{"id":2482,"date":"2026-09-11T03:49:10","date_gmt":"2026-09-11T03:49:10","guid":{"rendered":"https:\/\/www.sino-alloy.com\/clamp\/product\/phenolic-laminate-support-bar-u-bolt\/"},"modified":"2026-09-11T03:49:10","modified_gmt":"2026-09-11T03:49:10","slug":"phenolic-laminate-support-bar-u-bolt","status":"publish","type":"product","link":"https:\/\/www.sino-alloy.com\/clamp\/product\/phenolic-laminate-support-bar-u-bolt\/","title":{"rendered":"Phenolic Laminate Support-Bar U-Bolt Assembly"},"content":{"rendered":"

Phenolic laminate support-bar U-bolt assemblies<\/strong> combine a round-bend U-bolt, a machined cotton-fabric phenolic laminate support bar, isolating sleeves or washers, and project-specified nuts to locate or restrain piping on structural steel. SINO-ALLOY manufactures these insulated U-bolt pipe-support assemblies to an approved drawing or applicable bent-bolt standard. The rigid laminate bar separates the pipe-support interface from the steel mounting surface and can be machined for the required hole centres, profile, thickness, and edge detail. U-bolt material, coating, sleeve system, support function, and hardware are selected for the service environment. Actual pipe outside diameter, dimensional stack-up, loads, movement, temperature, and material grade must be confirmed for every quotation.<\/p>\n

Product at a Glance<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
Selection item<\/th>\nAvailable configuration<\/th>\nWhat the buyer must define<\/th>\n<\/tr>\n<\/thead>\n
Product type<\/td>\nInsulated U-bolt pipe support with a machined phenolic laminate support bar<\/td>\nGrip, hold-down, guide, or location function; the piping\/support drawing governs<\/td>\n<\/tr>\n
U-bolt form<\/td>\nRound bend or another drawing-defined bent-bolt form<\/td>\nRod diameter, inside width, bend radius, leg length, thread length, and tolerances<\/td>\n<\/tr>\n
U-bolt material<\/td>\nCarbon steel, stainless steel, or alloy steel, subject to project review<\/td>\nMaterial standard, grade\/class, heat treatment, testing, traceability, and marking<\/td>\n<\/tr>\n
Support bar<\/td>\nCotton-fabric phenolic laminate machined from specified sheet or block<\/td>\nExact material designation, thickness, width, length, hole centres, profile, and acceptance data<\/td>\n<\/tr>\n
Isolation components<\/td>\nProject-specified elastomer or polymer sleeve and isolating washers<\/td>\nMaterial, hardness or grade, thickness, coverage, temperature, wear, and chemical compatibility<\/td>\n<\/tr>\n
Surface protection<\/td>\nCoating system selected for the U-bolt and compatible hardware<\/td>\nPretreatment, coating family, film build, colour, cure, thread allowance, and inspection<\/td>\n<\/tr>\n
Typical applications<\/td>\nMarine, offshore, process, utility, and industrial pipe-support assemblies<\/td>\nPipe metallurgy, corrosion environment, temperature, movement, vibration, loads, and installation details<\/td>\n<\/tr>\n
Supply format<\/td>\nComplete custom assembly or drawing-defined component set<\/td>\nBill of materials, nut\/washer arrangement, quantity, packing, and documentation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Customization Note:<\/strong> The entries above describe configurable supply options, not a universal stock range, certified material grade, or safe working load. SINO-ALLOY finalizes the assembly against the approved drawing, actual pipe outside diameter, support-steel geometry, design reactions, movement case, operating environment, and purchase specification.<\/p>\n

What Is the Phenolic Laminate Support Bar?<\/h2>\n

The brown load-spreading component is a machined rigid laminate, not a wooden block and not the same material as a thermoplastic half-round rod. Cotton-fabric phenolic laminate is made from layers of woven cotton reinforcement bonded with a thermosetting phenolic resin. Applicable material families can be specified through IEC 60893-3-4, ASTM D709, a NEMA LI 1 grade, or another purchaser-approved material specification. The exact designation matters because reinforcement weave, resin system, moisture response, mechanical properties, electrical behavior, and temperature capability vary between grades.<\/p>\n

