{"id":2511,"date":"2026-09-29T03:54:45","date_gmt":"2026-09-29T03:54:45","guid":{"rendered":"https:\/\/www.sino-alloy.com\/clamp\/product\/two-bolt-pipe-clamp\/"},"modified":"2026-09-30T05:05:05","modified_gmt":"2026-09-30T05:05:05","slug":"two-bolt-pipe-clamp","status":"publish","type":"product","link":"https:\/\/www.sino-alloy.com\/clamp\/product\/two-bolt-pipe-clamp\/","title":{"rendered":"MSS Type 4 Two-Bolt Pipe Clamp for Bare Piping"},"content":{"rendered":"

A two-bolt pipe clamp<\/strong> is a split formed-steel attachment used to suspend a horizontal bare pipe, or a pipe with only the clearance permitted by the approved support design. Two curved clamp halves encircle the pipe and are joined by one upper and one lower transverse bolt. The upper connection can receive a weldless eye nut, eye rod, or another engineered hanger interface so the pipe load enters the vertical suspension system. YOUNGLEE supplies drawing-controlled carbon-steel and stainless-steel two-bolt clamps for process plants, utilities, mechanical services, fire-protection systems, and industrial pipe racks. Pipe OD, clamp type, load, temperature, material, fasteners, finish, hanger connection, and inspection requirements are customized to the approved drawing; no universal load or temperature rating is implied.<\/p>\n

MSS Type 4 Two-Bolt Pipe Clamp at a Glance<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
Selection item<\/th>\nYOUNGLEE supply basis<\/th>\nInformation for Buyer Confirmation<\/th>\n<\/tr>\n<\/thead>\n
Product type<\/td>\nTwo formed clamp halves with one upper and one lower joining bolt<\/td>\nRequired support type, figure, standard edition, duty class, and approved drawing<\/td>\n<\/tr>\n
Primary function<\/td>\nHorizontal pipe suspension with a direct metallic clamp around the pipe<\/td>\nOperating, test, occasional, installation, and movement load cases<\/td>\n<\/tr>\n
Typical standard reference<\/td>\nDrawing-controlled arrangement that may follow ANSI\/MSS SP-58 Type 4 when specified<\/td>\nExact standard, edition, dimensional series, material rules, and acceptance criteria<\/td>\n<\/tr>\n
Pipe definition<\/td>\nCustom fit to the stated actual outside diameter<\/td>\nNPS or DN, schedule, actual OD, tolerance, coating, lining, and any non-standard OD<\/td>\n<\/tr>\n
Material options<\/td>\nCarbon steel or project-specified stainless steel, subject to technical review<\/td>\nMaterial specification, grade, product form, condition, temperature, corrosion environment, and traceability<\/td>\n<\/tr>\n
Fasteners<\/td>\nCompatible bolts or studs, nuts, and washers for the two clamp joints<\/td>\nFastener grade, thread system, dimensions, locking method, finish, temperature basis, and certificates<\/td>\n<\/tr>\n
Finish options<\/td>\nPlain, painted, zinc-plated, hot-dip-galvanized, or another approved project finish<\/td>\nCoating standard, thickness or class, thread allowance, service exposure, temperature limit, and repair method<\/td>\n<\/tr>\n
Customization<\/td>\nInside radius, strip width and thickness, ear geometry, upper gap, bolt locations, and hanger interface<\/td>\nComplete dimensioned drawing, quantity, inspection plan, marking, and packaging<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Customization Note:<\/strong> This table lists manufacturing choices and engineering inputs, not a stock dimensional series or a certified capacity table. Final dimensions, section sizes, materials, fasteners, load rating, temperature basis, finish, and hanger connection must be approved for the actual piping system before production.<\/p>\n

How Does a Two-Bolt Pipe Clamp Support a Horizontal Pipe?<\/h2>\n

The two formed halves create a closed ring around the pipe. The upper and lower bolts hold the halves together, maintain the intended clamp geometry, and transfer force between the two sections. At the top of the assembly, the approved eye component or rod connection carries the vertical reaction into the hanger rod, structure, spring unit, or another designed support component.<\/p>\n

The load path must be defined on the support drawing. A clamp that grips a bare pipe tightly behaves differently from a guide, sliding support, insulated saddle, or lined clamp. The selected gap, bolt preload, strip width, formed radius, pipe contact, and upper connection all influence fit and local pipe loading. YOUNGLEE manufactures the specified configuration; it does not infer restraint function from a catalog photograph.<\/p>\n

