

h7 is an ISO 286 tolerance grade representing tight dimensional control for shaft-type components. The "h" indicates the tolerance zone is positioned entirely below the nominal diameter (0 to negative deviation).

EXAMPLE: Ø10mm Rod

Nominal: 10.000mm

Actual Range: 9.985 - 10.000mm

Deviation: 0 / -0.015mm

INTERPRETATION:

Rod diameter will NEVER exceed nominal. Maximum undersizing is 15 microns (0.015mm).

Why h7 Matters for Swiss Lathe

Collet Grip Consistency

Swiss lathes use split collets that require consistent rod diameter. h7 prevents slippage and vibration during high-RPM spindle operation.
Tool Life Predictability

Dimensional variation <15μm means cutting depth remains constant. Eliminates unexpected tool breakage from diameter "jumps".
No Mid-Run Adjustments

CNC programs don't need offset compensation between bars. Same G-code produces identical parts across entire production run.

02 Tolerance Grade Comparison

Tolerance Grade	Deviation (Ø10mm)	Typical Application	ValidTi Suitability
h6	0 / -0.009mm	High-precision bearings, gauge blocks	Overkill for dental (costly)
h7 ✓	0 / -0.015mm	Swiss lathe stock, precision shafts	RECOMMENDED (ValidTi Standard)
h8	0 / -0.022mm	General machining, CNC turning	Acceptable for lower-volume work
h9	0 / -0.036mm	Manual lathe, rough machining	NOT recommended (collet issues)
h11 (Commercial)	0 / -0.090mm	Raw bar stock, low-precision work	Unsuitable for Swiss lathe

* Deviation values per ISO 286-2:2010 for nominal diameter 10mm. Other diameters have proportional tolerances.

03 Manufacturing Process: Centerless Grinding

Process Overview

ValidTi h7 rods are produced using centerless grinding, a continuous-feed precision grinding method that removes material uniformly across the entire rod length without requiring center holes.

Step 1: Raw Bar Preparation

Starting material: Hot-rolled Grade 23 ELI bars (h11 tolerance), acid-pickled to remove surface scale.

Step 2: Centerless Grinding

Diamond grinding wheels remove 0.2-0.5mm per side, achieving h7 tolerance and Ra 0.4μm surface finish.

Step 3: 100% Laser Inspection

Every rod passes through laser micrometer (±0.001mm resolution) for full-length dimensional verification.

Quality Control Parameters

Parameter	Specification
Diameter Tolerance	h7 (0/-0.015mm)
Straightness	≤0.2mm/m
Surface Finish (Ra)	0.4μm (16 μin)
Roundness	≤0.005mm
Length Tolerance	±0.5mm
Surface Defects	None (visual 100%)

Inspection Certificate

Each batch includes dimensional inspection report with diameter measurements at 5 points per rod.

04 Available Sizes & Stock Status

Diameter	h7 Tolerance	Standard Lengths	Typical Application	Stock Status
Ø 4mm	0/-0.012mm	300mm, 1000mm	Healing screws, small abutments	IN STOCK
Ø 5mm	0/-0.012mm	300mm, 1000mm	Abutment screws, transfer copings	IN STOCK
Ø 6mm	0/-0.015mm	300mm, 1000mm, 3000mm	Standard abutments, UCLA blanks	IN STOCK
Ø 8mm	0/-0.015mm	300mm, 1000mm, 3000mm	Wide-platform abutments	IN STOCK
Ø 10mm	0/-0.015mm	300mm, 1000mm, 3000mm	Multi-unit abutments, bars	IN STOCK
Ø 12mm	0/-0.018mm	300mm, 1000mm, 3000mm	Implant bars, surgical instruments	IN STOCK
Ø 14-20mm	Per ISO 286	300mm, 1000mm (custom avail.)	Large bars, surgical tools	7-DAY LEAD

Custom diameters and lengths available for orders 100+ meters. Contact engineering for feasibility.

05 Swiss Lathe Compatibility

ValidTi h7 rods are optimized for Swiss-type automatic lathes from leading manufacturers. The tight tolerance ensures consistent bar feeding and eliminates guide bushing wear.

Citizen Cincom Series

• Cincom L20/L32
• A20/A32 (Bar Diameter 20/32mm)
• R07/R04 (Micro Swiss)
✓ Collet fit verified

Star Micronics SR Series

• SR-20R/SR-32J
• SV-20/SV-32 (Vertical)
• ECAS-20 (Hybrid CNC)
✓ Guide bushing compatible

Tornos Deco/MultiDeco

• Deco 10/13/20
• MultiDeco 20/26
• SwissNano (Micro)
✓ Bushing clearance optimized

Anti-Galling Recommendation

Grade 23 titanium is prone to galling in guide bushings. Apply MoS₂ (molybdenum disulfide) lubricant to bar stock before loading. See our Anti-Galling Protocol for detailed procedures.

06 Material Specifications (ASTM F136)

Chemical Composition

Element	ASTM F136 Requirement
Aluminum (Al)	5.50-6.50%
Vanadium (V)	3.50-4.50%
Iron (Fe)	≤0.25%
Oxygen (O) - ELI	≤0.13% (Extra Low)
Carbon (C)	≤0.08%
Titanium (Ti)	Balance

Mechanical Properties

Property	ValidTi Typical
Tensile Strength	950-1050 MPa
Yield Strength	880-920 MPa
Elongation	12-15%
Modulus of Elasticity	110 GPa
Hardness (HRC)	36-38
Density	4.43 g/cm³

07 Quality Documentation

Material Certificates

✓ EN 10204-3.1 MTC
✓ Certificate of Analysis (CoA)
✓ Dimensional Inspection Report

Regulatory Compliance

✓ ISO 13485:2016 (Notified Body: NQA)
✓ FDA Registration (Est. 3033849259)
✓ ISO 10993 Biocompatibility

Traceability

✓ Laser-etched Lot Number
✓ Heat-to-Heat Traceability
✓ Online Lot Lookup Portal

Request Technical Quotation

Specify diameter, length, and annual volume for tiered pricing. Stock sizes ship within 3-5 days. Custom specifications available for volume orders.

REQUEST QUOTATION TECHNICAL CONSULTATION

MOQ: 5 Rods (Test Order) / 50 Rods (Production)

Related Resources

Technical Protocol