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Extreme Bolt & Fastener has extensive experience and understanding of military specifications for fasteners whether standard parts or custom per-print. In addition, we are able to provide fasteners according to military material specifications (MS Spec and AN Spec fasteners) and to NAS aerospace specifications (NAS or NASM Spec fasteners) as well. Fasteners can also be made to meet DFAR compliance, meaning the metal used in fabrication must be melted or manufactured in the United States or a qualifying country.

Included in our realm of expertise are the following specifications. Please ask our experts regarding any additional specifications you require assistance with.

MS and AN Fasteners
In addition to the above specifications, we can also supply Mil Spec (MS) fasteners and Army Navy (AN) fasteners meeting the series below. Additional MS parts are available. Please contact our engineering team for assistance other MS part requirements.

Military: MS Fasteners
MS122083
MS14144
MS14181
MS14182
MS14183
MS14218
MS14491
MS15795
MS16212
MS16219
MS16562
MS16624
MS16625
MS16633
MS16995
MS16996
MS16997
MS16998
MS17825
MS17828
MS17829
MS17830
MS17986
MS19060
MS20006
MS20008
MS20073
MS20074
MS20392
MS20426
MS20427
MS20605
MS20756
MS20995
MS21043
MS21083
MS21090
MS21091
MS21092
MS21093
MS21097
MS21099
MS21207
MS21209
MS21250
MS21296
MS21301
MS21318
MS24621
MS24622
MS24625
MS24626
MS24627
MS24628
MS24629
MS24630
MS24667
MS24668
MS24671
MS24672
MS24693
MS24694
MS25087
MS27039
MS27183
MS27499
MS35190
MS35191
MS35198
MS35199
MS35202
MS35203
MS35206
MS35207
MS35212
MS35214
MS35215
MS35216
MS35221
MS35223
MS35226
MS35229
MS35233
MS35234
MS35239
MS35247
MS35249
MS35250
MS35264
MS35265
MS35266
MS35273
MS35274
MS35275
MS35276
MS35307
MS35308
MS35309
MS35310
MS35311
MS35335
MS35336
MS35337
MS35338
MS35649
MS35650
MS51479
MS51481
MS51490
MS51492
MS51493
MS51494
MS51575
MS51576
MS51830
MS51831
MS51832
MS51849
MS51850
MS51851
MS51861
MS51862
MS51896
MS51937
MS51957
MS51957
MS51958
MS51959
MS51960
MS51968
MS51972
MS51975
MS63540
MS63541
MS77068
MS9034
MS90726
MS90727
MS90728
MS9176
MS9321
MS9356
MS9360
MS9390
MS9393
MS9432
MS9456
MS9489
MS9490
MS9493
MS9494
MS9556
MS9557
MS9558
MS9633
MS9677
MS9696
MS9697
MS9698
MS9715
MS9716
MS9751
MS9783
Army Navy: AN Fasteners
AN10
AN123
AN1233
AN1234
AN1236
AN17
AN173
AN174
AN175
AN176
AN23
AN24
AN25
AN3
AN320
AN386
AN3C
AN3H
AN4
AN43
AN43B
AN44
AN4C
AN4H
AN5
AN500
AN501
AN502
AN503
AN504
AN505
AN507
AN508
AN509
AN510
AN515
AN520
AN525
AN526
AN530
AN531
AN535

Military Spec Fasteners

FF-B-561
FF-B-588
FF-N-836
FF-P-386
FF-S-85
FF-S-86
FF-S-92
FF-S-107
FF-S-111
FF-S-200
FF-S-210
FF-W-84
FF-W-92
FF-W-100
MIL-B-857
MIL-S-1222
MIL-DTL-1222
MIL-F-18240
MIL-DTL-18240
MIL-N-25027
MIL-DTL-25027
NASM 25027
MIL-F-19700
MIL-I-8846
MIL-N-25027/1
MIL-DTL-32258
MIL-P-10971
MIL-P-16610
MIL-P-21143
MIL-PRF-907F
MIL-S-21472
MIL-S-24149

FF-B-561
Mil spec FF-B-561 includes lag bolts having either a square head or a hex head.   

