{"id":6803,"date":"2022-04-21T14:10:13","date_gmt":"2022-04-21T06:10:13","guid":{"rendered":"https:\/\/xzfastener.com\/?p=6803"},"modified":"2026-06-22T14:12:04","modified_gmt":"2026-06-22T06:12:04","slug":"how-to-order-fasteners-from-china-when-you-only-have-samples","status":"publish","type":"post","link":"https:\/\/xzfastener.com\/es_mx\/how-to-order-fasteners-from-china-when-you-only-have-samples\/","title":{"rendered":"C\u00f3mo pedir sujetadores en China cuando solo tienes muestras"},"content":{"rendered":"<p>Ordering fasteners from China with only physical samples is common. Many buyers do not have drawings, standards, or old purchase records. They only have one used bolt, a worn nut, a screw from equipment maintenance, or an anchor taken from a jobsite.<\/p>\n\n\n\n<p>This can work, but it needs a controlled process. A sample is useful, but it is not a complete specification.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Samples Alone Are Risky<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">A Sample Shows Shape, Not Full Requirements<\/h3>\n\n\n\n<p>A fastener sample helps identify size, thread, head style, and surface finish. But it may not confirm material grade, heat treatment, coating thickness, hardness, or original standard.<\/p>\n\n\n\n<p>A used sample may also be worn, stretched, rusted, or damaged.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Sample Detail<\/th><th>Can Usually Be Checked<\/th><th>May Still Be Unknown<\/th><\/tr><\/thead><tbody><tr><td>Di\u00e1metro<\/td><td>si<\/td><td>Original tolerance<\/td><\/tr><tr><td>Longitud<\/td><td>si<\/td><td>Correct working length if worn<\/td><\/tr><tr><td>Paso de rosca<\/td><td>si<\/td><td>Thread tolerance class<\/td><\/tr><tr><td>Forma de la cabeza<\/td><td>si<\/td><td>Original production standard<\/td><\/tr><tr><td>Coating color<\/td><td>en parte<\/td><td>Coating thickness and salt spray<\/td><\/tr><tr><td>Materiales<\/td><td>Not by appearance<\/td><td>Grade, chemistry, heat treatment<\/td><\/tr><tr><td>fuerza<\/td><td>Not by appearance<\/td><td>Tensile, proof load, hardness<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>For common products, buyers should first compare the sample with <a href=\"https:\/\/xzfastener.com\/es_mx\/products-category\/standard-fasteners\/\">sujetadores est\u00e1ndar<\/a> to see if it matches an existing DIN, ISO, ASTM, or ANSI item.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 1: Identify the Fastener Type<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Start With the Basic Form<\/h3>\n\n\n\n<p>Before asking for price, define what the part is.<\/p>\n\n\n\n<p>Is it a hex bolt, socket screw, carriage bolt, stud bolt, anchor bolt, washer, nut, self-tapping screw, or custom part?<\/p>\n\n\n\n<p>For bolts and screws, check:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>tipo de cabeza<\/li>\n\n\n\n<li>Tipo de unidad<\/li>\n\n\n\n<li>Di\u00e1metro<\/li>\n\n\n\n<li>Longitud<\/li>\n\n\n\n<li>Paso de rosca<\/li>\n\n\n\n<li>Longitud del hilo<\/li>\n\n\n\n<li>Hilo completo o rosca parcial<\/li>\n\n\n\n<li>Point or end shape<\/li>\n<\/ul>\n\n\n\n<p>For bolt-related items, review common <a href=\"https:\/\/xzfastener.com\/es_mx\/fastener-type\/bolts\/\">productos de pernos<\/a>. For washers, check <a href=\"https:\/\/xzfastener.com\/es_mx\/fastener-type\/washers\/\">productos de lavado<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 2: Measure the Sample Correctly<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Do Not Measure Only Overall Length<\/h3>\n\n\n\n<p>Use calipers, thread gauges, and weight checks. If possible, provide clear photos beside a ruler and send several samples, not only one piece.<\/p>\n\n\n\n<p>Important dimensions include:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Di\u00e1metro mayor<\/li>\n\n\n\n<li>Longitud total<\/li>\n\n\n\n<li>Paso de rosca<\/li>\n\n\n\n<li>Longitud del hilo<\/li>\n\n\n\n<li>altura de la cabeza<\/li>\n\n\n\n<li>Width across flats or head diameter<\/li>\n\n\n\n<li>Di\u00e1metro del mango<\/li>\n\n\n\n<li>Washer ID, OD, and thickness if included<\/li>\n<\/ol>\n\n\n\n<p>For special parts, these measurements should be converted into a drawing before production.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 3: Confirm Material and Grade<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Appearance Is Not Enough<\/h3>\n\n\n\n<p>A carbon steel bolt and alloy steel bolt may look similar. Stainless steel grades may also look similar. Do not rely on color or magnet response alone.