<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="//sk.optimum-federn.com/sitemap.xsl"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<url>
<lastmod>2026-04-22T14:41:59+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>1.0</priority>
<loc>https://sk.optimum-federn.com/</loc>
</url>
<url>
<lastmod>2026-04-27T05:42:47+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/our-history</loc>
</url>
<url>
<lastmod>2026-04-27T05:43:01+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/facility-overview</loc>
</url>
<url>
<lastmod>2026-04-27T05:43:01+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/pump</loc>
</url>
<url>
<lastmod>2026-04-27T05:42:55+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/busbar-connection</loc>
</url>
<url>
<lastmod>2026-04-27T05:43:02+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/spindle-tool-clamping</loc>
</url>
<url>
<lastmod>2026-04-27T05:42:48+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/company-overview</loc>
</url>
<url>
<lastmod>2026-04-27T05:42:47+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/force-or-load-or-torque-limiter</loc>
</url>
<url>
<lastmod>2026-04-27T05:42:59+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/flange-bolting</loc>
</url>
<url>
<lastmod>2026-04-27T05:43:02+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/propeller-shaft</loc>
</url>
<url>
<lastmod>2026-04-27T05:43:03+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/electrolyzers-and-fuel-cells</loc>
</url>
<url>
<lastmod>2026-04-27T05:42:50+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/spring-starter</loc>
</url>
<url>
<lastmod>2026-04-27T05:42:46+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/downhole-drilling</loc>
</url>
<url>
<lastmod>2026-04-27T05:43:09+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/spring-applied-disc-brake</loc>
</url>
<url>
<lastmod>2026-04-27T05:42:56+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/valve</loc>
</url>
<url>
<lastmod>2026-04-27T05:42:45+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/about-us</loc>
</url>
<url>
<lastmod>2026-04-27T05:42:49+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/contact-us</loc>
</url>
<url>
<lastmod>2026-04-27T05:42:43+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/inquiry</loc>
</url>
<url>
<lastmod>2026-04-27T05:42:55+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/info/</loc>
</url>
<url>
<lastmod>2026-04-27T05:42:48+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/products</loc>
</url>
<url>
<lastmod>2026-05-19T23:43:08+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/</loc>
</url>
<url>
<lastmod>2026-04-27T04:34:14+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/din-6796-spring/</loc>
</url>
<url>
<lastmod>2026-04-27T04:34:14+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/conical-spring-washer/</loc>
</url>
<url>
<lastmod>2026-04-27T04:34:14+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/trep-french-spring-washer/</loc>
</url>
<url>
<lastmod>2026-04-27T04:34:14+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/serrated-safety-washer/</loc>
</url>
<url>
<lastmod>2026-04-27T04:59:43+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/ball-bearing-disc-springs/</loc>
</url>
<url>
<lastmod>2026-04-27T04:59:43+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/flange-bolting-belleville-washer/</loc>
</url>
<url>
<lastmod>2026-04-27T04:59:43+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/nfe25511-french-serrated-spring-washer/</loc>
</url>
<url>
<lastmod>2026-04-27T04:59:58+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/disc-spring-din2093-en16983/</loc>
</url>
<url>
<lastmod>2026-04-27T05:03:24+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/flange-bolting-belleville-washer/15-7ph-flange-bolting-belleville-washer.html</loc>
</url>
<url>
<lastmod>2026-04-27T05:03:29+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/disc-spring-din2093-en16983/din-2093.html</loc>
</url>
<url>
<lastmod>2026-04-27T05:04:09+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/flange-bolting-belleville-washer/inconel-x750-flange-bolting-belleville-washer.html</loc>
</url>
<url>
<lastmod>2026-04-27T05:04:12+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/flange-bolting-belleville-washer/inconel-x718-flange-bolting-belleville-washer.html</loc>
</url>
<url>
<lastmod>2026-04-27T05:04:16+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/disc-spring-din2093-en16983/stainless-steel-disc-spring.html</loc>
</url>
<url>
<lastmod>2026-04-27T05:06:41+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/din-6796-spring/din-6796-heavy-duty-bolt-spring-washer.html</loc>
</url>
<url>
<lastmod>2026-04-27T05:07:00+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/ball-bearing-disc-springs/ball-bearing-disc-spring.html</loc>
</url>
<url>
<lastmod>2026-04-27T05:07:04+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/disc-spring-din2093-en16983/valve-disc-spring.html</loc>
</url>
<url>
<lastmod>2026-04-27T05:07:09+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/flange-bolting-belleville-washer/17-7ph-flange-bolting-belleville-washer.html</loc>
</url>
<url>
<lastmod>2026-04-27T05:07:09+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/flange-bolting-belleville-washer/h13-flange-bolting-belleville-washer.html</loc>
</url>
<url>
<lastmod>2026-04-27T05:07:28+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/conical-spring-washer/high-temperature-conical-spring-washer.html</loc>
</url>
<url>
