MATERIALS FOR MADE-TO-PRINT COMPONENTS
Stainless steel, aluminum and titanium for your bolts, pivot hardware, shafts, sleeves and spacers. Start with the part.
Start with weight, exposure and the part's function. Then compare the specified stock condition, machined geometry and finished interfaces.
Qualitative selection guide for drawing review. On a small screen, scroll the table sideways to see all six fields.
| Grade & condition | Weight considerations | Environment & corrosion | Part roles to evaluate | Machining & finishing | Key design checks |
|---|---|---|---|---|---|
| 304Stainless steel Specify stock condition | Higher mass than aluminum or titanium at equal volume. | Candidate for general exposure; check chlorides, trapped moisture and cleaning agents. | Custom bolts, shafts, sleeves and spacers. | CNC turning; agree deburring, passivation or polishing where required. | Thread pairing, galling control, preload and actual strength requirements. |
| 316Stainless steel Specify stock condition | No meaningful weight-saving route versus 304. | Molybdenum improves resistance to localized corrosion in many chloride environments; exposure still matters. | Exposed fasteners, retaining parts, shafts and spacers. | Specify surface condition and cleaning; review machining and passivation. | Crevices, drainage and mating materials; corrosion resistance is not a strength class. |
| 316LLow-carbon stainless Separate grade specification | Similar weight considerations to 316. | Low carbon is relevant to intergranular corrosion after welding. | Turned parts where the drawing or joined fabrication calls for 316L. | Retain the L designation and specified condition in purchasing records. | Whether welding is involved; mechanical requirements and accepted standard. |
| 6061Aluminum alloy Temper and form to be agreed | Low mass; section size may be governed by stiffness. | Review wet contact with steel, titanium or carbon composite and the protective finish. | Spacers, sleeves and machined components where loads permit. | Machinability and anodizing are useful selection factors; supply reviewed per project. | Thread engagement, bearing pressure, deflection and finished dimensions. |
| 7075Aluminum alloy T6 by specification; T651 is distinct | Low mass; higher strength than 6061 in comparable T6 conditions does not mean proportional stiffness. | Check corrosion protection and temper against exposure and sustained loading. | Pivot axles, shoulder parts and spacers after design review. | CNC turning and specified anodizing; account for coating growth and masking. | Shoulder transitions, thread roots, fit after finishing and validation requirements. |
| TC4 / Grade 5Ti-6Al-4V alloy family Confirm governing standard | Lower mass than steel at equal volume; greater than aluminum. | Corrosion resistance can be useful; review galvanic contact and the service environment. | Custom bolts, pivot axles, shafts and mating hardware. | Tooling and cycle cost matter; define thread finish, lubrication and surface requirements. | Cross-standard acceptance, galling, contact wear, preload and geometry. |
Raw-material properties do not establish finished-bolt performance. Changing a material requires a joint review covering loads, geometry, preload, engagement, contact pairs and validation.
304 / 316 / 316L
Consider stainless steel when corrosion exposure, service access and durable contact surfaces are central to the part. PremFixer reviews 304, 316 and 316L for custom bolts, shafts, sleeves and spacers, with the grade and stock condition kept on the drawing and order.
304 is a starting point for general environments. The molybdenum in 316 can improve resistance to localized corrosion in chloride exposure, but trapped moisture and crevices still need attention. 316L is the low-carbon variant, particularly relevant where welding affects corrosion behavior. These distinctions do not establish a finished fastener's strength.
A2 / A4 are stainless material groups. A2-70 / A4-80 include finished-fastener property classes; 304 / 316 alone do not prove those classes.
7075 / 6061
Consider aluminum for a part that needs lower mass and can be designed around its thread engagement, contact pressure and stiffness. PremFixer's existing material scope includes 7075-T6; 6061 provides a useful comparison for sleeves, spacers and other turned components. Confirm 6061 stock form, temper and project availability during quotation.
For comparable T6 stock, 7075 offers higher strength than 6061, while their elastic stiffness is much closer. A higher-strength alloy therefore does not remove a deflection problem. Shoulder sections, transitions, bearing seats and engaged threads must work together.
T6, T651 and T6511 describe different processing conditions. The supplier reports shown below record 6061-T651 and 7075-T651; they do not establish T6 supply for a new order.
TC4 / Ti-6Al-4V / Grade 5
Titanium can enter a custom fastener discussion when lower mass than steel and corrosion resistance justify its machining and material cost. Candidate parts include pivot axles, shoulder bolts, shafts and mating hardware for drawing-led bicycle, motorcycle and other OEM projects.
TC4 and Grade 5 are designations associated with the Ti-6Al-4V alloy family under different standards. Specify the governing standard, product form, condition and acceptance requirements; composition naming alone does not make cross-standard stock interchangeable. PremFixer's existing TC2 offering is a separate titanium alloy option, not commercially pure Grade 2.
Founded in 2020, PremFixer Fasteners brings a core team with more than 20 years of accumulated fastener-industry experience. The drawing, sample, BOM and quantity define the manufacturing review.
Confirm drawing revision, material, assembly location and the dimensions that control fit.
Agree stock form and condition, then plan CNC turning and additional machining where the part requires it.
Machine shoulders, bores, drive features and threads. Cutting and rolling are distinct thread routes, selected for the part.
