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Rivets · Trade series (Avdel Monobolt)

A4 (316) Stainless Steel Structural Breakstem Blind Rivets

Mechanical properties, corrosion behaviour and the full dimensional range for this grade.

A4 Stainless Steel Structural Breakstem Blind Rivets are supplied to ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80. Corrosion behaviour is superior, including marine and chloride environments, the material is largely non-magnetic, and the usable service range is approx. -200 °C to +400 °C, subject to the property class and the joint. In practice this grade is specified for marine, coastal and chemical applications.

Grade
ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80
Corrosion resistance
Superior, including marine and chloride environments
Magnetic response
Largely non-magnetic
Service temperature
approx. -200 °C to +400 °C, subject to the property class and the joint

Property values are typical for the grade. Certified mechanical test data is available on request for production orders.

A4 (316) Stainless Steel Structural Breakstem Blind Rivets reference image

For structural breakstem blind rivets in A4 Stainless Steel, the controlling selection factors are corrosion exposure, strength requirement and service temperature. The grade data for A4 Stainless Steel (ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80) is summarized below together with every size supplied.

Why Choose A4 Stainless Steel for Structural Breakstem Blind Rivets

Specified for marine, coastal and chemical applications. For structural breakstem blind rivets, this matters when superior, including marine and chloride environments is the primary requirement.

Mechanical & Physical Properties

Grade designationISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80
Magnetic responseLargely non-magnetic
Service temperatureapprox. -200 °C to +400 °C, subject to the property class and the joint
Corrosion characteristicSuperior, including marine and chloride environments

Corrosion Behavior in Service

A4 (316) adds 2–3% molybdenum to the A2 (304) composition, which dramatically improves resistance to chloride-pitting corrosion. For Structural Breakstem Blind Rivets in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.

Galvanic & Galling Considerations

For stainless structural breakstem blind rivets the compatibility question is galvanic rather than galling: joined to aluminum or galvanized steel in wet service, stainless drives corrosion of the less-noble metal. Isolate with a coating, sleeve or non-conductive washer where the joint sees moisture. Note also that stainless is softer than hardened carbon steel, so where the part carries a wear or shear duty, check the load against the grade before substituting.

Using Stainless Fasteners in Aluminum

Stainless steel is more noble than aluminum, so in the presence of an electrolyte — rain, condensation, salt spray — the aluminum becomes the anode and corrodes at the joint. The effect is driven by the area ratio: a small stainless fastener in a large aluminum section is normally acceptable, while a large stainless fastener in thin aluminum is not. Where the joint is wet, isolate the two metals with a coated or nylon washer and a sealant, or specify an aluminum or coated fastener instead.

Sizes of Structural Breakstem Blind Rivets Available in A4 Stainless Steel

Nominal diameter (mm)Equivalent inch diameterGrip typeStem lockMaterial optionsJoint option
4.83/16multi-grip structuralmechanically lockedaluminum alloy / steel / 304Cu-A2 / 316-A4 stainlesssealed-joint capable
6.41/4multi-grip structuralmechanically lockedaluminum alloy / steel / 304Cu-A2 / 316-A4 stainlesssealed-joint capable
103/8multi-grip structuralmechanically lockedaluminum alloy / steel / 304Cu-A2 / 316-A4 stainlesssealed-joint capable

Technical Drawing

Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.

Sends the selected values to the quote form below.

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Specification
Business Information

Dimensions & Specifications (Trade series (Avdel Monobolt))

Nominal diameter (mm)Equivalent inch diameterGrip typeStem lockMaterial optionsJoint option
4.83/16multi-grip structuralmechanically lockedaluminum alloy / steel / 304Cu-A2 / 316-A4 stainlesssealed-joint capable
6.41/4multi-grip structuralmechanically lockedaluminum alloy / steel / 304Cu-A2 / 316-A4 stainlesssealed-joint capable
103/8multi-grip structuralmechanically lockedaluminum alloy / steel / 304Cu-A2 / 316-A4 stainlesssealed-joint capable

Applications & Industries

The sectors that buy Structural Breakstem Blind Rivets, and the duty each one buys them for. Stocked from 4.8 to 10 (nominal diameter).

Industries that specify Structural Breakstem Blind Rivets

  • Cladding systems One-side sheet fastening with a mechanically retained breakstem.
  • HVAC enclosures High-volume structural riveting where the rear face cannot be reached.
  • Rail equipment Vibration-exposed panel joints using a filled structural rivet body.
  • Commercial vehicles Structural blind joints in frames, panels and box sections.
  • Transport & bodywork Trailer, bus and van panels joined blind from one side.
  • Signage & cladding Fast, vibration-resistant fixing of thin material.

Typical applications

  • retaining the breakstem to keep the installed body filled
  • joining sheet, profiles and closed sections without rear access
  • selecting a sealed-joint configuration only when the listed option qualifies
  • forming a multi-grip structural blind joint from one side
  • blind fixing where only one side can be reached
  • riveted pivots that must stay tight but still turn

Service conditions to specify against

Marine and coastal
Available in A4 (316) stainless for chloride exposure — coastal structures, pool halls, water treatment and deck hardware, where A2 will eventually pit.
Sealed joints
Used where the fixing has to keep water or air out as well as hold — the elastomer, not the fastener, decides service life.
Vibration
Specified where cyclic load would loosen a plain nut or screw — rotating plant, rail, mobile equipment and anything that is not re-torqued in service.

Where to use something else

  • Do not treat every material and grip combination as sealed; confirm the exact rivet configuration.
  • Not for a joint that has to come apart in service — removal means drilling the rivet out.

Full application guide: where Structural Breakstem Blind Rivets are used, how to specify them, and the cases they are wrong for

Inside the plant

Manufactured in our own plant

This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.

  1. Wire rod feeding into a cold heading machine
    01

    Cold heading

    Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail.

    Head dimensions and under-head radius checked at set-up and per shift.

  2. Thread rolling machine producing bolt threads
    02

    Thread rolling

    Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch.

    Go / no-go ring gauges to ISO 965 tolerance class 6g.

  3. Baskets of bolts staged for heat treatment
    03

    Heat treatment

    Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it.

    Core hardness and tensile tested per lot to ISO 898-1.

  4. Zinc plated bolts in a treatment basket
    04

    Surface treatment

    Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list.

    Coating thickness and neutral salt spray hours to ISO 9227.

Frequently Asked Questions

What's the service temperature limit for A4 Stainless Steel?

The practical service range is approx. -200 °C to +400 °C, subject to the property class and the joint.

Can A4 Stainless Steel replace plated alloy steel structurally?

Only at the standard strength classes — A2-70 / A4-80 are roughly equivalent to class 7 steel; A4-100 reaches class 8.8. For class 10.9 or 12.9 strength, plated alloy steel is required.

Are A4 Stainless Steel Structural Breakstem Blind Rivets magnetic?

A4 Stainless Steel Structural Breakstem Blind Rivets are largely non-magnetic.

What corrosion resistance do A4 Stainless Steel Structural Breakstem Blind Rivets offer?

A4 Stainless Steel Structural Breakstem Blind Rivets provide superior, including marine and chloride environments with a service range of approx. -200 °C to +400 °C, subject to the property class and the joint.

How do I request a quotation?

Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day.