<\/p>\n\n\n\n<p>Ask the supplier to confirm:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Grado de material<\/li>\n\n\n\n<li>Clase de propiedad mec\u00e1nica<\/li>\n\n\n\n<li>Hardness requirement<\/li>\n\n\n\n<li>Requisito de tratamiento t\u00e9rmico<\/li>\n\n\n\n<li>Requisito de certificado<\/li>\n\n\n\n<li>Application load condition<\/li>\n<\/ul>\n\n\n\n<p>For load-bearing parts, compare <a href=\"https:\/\/xzfastener.com\/es_mx\/products-category\/high-strength-fasteners\/\">sujetadores de alta resistencia<\/a> and request test reports before mass production.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 4: Check Coating and Surface Finish<\/h2>\n\n\n\n<p>The sample may be zinc plated, hot-dip galvanized, black oxide, zinc flake, PTFE coated, or stainless steel. But old samples can lose color or coating after use.<\/p>\n\n\n\n<p>For corrosion-sensitive applications, provide the working environment:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Indoor or outdoor<\/li>\n\n\n\n<li>Marine or humid area<\/li>\n\n\n\n<li>Underground or chemical exposure<\/li>\n\n\n\n<li>Required salt spray hours<\/li>\n\n\n\n<li>Color requirement<\/li>\n\n\n\n<li>Ajuste de rosca despu\u00e9s del recubrimiento<\/li>\n<\/ul>\n\n\n\n<p>For finish options, review <a href=\"https:\/\/xzfastener.com\/es_mx\/products-category\/various-coated-fasteners\/\">varios sujetadores recubiertos<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 5: Make a Drawing Before Mass Production<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Samples Should Become Controlled Specifications<\/h3>\n\n\n\n<p>If the part is not a standard item, the supplier should prepare a drawing for approval. The buyer should check every dimension before production starts.<\/p>\n\n\n\n<p>For non-standard items, use <a href=\"https:\/\/xzfastener.com\/es_mx\/products-category\/custom-non-standard-fasteners\/\">sujetadores personalizados no est\u00e1ndar<\/a>.<\/p>\n\n\n\n<p>A good drawing should show:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Art\u00edculo de dibujo<\/th><th>Por qu\u00e9 es importante<\/th><\/tr><\/thead><tbody><tr><td>Dimensiones<\/td><td>Prevents wrong size production<\/td><\/tr><tr><td>Tolerances<\/td><td>Ajuste y montaje de controles.<\/td><\/tr><tr><td>Materiales<\/td><td>Confirms strength and corrosion resistance<\/td><\/tr><tr><td>terminar<\/td><td>Controls coating and appearance<\/td><\/tr><tr><td>Thread details<\/td><td>Evita que las tuercas coincidan<\/td><\/tr><tr><td>Inspection points<\/td><td>Avoids disputes after production<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Step 6: Approve a Pre-Production Sample<\/h2>\n\n\n\n<p>Before bulk production, ask for a sample or first-piece inspection report. Compare it with the original sample and the approved drawing.<\/p>\n\n\n\n<p>Check assembly fit with mating nuts, washers, holes, or equipment parts if possible.<\/p>\n\n\n\n<p>For large or critical orders, do not skip this step.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Consejo final<\/h2>\n\n\n\n<p>When ordering fasteners from China with only samples, the safest process is simple: identify the part, measure it, confirm material and grade, define coating, create a drawing, approve a sample, then start production.<\/p>\n\n\n\n<p>A sample can begin the discussion. A clear specification protects the order.<\/p>","protected":false},"excerpt":{"rendered":"<p>Ordering fasteners from China with only physical samples is common. Many buyers do not have drawings, standards, or old purchase records. They only have one used bolt, a worn nut, a screw from equipment maintenance, or an anchor taken from a jobsite. This can work, but it needs a controlled process. A sample is useful, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[479],"tags":[495],"class_list":["post-6803","post","type-post","status-publish","format-standard","hentry","category-fastener-knowledge-library","tag-sourcing-fasteners-from-china"],"acf":[],"_links":{"self":[{"href":"https:\/\/xzfastener.com\/es_mx\/wp-json\/wp\/v2\/posts\/6803","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xzfastener.com\/es_mx\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xzfastener.com\/es_mx\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xzfastener.com\/es_mx\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/xzfastener.com\/es_mx\/wp-json\/wp\/v2\/comments?post=6803"}],"version-history":[{"count":1,"href":"https:\/\/xzfastener.com\/es_mx\/wp-json\/wp\/v2\/posts\/6803\/revisions"}],"predecessor-version":[{"id":6804,"href":"https:\/\/xzfastener.com\/es_mx\/wp-json\/wp\/v2\/posts\/6803\/revisions\/6804"}],"wp:attachment":[{"href":"https:\/\/xzfastener.com\/es_mx\/wp-json\/wp\/v2\/media?parent=6803"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xzfastener.com\/es_mx\/wp-json\/wp\/v2\/categories?post=6803"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xzfastener.com\/es_mx\/wp-json\/wp\/v2\/tags?post=6803"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}