Type I – Gimlet point, screw thread
Type II – Cone point, screw thread
Type III – Cone point, fetter drive thread
    Style 1 – Hex head
    Style 2 – Square head

FF-B-588
Mil Spec FF-B-588 covers toggle bolts and screw expansion sleeves. 

Type I – Spring-wing toggle bolts, with two-piece wings
Class A – Sheet metal winds
    Style 1 – Machine screw
    Style 2 – Continuous thread stud
    Style 3 – Eyebolt

Class B – Wing wings
    Style 1 – Machine screw
    Style 2 – Continuous thread stud

Type II - Tumble-wing toggle bolts, with one-piece sheet metal wings
Class A - Pivoted bolts
    Style 1 – Machine screw
    Style 2 – Continuous thread stud
    Style 3 – Eyebolt

FF-N-836
Mil spec F-N-836 covers cap, castle, hexagon, knurled, slotted, square, welding and single ball seat nuts.

Type I – Nuts, square
    Style 1 – Regular
    Style 2 – Heavy
    Style 3 – Machine screw

Type II – Nuts, hexagon
    Style 4 – Plain
    Style 5 – Jam
    Style 6 – Thick
    Style 7 – Flat
    Style 8 – Flat jam
    Style 9 – Heavy flat
    Style 10 – Heavy flat jam
    Style 11 – Heavy
    Style 12 – Heavy jam
    Style 13 – Machine screw

Type III – Nuts, cap
    Style 14 – High crown
    Style 15 – Low crown

Type IV – Nuts, slotted
    Style 16 – Plain
    Style 17 – Thick
    Style 18 – Heavy

Type V – Nuts plain, castle
Type VII – Nuts plain, knurled
Type VIII – Nuts, welding
    Style 19 – Without pilot
    Style 20 – Pilot

Type VIII – Nuts, plain, single ball seat, hexagon

FF-P-386
FF-P-386 is superseded by ASME B18.8.1
Mil spec FF-P-386 covers split cotter pins.

FF-S-85
Mil spec FF-S-85 for fasteners covers types and styles of slotted and hexagon head cap screws.

Type I – Slotted Head
    Style 1s – Round head
    Style 2s – Flat countersunk head, 82˚
    Style 4s – Fillister head

Type II – Plain head
    Style 10p – Hexagon head

FF-S-86
Mil spec FF-S-86 covers socket head cap screw fasteners with optional hexagon and spline socket configurations.

    Type I – Hexagon socket, cylindrical head, 1936 series. *
    Type III – Internal multiple spline socket cylindrical head, 1936 series. *
    Type IV – Hexagon socket, flat countersunk head, 82˚ included angle.
    Type V – Internal multiple spline socket, flat countersunk head, 82˚ included angle.
    Type VI – Hexagon socket, cylindrical head, 1960 series.
    Type VII – Internal multiple spline socket, cylindrical head, 1960 series.
    Type VIII – Hexagon socket, button head.
    Type IX – Internal multiple spline socket, button head.
    * Do not use for new design.

FF-S-92
Mil spec FF-S-92C covers slotted, cross-recessed and hexagon head machine screws.

Type I - Slotted
    Style 1s – Round head
    Style 2s – Flat head, 82˚
    Style 3s – Flat head, 100˚
    Style 4s – Fillister head
    Style 5s – Fillister head, drilled
    Style 6s – Oval bead, 82˚
    Style 7s – Truss head
    Style 8s – Binding head
    Style 9s – Pan head
    Style 10s – Hexagon head

Type II – Hexagon, plain
    Style 10p – Hexagon

Type III - Cross-Recessed, Recess Designs I and II
    Style 1c - Round head.
    Style 2c - Flat head, 82˚
    Style 3c - Flat head, 100˚
    Style 4c - Fillister head
    Style 6c - Oval head, 82˚
    Style 7c - Truss head
    Style 8c - Binding head
    Style 9c - Pan head

FF-S-107
Mil spec FF-S-107 covers tooth lock washers for use in assemblies with bolts, studs, and machine screws.

