{"id":1960,"date":"2026-03-04T07:20:05","date_gmt":"2026-03-04T07:20:05","guid":{"rendered":"https:\/\/henghuahose.com\/?post_type=product&#038;p=1960"},"modified":"2026-06-07T12:55:36","modified_gmt":"2026-06-07T12:55:36","slug":"sae-100-r4-hydraulic-hose","status":"publish","type":"product","link":"https:\/\/www.henghuahose.com\/ar\/product\/sae-100-r4-hydraulic-hose\/","title":{"rendered":"SAE 100 R4 Hydraulic Hose"},"content":{"rendered":"<p class=\"ds-markdown-paragraph\">SAE 100 R4 hydraulic hose\u00a0is a textile-reinforced, heavy-duty rubber hose specifically engineered for oil suction and return applications in hydraulic systems. Unlike high-pressure wire braided hoses used for pressure lines, the\u00a0sae 100 r4 hose\u00a0is designed to handle vacuum (suction) and low-pressure return, utilizing a robust helix wire to prevent collapse. As a leading\u00a0china manufacturer\u00a0and\u00a0supplier, we provide\u00a0sae 100 r4 standard\u00a0compliant hoses that serve as the critical link in hydraulic reservoirs, ensuring system longevity and reliability. Whether you are looking to\u00a0buy\u00a0individual lengths or\u00a0bulk\u00a0reels for\u00a0OEM ODM\u00a0projects, understanding the\u00a0definition\u00a0and\u00a0specification\u00a0of this\u00a0rubber hose\u00a0is essential for optimal system performance.<\/p>\n<h2>Product Overview<\/h2>\n<p class=\"ds-markdown-paragraph\">The SAE 100 R4 hydraulic hose is a specialized\u00a0rubber hose\u00a0designed as the industry\u00a0standard\u00a0for low-pressure hydraulic return and suction lines. Its\u00a0definition\u00a0is rooted in the\u00a0sae 100 r4 standard, which specifies a hose with a smooth bore and a construction capable of withstanding full vacuum. This hose is composed of three distinct layers: an oil-resistant synthetic rubber tube, a textile reinforcement layer with an integral helix steel wire, and a weather-resistant synthetic rubber cover.<\/p>\n<p class=\"ds-markdown-paragraph\">A key performance highlight is its ability to maintain integrity under full vacuum conditions, preventing the hose from collapsing during pump suction. The working temperature range of -40\u00b0C to +100\u00b0C ensures reliable\u00a0service\u00a0in diverse climates. The core advantages of the SAE100 R4 include its robust collapse resistance provided by the helix wire, excellent flexibility for tight installations, superior abrasion and weather resistance, and compatibility with standard hydraulic oils. This hose is the go-to\u00a0solution\u00a0for connecting reservoirs to pumps in heavy machinery, providing dependable\u00a0support\u00a0for continuous operation. With rigorous quality control, every hose meets the durability demands of modern hydraulic systems.<\/p>\n<h2>Product Advantages<\/h2>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Superior Collapse Resistance:<\/strong>\u00a0The integral helix steel wire within the textile reinforcement provides the structural rigidity required for oil suction\u00a0<strong>service<\/strong>, preventing the hose from collapsing under vacuum pressure and ensuring consistent flow.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Exceptional Flexibility for Easy Routing:<\/strong>\u00a0Despite its robust internal wire, the SAE100 R4 maintains excellent flexibility, allowing for easier\u00a0assembly\u00a0and installation in confined spaces compared to rigid piping or heavy\u00a0wire spiral hose.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Comprehensive Environmental Protection:<\/strong>\u00a0The high-quality synthetic rubber\u00a0cover\u00a0is engineered to resist abrasion, corrosion, weather, ozone, and aging. This extends the\u00a0rubber hose&#8217;s\u00a0lifespan in harsh outdoor or industrial environments.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Reliable Long-Term Performance:<\/strong>\u00a0Designed for continuous use in low-pressure return and suction applications, this hose provides a durable and reliable\u00a0<strong>solution<\/strong>\u00a0that minimizes downtime and reduces replacement\u00a0cost.