Specifications

MIL-S-1222 | MIL-DTL-1222

STUDS

TYPE I - FULL BODY

TYPE II - REDUCED

TYPE III - CONSTANT STRENGTH BODY

BOLTS

TYPE I - HEX

TYPE II - HEAVY HEX

TYPE III - HEAVY HEX STRUCTURAL

TYPE IV - ROUND HEAD

TYPE V - ROUND HEAD SQUARE NECK

NUTS

TYPE I - HEX

TYPE II - HEX JAM

TYPE III - HEAVY HEX

TYPE IV - HEAVY HEX JAM

TYPE V - HEX SLOTTED

STYLE A - WASHER FACED

STYLE B - DOUBLE CHAMFERED

STYLE	STUD END THREAD	NUT END THREAD
A	CLASS 5	CLASS 3A
B	CLASS 5	CLASS 2A
C	CLASS 3A	CLASS 3A
D	CLASS 3A	CLASS 2A
TYPE IV - CONTINUOUS THREAD

SCREWS

TYPE 1 - HEX CAP (FINISHED HEX BOLT)

TYPE II - HEX SOCKET CAP

CLASS A - CARBON STEEL

STYLE 1 - LIGHT

STYLE 2 - REGULAR

STYLE 3 - HEAVY

STYLE 4 - EXTRA DUTY

STYLE 5 - HI-COLLAR

CLASS B - CORROSION RESISTANT STEEL MAGNETIC

STYLE 1 - LIGHT

STYLE 2 - REGULAR

STYLE 3 - HEAVY

CLASS C - CORROSION RESISTANT STEEL NON-MAGNETIC

STYLE 1 - LIGHT

STYLE 2 - REGULAR

STYLE 5 - HI-COLLAR

CLASS D - ALUMINUM-ZINC ALLOY

STYLE 1 - MEDIUM

CLASS E - PHOSPHOROUS BRONZE OR TIN BRASS

STYLE 1 - LIGHT

STYLE 2 - REGULAR

GLASS G - NICKEL-COPPER ALUMINUM ALLOY (K-MONEL)

STYLE 1 - LIGHT

STYLE 2 - REGULAR

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

1/TYPE I - HEXAGON SOCKET, CYLINDRICAL HEAD (1936 SERIES)

1/TYPE III - INTERNAL MULTIPLE SPINE SOCKET FLAT COUNTERSUNK HEAD 82" INCLUDED ANGLE

TYPE VI - HEXAGON SOCKET, CYLINDRICAL HEAD (1960 SERIES)

TYPE VII - INTERNAL MULTIPLE SPINE SOCKET, CYLINDRICAL HEAD (1960 SERIES)

TYPE VIII - HEXAGON SOCKET, BUTTON HEAD

TYPE IX - INTERNAL MULTIPLE SPINE SOCKET, BUTTON HEAD

1/ DO NOT USE FOR NEW DESIGN

FF-S-92 (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 HEAD 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

NOTE: USE OF CROSS-RECESSED DESIGN II IS NOT RECOMMENDED

TYPE:

A - ROUND WASHER

B - ROUND WASHER

GRADE:

I - GENERAL ASSEMBLY PURPOSE WASHER

II - AERONAUTICAL ASSEMBLY PURPOSE WASHER

CLASS:

A - CARBON STEEL WASHER

B - CORROSION RESISTING STEEL WASHER

C - ALUMINUM ALLOY WASHER

D - ALUMINUM ALLOY WASHER

E - BRASS WASHER

F - COPPER WASHER

G - NICKEL-COPPER ALLOY WASHER

H - PLASTIC (NYLON) WASHER