Titanium Fasteners Purchase Guide

A reliable fastener purchase defines the complete joint and finished part—not only “titanium bolt,” material grade or thread diameter.

1. Start with the Joint and Service Boundary

Describe what the joint retains, seals, aligns or carries. Record static, cyclic, vibration, fatigue, pressure, thermal and electrical duties; environment; access; installation method; inspection; maintenance and consequences of loosening or failure.

Define clamp load/preload or joint-performance requirement where available.
Identify mating materials, gasket, washer, nut or tapped component and joint stiffness.
State temperature, chemicals, chlorides, seawater, vacuum, oxygen/hydrogen or cleanliness requirements.
Identify reuse, locking, inspection and replacement policy.

2. Define the Fastener Type and Geometry

Name the part precisely: hex bolt, hex cap screw, socket head cap screw, countersunk screw, stud, threaded rod, nut, washer, U-bolt, shoulder fastener or drawing-based part. State head/drive, shank and shoulder, under-head length, thread length, point/end, holes, slots, bends and fillets.

A generic product-family name is not an inspection drawing. Cite the exact dimensional standard and revision or provide a controlled drawing with datums and tolerances.

3. Select Grade, UNS, Condition and Product Basis

State titanium grade/UNS, input form, condition/heat treatment, raw-material specification and finished-fastener specification. Grade 2, Grade 5, Grade 7, Grade 9 and Grade 12 have different composition, strength, formability and corrosion behavior; availability and suitability depend on the actual finished part and order.

Do not substitute by grade name alone

A material minimum tensile value does not prove finished-bolt load capacity. Thread roots, head transition, dimensions, processing, heat treatment, surface and lot testing affect the finished part.

4. Separate Finished-Part, Nut, Material and Thread Standards

Reference	What it controls	Boundary
ASTM F468 / F468M	Specified nonferrous bolts, cap screws and studs for general use within the applicable inch/metric scope	Use only when ordered product/alloy/size and requirements are covered
ASTM F467 / F467M	Specified nonferrous nuts for general use within the applicable inch/metric scope	Match nut, thread and proof requirements to the joint
ASTM B348/B348M	Titanium and titanium-alloy bar/billet input material	Does not establish finished-fastener compliance
ISO 965	ISO general-purpose metric M thread tolerance system and limits	Does not define inch threads or complete fastener geometry
ASME B1.1	Unified inch UN, UNR and UNJ thread forms, series, classes and tolerances	Do not combine with ISO 6g/6H notation
Dimensional / industry standard	Head, drive, body, application or approved part requirements	Cite exact designation, revision and deviations

5. Define the Thread as a Complete Designation

State metric M or Unified inch system, nominal diameter, pitch or threads per inch, coarse/fine/series, thread form, external/internal tolerance class, thread length, start/runout, end condition and whether acceptance is before or after coating/finish.

ISO 965-1:2026 establishes the general-purpose metric M tolerance system.
ISO 965-2:2024 gives limits for defined 6H/6g and 5H/6h ranges; 6g is an external-thread class and 6H an internal-thread class in that scope.
ASME B1.1-2024 addresses Unified inch UN, UNR and UNJ forms; state series and class such as the actual external/internal designation required.
Define gauge standard, calibration, sampling and any pitch-diameter or profile measurement.

6. Freeze Head, Body, Length and Drawing Tolerances

Define head diameter/across flats, head height, drive dimensions, bearing surface, under-head radius, shank/shoulder, total and under-head length, thread extent, point, holes/slots and edge/burr limits. For U-bolts define bend centerline radius, inside width, leg length, thread length and symmetry.

Dimensional inspection of titanium fasteners

7. Freeze the Manufacturing and Heat-Treatment Route

The route may include cold or hot forming, machining, bending, thread rolling or cutting, heat treatment, surface finishing and cleaning depending on grade, form, size, geometry and quantity. Confirm the actual route and whether each operation is internal or externally controlled; do not assume every route applies to every item.

Identify input form, material lot and process sequence.
Define qualification or first-article requirements for formed or drawing-based geometry.
Control heat treatment/condition and testing where applicable.
Require approval for changes to material source, route, tooling, processor or critical parameters.

8. Distinguish Cut and Rolled Threads

Cut and rolled threads differ in material flow, tooling, dimensional response, surface condition and suitable process window. Neither route should be described as universally superior without the ordered geometry, material condition and performance requirement.

