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Nuts · Floating & Anchor Nuts

Aerospace Corner Self-Locking Nutplates

4 catalogued sizes, dimensioned to MS21055 and NASM25027. Pick any row and the technical drawing redraws to it.

Aerospace Corner Self-Locking Nutplates to MS21055 and NASM25027: the full dimensional table is reproduced below. 4 sizes are held in the table below, and the technical drawing redraws to whichever row you select.

Standard
MS21055 and NASM25027
Catalogued sizes
4

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

Aerospace Corner Self-Locking Nutplates technical product image

Applications & Industries

What Aerospace Corner Self-Locking Nutplates are specified for, industry by industry. Stocked from 6-32 to 1/4-28 (screw size).

Industries that specify Aerospace Corner Self-Locking Nutplates

  • Avionics brackets Serviceable hardware attached near a panel corner.
  • Transport interiors Compact self-locking threads behind trim and access panels.
  • Aircraft skin panels Corner-mounted self-locking nutplates in confined panel edges.
  • Aerospace equipment bays Fixed threaded points where a two-lug floating basket will not fit.
  • Building services Threaded rod, channel and suspension assemblies.
  • Machine building & OEM The clamping counter-face on studs and bolts throughout an assembly.

Typical applications

  • holding a service screw captive at the back of a thin panel
  • matching corner length, hole spacing, width and nut height to MS21055
  • providing a fixed corner thread with self-locking torque
  • placing a nutplate where edge access limits the mounting pattern
  • 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 substitute a floating two-lug nutplate when the corner pattern must stay fixed to the specified spacing.

Full application guide: where Aerospace Corner 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 Corner 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 (MS21055 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)Mounting-hole spacing J (in)Width C (in)Nut height (in)Material optionsReference standard
6-320.6370.4860.3440.171cadmium-plated alloy steel or stainless steelMS21055 and NASM25027
8-320.637~0.8520.486~0.7070.344~0.5000.171~0.281cadmium-plated alloy steel or stainless steelMS21055 and NASM25027
10-320.637~0.8520.486~0.7070.344~0.5000.171~0.281cadmium-plated alloy steel or stainless steelMS21055 and NASM25027
1/4-280.637~0.8520.486~0.7070.344~0.5000.171~0.281cadmium-plated alloy steel or stainless steelMS21055 and NASM25027

Aerospace Corner Self-Locking Nutplates are nuts manufactured to MS21055 and NASM25027. This page lists the full dimensional range with the key specifications engineers need to select and specify them.

What Are Aerospace Corner Self-Locking Nutplates?

Aerospace Corner Self-Locking Nutplates are nuts defined by MS21055 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 Corner Self-Locking Nutplates are supplied to order. Pricing starts from approximately US$0.38 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.

Video: Aerospace Corner Self-Locking Nutplates

Third-party video, selected automatically for this topic. It is not produced by Engineering Hardware and is not a specification source — use the tables on this page for dimensional data.

Frequently Asked Questions

Which standard governs Aerospace Corner Self-Locking Nutplates?

Aerospace Corner Self-Locking Nutplates are manufactured to MS21055 and NASM25027. The dimensional values on this page follow that standard.

What sizes are available for Aerospace Corner Self-Locking Nutplates?

The table on this page lists 4 sizes for Aerospace Corner Self-Locking Nutplates, ranging from 6-32 to 1/4-28. Sizes outside the table can be quoted on request.

In which materials are Aerospace Corner Self-Locking Nutplates supplied?

Aerospace Corner 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 Corner 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.