Deburr, coordinate specified finishing and check the critical dimensions in their required finished condition.
Identify paired parts, confirm samples and inspection requirements, and arrange the approved production and packing plan.
Specialist finishing or testing may be coordinated with qualified partners. The quotation identifies the agreed process and documentation scope.
The same material question changes with the shoulder, bearing stack, locking partner and service environment.
Review full-suspension main pivot axles, dual-sided locking hardware, shoulder bolts and matched sleeves or spacers. Coordinate shoulder lengths, bearing contact faces and the complete stack against the frame-platform BOM.
A main pivot near the bottom-bracket area is a suspension joint. Crank or bottom-bracket parts need their own confirmed drawing and part identity.
Send drawings for custom fasteners, shafts, sleeves, spacers and mounting parts. Identify the assembly, mating materials, loads, temperature and exposure so manufacturing feasibility can be reviewed against the actual requirements.
Brake, steering, suspension and other load-bearing positions require project-specific specifications and validation. These examples make no model-fit or general replacement claim.
Specify the grade, standard, stock form, condition, heat or lot identification and required evidence before purchasing. These existing supplier records illustrate the scope of a material document.
Supplier shipment report for the stated round-bar lot and condition. It does not establish availability of every 6061 temper or a finished part's performance.
View 6061-T651 Report
This supplier example names T651. A 7075-T6 order requires its own matching record. The original report, units, results and seal are preserved.
View 7075-T651 ReportAlso available: existing SS304 material record. Its watermarked version is another view of the same report. These are supplier records, not reports from a PremFixer-owned laboratory.
Useful distinctions before the drawing and quotation are released.
Start with the actual exposure: cleaning agents, chloride contamination, wet storage and crevices. 316's molybdenum content can improve localized corrosion resistance in chloride environments, but neither grade is immune to corrosion. Then specify the stock condition and required finished-part properties separately. Thread pairing, lubrication and repeated disassembly also matter, especially where galling could prevent controlled tightening or later service.
Consider 6061 for machined sleeves, spacers and other parts where the load, stiffness and contact requirements permit it. Consider 7075 when additional strength is useful in a weight-sensitive design. Comparable T6 grades have much closer elastic stiffness than tensile strength, so review deflection separately. We confirm the available form and temper for the project; the existing 6061 report is not a blanket supply promise.
The alloy name does not describe the complete stock specification. Heat treatment and stress-relief processes affect properties and machining behavior. T6, T651 and T6511 are different conditions and should remain distinct on the drawing, purchase order and material record. Product form matters too: use the requirements for the actual bar, rod or other stock, rather than substituting a plate data sheet.
State the governing material standard, grade, product form, condition and inspection requirements. TC4 and Grade 5 refer to the Ti-6Al-4V alloy family in different specification systems, but acceptance limits and delivery requirements must be compared before substitution. Name any required bar standard and documentation explicitly. Keep TC2 separate: it is a titanium alloy designation and must not be read as commercially pure Grade 2.
Potentially, after reviewing the whole joint. Compare loading, section size, stiffness, preload, thread engagement, bearing pressure, contact materials and fatigue requirements. Lower density or higher quoted strength alone does not demonstrate equivalence. A redesign may require changed geometry, a different interface or a validation program. For critical load-bearing locations, the customer's design and acceptance requirements govern the review.
Surface treatment can change dimensions, roughness and friction. Define the finished size, coating specification and any masked areas for threads, shoulders, bores and bearing seats. Identify which dimensions are checked before and after treatment. Lubrication and coating also influence tightening behavior, so an installation torque cannot be selected from material name or thread diameter alone. Agree the assembly procedure with the joint requirements.
We can review a coordinated package of pivot axles, shoulder bolts, mating locking parts, sleeves and spacers against your drawings and BOM. Include part numbers, revisions, quantities and an assembly view showing the stack. Define matched dimensions, finishes and how parts should be identified or packed. The quotation confirms the included components, sourcing responsibilities, sample scope and production requirements.
Yes. Bicycle work can start with full-suspension pivot hardware and its bearing, spacer and shoulder interfaces. Motorcycle and powersports requests are reviewed as specific drawing-led projects for fasteners, shafts, sleeves and related parts. Share the assembly location, duty, mating materials and acceptance requirements. We do not assume compatibility with a particular vehicle or approve a safety-critical substitution from a photograph.
Agree the material designation, standard, condition, stock form and required heat or lot linkage before ordering. Depending on the supply route, the package may include the supplier's material document and specified dimensional inspection records. State any particular certificate or test requirement in the RFQ so its availability and scope can be confirmed. An example report on this page applies only to its recorded material.
Start with your contact details, a brief description, a drawing or sample reference, and quantity or project stage. Include the material and condition if known, or request a material review. A drawing revision, STEP file, assembly location, finish, mating materials and critical dimensions help refine the review. These can be added as the discussion progresses through our existing inquiry form.
Material context: Outokumpu 316 / 316L overview, Kaiser rod and bar data, ATI Ti-6Al-4V data sheet. Use the applicable stock specification for the order; these sources are not finished-part guarantees.
YOUR DRAWING. THE NEXT STEP.
Share your drawing or sample, material requirements and quantity. Include the assembly location and finish where available so we can review the part with its manufacturing and mating interfaces.
