Anchor nuts, aka nut plates, nut plates or anchor plates, are terms used interchangeably and relate to stamped sheet metal fasteners with an internally threaded tube and a plate with two clearance holes for rivets. Initially designed and still extensively used in aerospace applications, they are today also used in automotive, motorsports, and many other industries in blind mounted panel applications where hex nuts cannot be used or an attached nut is required for ease of maintenance. Anchor nuts can be Fixed or Floating, the latter being easier to use due to their built-in nut (threaded hole) able to "float" slightly thus providing a convenient connection point for threaded rods, such as bolts, from the backside. In the case of fixed anchor nuts, the built-in nut is static (i.e. without the capability to “float”) and the threaded rod must be positioned perfectly over the hole. Self-locking anchor nuts are those with a built-in locking mechanism preventing them from loosening over time from vibrations.

They come in an extensive range of styles/configurations (fixed or floating, full size or miniatures, standard or reduced rivet spacing, single or double lug, corner, right-angled bodies, etc.), sizes, Imperial (in.) Unified or Metric ISO (M) thread types, materials (e.g. Carbon Steel, Steel alloys, CRES), finishes, such as Cadmium or Cadmium Free Zinc Nickel platings (compliant to EU Regulations) & protective coatings. Depending on their application, nut plates conform to different military, national & international aerospace or industrial standards including U.S. Military, ASME & ASTM, IFI, ANSI, ISO, the German DIN LN aerospace, British BS, Japanese JIS and others.

Fixed or floating anchor nuts in various styles, materials, finishes, and sizes are produced by different manufacurers, such as Howmet® Aerospace (formerly Arconic) offered as Howmet® Fastening Systems (HFS) under their different business units, Paolo Astori, and others. They can be supplied as respective OEM parts of their respective manufacturers or as parts of our own labelled (AVIATIONEU NEW ERA) product lines intended as cost-effective alternatives to the respective OEM products. Sold in pieces or packs of specified number of anchor nuts per pack indicated after the letters "PK" in the product SKU. 

Howmet® Fastening Systems (HFS) Anchor Nuts

Howmet® Aerospace Inc. (Howmet® Fastening Systems, HFS), formerly Arconic Inc., develops & manufactures high performance, engineered products & solutions for the aerospace, industrial gas turbine, commercial transportation and oil and gas markets. HFS product range under different brands offers the greatest breadth and depth of fastening solutions available including self-locking nuts, quick-release fasteners, draw latches, threaded inserts, lock-bolts, and structural blind fasteners. Alcoa Fastening Systems (Alcoa), a business unit of Howmet® Aerospace is one of the largest manufacturers of aerospace hardware in the world. Simmonds®, a Howmet® Aerospace business unit, specialises on self-locking & special nuts. Their self locking nuts come in different types (series) offered in different materials and sizes, and can be reused at least 15 times without affecting the nut's performance. Born for the world of aviation, Simmonds® self-locking nuts are lightweight and extremely durable, exhibit a very strong locking performance, resistance to heat and corrosion & can be used in a wide temperature range in demanding aerospace, rally & other applications.

Howmet® Aerospace (HFS) manufactures and offers through their different business units a wide range of anchor nuts, fixed or floating, in various types (styles), such as one or two-lug, corner or others, different materials, finishes, and sizes. They are intended for use in different aerospace and industrial applications. A non-exhaustive list of different anchor nuts offered by HFS is provided below. 

HFS K1000/MK1000 Series Fixed Self-Locking Two-Lug Nutplates

HFS K1000 series (full size) and MK1000 series (Miniature) fixed self-locking two-lug nut plates are made from cadmium plated carbon steel and are offered in different thread sizes, with plain rivet or countersunk rivet holes, with or without a dry film lube. Nut plates with a dry film lube are specified by the letter "L" while those with countersunk rivet holes are specified by the letter "K" in the end of the part number. They comform with MS 21047, NAS 680, NAS 1023A specifications. MS 21047 nut plates are superseded by NASM 21047 series.
Certification Details: MS 21047F, Military Specification Sheet: Nut, Self-Locking, Plate, Two Lug, Floating, Low Height Steel, 125 KSI FTU, 450°F (01 Feb 1994) [Superseded by NASM21047].