Type I – Internal tooth flat
    Grade A – Regular
    Grade B – Heavy-Duty

Type II – External tooth flat
Type III – Internal -external tooth flat
Type IV – External tooth countersunk (80˚- 82˚)
Type V – External tooth countersunk (99˚- 101˚)
    Style 1 – Twisted teeth
    Style 2 – Teeth with up-and-down bent edges

FF-S-111
Mil spec FF-S-111 covers single and double-threaded wood screws with round, flat countersunk and oval countersunk heads having slotted or cross-recessed drives.

Types I – Single thread
Type II – Double thread

Styles:
    1s – Round head, slotted drive
    1c – Round head, cross-recessed drive
    2s – Flat countersunk head, slotted drive
    2c – Flat countersunk head, cross-recessed drive
    6s – Oval countersunk head, slotted drive
    6c – Oval countersunk head, cross-recessed drive

FF-S-200
Mil spec FF-S-200 covers hexagon socket and spline socket headless setscrews.

Types:
    Type I – Hexagon socket, headless
    Type II – Spline socket, headless

Styles. (Setscrews shall be of the following styles):
    Style 1 – Flat point
    Style 2 – Cone point
    Style 3 – Oval point
    Style 4 – Cup point
    Style 5 – Full-dog point
    Style 6 – Half-dog point

FF-S-210
Mil spec FF-S-210 covers set screws: square head (inch) and slotted (inch and metric).

Types:
    Type I – Square head, inch dimensions
    Type II – Slotted headless, inch dimensions
    Type III – Slotted headless, metric dimensions

Styles. (Setscrews shall be of the following styles):
    Style 1 – Flat point
    Style 2 – Cone point
    Style 3 – Oval point
    Style 4 – Cup point
    Style 5 – Full-dog point
    Style 6 – Half-dog point

FF-W-84
Mil spec FF-W-84 is for (spring) lock washers. This spec covers a helical spring type washer for us with nuts, bolts, screws, and studs to prevent them from loosening.

FF-W-92
Mil spec FF-W-92 covers plain, flat washers.

Type A – Round washer
Type B – Square wash

FF-W-100
Mil spec FF-W-100 covers tooth lock washers for use in assemblies with bolts, studs and machine screws.

Type I – Internal tooth flat
    Grade A - Regular
    Grade B – Heavy duty

Type II – External tooth flat
Type III – Internal-external tooth flat
Type IV – External tooth countersunk (80˚-82˚)
Type V – External tooth countersunk (99˚-101˚)
    Style 1 – Twisted teeth
    Style 2 – Teeth with up-and-down bent edges

MIL-DTL-1222, MIL-S-1222, and MIL-B-857
MIL-B-857 is superseded by MIL-S-1222; MIL-S-1222 is superseded by MIL-DTL-1222
Mil spec MIL-DTL-1222 covers standard studs, hex cap screws, and heavy hex bolts in nominal standard diameters of ¼ inch to 4 inches, nuts in nominal standard diameters of ¼ inch to 3 inches, and socket head cap screws in nominal standard diameters of ¼ inch to 1½ inches for applications where a high degree of reliability is required. MIL-DTL-1222 covers a variety of materials, including:  Nickel Alloys, Corrosion Resistant Steels (CRES), Titanium, and Aluminum.

Studs
    Type I – Full body
    Type II – Reduced body
    Type III – Constant strength body
    Type IV - Continuous thread (bolt-stud)

Bolts
    Type II – Heavy hex
    Type III – Heavy hex structural

Screws
    Type I – Hex cap
    Type II – Socket head cap

Nuts
    Type I – Hex
    Type II – Hex jam
    Type III – Heavy hex
    Type IV – Heavy hex jam
    Type V – Hex slotted

MIL-DTL-18240 and  MIL-F-18240
MIL-F-18240 is superseded by MIL-DTL-18240.
Mil spec MIL-DTL-18240 defines the requirements for self-locking elements for use in externally threaded fasteners such as bolts and screws to be used in fasteners with either UNC, UNJC, UNF, UNJF, UNRC or UNRF threads and where the temperatures will not exceed 250°F. It includes three types of self-locking elements:
    Type N – Plug/pellet
    Type L – Strip
    Type P – Patch

