RB-Q domed square metal washer

HomeProductsDirect fasteningWashers
Request information
RB Q 1920x1920px

Square domed metal washer in zinc-plated steel with central countersink.

Product description

Square domed metal washer in zinc-plated steel, 70×70 mm, with central countersink.

Access the technical area

  • Calculation program
  • Bossong CAL
  • Catalogs and technical data sheets
  • Tutorial

Other products in this category

Show all
ROND X2 1920x1920px

Double washer (X2)

Stainless steel A2 flat washer, used with threaded rods and nuts, for uniform load distribution.

Text link
ROND X3 1920x1920px

Triple washer (X3)

Triple zinc-plated steel washer, used with threaded rods and nuts, for uniform load distribution.

Text link
ROND 1920x1920px

Washer

Zinc-plated steel flat washer, used with threaded rods and nuts, for uniform load distribution.

Text link
R KDC 1920x1920px

R-KDC plastic spacer Ø47

Plastic spacer diameter 47 mm.

Text link
R KISL 1920x1920px

R-KISL plastic insulation washer

Plastic insulation washer with outer diameter 30 mm or 60 mm.

Text link
RB O 1920x1920px

RB-O domed oval metal washer

Oval domed metal washer in zinc-plated steel with central countersink.

Text link
RB 1920x1920px

RB domed round metal washer

Round domed metal washer in zinc-plated steel with central countersink.

Text link
RC 8F 1920x1920px

RC-8F 8-hole metal washer

Metal washer with 8 holes in zinc-plated steel.

Text link
RB BUL 1920x1920px

RB-BUL Bulgarian-type washer

Deformable stainless steel A2 washer, Bulgarian type, for anti-spalling applications.

Text link
R 1920x1920px

R flat washer (metal)

Flat metal washer in steel for mechanical fixings and assemblies.

Text link
Show all

Request information

Fill out the form, and we will respond as soon as possible.

    01 Chimico 21x21

    Chemical anchors

    Bossong offers a complete range of chemical anchors engineered to provide outstanding reliability, fast installation, and compliance with European regulations.
    The choice depends on the type of base material, installation conditions, and required load performance.
    Chemical anchors are the ideal solution when a secure and long-lasting fastening is needed across different construction materials. They work through a resin that, once injected into the hole with a threaded rod or rebar, hardens and creates a high-strength bond. Versatile and high-performing, chemical anchors are suitable for applications ranging from small craft installations to demanding structural works.

    Text link
    02 BarreElementiAncoraggio 21x21

    Threaded rods & anchoring elements

    Bossong offers a wide range of rods and accessories designed to suit various construction materials and on-site requirements, always in compliance with current technical standards.
    Threaded rods and anchoring elements are essential components in construction fixings. Used together with chemical or mechanical anchors, they ensure strength, safety, and precision.
    Whether for structural connections, masonry installations, or light fixings, these elements form the core of the anchoring system, providing the crucial link between the structure and the base material.

    Text link
    03 ChimicaPerEdilizia 21x21

    Construction chemicals

    Construction chemicals include essential products for fastening, filling, and protection tasks. From pourable epoxy resin for structural consolidation to polyurethane foams for quick sealing, and professional sprays for maintenance and treatment, these materials make site operations faster, more accurate, and more durable.
    Bossong provides safe, tested solutions engineered to deliver consistent performance at every stage of the construction process.

    Text link
    04 AncorantiMeccanici 21x21

    Mechanical anchors

    Mechanical anchors are fastening systems that rely on expansion or mechanical tightening to secure an element within the base material. They offer a fast, reliable solution suitable for both light loads and more demanding applications.
    Bossong provides a complete assortment of anchors and accessories designed for different materials and installation conditions.

    Text link
    05 FissaggiLeggeri 21x21

    Lightweight Anchors

    Light-loads anchors are designed for quick, secure fixings in low-strength materials or thin supports such as plasterboard, hollow blocks, or insulation panels.
    They stand out for ease of installation, versatility, and practicality—making them indispensable for everyday applications.
    Bossong offers a selection of high-quality products capable of meeting the needs of construction professionals.

    Text link
    06 FissaggioConViti 21x21

    Fastening with screws

    Screw fastening is the most common and immediate fixing solution in construction, thanks to its ease of use and the high level of safety it provides.
    Each screw type is engineered to match specific base materials—from wood to concrete, steel, and window or door frames.
    Bossong supports industry professionals in their daily work with a wide range of products developed through decades of field experience.

    Text link
    07 FissaggioSparo 21x21

    Direct fastening

    Powder-actuated direct fastening makes it possible to drive nails and brackets directly into the base material without pre-drilling, significantly reducing installation time and costs.
    This technology is especially valuable on construction sites where speed is essential.
    Bossong enables construction professionals to work with speed, precision, and safety thanks to internally developed systems backed by decades of industry experience.

    Text link
    08 ChiodiMano 21x21

    Hand nailing

    Manual nail fastening remains one of the most practical and immediate solutions for light-duty applications or finishing work.
    Simple and reliable tools make it ideal for light carpentry and everyday on-site tasks.
    Bossong has always offered a wide range of nails and accessories to ensure safe and comfortable work conditions.

    Text link
    09 PerforazioneTaglio 21x21

    Drilling & cutting

    Drilling and cutting are everyday tasks on construction sites.
    To ensure precision, speed, and long tool life, Bossong offers a complete range of dedicated equipment—products developed through extensive field experience and continuous dialogue with construction professionals, delivering maximum performance in every condition.

    Text link
    10 AttrezzatureProva 21x21

    Testing equipment

    Testing equipment is essential for verifying the holding power and strength of installed anchors, ensuring safety and regulatory compliance.
    Bossong designs each solution according to strict standards, drawing on decades of field experience and continuous internal research to offer construction professionals the highest performance in every context.

    Text link
    Work in progress

    Structural consolidation

    Text link