Manufacturing Specifications

MIL-S-1222 / MIL-DTL-1222

Studs

TYPE I – FULL BODY
TYPE II – REDUCED
TYPE III – CONSTANT STRENGTH BODY

TYPE IV – CONTINUOUS THREAD

Type III Studs Styles


Style

A

B

C

D

Stud End
Thread

Class 5

Class 5

Class 3A

Class 3A

Nut End
Thread

Class 3A

Class 2A

Class 3A

Class 2A

Bolts

TYPE II – HEAVY HEX
TYPE III – HEAVY HEX STRUCTURAL

Screws

TYPE I – HEX CAP (FINISHED HEX BOLT)
TYPE II – HEX SOCKET CAP

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

FF-S-86
(SOCKET HEAD CAP SCREWS)

TYPE I – HEXAGON SOCKET, CYLINDRICAL HEAD (1936 SERIES)
TYPE III – INTERNAL MULTIPLE SPINE SOCKET, CYLINDRICAL HEAD (1936 SERIES)
TYPE IV – HEXAGON, SOCKET, FLAT COUNTERSUNK , 82° INCLUDED ANGLE
TYPE V – 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

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 – FILLLISTER 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.

FF-S-85
(HEX HEAD CAP SCREW)

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-200 Rev. B
(SETSCREWS: HEXAGON SOCKET)
Type 1 Only

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