<lastmod>2026-04-27T05:07:31+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/disc-spring-din2093-en16983/high-temperature-disc-spring.html</loc>
</url>
<url>
<lastmod>2026-04-27T05:42:35+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/serrated-safety-washer/serrate-safety-washer.html</loc>
</url>
<url>
<lastmod>2026-04-27T05:42:37+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/trep-french-spring-washer/trep-french-spring-washers.html</loc>
</url>
<url>
<lastmod>2026-04-27T05:42:37+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/nfe25511-french-serrated-spring-washer/nfe25511-french-serrated-spring-washers.html</loc>
</url>
<url>
<lastmod>2026-04-27T05:42:40+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/conical-spring-washer/stainless-steel-conical-spring-washer.html</loc>
</url>
<url>
<lastmod>2026-05-28T09:31:55+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/info/disc-springs-in-welding-gas-regulators-17892041303565312.html</loc>
</url>
<url>
<lastmod>2026-05-25T09:14:00+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/info/application-of-disc-springs-in-coke-oven-door-17887935653159936.html</loc>
</url>
<url>
<lastmod>2026-05-22T10:35:05+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/info/disc-springs-maintain-clamping-stability-in-17883770858595328.html</loc>
</url>
<url>
<lastmod>2026-05-19T11:51:08+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/info/disc-springs-in-vibrating-screens-17879435724841984.html</loc>
</url>
<url>
<lastmod>2026-05-19T11:51:08+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/info/downholder-with-disc-spring-in-riveting-machin-17879435720631296.html</loc>
</url>
<url>
<lastmod>2026-05-09T16:22:21+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/info/disc-springs-for-electromechanical-swing-clamp-17865537376297984.html</loc>
</url>
<url>
<lastmod>2026-05-06T20:19:37+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/info/disc-spring-stacks-for-holding-down-device-17861525538350080.html</loc>
</url>
<url>
<lastmod>2026-05-06T20:19:28+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/info/force-limiter-with-disc-spring-17861525529535488.html</loc>
</url>
<url>
<lastmod>2026-05-06T20:19:37+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/info/buffer-spring-washers-in-buffer-assembly-17861525496013824.html</loc>
</url>
<url>
<lastmod>2026-05-06T20:19:37+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/info/disc-springs-for-hydraulic-spring-return-actua-17861525477401600.html</loc>
</url>
<url>
<lastmod>2026-05-06T20:19:27+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/info/disc-spring-stacks-for-heat-expansion-compensa-17861525468521472.html</loc>
</url>
<url>
<lastmod>2026-05-06T20:19:23+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/info/disk-springs-for-slide-hub-17861525435048960.html</loc>
</url>
<url>
<lastmod>2026-04-27T09:46:09+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/info/torque-limiter-with-belleville-spring-17861525422007296.html</loc>
</url>
<url>
<lastmod>2026-04-22T06:18:44+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/info/high-pressure-steam-safety-valve-with-disc-spr-17847903210087424.html</loc>
</url>
<url>
<lastmod>2026-05-11T14:01:35+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.8</priority>
<loc>https://sk.optimum-federn.com/info/disc-springs-in-core-shooting-machines-17871812462420992.html</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/15-7ph-flange-bolting-br-belleville-washer/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/17-7ph-flange-bolting-br-belleville-washer/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/ball-bearing-disc-spring/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/conical-spring-washer/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/din-6796-heavy-duty-bolt-spring-washer/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/din-6796-heavy-duty-br-bolt-spring-washer/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/disc-spring-din2093-en16983/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/disc-spring-din2093-en16983/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/en16983-spring-steel-disc-spring/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/flange-bolting-belleville-washer/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/h13-flange-bolting-br-belleville-washer/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/high-temperature-br-conical-spring-washer/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/high-temperature-disc-spring/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/inconel-x718-flange-bolting-br-belleville-washer/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/inconel-x750-flange-bolting-br-belleville-washer/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/nfe25511-french-br-serrated-spring-washers/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/nfe25511-french-serrated-spring-washers/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/serrated-safety-washer/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/serrated-safety-washers/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/stainless-steel-br-conical-spring-washer/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/stainless-steel-disc-spring/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/trep-french-spring-washers/</loc>
</url>
<url>
<lastmod>2026-06-05T16:59:17+08:00</lastmod>
<changefreq>weekly</changefreq>
<priority>0.9</priority>
<loc>https://sk.optimum-federn.com/showroom/valve-disc-spring/</loc>
</url>
</urlset>