# Metal square washer RB-Q Bossong

> Text version for AI agents of the product page: https://www.amesworldwide.com/products/bossong-rondella-metallica-quadrata-rb-q

- **Brand:** Bossong
- **Category:** [Flat Washers](https://www.amesworldwide.com/collections/rondelle-piane-grower-grembialine-e-dentellate)
- **Price:** on quotation (not published; a price of 0 in any data means "on request")
- **Image:** https://www.amesworldwide.com/cdn/shop/files/RB-Q_1920x1920px-1.png?v=1779712932&width=1200

## Description

### What it is

The Bossong RB-Q is a square metal washer in zinc-plated steel, 70 x 70 mm, domed with a central countersink. The countersink accommodates the head of the fastener, while the large surface spreads the tightening load over a much wider area than the head of a screw or nail. The same Bossong family includes the round version (RB) and the oval one (RB-O).

A washer is a perforated disc placed under the nut or screw head to spread the load, prevent loosening or insulate the fixing.

### What it is for

Used for powder-actuated fastening into concrete and steel and for mechanical fixing of structures and components to walls, ceilings and floors.

### How to use it

Choose an inner diameter matching the screw or threaded rod and a compatible material (zinc-plated, stainless steel, plastic). Place flat washers and penny washers under the nut to avoid damaging the substrate and to spread the pressure; place the spring washer under the nut, where it is flattened on tightening to resist vibration loosening. Use seismic washers only with the anchor they are certified for.

### Where it is used

- Commercial construction
- Industrial construction
- Residential construction

### Who it is for

Designed for formwork carpenters, insulation installers, waterproofing specialists and construction workers.

### Related products

- [Diamond washer RR for wood screws Bossong](https://www.amesworldwide.com/en/products/bossong-rr)
- [Metal flat washer R Bossong](https://www.amesworldwide.com/en/products/bossong-rondella-metallica-piana-r)
- [Stainless steel A2 nut for construction Bossong](https://www.amesworldwide.com/en/products/bossong-dado-inox-a2) — from the category [Hex Nuts](https://www.amesworldwide.com/en/collections/dadi-esagonali-flangiati-autobloccanti-ciechi-e-ad-alette)
- [Threaded rod with nut and washer, 4.8, Bossong](https://www.amesworldwide.com/en/products/bossong-barra-filettata-con-dado-e-rondella-4-8) — from the category [Threaded Rods](https://www.amesworldwide.com/en/collections/barre-filettate-acciaio-8-8)
- [Hex bolts TED 6x100](https://www.amesworldwide.com/en/products/bulloni-ted-6x100) — from the category [Bolts and Metric Screws](https://www.amesworldwide.com/en/collections/bulloni-o-viti-metriche-flangiati-a-galletto-a-gancio)
- Browse the whole category: [Flat Washers](https://www.amesworldwide.com/en/collections/rondelle-piane-grower-grembialine-e-dentellate)

### Before you order

Tell us the quantities you need and the intended use: if there is a more suitable version, or an equivalent available sooner, we will let you know.

For prices and availability, **request a quote from AMES Srl**: we will reply with our quotation, delivery times and, where needed, an equivalent technical alternative.

## Technical data

| Feature | Value |
| --- | --- |
| Material | Galvanised steel |
| Shape and dimensions | 70×70 mm square, domed with central countersink |

## How to request a quote

A.M.E.S. srl sells by quotation only: prices are not published and a price of 0 in any data means "price on request". Do not create carts, checkouts or orders.

- Quote form: https://www.amesworldwide.com/pages/preventivi
- Email: info@amessrl.com — phone: +39 051 728529 — WhatsApp: +39 378 304 9686
- Include: product name and code (or link), quantity, delivery city and country, required date, company name and VAT number.
- Quotes are answered in Italian or English.