In this assembly the bar provides a defined mounting surface and spreads the fastener reaction across the support interface. It may also contribute to separation between coated metallic components and support steel. It is not automatically a certified electrical isolator, fire-rated component, cryogenic support, or low-friction slide. Those functions require material data, geometry, testing, and complete-system approval for the stated service.<\/p>\n

Representative Material Data and Its Limits<\/h2>\n

The values below are included only to show why a named laminate grade and supplier data sheet are necessary. They are typical values published by one manufacturer for a medium-weave cotton phenolic laminate identified as BS EN 60893-3-4 PFCC201\/PFCC203. They are not SINO-ALLOY guaranteed values and do not describe every phenolic laminate support bar.<\/p>\n

\n\n\n\n\n\n\n\n\n\n
Property<\/th>\nPublished typical reference<\/th>\nProcurement implication<\/th>\n<\/tr>\n<\/thead>\n
Density<\/td>\n1.35 g\/cm\u00b3<\/td>\nUse the approved grade and actual dimensions when calculating component mass.<\/td>\n<\/tr>\n
Flexural strength<\/td>\n120 MPa<\/td>\nDo not use a sheet-data value as an assembly load rating; hole geometry, span, bearing, and environment also matter.<\/td>\n<\/tr>\n
Tensile strength<\/td>\n80 MPa<\/td>\nDirection, machining, stress concentration, and lot data must be considered.<\/td>\n<\/tr>\n
Water absorption<\/td>\n100 mg under the supplier’s stated test basis<\/td>\nConfirm conditioning, test method, sealing, drainage, and exposure for wet or marine service.<\/td>\n<\/tr>\n
Thermal rating<\/td>\n115\u00b0C continuous; 125\u00b0C intermittent<\/td>\nThese are supplier-typical material references, not an assembly service-temperature guarantee.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Customization Note:<\/strong> Final material acceptance must use the ordered designation, current data sheet, test methods, tolerances, conditioning, and project acceptance criteria. U-bolt coating, sleeve, washers, adhesives if any, pipe coating, and support steel can set lower service limits than the laminate itself.<\/p>\n

How This Assembly Differs from a Half-Round Thermoplastic Support<\/h2>\n

A phenolic laminate support bar is a machined structural interface with bolt holes and a drawing-defined bearing profile. By contrast, SINO-ALLOY’s acetal half-round U-bolt support<\/a> uses a thermoplastic rod beneath the pipe to reduce the water-trapping contact area. The two products should not be treated as interchangeable merely because both are non-metallic support components.<\/p>\n

\n\n\n\n\n\n\n\n\n
Interface option<\/th>\nPrimary selection question<\/th>\nImportant limitation<\/th>\n<\/tr>\n<\/thead>\n
Cotton-fabric phenolic laminate bar<\/td>\nIs a rigid, machinable, drawing-specific support and isolation component required?<\/td>\nSpecify grade, grain\/weave considerations, machining, moisture exposure, bearing area, and temperature.<\/td>\n<\/tr>\n
POM\/acetal half-round rod<\/td>\nIs a narrow thermoplastic pipe-contact profile required?<\/td>\nConfirm polymer grade, contact stress, creep, temperature, ultraviolet exposure, and attachment method.<\/td>\n<\/tr>\n
PTFE pad or sleeve<\/td>\nIs a low-friction or chemically resistant contact surface required?<\/td>\nPTFE selection does not by itself define guide clearance, load capacity, or wear life.<\/td>\n<\/tr>\n
Elastomer sleeve or lining<\/td>\nIs cushioning, coating protection, or metal separation required around the U-bolt?<\/td>\nSpecify elastomer type, hardness, compression, ageing, fluid compatibility, and coverage.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