State route preference or allow a documented supplier proposal.
Define whether rolling occurs before or after heat treatment where relevant.
Control laps, tears, seams, burrs, root/profile and surface condition.
Link any fatigue or mechanical claim to the actual qualified route and lot testing.

9. Define Finished-Fastener Mechanical Requirements

Specify the applicable property and test requirement for the finished product: tensile, yield, elongation, hardness, proof load/stress, wedge test, shear, fatigue or other project test as applicable. State specimen/product method, quantity, lot definition, sampling, temperature, acceptance and report.

Do not directly replace steel property classes 8.8, 10.9 or 12.9 with a titanium grade. Joint dimensions, preload, stiffness, fatigue, bearing, thread stripping and failure mode require engineering review.

10. Control Mating Parts, Galling and Torque/Preload

Define nut or tapped-part material/specification, washer, engagement, thread class, finish, cleanliness, lubricant or coating, locking method, tightening sequence and installation tool. Titanium-on-titanium and other combinations can gall under unfavorable conditions.

No universal torque table

Torque-preload behavior changes with friction, lubrication/coating, bearing surface, mating material, engagement, joint stiffness, temperature and assembly method. Use a project-approved procedure or test.

11. Specify Surface, Coating, Cleanliness and Marking

State as-machined, pickled, polished, anodized, coated or other surface condition; roughness where needed; burr/edge limits; cleanliness; prohibited residues; color only when functionally controlled; and compatibility with the process environment.

Evaluate coating/anodizing thickness against thread fit and gauges.
Approve anti-seize/lubricant for chemistry, oxygen/hydrogen, vacuum, temperature and cleanliness.
Define marking content/location without damaging critical surfaces.
Protect threads and clean surfaces in packing.

12. Match Inspection and Sampling to Risk

Control	Possible evidence when ordered	Boundary
Material	MTC, heat/lot identity, chemistry and condition; PMI when specified	Sampling/method and report must be stated
Dimensions	Caliper/micrometer, optical/CMM or dedicated fixtures as appropriate	Not every feature needs the same method or sampling
Threads	GO/NO-GO gauges, pitch/major/minor diameter or profile checks	Gauge alone may not cover every drawing characteristic
Mechanical	Tensile, hardness, proof, wedge, fatigue or other applicable lot tests	Only when required and technically applicable
Surface	Visual, roughness, cleanliness, coating/finish and defect inspection	Acceptance standard and lighting/magnification must be agreed
Release	CoC, MTC, inspection/test reports, lot map, marking and packing list	Documents must identify the shipped lot

13. Keep Industry Qualification Boundaries Explicit

Corrosion-resistant industrial fasteners are not automatically aerospace, implant/medical, hydrogen-service, oxygen-service or pressure-code fasteners. Each field may impose specific part standards, approved sources, quality systems, materials, processes, cleanliness, testing, documentation and regulatory responsibilities.

Name the exact qualification or customer specification required.
Separate component supply from equipment/code design responsibility.
Confirm approved material/process sources and lot acceptance.
Do not infer certification from grade, appearance or generic dimensional compliance.

14. Investigate Joint Failure Before Reordering

Possible contributors include insufficient or excessive preload, galling, cross-threading, wrong class or engagement, unsuitable mating material, corrosion/galvanic attack, loosening, fatigue, thread stripping, head-transition stress, surface damage, hydrogen/chemical effects, installation error or an incorrect substitution.

Record joint design, torque/preload method, lubricant, environment, cycles, temperature, fracture location, mating parts and lot identity before cleaning or dismantling.

15. Normalize Commercial and Delivery Scope

Cost and schedule can be driven by grade, input form, fastener type, size, thread, route, heat treatment, surface, quantity, tooling, sampling, destructive testing, first article, documents, marking, kitting, packing and logistics.

Compare the same finished specification and drawing revision.
Separate prototypes/qualification from production quantity.
Record MOQ driver, validity, schedule assumptions, Incoterm and exclusions.
Protect threads, contact surfaces, cleanliness and lot identity in packing.

16. Complete Titanium Fasteners Purchase Guard

16.1 Joint and service conditions

Define retained/sealed load, static/cyclic/vibration duty and failure consequence.
List environment, temperature, chemicals, galvanic pair and cleanliness.
State access, inspection, maintenance and reuse policy.