Why are there exactly two clamp bolts?<\/h3>\n

In this arrangement, one bolt closes the upper ears and one closes the lower ears. They join the two clamp halves at opposed locations around the pipe. The top joint also provides the geometry required for the selected hanger connection. A two-bolt pipe clamp should not be confused with a U-bolt, which has one bent round bar and two threaded legs, or with a three-bolt clamp that uses an additional load bolt outside a thicker insulation envelope.<\/p>\n

What does MSS SP-58 Type 4 mean?<\/h3>\n

ANSI\/MSS SP-58 provides an industry basis for pipe hangers and supports covering materials, design, manufacture, selection, application, inspection, and installation. Manufacturer catalogs commonly identify Type 4 as a steel pipe clamp for suspending cold or hot piping where little or no insulation is required. A Type designation does not by itself establish dimensions, allowable load, temperature rating, material, coating, or certification. The purchase order must identify the edition, figure or drawing, and all project-specific requirements.<\/p>\n

Type 4, Type 3, Riser Clamp, and Clevis Hanger Comparison<\/h2>\n
\n\n\n\n\n\n\n\n\n\n
Attachment<\/th>\nTypical load path<\/th>\nBest-fit procurement intent<\/th>\nImportant limitation<\/th>\n<\/tr>\n<\/thead>\n
Type 4 two-bolt pipe clamp<\/td>\nTwo split curved halves contact the pipe; upper hanger interface carries the vertical reaction<\/td>\nBare or lightly insulated horizontal piping with a drawing-defined clamp and rod connection<\/td>\nDirect pipe contact, local stress, tightening, and any insulation clearance require engineering review<\/td>\n<\/tr>\n
Type 3 three-bolt pipe clamp<\/td>\nTwo bolts close the clamp while a separate load bolt connects outside the insulation<\/td>\nHorizontal insulated piping where the suspension point must clear a larger insulation envelope<\/td>\nThe third load bolt, ear extension, spacer, and insulation geometry are not present on a Type 4 clamp<\/td>\n<\/tr>\n
Two-bolt riser clamp<\/td>\nExtended ears bear on floor steel or another support, often with a pipe coupling or shear-lug load input<\/td>\nVertical pipe support at a floor, platform, or structural opening<\/td>\nIts vertical-pipe load path is not interchangeable with a suspended horizontal clamp<\/td>\n<\/tr>\n
Adjustable clevis hanger<\/td>\nThe pipe rests in a lower yoke carried by a cross bolt and upper threaded connection<\/td>\nHorizontal suspension where vertical adjustment and a non-gripping cradle are preferred<\/td>\nIt does not provide the same wrap, contact, or clamp behavior as a two-bolt pipe clamp<\/td>\n<\/tr>\n
DIN 3567 pipe clamp<\/td>\nTwo standard-based half-shells and side bolts form a pipe bracket<\/td>\nProjects that explicitly require the DIN dimensional basis or an approved derivative drawing<\/td>\nDIN geometry and MSS Type 4 terminology must not be treated as automatically equivalent<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Customization Note:<\/strong> These descriptions explain common selection differences only. The responsible piping and structural engineers must define the actual load path, restraint, movement, insulation, pipe local-stress limits, support spacing, and structural connection. Appearance alone is not a design classification.<\/p>\n

Selecting the Clamp Body Material<\/h2>\n

Carbon steel is commonly specified for fabricated pipe clamps when the service temperature, corrosion exposure, and project material rules permit it. Stainless steel may be selected for a corrosive atmosphere or a defined plant material system, but grade selection must consider temperature strength, chloride exposure, galling, fastener compatibility, fabrication condition, and galvanic contact with the pipe or structure. A generic reference to \u201cstainless\u201d is not enough for manufacture.<\/p>\n

The clamp body and its fasteners are separate specification items. A carbon-steel body does not automatically define the bolt and nut grades, and a stainless body does not make every fastener grade suitable. The purchase specification should state the material standard and grade for the formed halves, upper and lower bolts, nuts, washers, and the eye or rod attachment. Heat treatment, hardness, traceability, and material certificates must be called out when required.<\/p>\n

Temperature is a design input, not a catalog shortcut<\/h3>\n

Published manufacturer figures list different allowable loads and temperature limits because their strip sections, materials, bolts, geometry, and design bases differ. Those values are useful evidence that the product category exists, but they are not YOUNGLEE ratings. The project engineer must provide the design metal temperature, load combinations, allowable-stress basis, support spacing, and required safety or code factors before a capacity can be approved.<\/p>\n

Finish and Corrosion-Protection Options<\/h2>\n

Plain or painted carbon steel may suit a controlled indoor environment. Electroplated zinc can provide a comparatively thin metallic finish where thread fit and moderate atmospheric protection are important. Batch hot-dip galvanizing may be specified for fabricated carbon-steel clamp halves under ISO 1461 or another applicable project standard; fasteners may require a separate coating standard and thread allowance. The finish must be selected for the actual environment and temperature rather than from color or appearance.<\/p>\n