HFS F5000/F5001 Series Self-Locking Floating Two-Lug Nutplates

HFS F5000 Series floating  two-lug anchor nuts (nutplates) are made of C1050 carbon Steel per AMS5085 (UNS G10500) or 8740 alloy steel per AMS6322 (UNS G87400). Their basket is made from  C1050 carbon steel per AMS5085 (UNS G10500).
Thread profile is UNJ inch in accordance with SAE Aerospace Standard AS 8879.They are offered in the following finishes:
F5000 - Cadmium plate per AMS-QQ-P-416, Type II, Class 2 plus Kaylube molybdenum disulfide dry film lubricant per AS5272, Type I.
F5000X - Cadmium plate per AMS-QQ-P-416, Type II, Class 2.
F5000-CW - Cadmium plate per AMS-QQ-P-416, Type II, Class 2 and carbowax.
They are superseded by NASM 21059 series.
Certification Details: MS21059J, Military Specification Sheet: Nut, Self-Locking, Plate, Two Lug, Floating, Low Height Steel, 125 KSI FTU, 450°F (01 Feb 1994) [Superseded by NASM 21059].

HFS F5001 Series floating  two-lug anchor nuts are made of A286 corrosion resistant steel per AMS 5255, or AMS 5732. Thread profile is UNJ inch in accordance with SAE Aerospace Standard AS 8879. Nut is finished with Kaylube molybdenum disulfide dry lubricant coat per AS 5272, Type I. Basket is either passivated per AMS 2700 or Kaylube finished. Other features include:
Performance: NASM 25027
Floatability: .030 min. radially from centered position.
Temperature: 450°F
Variations:
"P" for bottom projection weld nibs. Example: F5001-4P.
"BC" for bottom countersunk rivet holes. Example: F5001-4BC.

HFS MF5000/MS21075 Self-Locking Floating Two-Lug Miniature Nutplates

HFS MF5000 / MS 21075 Series Μiniature floating two-lug nut plates are made from carbon steel and cadmium plated. Similar to F5000 / MS 21059 Series but with a reduced rivet spacing. They are superseded by NASM 21075 series.
Certification Details: MS21075H, Military Specification Sheet: Nut, Self-Locking, Plate, Two Lug, Floating, Low Height, Reduced Rivet Spacing, Steel, 125 KSI FTU, 450°F (28 Feb 1995) [Superseded by NASM21075].

FM5000 Series Metric Floating Two-Lug Nutplates

HFS FM5000 Series anchor nuts are floating  two-lug anchor nuts offered in Metric sizes. The are are made of C1050 carbon Steel per AMS 5085 (UNS G10500) specification. Thread profile is UNJ inch in accordance with ISO 5855/1.They are cadmium plated per AMS-QQ-P-416, Type II, Class 2 plus Kaylube molybdenum disulfide dry film lubricant per MIL-L-46010. They can be used to temperatures up to 235°C.

HFS Simloc® SF5005 Metric Floating Two-Lug Nutplates

HFS Simloc® SF5005 Series anchor nuts are Metric floating  two-lug anchor nuts made of Corrosion Resistant Steel (CRES) and silver plated in accordance with EN 2786. Thread profile is ISO M in accordance with NF L 05-220. They can be used to temperatures up to 800°F - 425°C. Their strength is 160KSI - 1100Mpa. 
Note: Metric threads are designated by the letter M followed by the nominal major diameter of the thread and the pitch in millimeters. For example M10 x 1.0 indicates that the major diameter of the thread is 10mm and the pitch is 1.0mm. 

HFS F6000 Standard / MF6000 Miniature Floating Self-Locking Right Angle Anchor Nuts

HFS F6000 Floating Self-Locking Right Angle Anchor Nuts and their MF6000 Miniature counterparts are made of carbon steel and cadmium plated. The basket and retainer of F6000 nutplates is manufactured from 300 series corrosion resistant steel. Both conform to NASM 25027 Standard. Offered in various Imperial (in.) UNJC-3B thread sizes. They can be used to temperatures up to 235°C. Their strength is 900Mpa. 

Some of HFS nutplates are listed in our Web Platform for Supplies and many more (not currently listed) can be offered through our network of co-operating suppliers. For additional information please refer to the respective product presentations at our Web Platform for Supplies (shop.aviationeu.supplies).