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Rivets · Trade series (Huck Magna-Grip)

A4 (316) Stainless Steel Huck Magna-Grip Lockbolt Assembly

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

A4 Stainless Steel Huck Magna-Grip Lockbolt Assembly 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 Huck Magna-Grip Lockbolt Assembly reference image

Huck Magna-Grip Lockbolt Assembly manufactured in A4 Stainless Steel (ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80) are dimensioned to Trade series (Huck Magna-Grip). The sections below give the mechanical and physical properties of the grade, its behavior in corrosive and elevated-temperature service, and the full size table.

Why Choose A4 Stainless Steel for Huck Magna-Grip Lockbolt Assembly

Specified for marine, coastal and chemical applications. For huck magna-grip lockbolt assembly, 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 Huck Magna-Grip Lockbolt Assembly in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.

Comparable Grades

For Huck Magna-Grip Lockbolt Assembly, the alternative stainless grade is A2 (304). A2 (304) suits general indoor and outdoor service; A4 (316) adds molybdenum for marine and chloride environments. Where higher strength matters more than corrosion, switch to plated alloy-steel class 8.8 or 10.9.

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 Huck Magna-Grip Lockbolt Assembly Available in A4 Stainless Steel

Nominal diameter (in)Grip ranges (in)Pin materialCollar materialCollar stylesHead style
3/160.062~0.625 / 0.312~1.250carbon steel or 7075-T6 aluminumcarbon steel or 6061 aluminumstandard / medium-flange / wide-flangebutton head
1/40.062~0.625 / 0.312~1.250carbon steel or 7075-T6 aluminumcarbon steel or 6061 aluminumstandard / medium-flange / wide-flangebutton head
5/160.125~0.750 / 0.625~1.375carbon steel or 7075-T6 aluminumcarbon steel or 6061 aluminumstandard / medium-flange / wide-flangebutton head
3/80.125~0.875 / 0.812~1.625carbon steel or 7075-T6 aluminumcarbon steel or 6061 aluminumstandard / medium-flange / wide-flangebutton head

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 (Huck Magna-Grip))

Nominal diameter (in)Grip ranges (in)Pin materialCollar materialCollar stylesHead style
3/160.062~0.625 / 0.312~1.250carbon steel or 7075-T6 aluminumcarbon steel or 6061 aluminumstandard / medium-flange / wide-flangebutton head
1/40.062~0.625 / 0.312~1.250carbon steel or 7075-T6 aluminumcarbon steel or 6061 aluminumstandard / medium-flange / wide-flangebutton head
5/160.125~0.750 / 0.625~1.375carbon steel or 7075-T6 aluminumcarbon steel or 6061 aluminumstandard / medium-flange / wide-flangebutton head
3/80.125~0.875 / 0.812~1.625carbon steel or 7075-T6 aluminumcarbon steel or 6061 aluminumstandard / medium-flange / wide-flangebutton head

Applications & Industries

The sectors that buy Huck Magna-Grip Lockbolt Assembly, and the duty each one buys them for. Stocked from 3/16 to 3/8 (screw size).

Industries that specify Huck Magna-Grip Lockbolt Assembly

  • Agricultural equipment Permanent joints in frames and implements exposed to field vibration.
  • Rail and transit One-side fastening of structural skins and support members.
  • Off-highway equipment Button-head joints where the collar must stay locked under shock.
  • Truck and trailer assembly Grip-range lockbolts in chassis and body structures.
  • Transport & bodywork Trailer, bus and van panels joined blind from one side.
  • Signage & cladding Fast, vibration-resistant fixing of thin material.

Typical applications

  • installing a button-head lockbolt with a swaged collar
  • combining carbon-steel or aluminum-alloy pin and collar options
  • forming a permanent joint from the accessible face only
  • choosing a grip range for the actual stack of joined material
  • 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.
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 span an unverified grip range; an under-gripped or over-gripped lockbolt does not form the intended collar.
  • Not for a joint that has to come apart in service — removal means drilling the rivet out.

Full application guide: where Huck Magna-Grip Lockbolt Assembly 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 corrosion resistance do A4 Stainless Steel Huck Magna-Grip Lockbolt Assembly offer?

A4 Stainless Steel Huck Magna-Grip Lockbolt Assembly 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.

Should I choose A4 Stainless Steel or A2 (304) for Huck Magna-Grip Lockbolt Assembly?

For Huck Magna-Grip Lockbolt Assembly, A4 Stainless Steel suits general indoor and outdoor use; A2 (304) is preferred for marine, coastal and chemical environments. Choose by corrosion exposure first.

Can A4 Stainless Steel Huck Magna-Grip Lockbolt Assembly gall during installation?

Yes — stainless on stainless is prone to thread galling under load, especially at smaller sizes. Use an anti-galling lubricant or wax thread compound, and slow the tightening rate where possible.

Is A4 Stainless Steel food-grade?

A4 (316) is the standard food-contact stainless grade in most jurisdictions, particularly where chloride exposure (brines, dairy CIP) is present.

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.