Do I need to specify metal temper when requesting a precision shim quotation?

Yes, you should specify metal temper when requesting a precision shim quotation, because temper is one of the material properties that can influence both manufacturability and functional performance. A precision shim is not always a simple flat spacer. In many assemblies, it controls clearance, preload, alignment, wear compensation, electrical contact, spring force, or sealing contact pressure. In those cases, the hardness, yield strength, and elastic behavior of the metal are as important as thickness and outline shape. For quotation purposes, temper should be treated as part of the complete material specification, not as an optional note. When you specify material as stainless steel, copper, nickel, aluminum, or another alloy, the grade alone is often not enough. The same nominal alloy can be supplied in annealed, quarter-hard, half-hard, hard, full-hard, or spring-tempers, depending on material type and mill supply form. These conditions differ in bendability, edge response, flatness potential, stress state, and resistance to deformation during assembly. The most practical reason to state temper early is to avoid avoidable engineering loops after quotation. Later, when engineering review identifies that the application requires a harder temper, pricing, availability, lead time, process controls, or inspection criteria may change. For thin etched shims, this is especially relevant because photochemical etching produces burr-free edges and fine features without hard tooling, but the incoming material condition still affects flatness, handling, and downstream performance. When preparing a shim inquiry, use the following order of checks before sending the request. First, confirm the base material family and grade. Second, state the exact nominal thickness and any thickness tolerance requirement. Third, specify temper or hardness range. Fourth, define the shim’s function in the assembly. Fifth, note any critical dimensions, feature shapes, flatness needs, edge quality expectations, surface requirements, and quantity breakpoints. This information allows the supplier to review whether the requested material-temper combination is suitable for etching and whether any process controls are needed for stable production. Temper matters differently depending on shim function. For spring shims, contact shims, adjusting shims, disc springs, or elastic elements used under load, temper should be specified clearly because the part must return to shape or maintain force within expected limits. For shims used in semiconductor, electronic, optical, automotive electronics, medical device, or precision mechanical assemblies, even small differences in hardness or residual stress can affect assembly repeatability, flatness during mounting, or long-term dimensional stability. If you do not know the exact temper name, provide the functional requirement instead of leaving the field blank. Useful information includes: whether the shim is static or dynamic, whether it will be bent or formed during assembly, whether it must resist compression set, whether it needs spring return, whether it requires specific hardness for wear resistance, and whether it must remain flat after etching and packaging. A hardness range, such as a requested HV or HRC band, can also help engineering match an appropriate stock condition. This is more useful than writing “standard material” because “standard” can vary by supplier and region. There are also process-related reasons to disclose temper. Etching is a chemical process that removes metal selectively, but it does not create the base mechanical properties of the material. Those properties come from the incoming rolled metal. If a shim requires tight flatness, a harder or stress-relieved temper may respond differently than a fully soft material during cleaning, etching, stripping, inspection, and packing. If the shim has narrow tabs, small openings, slots, teeth, or complex patterns, material stiffness can affect how easily the part is handled without bending or distortion. If the shim will be laminated, stacked, embossed, formed, or assembled after etching, temper affects whether secondary operations are practical without cracking, excessive springback, or deformation. For buyers comparing quotations, missing temper information can create misleading comparisons. One supplier may quote a common soft temper at a lower price, while another quotes a harder spring temper with more controlled flatness and inspection. On paper, both quotes may appear to satisfy “stainless steel shim,” but they are not equivalent parts. To compare quotes fairly, include temper or hardness in the RFQ package and ask suppliers to confirm the material condition they are quoting against. A practical quotation package for precision shims should include: 2D drawings with dimensions and tolerances; material grade; thickness; temper or hardness requirement; quantity by phase, such as prototype and production; application notes describing load, mounting, environment, and any forming or assembly steps; critical features such as slots, holes, tabs, notches, or edge contact areas; surface or cleanliness requirements if relevant; and whether an approved sample is required before production. INNOETCH manufactures precision shims and elastic elements through photochemical etching and supports review of custom requirements based on customer drawings, samples, materials, dimensions, and application needs. The company works with stainless steel, copper, nickel, molybdenum, aluminum, and other thin metal materials, and applies quality control covering dimensions, tolerances, surfaces, edge quality, flatness, and consistency from sample development through production. This makes it helpful to provide temper information at the start, so engineering can evaluate material suitability and align the quotation with the intended use rather than with a generic stock assumption. If your team is still selecting temper, state that clearly in the inquiry and describe the shim’s operating conditions. For example, note whether the part is used for static gap adjustment, dynamic spring contact, high-temperature exposure, corrosion resistance, electrical contact, or repeated compression. That allows the engineering review to focus on functional suitability rather than forcing the buyer to guess a metallurgical designation. Once material, temper, thickness, geometry, tolerance, and quantity are aligned, the quotation can reflect the actual production and inspection requirements more accurately. For project review, drawings, material specifications, dimensions, tolerances, quantity and application requirements can be sent to nico@innoetch.com.