NASM 25027, MIL-DTL-25027 and MIL-N-25027
MIL-N-25027 is superseded by MIL-DTL-25027; MIL-DTL-25027 is superseded by NASM 25027.
Mil spec NASM25027 covers the requirements for steel, corrosion resistant steel (CRES), aluminum alloy, copper alloy and nickel-copper alloy (Monel 400) self-locking nuts.
    250˚F nuts
    450˚F nuts
    800˚F nuts

MIL-F-19700
Mil spec MIL-F-19700 describes the characteristics of nonmagnetic, screw threaded fasteners and related items that are dimensionally in conformance to recognized military and industrial standards. The intent of this specification is to supplement, not supersede, the specifications normally used for the acquisition of threaded fasteners and related items.

Bolts
    Type I – Round head
    Type II – Hexagon head
    Type III – Hexagon head, UNC-3A (for use with type V self-locking nuts)
    Type IV – Finished neck, countersunk, flat head

Machine screws
    Type I – Flat head, 82˚, cross recessed
    Type II – Pan head, cross recessed
    Type III – Fillister head, slotted and drilled
    Type IV – Flat head, 82˚, slotted
    Type V – Pan head, slotted

Wood screws
    Type I – Flat head, 82˚, cross recessed
    Type II – Round head, cross recessed
    Type III – Oval head, cross recessed
    Type IV – Flat head, 82˚, slotted
    Type V – Round head, slotted
    Type VI – Oval head, slotted

Lag screws
    Type I – Square bolt head
    Type II – Slotted countersunk head

Studs
    Type I – Full body

Nuts
    Type I – Hexagon, top chamfered, machine screw
    Type II – Hexagon, regular finished
    Type III – Hexagon, regular finished jam
    Type IV – Square, regular
    Type V – Hexagon, self locking nylon insert (Class C material only).

Cap screws
    Type I – Hexagon head

Pins
    Type I – Split cotter

Washers
    Type I – Metal, flat, plain, round
    Type II – Spring, nonlink lock
    Type III – Internal tooth, flat lock
    Type IV – External tooth, flat lock

MIL-I-8846
Mil spec MIL-I-8846 covers helical coil screw-thread inserts made from formed wire, the inner surfaces of which, after assembly, provide threads as specified.

Type I – Coarse thread
    Class 1 – Free running
    Class 2 – Screw locking (self-locking)

Type II – Fine thread
    Class 1 – Free running
    Class 2 – Screw locking (self-locking)

Type III – Taper pipe thread
    Class 5 – NPT pipe thread
    Class 6 – ANPT pipe thread

Type IV – Metric
    Class 3 – Staking (spark plug thread)

MIL-DTL-32258 and MIL-N-25027/1
MIL-N-25027/1 is superseded by MIL-DTL-32258.
Mil spec MIL-N-25027 covers the requirements for nickel-copper alloy (Monel 400 and 405), self-locking heavy hex nuts.

MIL-P-10971
Mil spec MIL-P-10971 covers tubular-shaped spring pins constructed to resist reduction in pin diameter by means of spring action.

Type I – Slotted
Type II – Coiled

Classes:
    Class 1 – Heavy duty
    Class 2 – Standard duty
    Class 4 – Light duty

MIL-P-16610
Mil spec MIL-P-16610 covers carbon, alloy and corrosion-resisting steel taper pins.

MIL-P-21143
Mil spec MIL-P-21143 covers solid, cylindrical, steel, headless straight pins, which are commonly referred to as dowel or machine pins.

MIL-PRF-907F
Mil spec MIL-PRF-907F covers antiseize compound for use on threads of steel nuts, studs, bolts and other mating surfaces, including those of superheated steam installations, at temperatures up to 1050 degrees Fahrenheit (°F) (566 degrees Celsius (°C)).

MIL-S-21472
Mil spec MIL-S-21472 covers hexagon socket-head shoulder screws and slotted-head shoulder screws. 

MIL-S-24149
Mil spec MIL-S-24149 covers studs for welding with stud welding equipment and arc shields (ferrules) for shielding studs where applicable.

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