Coating review should address fabrication sequence, venting and drainage where relevant, minimum and maximum coating thickness, threaded fit, contact surfaces, hydrogen-embrittlement controls for susceptible high-strength fasteners, wet-storage stain prevention, field repair, and compatibility with the pipe coating. Galvanized, plated, painted, and stainless assemblies are not automatically interchangeable.<\/p>\n

Pipe Size, Actual OD, and Clamp Geometry<\/h2>\n

NPS or DN identifies the nominal piping system, but the formed clamp must fit the actual pipe outside diameter. Schedule changes normally alter wall thickness rather than the OD within a standard steel-pipe series, yet non-standard tube, cast pipe, lined pipe, coated pipe, jacketed pipe, or special project components can have a different outside dimension. The RFQ should therefore state both nominal size and the controlling actual OD, including tolerance and any coating or overlay that remains under the clamp.<\/p>\n

The approved drawing should define the inside radius, strip width and thickness, overall height, upper and lower gaps, ear lengths, bolt-hole diameters, hole spacing, edge distances, rod take-out, and connection clearances. If dimensions are supplied in inches, YOUNGLEE preserves every decimal place provided and multiplies the unrounded inch value by 25.4 for millimetre conversion. Premature rounding can create avoidable fit, hole-location, and assembly errors.<\/p>\n

Grip, support, or installation clearance?<\/h3>\n

A clamp that is intended to grip the pipe needs a controlled installed diameter or tightening requirement. A support that merely encircles the pipe may require clearance, a liner, a shield, or a different attachment type. The buyer must state whether the component is a load-carrying hanger attachment, a restraint, a guide, or part of a seismic bracing system. These functions involve different reactions and must not be assigned by tightening the bolts until the visible gap disappears.<\/p>\n

Engineering and RFQ Data Required<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n
Project input<\/th>\nWhy it matters<\/th>\nEffect on the manufactured clamp<\/th>\n<\/tr>\n<\/thead>\n
Pipe definition<\/td>\nNominal size alone may not establish the contact diameter<\/td>\nInside radius, developed length, tolerances, and inspection gauges<\/td>\n<\/tr>\n
Load cases<\/td>\nOperating, test, occasional, installation, and seismic reactions can govern different parts<\/td>\nStrip section, bolt sizes, eye connection, allowable stress, and documentation<\/td>\n<\/tr>\n
Temperature<\/td>\nMaterial strength and coating suitability vary with metal temperature<\/td>\nBody material, fasteners, finish, heat treatment, and design verification<\/td>\n<\/tr>\n
Insulation and pipe coating<\/td>\nDirect contact, clearance, compression, and damage risk change the support arrangement<\/td>\nClamp bore, liner or shield requirement, ear gap, and hanger position<\/td>\n<\/tr>\n
Movement and restraint<\/td>\nThermal displacement can rotate, misalign, or overload a rigid hanger<\/td>\nRod articulation, clearance, installed orientation, and adjacent support coordination<\/td>\n<\/tr>\n
Environment<\/td>\nIndoor, outdoor, marine, chemical, wet-insulation, and fire-protection services present different corrosion risks<\/td>\nMaterial grade, coating system, isolation, drainage, packaging, and inspection<\/td>\n<\/tr>\n
Quality plan<\/td>\nTraceability and acceptance checks must be planned before forming and coating<\/td>\nMaterial certificates, dimensional reports, PMI, coating records, NDE, witness points, and marking<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Customization Note:<\/strong> This table is a quotation and design-review checklist, not a calculation, load table, or certification. Final capacity, temperature suitability, pipe local-stress acceptance, hanger spacing, seismic duty, and structural attachment remain project-specific and require approval by the responsible engineer.<\/p>\n

Manufacturing and Inspection Controls<\/h2>\n

YOUNGLEE can form the two curved clamp halves, produce the upper and lower ears, drill or punch the bolt holes, and supply compatible hardware to the approved drawing. Manufacturing controls may include material identification, strip width and thickness, forming radius, ear parallelism, gap dimensions, hole location, edge quality, flatness, surface preparation, coating allowance, thread fit, and trial assembly around a gauge or confirmed pipe OD.<\/p>\n

Inspection can include material certificates when ordered, dimensional reports, visual examination, thread gauging, coating documentation, positive material identification, hardness checks, or other project-defined controls. Welding, proof loading, seismic approval, UL or FM listing, high-temperature qualification, nondestructive examination, third-party inspection, and certification are not implied. If required, they must be stated before quotation so the production and inspection route can be reviewed.<\/p>\n

Installation Considerations<\/h2>\n