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Applicable Users:<\/strong>\u00a0Ideal for\u00a0distributors,\u00a0wholesalers, and engineering companies requiring a dependable\u00a0high pressure hose\u00a0(for the return side) for heavy equipment. It is widely used in construction, mining, and agricultural machinery.<\/p>\n<\/li>\n<\/ul>\n<h2>Detailed Technical Specifications Table<\/h2>\n<p class=\"ds-markdown-paragraph\">This table provides the detailed\u00a0specification\u00a0for the SAE 100 R4\u00a0hydraulic hose, based on the\u00a0sae 100r4 hose specifications\u00a0and the\u00a0sae 100 r4 standard pdf. It includes all necessary data for proper selection, including dash size, dimensions, and pressure ratings.<\/p>\n<table class=\"table\">\n<caption><strong>The specification of SAE 100 R4 textile reinforced hydraulic hose (1)<\/strong><\/caption>\n<tbody>\n<tr>\n<th rowspan=\"2\">Hose code<\/th>\n<th colspan=\"2\">Size<\/th>\n<th rowspan=\"2\">Dash size<\/th>\n<th colspan=\"2\">ID<\/th>\n<th>OD<\/th>\n<\/tr>\n<tr>\n<th>mm<\/th>\n<th>inch<\/th>\n<th>min<\/th>\n<th>max<\/th>\n<th>max<\/th>\n<\/tr>\n<tr>\n<th>SAE100R4-01<\/th>\n<td>19<\/td>\n<td>3\/4<\/td>\n<td>-12<\/td>\n<td>18.2<\/td>\n<td>19.8<\/td>\n<td>34.9<\/td>\n<\/tr>\n<tr>\n<th>SAE100R4-02<\/th>\n<td>25<\/td>\n<td>1<\/td>\n<td>-16<\/td>\n<td>24.6<\/td>\n<td>26.2<\/td>\n<td>41.3<\/td>\n<\/tr>\n<tr>\n<th>SAE100R4-03<\/th>\n<td>31.5<\/td>\n<td>1-1\/4<\/td>\n<td>-20<\/td>\n<td>30.6<\/td>\n<td>33<\/td>\n<td>50.8<\/td>\n<\/tr>\n<tr>\n<th>SAE100R4-04<\/th>\n<td>38<\/td>\n<td>1-1\/2<\/td>\n<td>-24<\/td>\n<td>36.9<\/td>\n<td>39.3<\/td>\n<td>57.2<\/td>\n<\/tr>\n<tr>\n<th>SAE100R4-05<\/th>\n<td>51<\/td>\n<td>2<\/td>\n<td>-32<\/td>\n<td>49.2<\/td>\n<td>52.4<\/td>\n<td>69.9<\/td>\n<\/tr>\n<tr>\n<th>SAE100R4-06<\/th>\n<td>63<\/td>\n<td>2-1\/2<\/td>\n<td>-40<\/td>\n<td>61.9<\/td>\n<td>65.1<\/td>\n<td>82.6<\/td>\n<\/tr>\n<tr>\n<th>SAE100R4-07<\/th>\n<td>76<\/td>\n<td>3<\/td>\n<td>-48<\/td>\n<td>74.6<\/td>\n<td>77.8<\/td>\n<td>95.3<\/td>\n<\/tr>\n<tr>\n<th>SAE100R4-08<\/th>\n<td>89<\/td>\n<td>3-1\/2<\/td>\n<td>-56<\/td>\n<td>87.3<\/td>\n<td>90.5<\/td>\n<td>107.9<\/td>\n<\/tr>\n<tr>\n<th>SAE100R4-09<\/th>\n<td>102<\/td>\n<td>4<\/td>\n<td>-64<\/td>\n<td>100<\/td>\n<td>103.2<\/td>\n<td>120.7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table class=\"table\">\n<caption><strong>The specification of SAE 100 R4 textile reinforced hydraulic hose (2)<\/strong><\/caption>\n<tbody>\n<tr>\n<th rowspan=\"2\">Hose code<\/th>\n<th colspan=\"2\">Working pressure<\/th>\n<th colspan=\"2\">Proof pressure<\/th>\n<th colspan=\"2\">Min burst pressure<\/th>\n<th>Min bending radius<\/th>\n<th>Weight<\/th>\n<\/tr>\n<tr>\n<th>MPa<\/th>\n<th>psi<\/th>\n<th>MPa<\/th>\n<th>psi<\/th>\n<th>MPa<\/th>\n<th>psi<\/th>\n<th>mm<\/th>\n<th>kg\/m<\/th>\n<\/tr>\n<tr>\n<th>SAE100R4-01<\/th>\n<td>2.1<\/td>\n<td>305<\/td>\n<td>4.2<\/td>\n<td>610<\/td>\n<td>8.4<\/td>\n<td>1210<\/td>\n<td>125<\/td>\n<td>0.92<\/td>\n<\/tr>\n<tr>\n<th>SAE100R4-02<\/th>\n<td>1.7<\/td>\n<td>250<\/td>\n<td>3.5<\/td>\n<td>510<\/td>\n<td>7<\/td>\n<td>1015<\/td>\n<td>150<\/td>\n<td>1.10<\/td>\n<\/tr>\n<tr>\n<th>SAE100R4-03<\/th>\n<td>1.4<\/td>\n<td>200<\/td>\n<td>2.8<\/td>\n<td>410<\/td>\n<td>5.6<\/td>\n<td>810<\/td>\n<td>200<\/td>\n<td>1.30<\/td>\n<\/tr>\n<tr>\n<th>SAE100R4-04<\/th>\n<td>1.05<\/td>\n<td>150<\/td>\n<td>2.1<\/td>\n<td>305<\/td>\n<td>4.2<\/td>\n<td>610<\/td>\n<td>255<\/td>\n<td>1.80<\/td>\n<\/tr>\n<tr>\n<th>SAE100R4-05<\/th>\n<td>0.7<\/td>\n<td>100<\/td>\n<td>1.4<\/td>\n<td>200<\/td>\n<td>2.8<\/td>\n<td>410<\/td>\n<td>300<\/td>\n<td>2.23<\/td>\n<\/tr>\n<tr>\n<th>SAE100R4-06<\/th>\n<td>0.4<\/td>\n<td>60<\/td>\n<td>0.85<\/td>\n<td>120<\/td>\n<td>1.7<\/td>\n<td>250<\/td>\n<td>355<\/td>\n<td>3.23<\/td>\n<\/tr>\n<tr>\n<th>SAE100R4-07<\/th>\n<td>0.4<\/td>\n<td>60<\/td>\n<td>0.8<\/td>\n<td>120<\/td>\n<td>1.6<\/td>\n<td>230<\/td>\n<td>460<\/td>\n<td>4.25<\/td>\n<\/tr>\n<tr>\n<th>SAE100R4-08<\/th>\n<td>0.3<\/td>\n<td>40<\/td>\n<td>0.6<\/td>\n<td>90<\/td>\n<td>1.25<\/td>\n<td>180<\/td>\n<td>530<\/td>\n<td>5.05<\/td>\n<\/tr>\n<tr>\n<th>SAE100R4-09<\/th>\n<td>0.25<\/td>\n<td>40<\/td>\n<td>0.5<\/td>\n<td>70<\/td>\n<td>1<\/td>\n<td>145<\/td>\n<td>610<\/td>\n<td>5.60<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"ds-markdown-paragraph\"><em>Note: For the complete\u00a0sae 100 standard pdf, including all performance criteria, please contact our sales team.