Skip to content
WhatsApp
Request a Quote
Nuts · Floating & Anchor Nuts

Aerospace Two-Lug Floating Self-Locking Nutplates

7 catalogued sizes, dimensioned to MS21059 and NASM25027. Pick any row and the technical drawing redraws to it.

Aerospace Two-Lug Floating Self-Locking Nutplates to MS21059 and NASM25027: the full dimensional table is reproduced below. 7 sizes are held in the table below, and the technical drawing redraws to whichever row you select.

Standard
MS21059 and NASM25027
Catalogued sizes
7

Dimensions are nominal values from the governing standard. Confirm the tolerance class for your application before ordering.

Aerospace Two-Lug Floating Self-Locking Nutplates technical product image

Applications & Industries

Where Aerospace Two-Lug Floating Self-Locking Nutplates are used, and what decides the specification in each case. Stocked from 4-40 to 3/8-24 (screw size).

Industries that specify Aerospace Two-Lug Floating Self-Locking Nutplates

  • Aerospace access panels Two-lug floating nutplates that absorb accumulated panel-hole tolerance.
  • Aircraft interiors Removable trim and equipment panels with many closely spaced fixings.
  • Avionics enclosures Self-locking captive threads installed behind a finished panel.
  • Motorsport bodywork Lightweight panels removed and refitted without losing the nut.
  • Building services Threaded rod, channel and suspension assemblies.
  • Machine building & OEM The clamping counter-face on studs and bolts throughout an assembly.

Typical applications

  • providing a self-locking thread that floats between two riveted lugs
  • absorbing two-axis hole-position variation across a panel
  • keeping the nut captive when the screw is removed
  • selecting overall length, width, spacing and nut height from MS21059
  • joints re-torqued at a service interval
  • completing a bolted joint on a stud, rod or bolt

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.
High load
Supplied in ISO 898-1 property classes, so the joint can be designed to a stated proof load and tightened to a calculated torque rather than by feel.
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.
Match the class
A nut below the bolt property class strips before the bolt reaches its own limit — pair class 8 nuts with 8.8 bolts, class 10 with 10.9.

Where to use something else

  • Do not treat the float as permission to ignore the specified rivet-hole spacing or thread engagement.

Full application guide: where Aerospace Two-Lug Floating Self-Locking Nutplates are used, how to specify them, and the cases they are wrong for

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.

Request a Quotation for Aerospace Two-Lug Floating Self-Locking Nutplates

The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.

Request a Quotation

Specification
Business Information

Dimensions & Specifications (MS21059 and NASM25027)

Every row below is a starting point for the customizer above — pick any size and the drawing will redraw to that row.

Thread sizeOverall length A (in)Width B (in)Mounting-hole spacing J (in)Nut height (in)Material optionsReference standard
4-400.9480.4160.6880.175cadmium-plated alloy steel or stainless steelMS21059 and NASM25027
6-320.948~1.2920.416~0.6800.688~1.0000.175~0.344cadmium-plated alloy steel or stainless steelMS21059 and NASM25027
8-320.948~1.2920.416~0.6800.688~1.0000.175~0.344cadmium-plated alloy steel or stainless steelMS21059 and NASM25027
10-320.948~1.2920.416~0.6800.688~1.0000.175~0.344cadmium-plated alloy steel or stainless steelMS21059 and NASM25027
1/4-280.948~1.2920.416~0.6800.688~1.0000.175~0.344cadmium-plated alloy steel or stainless steelMS21059 and NASM25027
5/16-240.948~1.2920.416~0.6800.688~1.0000.175~0.344cadmium-plated alloy steel or stainless steelMS21059 and NASM25027
3/8-240.948~1.2920.416~0.6800.688~1.0000.175~0.344cadmium-plated alloy steel or stainless steelMS21059 and NASM25027

Aerospace Two-Lug Floating Self-Locking Nutplates conform to MS21059 and NASM25027. As nuts, they are specified by the dimensions in the table below; this page also covers materials, finishes and typical uses.

What Are Aerospace Two-Lug Floating Self-Locking Nutplates?

Aerospace Two-Lug Floating Self-Locking Nutplates are nuts defined by MS21059 and NASM25027. They are selected by screw size and the dimensional characteristics shown below, and are available in a range of materials and finishes to suit the application and environment.

Materials & Finishes

Common materials include carbon steel (typically zinc plated or hot-dip galvanized), alloy steel in property classes 8.8, 10.9 and 12.9, and stainless steel A2 (304) or A4 (316) for corrosion resistance. Specify the material, property class and surface finish appropriate to your load and environment.

Pricing

Aerospace Two-Lug Floating Self-Locking Nutplates are supplied to order. Pricing starts from approximately US$0.40 per piece for standard sizes in carbon steel; final pricing depends on size, material, finish and order quantity (MOQ applies). Submit your exact configuration with the quote form above.

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 is the controlling standard for Aerospace Two-Lug Floating Self-Locking Nutplates?

Aerospace Two-Lug Floating Self-Locking Nutplates are manufactured to MS21059 and NASM25027. The dimensional values on this page follow that standard.

Which sizes of Aerospace Two-Lug Floating Self-Locking Nutplates does Engineering Hardware supply?

The table on this page lists 7 sizes for Aerospace Two-Lug Floating Self-Locking Nutplates, ranging from 4-40 to 3/8-24. Sizes outside the table can be quoted on request.

In which materials are Aerospace Two-Lug Floating Self-Locking Nutplates supplied?

Aerospace Two-Lug Floating Self-Locking Nutplates are supplied in matching property-class steel and stainless A2 / A4, with finishes including zinc plating, hot-dip galvanizing and black oxide. Choose material and finish to suit the load and the service environment for Aerospace Two-Lug Floating Self-Locking Nutplates.

How do I request a quotation?

Use the parametric drawing on this page to set the exact configuration (size, material, finish) and click "Request this configuration" — a specialist from Engineering Hardware will respond within one business day.