SINO-ALLOY also supplies Xylan-coated U-bolts with thermoplastic half-round supports<\/a>. A coating colour or brown support component is not reliable material identification; drawings, material certificates, and inspection records should control the order.<\/p>\n

How the U-Bolt Geometry Is Specified<\/h2>\n

ASME B18.31.5 provides general and dimensional requirements for several inch-series bent-bolt forms and also provides a method for identifying non-tabulated configurations by dimensions, material, and finish. It does not define the phenolic bar, sleeve, support reaction, or installation clearance. Metric projects may use a drawing and the purchaser’s designated fastener standards. The order must state whether dimensions apply before or after coating and how thread fit is to be verified.<\/p>\n

Nominal pipe size is not the same as actual pipe outside diameter. The finished inside width must account for the real pipe OD, pipe coating, U-bolt sleeve thickness, installation clearance, and whether the assembly is intended to grip, locate, or guide. The bar hole centres must match the finished U-bolt leg centres, and edge distances must be adequate for the laminate grade and load path. Do not scale dimensions from the representative image.<\/p>\n

Grip, Hold-Down, or Guide Function<\/h2>\n

The same visible parts can be arranged for different support functions. A grip or hold-down detail develops contact according to the engineered tightening method. A guide detail deliberately retains clearance so that axial pipe movement can occur while lateral movement is limited. Nut location alone does not prove the function.<\/p>\n

For a guide, state the cold and operating clearances, movement direction, wear surfaces, adjacent anchors or restraints, and allowable friction. For a hold-down arrangement, state the vertical and lateral reactions, uplift case, pipe-wall sensitivity, allowable contact pressure, and tightening procedure. No universal torque or safe working load is appropriate without the complete geometry, material data, thread engagement, support stiffness, pipe condition, vibration\/fatigue case, and installation method.<\/p>\n

Material, Coating, and Hardware Coordination<\/h2>\n

U-bolt material and coating are separate decisions. Carbon steel, stainless steel, and alloy-steel options require a named grade or class, while a coating specification must separately define surface preparation, coating chemistry, thickness, cure, colour, thread allowance, inspection, and repair rules. The blue hardware in the representative image shows a possible coated configuration; appearance cannot verify a specific proprietary coating or performance level.<\/p>\n

Nuts and washers require their own standards, grades, dimensions, and finish compatibility. ISO 4032:2023, for example, specifies characteristics for steel and stainless-steel metric coarse-pitch regular hex nuts from M5 to M39, but it does not select a nut grade for a particular U-bolt assembly. Isolating washers must also be checked for bearing pressure, creep, temperature, and chemical exposure. The broader insulated U-bolt configuration overview<\/a> shows other sleeve and coating families; this page is specifically about the phenolic laminate support-bar arrangement.<\/p>\n

Manufacturing and Inspection Points<\/h2>\n
    \n
  • Verify laminate identity, thickness, sheet condition, and any required lot or certificate traceability before machining.<\/li>\n
  • Machine holes, recesses, bearing faces, edge radii, and surface finish to the approved drawing without uncontrolled splitting or breakout.<\/li>\n
  • Check U-bolt bend symmetry, inside width, leg centres, leg length, thread length, coating allowance, and nut fit as one dimensional stack.<\/li>\n
  • Ensure sleeve coverage reaches the start of the threaded section without leaving exposed smooth shank and without covering the threads.<\/li>\n
  • Confirm isolating washers, metallic washers where specified, nut sequence, and locking arrangement against the bill of materials.<\/li>\n
  • Record visual, dimensional, coating, material-documentation, and packing checks required by the inspection plan.<\/li>\n<\/ul>\n