<\/em><\/p>\n<h2>Structure and Materials<\/h2>\n<p class=\"ds-markdown-paragraph\">The performance and reliability of the\u00a0<strong>sae 100 r4 hose<\/strong>\u00a0are a direct result of its precisely engineered construction. Each layer plays a critical role in ensuring the hose meets the demanding\u00a0<strong>sae 100r4 hose specifications<\/strong>.<\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Tube (Inner Layer):<\/strong>\u00a0The tube is made from high-quality, smooth, black, oil-resistant synthetic rubber. This material is specifically formulated to be compatible with standard hydraulic fluids, ensuring minimal flow resistance and preventing fluid degradation.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Reinforcement (Middle Layer):<\/strong>\u00a0This layer consists of one or multiple plies of high-strength braided textile combined with a helix steel wire. The textile provides structural integrity, while the helix wire acts as a rigid skeleton, giving the hose its crucial ability to withstand full vacuum without collapsing.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Cover (Outer Layer):<\/strong>\u00a0The cover is a high-quality synthetic rubber designed for maximum protection. It is resistant to abrasion, corrosion, weather, ozone, and cutting, safeguarding the internal reinforcement from environmental damage and extending the hose&#8217;s service life.<\/p>\n<\/li>\n<\/ul>\n<h2>Application Industries<\/h2>\n<p class=\"ds-markdown-paragraph\">The SAE 100 R4\u00a0hydraulic hose\u00a0is a versatile component found across numerous industries. Its primary function is to safely and efficiently transfer hydraulic fluid in the return and suction lines of various systems.<\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Construction Equipment:<\/strong>\u00a0Used as suction and return lines in excavators, loaders, and backhoes. It connects the hydraulic tank to the pump, ensuring a steady\u00a0<strong>supply<\/strong>\u00a0of oil.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Agricultural Machinery:<\/strong>\u00a0Essential for tractors, combines, and sprayers, where it handles large volumes of oil in open-center hydraulic systems.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Material Handling:<\/strong>\u00a0Employed in forklifts and pallet jacks for the return oil path in their lifting circuits.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Industrial Manufacturing:<\/strong>\u00a0Used in large presses, injection molding machines, and machine tools as return lines to the reservoir.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Mining Equipment:<\/strong>\u00a0Its durable cover makes it suitable for underground mining applications where resistance to abrasion is critical.<\/p>\n<\/li>\n<\/ul>\n<h3>Precise Selection &amp; Professional Guide<\/h3>\n<p class=\"ds-markdown-paragraph\">Choosing the correct\u00a0sae 100 r4 hose\u00a0and completing it with the right fittings is crucial for system integrity. We offer complete\u00a0hose assembly\u00a0services and components to ensure a leak-free, reliable\u00a0solution.<\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Hose Assembly Solutions:<\/strong>\u00a0We provide custom-made\u00a0hose assemblies\u00a0tailored to your exact specifications. Our process utilizes precision cutting, skiving, and\u00a0crimped fittings\u00a0to create a permanent, leak-proof bond. This pre-made\u00a0assembly\u00a0eliminates the guesswork and potential errors of field assembly, ensuring a higher quality and longer-lasting product.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Fittings and Accessories:<\/strong>\u00a0A wide range of connection types are available to complete your system.