53 - Hardware and Abrasives
5310 Nuts & washers
5315 Nails, machine keys & pins
5325 Fastening devices
5330 Packing & gasket materials
5335 Metal screening
5340 Hardware, commercial
5342 Hardware, weapon system
5345 Disks & stones, abrasive
5350 Abrasive materials
5355 Knobs & pointers
5360 Coil, flat, leaf & wire springs
5365 Bushings, rings, shims & spacers
Hardware and Abrasives
5310 Nuts and Washers
Note Nuts and washers, including spe-
cially designed, are to be classified in this
FSC. a. Nuts are a small metal block
made in a variety of shapes such as
square and hexagonal which is drilled
and internally threaded. b. Washers are a
perforated piece of metal, leather, or
other materials of various shapes or
forms. They are used primarily as a seat
for a bolt, nut, screw, rivet or nail to dis-
tribute pressure and prevent endwise mo-
tion over an area and/or to prevent move-
ment between two parts by means of
restraining features created by the shape
of its edges.
Includes Locknuts; Eye Nuts; Plain Nuts;
Castellated Nuts; Wing Nuts; Plate Nuts;
Push on Nuts; Concave and Convex
Washers; Flat Washers; Keyed Washers;
Lock Washers; Shouldered Washers;
Excludes Bearing Thrust Washers (FSC
3120); Shims (FSC 5365); Ring Spacers
(FSC 5365); Plate Spacers (FSC 5365);
Lock Rings (FSC 5365).
5315 Nails, Machine Keys, and Pins
Note Nails, machine keys, and pins,
including specially designed, will be clas-
sified in this FSC. a. Nails are slender,
usually pointed fasteners with a head,
and designed for insertion by impact. b.
Machine keys are items generally in-
serted between two items, usually in a
groove, to prevent relative rotation e.g.,
shaft and hub. c. Pins are cylindrical items
of various materials used to align/attach
two or more parts together and may allow
for angular movement.
Includes Dowel Pins, Split Pins; Spikes;
Tacks; Nonoffice Type Staples; Machine
Keys; Brads; Shouldered Pins; Cotter
Excludes Shafts (FSC 3040); Lock Keys
5325 Fastening Devices
Includes Eyelets; Grommets; Aircraft
Cowling Fasteners; Textile Fasteners; Re-
taining Rings; Threaded Inserts.
5330 Packing and Gasket Materials
Note This FSC includes only seals and
gaskets designed for standard use.
Seals, gaskets and packing are made
from materials specifically designed and
constructed to resist deterioration from
the action of heat, gas, chemicals, liquids,
and used to fill a cavity and create a tight
seal. Similar materials used to make
seals, gaskets, and packing are available
in bulk form, refer to FSG 93, FSG 80,
and FSG 83.
Includes General Purpose Oil Grease,
Air, Liquid, Gas, and chemical Seals; Oa-
kum; Prefabricated Gaskets and Seals
designed for a single specific application.
Excludes O-Rings (FSC 5331); Bulk ma-
terial items, such as; Rubber, Cork, and
Asbestos Sheets and Strips (FSG 93);
Liquid Gasket Materials (RTV, Permatex,
etc.) (FSG 80); RFI and EMI Seals and
Gaskets (FSC 5999), and all Seal Retain-
Excludes Packing and Gasket Material
5335 Metal Screening
Note Metal Screening is a perforated
plate or cylinder or a meshed wire fabric
usually mounted and used to separate
coarse from finer parts.
Includes Insect Screening; Industrial
Metal Cloth; Industrial Metal Mesh.
Excludes Fencing (FSC 5660).
5340 Hardware, Commercial
Note Common hardware designed pri-
marily for commercial use will be classi-
fied in this FSC. Hardware is the physical,
tangible and permanent components of
end items that may not be classified else-
where. It consists also of common items
that are commonly used in construction
and/or manufacturing (e.g., hinges, door
Includes Access Covers; Bumpers; Cast-
ers; Cabinet and Door Hardware; Clev-
ises; Hinges; Latches; Straps and Strap-
ping; Turnbuckles; Webbed Straps.
Excludes Weapons System Hardware
Note All brackets, including specially
designed for specific use an/or applica-
tion, will be classified in this FSC. Brack-
ets are items of rigid construction that
sustain a secondary item.
Includes Angle Brackets; Double Angle
Brackets; Mounting Brackets.
Excludes Corner Braces (FSC 5340);
Braces (FSC 5340); Mending Plates
5342 Hardware, Weapon System
Note Hardware designed for weapon
systems unique applications will be clas-
sified in this FSC.
Includes Adapters; Anchor Plates and
Straps; Anodes; Bellows; Couplings; Con-
trol Rods; Access Doors; Fairleads;
Mounts; Tie Rods; Yokes.
Excludes Commercial Hardware (FSC
5345 Disks and Stones, Abrasive
Includes Abrasive Belts and Belting;
Hones; Abrasive Wheels, Multiapplica-
Excludes Dental Abrasives; Abrasive
Cones, and other Abrasive Attachments
5350 Abrasive Materials
Includes Cloth; Papers; Powders; Abra-
sive Polishing Compounds; Metal Finish-
ing Abrasives; Industrial Diamonds; Dia-
mond Dust; Rouge.
5355 Knobs and Pointers
Includes Knobs, including Calibrated
Knobs; Dials, Scale.
5360 Coil, Flat, Leaf, and Wire Springs
Note-All springs, including specially
designed, will be classified in this FSC. A
spring is an elastic mechanical device
that regains its original shape after being
compressed, extended or deflected.
Includes Compression Springs; Torsion
Springs; Leaf Spring Assemblies; Flat
Springs; Extension Springs.
5365 Bushings, Rings, Shims, and Spacers
Note-All items, including specially de-
signed, will be classified in this FSC. a. A
bushing is cylindrical in shape, hollow,
and designed primarily to be inserted into
a hole to reduce the effective inside diam-
eter of the hole, and to protect the body
structure about the hole from damage
resulting from stress, strain, and vibra-
tion. b. A ring is cylindrical in shape, usu-
ally flat with a center hole. Rings are
multi-applicational. See specific item
name for designated usage. c. A shim is a
thin, sometimes tapered, piece of mate-
rial used to fill in space between things.
See specific item name for dimensional
parameters. d. A spacer is a device for
holding two members at a given distance
from each other.
Includes Externally Threaded Rings;
Keyed and Serrated Lock Rings; Dee
Rings; Instrument Retaining Rings; Shim
Sets and Assortments; Plate Spacers;
Ring Spacers; Sleeve Spacers; Stepped
Spacers; Spacer Sets and Assortments;
Sleeve Bushings; Machine Threaded
Bushings; Machine Threaded Plugs.
Excludes Sleeve Bearings (FSC 3120);
Pipe Threaded Plugs (FSC 4730); Piston
Rings (FSC 2520,
taining Rings (FSC 5325); Shim Stock