{"id":1280,"date":"2026-09-10T06:38:41","date_gmt":"2026-09-10T06:38:41","guid":{"rendered":"https:\/\/nmcouplings.top\/how-to-measure-coupling-bore-and-keyway\/"},"modified":"2026-09-10T06:38:41","modified_gmt":"2026-09-10T06:38:41","slug":"how-to-measure-coupling-bore-and-keyway","status":"publish","type":"post","link":"https:\/\/nmcouplings.top\/ar\/how-to-measure-coupling-bore-and-keyway\/","title":{"rendered":"\u0643\u064a\u0641\u064a\u0629 \u0642\u064a\u0627\u0633 \u062a\u062c\u0648\u064a\u0641 \u0648\u0635\u0644\u0629 \u0627\u0644\u062a\u0648\u0635\u064a\u0644 \u0648\u0645\u062c\u0631\u0649 \u0627\u0644\u0645\u0641\u062a\u0627\u062d"},"content":{"rendered":"

For a replacement coupling, \u201csame as the old one\u201d is not a dimension. Measure the shaft or use the equipment drawing. Do this on both sides; motor and driven shafts are often different.<\/p>\n

Record these dimensions<\/h2>\n
\n\n\n\n\n\n\n\n\n\n
\u063a\u0631\u0636<\/th>\n\u0645\u0627 \u0627\u0644\u0630\u064a \u064a\u062c\u0628 \u062a\u0623\u0643\u064a\u062f\u0647\u061f<\/th>\n<\/tr>\n<\/thead>\n
Shaft diameter<\/td>\nMeasure the actual shaft; note the unit and required fit if controlled.<\/td>\n<\/tr>\n
Keyway width and depth<\/td>\nUse the shaft drawing where possible. If measured, state that the values are field measurements.<\/td>\n<\/tr>\n
Hub length available<\/td>\nCheck shoulders, seals, guards and nearby equipment.<\/td>\n<\/tr>\n
Shaft end position<\/td>\nNote how far the shaft enters the hub and any axial gap requirement.<\/td>\n<\/tr>\n
Setscrew or locking detail<\/td>\nPhotograph and dimension it if the replacement must match an existing arrangement.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Why a photo is not enough<\/h2>\n

Perspective can make a 28 mm and 30 mm bore look identical, and an assembled guard can hide the hub length. Photos are excellent for identifying construction and damage; dimensions are what make the part fit.<\/p>\n

\n

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\u0623\u0631\u0633\u0644 \u0644\u0646\u0627 \u0645\u0642\u0627\u0633\u0627\u062a \u0627\u0644\u0639\u0645\u0648\u062f\u060c \u0648\u0627\u0644\u0633\u0631\u0639\u0629\u060c \u0648\u0627\u0644\u062d\u0645\u0644\u060c \u0648\u0627\u0644\u0643\u0645\u064a\u0629. \u0633\u0646\u0631\u0627\u062c\u0639 \u0627\u0644\u0637\u0631\u0627\u0632 \u0648\u062a\u0641\u0627\u0635\u064a\u0644 \u0627\u0644\u062a\u0635\u0646\u064a\u0639 \u0642\u0628\u0644 \u062a\u0642\u062f\u064a\u0645 \u0639\u0631\u0636 \u0627\u0644\u0633\u0639\u0631.<\/p>\n

\u0623\u0631\u0633\u0644 \u0637\u0644\u0628 \u0639\u0631\u0636 \u0623\u0633\u0639\u0627\u0631<\/a><\/div>","protected":false},"excerpt":{"rendered":"

\u0642\u0627\u0626\u0645\u0629 \u0642\u064a\u0627\u0633 \u0639\u0645\u0644\u064a\u0629 \u0644\u062b\u0642\u0648\u0628 \u0627\u0644\u062a\u0648\u0635\u064a\u0644\u060c \u0648\u0645\u062c\u0627\u0631\u064a \u0627\u0644\u0645\u0641\u0627\u062a\u064a\u062d\u060c \u0648\u0645\u0633\u0627\u062d\u0629 \u0627\u0644\u0645\u062d\u0648\u0631.<\/p>","protected":false},"author":1,"featured_media":1305,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1280","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/nmcouplings.top\/ar\/wp-json\/wp\/v2\/posts\/1280","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nmcouplings.top\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nmcouplings.top\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nmcouplings.top\/ar\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nmcouplings.top\/ar\/wp-json\/wp\/v2\/comments?post=1280"}],"version-history":[{"count":3,"href":"https:\/\/nmcouplings.top\/ar\/wp-json\/wp\/v2\/posts\/1280\/revisions"}],"predecessor-version":[{"id":1426,"href":"https:\/\/nmcouplings.top\/ar\/wp-json\/wp\/v2\/posts\/1280\/revisions\/1426"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nmcouplings.top\/ar\/wp-json\/wp\/v2\/media\/1305"}],"wp:attachment":[{"href":"https:\/\/nmcouplings.top\/ar\/wp-json\/wp\/v2\/media?parent=1280"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nmcouplings.top\/ar\/wp-json\/wp\/v2\/categories?post=1280"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nmcouplings.top\/ar\/wp-json\/wp\/v2\/tags?post=1280"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}