<\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Crimped Fittings:<\/strong>\u00a0Permanent fittings installed with our calibrated crimping machines for a secure, factory-quality finish.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Reusable Fittings:<\/strong>\u00a0For field repairs and situations where a crimper is not available, we offer a selection of\u00a0reusable fittings.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Adapters and Flanges:<\/strong>\u00a0We stock a comprehensive range of\u00a0adapters\u00a0and\u00a0flanges\u00a0to connect the hose to various system ports and components.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Protective Sleeves and Guards:<\/strong>\u00a0To extend the life of your hose in abrasive environments, we offer various\u00a0protective sleeves\u00a0and\u00a0guards.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>SAE 100 R4 vs. Other Hoses:<\/strong>\u00a0Unlike\u00a0wire braided hose\u00a0or\u00a0wire spiral hose\u00a0designed for high-pressure applications, the\u00a0sae 100 r4\u00a0is a low-pressure, suction-specific hose. It should not be used as a substitute for a\u00a0high pressure hose\u00a0in pressure lines. It is the correct choice specifically for the suction side of the pump and return lines to the tank.<\/p>\n<\/li>\n<\/ul>\n<h2>Technical Standards and Certifications<\/h2>\n<p class=\"ds-markdown-paragraph\">Our SAE 100 R4\u00a0hydraulic hose\u00a0is manufactured in strict compliance with international standards, guaranteeing performance and safety.<\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>SAE J517 &amp; SAE 100R4:<\/strong>\u00a0The hose fully meets the dimensional and performance requirements of the\u00a0sae 100 r4 standard, ensuring global interchangeability.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>ISO 1436:<\/strong>\u00a0This hose also conforms to the relevant parts of ISO 1436, the international standard for rubber hoses and hose assemblies for hydraulic fluids.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Testing &amp; Quality:<\/strong>\u00a0As a reliable\u00a0manufacturer\u00a0and\u00a0factory, we perform routine impulse, burst, and vacuum tests to validate the\u00a0specification\u00a0of every production batch, ensuring you receive a product that performs as promised.<\/p>\n<\/li>\n<\/ul>\n<h2>Brand and Quality Assurance<\/h2>\n<p class=\"ds-markdown-paragraph\">As a premier\u00a0china factory\u00a0and\u00a0producer, we are committed to delivering excellence in every\u00a0rubber hose\u00a0we manufacture. Our quality assurance process begins with the raw materials. We rigorously inspect all incoming synthetic rubber and steel wire against strict chemical and physical property benchmarks. During production, our online process controls monitor critical parameters like wall thickness and reinforcement tension. Every single hose is subjected to a proof pressure test before leaving the\u00a0factory\u00a0to ensure immediate integrity. Furthermore, our in-house laboratory is equipped with advanced testing equipment, including a burst test stand and aging ovens, to continuously verify that our hoses meet or exceed the\u00a0sae 100 r4 hose specifications. This commitment to quality provides our customers with a traceable, reliable, and long-lasting product.<\/p>\n<h2>Installation, Operation, and Maintenance Guide<\/h2>\n<p class=\"ds-markdown-paragraph\">To maximize the\u00a0service\u00a0life of your SAE 100 R4\u00a0hydraulic hose, follow these best practices:<\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Installation:<\/strong>\u00a0Ensure the hose is not twisted during installation, as this can reduce its ability to withstand pressure and vacuum. Use appropriate\u00a0hose assembly\u00a0techniques with correct\u00a0crimped fittings\u00a0or\u00a0reusable fittings. Always respect the minimum bend radius listed in the specifications; tighter bends can kink the hose or damage the helix wire.