{"id":121,"date":"2025-07-25T11:48:11","date_gmt":"2025-07-25T02:48:11","guid":{"rendered":"https:\/\/www.seiken.co.jp\/english\/wp\/?page_id=121"},"modified":"2025-10-07T13:17:43","modified_gmt":"2025-10-07T04:17:43","slug":"single_ended","status":"publish","type":"page","link":"https:\/\/www.seiken.co.jp\/english\/products\/probe\/single_ended\/","title":{"rendered":"Single-Ended Probes"},"content":{"rendered":"<div class=\"anchor\">\n<ul class=\"anchor_list container\">\n<li><a href=\"#structure\">Structure<\/a><\/li>\n<li><a href=\"#type\">Types<\/a><\/li>\n<li><a href=\"#usage\">Details<\/a><\/li>\n<li><a href=\"#order\">Orders<\/a><\/li>\n<li><a href=\"#jig\">Fixture Manufacturing<\/a><\/li>\n<\/ul><\/div>\n<section id=\"structure\" class=\"container\">\n<h2>The Structure of Single-Ended Probes<\/h2>\n<div class=\"column2\">\n<div class=\"txt_wrap\">\n<p>Contact probes\u2014also known as pogo pins, probe pins, or spring-loaded pins\u2014are essential components used in a wide range of electrical continuity and circuit board inspections among other applications. Each probe consists of three main parts: the plunger, barrel (pipe), and spring.<\/p>\n<p>\n              <span class=\"-bold\">Plunger: <\/span>Contacts directly the target electrode, applying the appropriate force through its stroke motion.<br \/>\n              <br \/><span class=\"-bold\">Barrel: <\/span>Houses the internal spring and guides the plunger\u2019s motion, ensuring mechanical stability.<br \/>\n              <br \/><span class=\"-bold\">Spring: <\/span>Adjusts the contact force (spring load), enabling reliable and consistent electrical connections.\n            <\/p>\n<p>As the plunger moves within the spring-loaded barrel, it maintains stable contact with the target electrode\u2014making precise and repeatable electrical testing possible.<\/p>\n<\/p><\/div>\n<figure>\n            <img decoding=\"async\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/themes\/wp-seiken-en\/assets\/images\/products\/probe\/single_ended\/structure_img01.jpg\" alt=\"The Structure of Single-Ended Probes\"><br \/>\n          <\/figure>\n<\/p><\/div>\n<\/section>\n<section id=\"type\" class=\"container\">\n<h2>Types of Single-Ended Probes<\/h2>\n<h3>Probe Materials and Characteristics<\/h3>\n<p>The materials listed below are standard examples. We can propose custom materials tailored to your inspection requirements.<\/p>\n<table class=\"table -single_ended -sp_vertical\">\n<thead>\n<tr>\n<th>Parts \/ Process<\/th>\n<th>Material<\/th>\n<th>Characteristics\u200b<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<th rowspan=\"4\">Plunger<\/th>\n<td class=\"material\">Beryllium copper (BeCu)<\/td>\n<td class=\"feature\">\n<p>Commonly used for its low electrical resistance. With a hardness around HV-400, it may wear quickly when used on hard surfaces. It is non-magnetic.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"material\">Free-cutting carbon tool steel (SK)<\/td>\n<td class=\"feature\">\n<p>Also widely used, offering higher hardness (approx. HV-600) and better durability\u2014ideal for needle and crown-type tips. It is magnetic.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"material\">Lead-free SK<\/td>\n<td class=\"feature\">\n<p>Conventional cutting materials often contain small amounts of lead. This lead-free variant offers improved machinability while eliminating lead content.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"material\">Metal alloys (S2 or S5)<\/td>\n<td class=\"feature\">\n<p>Alloys of silver, palladium, and copper, offering hardness of HV-400\u2013500, long life, and low resistance. Plating is not required, and it&#8217;s resistant to solder transfer. It is non-magnetic.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<th rowspan=\"3\">Barrel<\/th>\n<td class=\"material\">Phosphor bronze (PB)<\/td>\n<td class=\"feature\">\n<p>An alloy of tin and phosphorus, commonly used for general-purpose applications. It is non-magnetic.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"material\">Brass (Bs)<\/td>\n<td class=\"feature\">\n<p>Used for thicker probes; an alloy containing zinc. It is non-magnetic.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"material\">Nickel Silver (NS)<\/td>\n<td class=\"feature\">\n<p>A copper-based alloy with nickel, resistant to discoloration and corrosion without plating. Used in SQ catalog series only.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<th rowspan=\"4\">Spring<\/th>\n<td class=\"material\">Piano wire (SWP)<\/td>\n<td class=\"feature\">\n<p>SWP is typically used in standard probes and is suitable for room-temperature applications. The spring load can also be customized to meet specific requirements.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"material\">Stainless steel (SUS)<\/td>\n<td class=\"feature\">\n<p>Withstands higher temperatures (up to 200\u00b0C) and provides superior heat and corrosion resistance. Offers slightly lower spring load.