Electroless nickel plating (ENP) is an autocatalytic chemical process in which nickel is deposited onto the fastener surface from a nickel-phosphorus solution without using electrical current. Unlike electroplating, ENP produces a perfectly uniform coating thickness across all geometries \u2014 including thread roots, recesses, and blind holes \u2014 making it the preferred choice for precision-threaded fasteners where dimensional control is critical.<\/p>\n
Asia Bolts Industries sources and applies ENP coatings per client specifications, with options across all three phosphorus grade categories:<\/p>\n
ENP Phosphorus Grade Options: <\/strong><\/p>\n \u2022 Low Phosphorus (2\u20135% P): Highest hardness (HV 600\u2013750 as-plated; up to HV 1100 post heat-treated); magnetic; excellent wear resistance<\/p>\n \u2022 Medium Phosphorus (6\u20139% P): Balance of hardness and corrosion resistance; semi-bright finish; most common grade<\/p>\n \u2022 High Phosphorus (10\u201313% P): Highest corrosion resistance; non-magnetic; amorphous structure; preferred for offshore and chemical process<\/p>\n Key ENP Properties: <\/strong><\/p>\n \u2022 Coating Uniformity: \u00b11\u20132 \u00b5m across all surfaces (vs \u00b110\u201330% variation with electroplating)<\/p>\n \u2022 Hardness: HV 500\u2013750 as-plated; up to HV 1000\u20131100 after heat treatment at 400\u00b0C<\/p>\n \u2022 Salt Spray: 500\u20131,000+ hours (high-P grade, 25 \u00b5m)<\/p>\n \u2022 Operating Temperature: Up to 350\u00b0C (low-P); 300\u00b0C (high-P without phase change)<\/p>\n \u2022 Magnetic Properties: Low-P is magnetic; High-P is non-magnetic<\/p>\n ENP is specified for subsea valve stem bolts, precision instrument fasteners, oil & gas wellhead studs, and bolts used in equipment where dimensional build-up from conventional plating is not acceptable. All ENP-coated fasteners from Asia Bolts are supplied with phosphorus content certification, coating thickness verification, and hardness test reports where specified<\/p>","protected":false},"excerpt":{"rendered":" Electroless nickel plating (ENP) applied to fasteners by autocatalytic chemical deposition \u2014 without electrical current. Produces a perfectly uniform coating thickness across all surfaces including threads, blind holes, and recesses. Available in low, medium, and high phosphorus grades. Widely specified in oil & gas, defence, and precision engineering.<\/p>\n\n\n
\n Standard<\/strong><\/td>\n Client \/ Project Specification; ASTM B733 referenced<\/td>\n<\/tr>\n \n Base Material<\/strong><\/td>\n Carbon Steel, Alloy Steel, Stainless Steel, Copper Alloy<\/td>\n<\/tr>\n \n Salt Spray<\/strong><\/td>\n 500\u20131,000+ hours (high-P grade)<\/td>\n<\/tr>\n \n Thickness<\/strong><\/td>\n 5\u201375 \u00b5m (uniform on all surfaces)<\/td>\n<\/tr>\n \n Applications<\/strong><\/td>\n Subsea wellhead, precision instruments, chemical process, oil & gas valve hardware<\/td>\n<\/tr>\n<\/tbody>\n<\/table>","protected":false},"featured_media":3661,"template":"","meta":{"_kadence_starter_templates_imported_post":false},"product_brand":[],"product_cat":[212],"product_tag":[217],"class_list":["post-3641","product","type-product","status-publish","has-post-thumbnail","product_cat-fastener-coatings-surface-treatments","product_tag-electroless-nickel-plated-fasteners-enp","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/asiabolt.om\/ar\/wp-json\/wp\/v2\/product\/3641","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/asiabolt.om\/ar\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/asiabolt.om\/ar\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/asiabolt.om\/ar\/wp-json\/wp\/v2\/media\/3661"}],"wp:attachment":[{"href":"https:\/\/asiabolt.om\/ar\/wp-json\/wp\/v2\/media?parent=3641"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/asiabolt.om\/ar\/wp-json\/wp\/v2\/product_brand?post=3641"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/asiabolt.om\/ar\/wp-json\/wp\/v2\/product_cat?post=3641"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/asiabolt.om\/ar\/wp-json\/wp\/v2\/product_tag?post=3641"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}