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Operation:<\/strong>\u00a0Operate the hose strictly within its specified working pressure and temperature range. Protect the hose from sharp objects, excessive heat sources, and heavy impact. For outdoor applications, the cover is ozone and weather-resistant, but regular inspection is still recommended.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Maintenance:<\/strong>\u00a0Regularly inspect the hose\u00a0cover\u00a0for cuts, abrasion, or signs of weathering. Check the hose for kinking, crushing, or soft spots that may indicate internal damage. Ensure fittings are tight and free from corrosion. Replace any hose showing signs of wear or damage immediately.<\/p>\n<\/li>\n<\/ul>\n<h3>Frequently Asked Questions (FAQ)<\/h3>\n<p class=\"ds-markdown-paragraph\"><strong>Q: What is the difference between SAE 100 R4 and SAE 100 R16?<\/strong><br \/>\n<strong>A:<\/strong>\u00a0The primary difference is their application and construction.\u00a0SAE 100 R4\u00a0is a textile-reinforced hose with a helix wire, specifically designed for\u00a0suction and return lines\u00a0where collapse resistance is needed. SAE 100 R16 is a compact, high-pressure\u00a0wire braided hose\u00a0used in pressure lines. They are not interchangeable.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Q: Can I use this hose for high-pressure applications?<\/strong><br \/>\n<strong>A:<\/strong>\u00a0No. The SAE 100 R4 is designed for low-pressure return and suction lines. Using it in a high-pressure circuit would be extremely dangerous and lead to immediate failure. For high-pressure lines, you would need a\u00a0high pressure hose\u00a0like\u00a0wire braided hose\u00a0or\u00a0wire spiral hose.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Q: What is the &#8220;helix wire&#8221; and why is it important?<\/strong><br \/>\n<strong>A:<\/strong>\u00a0The helix wire is a steel wire that is spirally wound within the textile reinforcement layer. Its function is to act as a skeleton, providing the hose with enough rigidity to resist the vacuum created by the hydraulic pump on the suction line, preventing the hose from collapsing.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Q: Where can I find the\u00a0sae 100 r4 standard pdf\u00a0for download?<\/strong><br \/>\n<strong>A:<\/strong>\u00a0While the official SAE\u00a0standard\u00a0is a copyrighted document available for purchase from SAE International, we can provide a technical data sheet summarizing all the key\u00a0specifications\u00a0and dimensions of our hose, which is manufactured to meet that\u00a0standard. Please contact us to request a copy.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Q: Can I get custom lengths and pre-attached\u00a0crimped fittings?<\/strong><br \/>\n<strong>A:<\/strong>\u00a0Absolutely. As a full-service\u00a0supplier, we offer custom\u00a0hose assembly\u00a0services. You can provide your specifications, and we will cut the hose to length, apply the correct\u00a0crimped fittings\u00a0or\u00a0reusable fittings, and pressure-test the complete\u00a0assembly\u00a0before shipping.<\/p>\n<p class=\"ds-markdown-paragraph\">Ensure the reliability of your hydraulic systems with our premium\u00a0SAE 100 R4 hydraulic hose. Whether you are a\u00a0distributor\u00a0looking for a reliable\u00a0wholesale\u00a0partner, an OEM needing custom assemblies, or an engineer with a specific project, we have the\u00a0solution. Contact us today for a competitive\u00a0price\u00a0or\u00a0discount\u00a0on\u00a0bulk\u00a0orders. Let us be your trusted\u00a0source\u00a0for high-quality\u00a0rubber hose\u00a0and expert\u00a0service.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Contact Us for a Quote or Technical Support<\/strong><\/p>","protected":false},"excerpt":{"rendered":"<p>SAE 100 R4 hydraulic hose\u00a0is a textile-reinforced, heavy-duty rubber hose specifically engineered for oil suction and return applications in hydraulic systems. Unlike high-pressure wire braided hoses used for pressure lines, the\u00a0sae 100 r4 hose\u00a0is designed to handle vacuum (suction) and low-pressure return, utilizing a robust helix wire to prevent collapse. 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