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"material\">NAS<\/td>\n<td class=\"feature\">\n<p>High-performance material suitable for temperatures up to 270\u00b0C. Also ideal for non-magnetic applications.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"material\">Seiken Original<br \/>Non-Magnetic Spring<\/td>\n<td class=\"feature\">\n<p>Completely non-magnetic and compatible with ultra-fine pitch probes (as small as 150\u03bcm pitch).<\/p>\n<\/td>\n<\/tr>\n<tr>\n<th rowspan=\"4\">Plating<\/th>\n<td class=\"material\">Nickel (Ni)<\/td>\n<td class=\"feature\">\n<p>Electroless nickel is commonly used as a base layer. It is magnetic.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"material\">Gold (Au)<\/td>\n<td class=\"feature\">\n<p>Standard plating offering low resistance and stable performance (HV-150 to 200).<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"material\">Palladium (Pd)<\/td>\n<td class=\"feature\">\n<p>Harder than gold with a hardness around HV-500.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"material\">Others<\/td>\n<td class=\"feature\">\n<p>We also offer even harder options like rhodium (Rh), depending on your inspection conditions.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Probe Tip Shapes and Applications (Examples)<\/h3>\n<p>We offer various standard tip shapes and can also propose custom solutions based on your testing requirements.<\/p>\n<table class=\"table -usage\">\n<tr>\n<td class=\"img\"><img decoding=\"async\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/themes\/wp-seiken-en\/assets\/images\/products\/probe\/single_ended\/type_img01.png\" alt=\"\"><\/td>\n<td class=\"txt\">\n<p class=\"ttl\">Round (S\u3007-1 Series)<\/p>\n<p>Ideal for FPCs and cases where electrodes must not be damaged.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"img\"><img decoding=\"async\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/themes\/wp-seiken-en\/assets\/images\/products\/probe\/single_ended\/type_img02.png\" alt=\"\"><\/td>\n<td class=\"txt\">\n<p class=\"ttl\">Needle (S\u3007-2 Series)<\/p>\n<p>Suitable for precise inspections of PCB pads.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"img\"><img decoding=\"async\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/themes\/wp-seiken-en\/assets\/images\/products\/probe\/single_ended\/type_img03.png\" alt=\"\/ Reverse Cone\"><\/td>\n<td class=\"txt\">\n<p class=\"ttl\">Flat \/ Reverse Cone<br class=\"-sp\">(S\u3007-3 Series)<\/p>\n<p>Used for tests requiring even contact surfaces. Flat tips prevent electrode damage; reverse cones are effective for terminal sockets.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"img\"><img decoding=\"async\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/themes\/wp-seiken-en\/assets\/images\/products\/probe\/single_ended\/type_img04.png\" alt=\"\"><\/td>\n<td class=\"txt\">\n<p class=\"ttl\">Triangular Pyramid (S\u3007-4 Series)<\/p>\n<p>Ensures secure contact\u2014used for through-hole testing.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td class=\"img\"><img decoding=\"async\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/themes\/wp-seiken-en\/assets\/images\/products\/probe\/single_ended\/type_img05.png\" alt=\"\"><\/td>\n<td class=\"txt\">\n<p class=\"ttl\">Crown (S\u3007-5 Series)<\/p>\n<p>Provides stable multi-point contact\u2014great for BGA, ball terminals, and component leads.<\/p>\n<\/td>\n<\/tr>\n<\/table>\n<h4>We offer a variety of probe tip shapes to match your specific application. Contact us for tailored recommendations.<\/h4>\n<div class=\"lineup\">\n          <img decoding=\"async\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/themes\/wp-seiken-en\/assets\/images\/products\/probe\/single_ended\/lineup_img01.jpg\" alt=\"\"><br \/>\n          <img decoding=\"async\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/themes\/wp-seiken-en\/assets\/images\/products\/probe\/single_ended\/lineup_img02.jpg\" alt=\"\"><br \/>\n          <img decoding=\"async\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/themes\/wp-seiken-en\/assets\/images\/products\/probe\/single_ended\/lineup_img03.jpg\" alt=\"\"><br \/>\n          <img decoding=\"async\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/themes\/wp-seiken-en\/assets\/images\/products\/probe\/single_ended\/lineup_img04.jpg\" alt=\"\"><br \/>\n          <img decoding=\"async\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/themes\/wp-seiken-en\/assets\/images\/products\/probe\/single_ended\/lineup_img05.jpg\" alt=\"\"><br \/>\n          <img decoding=\"async\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/themes\/wp-seiken-en\/assets\/images\/products\/probe\/single_ended\/lineup_img06.jpg\" alt=\"\"><br \/>\n          <img decoding=\"async\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/themes\/wp-seiken-en\/assets\/images\/products\/probe\/single_ended\/lineup_img07.jpg\" alt=\"\"><br \/>\n          <img