    Information Required for a Reliable Quotation<\/h2>\n
      \n
    • Actual pipe outside diameter and, where useful, the related NPS or DN.<\/li>\n
    • U-bolt rod diameter, bend form, inside width, bend radius, leg length, thread length, thread specification, and tolerances.<\/li>\n
    • Grip, hold-down, location, or non-grip guide function, including movement and clearance requirements.<\/li>\n
    • U-bolt material standard and grade\/class, nuts and washers, coating system, and documentation requirements.<\/li>\n
    • Phenolic laminate designation, thickness, width, length, hole centres, hole diameter, machined profile, edge detail, and surface finish.<\/li>\n
    • Sleeve and isolating-washer materials, thicknesses, coverage, hardness or grade, and compatibility requirements.<\/li>\n
    • Pipe metallurgy and coating, support-steel details, installation orientation, and any drainage or moisture-control provisions.<\/li>\n
    • Operating and installation temperatures, corrosion and chemical environment, ultraviolet exposure, vibration, and expected movement.<\/li>\n
    • Design loads and directions, tightening method, inspection\/testing plan, marking, traceability, quantity, and packing.<\/li>\n<\/ul>\n

      Frequently Asked Questions<\/h2>\n

      Is every brown laminate support bar the same material?<\/h3>\n

      No. Colour and visible fabric texture are not sufficient identification. The order should name the applicable IEC, ASTM, NEMA, or project material designation and require the relevant supplier data or certification.<\/p>\n

      Does the phenolic bar make the complete assembly electrically insulated?<\/h3>\n

      Not automatically. Electrical isolation depends on the laminate grade, moisture and contamination, sleeve and washer continuity, clearances, mounting details, and test basis. State the required electrical function and acceptance test if it is safety-critical.<\/p>\n

      Can the bar dimensions be selected from nominal pipe size alone?<\/h3>\n

      No. Actual pipe outside diameter, U-bolt diameter, sleeve build-up, leg centres, support-member dimensions, edge distances, bearing area, and the intended support function are all required.<\/p>\n

      Can a phenolic support bar replace a POM half-round rod?<\/h3>\n

      Not without engineering review. They have different geometry, material behavior, contact area, machining, moisture response, and installation functions. The approved support drawing should identify the intended component.<\/p>\n

      Does SINO-ALLOY provide a universal load or temperature rating?<\/h3>\n

      No universal assembly rating is stated. The ordered laminate grade, U-bolt material, coating, sleeves, washers, geometry, support steel, loads, environment, and installation determine suitability.<\/p>\n

      Request a Project-Specific Quote<\/h2>\n

      Send SINO-ALLOY the approved pipe-support drawing and bill of materials, actual pipe outside diameter, U-bolt and thread dimensions, phenolic laminate designation and bar geometry, sleeve and washer details, material grades, coating specification, grip or guide function, loads, movement, operating temperature, corrosion environment, quantity, and inspection documentation. SINO-ALLOY will review production to the applicable drawing or standard and confirm the custom dimensions, materials, surface protection, insulation components, inspection scope, and packing basis for your project.<\/p>\n","protected":false},"excerpt":{"rendered":"

      Phenolic laminate support-bar U-bolt assemblies manufactured by SINO-ALLOY to approved drawings, with custom U-bolt geometry, laminate grade, sleeve system, coating, hardware, and grip or guide function.<\/p>\n","protected":false},"featured_media":2481,"template":"","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}}},"product_cat":[85],"product_tag":[82],"_links":{"self":[{"href":"https:\/\/www.sino-alloy.com\/clamp\/wp-json\/wp\/v2\/product\/2482"}],"collection":[{"href":"https:\/\/www.sino-alloy.com\/clamp\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.sino-alloy.com\/clamp\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.sino-alloy.com\/clamp\/wp-json\/wp\/v2\/media\/2481"}],"wp:attachment":[{"href":"https:\/\/www.sino-alloy.com\/clamp\/wp-json\/wp\/v2\/media?parent=2482"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.sino-alloy.com\/clamp\/wp-json\/wp\/v2\/product_cat?post=2482"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.sino-alloy.com\/clamp\/wp-json\/wp\/v2\/product_tag?post=2482"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}