16.2 Fastener identity and geometry

Name type, head/drive, shank/shoulder, length, thread extent and end.
Cite exact dimensional standard/revision or controlled drawing.
Define datums, tolerances, fillets, burrs, holes, slots and bends.

16.3 Material and finished specification

State grade/UNS, input form/specification, condition and heat/lot.
State finished fastener/nut or customer specification.
Do not use raw-material strength as finished-part acceptance.

16.4 Thread definition

State metric M or Unified inch system, pitch/series, form and class.
Define cut/rolled route, thread length, runout and finish state.
Agree gauges, measurement, calibration, sampling and limits.

16.5 Route and change control

Freeze forming, machining, bending, heat treatment and surface sequence.
Define first article, qualification and production release.
Require approval for critical material/process/tooling/source changes.

16.6 Mating parts and assembly

Specify nut/tapped material, washer, engagement and bearing surfaces.
Approve lubricant/coating, tightening method and locking.
Use a joint-specific preload/torque basis.

16.7 Testing and traceability

Define lot, sampling, dimensional, thread, mechanical and surface tests.
State method, specimen, temperature, limits and report.
Link material heat, process lot, inspection and shipped package.

16.8 Qualification and responsibility

Name applicable aerospace, pressure, clean, oxygen/hydrogen or customer requirements.
Verify approvals instead of using broad industry labels.
Assign joint design, installation and system acceptance responsibility.

16.9 Commercial and delivery

Normalize prototype/production quantity, spares, currency and Incoterm.
Separate tooling, qualification, tests, documents, kitting and freight.
Record schedule assumptions, validity and exclusions.

Red flags before purchase order

Grade only

No finished specification, geometry, thread class or lot acceptance.

Mixed metric and inch notation

ISO 6g/6H and ASME Unified thread classes are combined.

Universal torque

Friction, preload, mating parts, engagement and joint stiffness are absent.

Broad industry qualification

No applicable part, process, quality or source approval is identified.

Decision gate

Do not release the order until joint duty, fastener identity, material, finished specification, thread, route, mating parts, assembly, tests, traceability and commercial terms describe one verifiable deliverable.

17. RFQ and Pre-Order Checklist

Fastener & drawing

Type, head/drive, diameter/pitch, length, thread extent, standard/revision or drawing.

Material & properties

Grade/UNS, condition, input and finished specifications, required mechanical properties.

Thread & route

Metric/inch system, class, cut/rolled preference, forming/machining and heat treatment.

Joint & surface

Mating parts, engagement, environment, preload basis, finish, coating/lubricant and cleanliness.

Inspection & documents

Lot/sample plan, dimensions, thread, mechanical tests, MTC/CoC, marking and traceability.

Commercial

Prototype/production quantity, annual demand, packing, destination, Incoterm and required date.

Submit an RFQ for Review View Titanium Fasteners

18. Titanium Fastener Purchasing FAQ

What should be frozen before comparing titanium-fastener quotations?

Align type, grade/UNS, finished-product standard, dimensions, thread system/class, manufacturing route, surface condition, mating parts, mechanical requirements, sampling, documents, quantity and commercial scope.

What does ASTM F468 cover?

ASTM F468 covers specified commercial wrought nonferrous bolts, hex cap screws, socket head cap screws and studs for general use within its scope. The applicable edition, alloy, size, product type and tests must be confirmed in the purchase order.

What standard applies to titanium nuts?

ASTM F467 covers specified nonferrous nuts for general use in inch-pound sizes, with F467M as the metric companion. The nut material, style, thread and proof requirements must match the mating fastener and order.

Does a GO/NO-GO gauge replace full thread inspection?

No. Gauging is one part of thread acceptance. The order may also need pitch diameter, major/minor diameter, lead, flank, surface, burr and coating-after-thread effects under an agreed sampling plan.

How should galling risk be addressed?

Review mating materials, thread class, finish, cleanliness, lubrication/coating compatibility, engagement, alignment, speed and preload method. No one anti-seize or coating is suitable for every chemical, oxygen, hydrogen, vacuum, clean or medical environment.

When can a titanium fastener be called aerospace-qualified?

Only when the ordered part, material, heat treatment, manufacturing processes, inspections, lot acceptance, quality system and source/customer approvals meet the applicable aerospace specification and approval requirements.