decoding=\"async\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/themes\/wp-seiken-en\/assets\/images\/products\/probe\/single_ended\/lineup_img08.jpg\" alt=\"\"><br \/>\n          <img decoding=\"async\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/themes\/wp-seiken-en\/assets\/images\/products\/probe\/single_ended\/lineup_img09.jpg\" alt=\"\"><br \/>\n          <img decoding=\"async\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/themes\/wp-seiken-en\/assets\/images\/products\/probe\/single_ended\/lineup_img10.jpg\" alt=\"\"><br \/>\n          <img decoding=\"async\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/themes\/wp-seiken-en\/assets\/images\/products\/probe\/single_ended\/lineup_img11.jpg\" alt=\"\"><br \/>\n          <img decoding=\"async\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/themes\/wp-seiken-en\/assets\/images\/products\/probe\/single_ended\/lineup_img12.jpg\" alt=\"\">\n        <\/div>\n<h3>Selecting Spring Load \/ Force\u200b<\/h3>\n<p>Each probe series offers various spring load options.<\/p>\n<h4>Choosing the Right Probe &#8211; e.g., from the SE Series\u200b<\/h4>\n<p>If you need a round tip with high force, we recommend the SE-1V(ED).\u200b<\/p>\n<div class=\"box -border--thin choice\">\n<figure><img decoding=\"async\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/themes\/wp-seiken-en\/assets\/images\/products\/probe\/single_ended\/choice_img01.jpg\" alt=\"\"><\/figure>\n<\/p><\/div>\n<div class=\"btn_wrap\">\n          <a href=\"..\/catalog_download\/\" class=\"btn\">Explore our catalog<\/a>\n        <\/div>\n<\/section>\n<section id=\"usage\" class=\"container\">\n<h2>How to Make the Most of Your Single-Ended Probes<\/h2>\n<p>Contact probes are inserted into sockets, which are fixed into resin holders. Only the worn-out probes need to be replaced, making maintenance simple and reducing long-term operating costs.<\/p>\n<ul class=\"list -note\">\n<li>Note: Handling ultra-fine probes requires advanced technical skill.<\/li>\n<li>Detailed usage guidelines are available on a separate page.<\/li>\n<\/ul>\n<div class=\"btn_wrap\">\n          <a href=\"..\/usage_guide\/\" class=\"btn\">View Details<\/a>\n        <\/div>\n<\/section>\n<section id=\"order\" class=\"container\">\n<h2>Get the Single-Ended Probes You Need<\/h2>\n<p>For orders over 50 pieces or for custom requests, please contact us through the inquiry page.<\/p>\n<div class=\"btn_wrap\">\n          <a href=\"..\/..\/..\/contact_us\/\" class=\"btn -contact\">Contact<\/a>\n        <\/div>\n<div class=\"box -border\">\n<h3>Small Lot Orders<\/h3>\n<p>Previously, a minimum order of 50 units was required. Now, you can purchase catalog products starting from a single piece via MiSUMi-VONA (Not all of our catalog probe are included). Perfect for one-off testing or trial use.<\/p>\n<div class=\"btn_wrap\">\n            <a href=\"https:\/\/jp.misumi-ec.com\/vona2\/maker\/seiken\/mech\/M0400000000\/M0414000000\/?DispMethod=dispPhoto&#038;refid=refid_seiken_pb_v-mech_01_01_sc040_20197\" target=\"_blank\" class=\"btn\">MiSUMi-VONA online shop<\/a>\n          <\/div>\n<\/p><\/div>\n<\/section>\n<section id=\"jig\" class=\"container\">\n<h2>Fixture Manufacturing<\/h2>\n<p>One-Stop Support for Inspection Fixtures<br \/>At Seiken, we provide more than just contact probes. We offer end-to-end solutions, including material machining, socket integration, and wiring. We also accept orders for machining alone.<br \/>\n          <br \/>Please feel free to reach out to us with any questions or requests.<\/p>\n<div class=\"link_wrap\">\n          <a href=\"..\/..\/test_fixtures\/probe_holder\/\" class=\"link\"><span>Probe Holders (Custom Test Fixtures)<\/span><\/a><br \/>\n          <a href=\"..\/..\/precision_machining\/\" class=\"link\"><span>Resin Processing<\/span><\/a>\n        <\/div>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Structure Types Details Orders Fixture Manufacturing The Structure of Single-Ended Probes Contact probes\u2014also  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":39,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-products-child.php","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-121","page","type-page","status-publish","hentry"],"aioseo_notices":[],"acf":[],"_links":{"self":[{"href":"https:\/\/www.seiken.co.jp\/english\/wp-json\/wp\/v2\/pages\/121","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.seiken.co.jp\/english\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.seiken.co.jp\/english\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.seiken.co.jp\/english\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.seiken.co.jp\/english\/wp-json\/wp\/v2\/comments?post=121"}],"version-history":[{"count":0,"href":"https:\/\/www.seiken.co.jp\/english\/wp-json\/wp\/v2\/pages\/121\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/www.seiken.co.jp\/english\/wp-json\/wp\/v2\/pages\/39"}],"wp:attachment":[{"href":"https:\/\/www.seiken.co.jp\/english\/wp-json\/wp\/v2\/media?parent=121"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}