Part Number: 7S21-10-10

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CONDITION:
NS
BOEING COMPANY, THE43999
THREAD CLASS3A
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH0.469 INCHES MINIMUM
FASTENER LENGTH0.656 INCHES NOMINAL
HEAD STYLEFLAT COUNTERSUNK
HEAD DIAMETER0.371 INCHES MINIMUM AND 0.385 INCHES MAXIMUM
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
NOMINAL THREAD DIAMETER0.190 INCHES
THREAD QUANTITY PER INCH32
HARDNESS RATING26.0 ROCKWELL C MINIMUM AND 27.0 ROCKWELL C MAXIMUM
COUNTERSINK ANGLE99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
SCREW MATERIALSTEEL COMP 302
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-7720 MIL SPEC SINGLE MATERIAL RESPONSE
SCREW SURFACE TREATMENTPASSIVATE
THREAD SERIES DESIGNATORUNF
An externally threaded fastener whose threaded portion is of one nominal diameter, No ( . 6 in./1.5 mm) or larger, designed to be held or driven with either a wrench or an inserted driver or both (excluding internal socket or internal multiple spline types), in sizes below No. 1 ( .19 in./5 mm). No. 1 and larger sizes must have a head designed for any type inserted driver (excluding internal socket or internal multiple spline types), but may also be designed for external wrenching. A locking feature may be incorporated in the design of the head or threads. Excludes BOLT, CLEVIS; BOLT, EXTERNALLY RELIEVED BODY; SCREW, EXTERNALLY RELIEVED BODY; and SCREW, ASSEMBLED WASHER. See also, SCREW, INSTRUMENT; BOLT, MACHINE; BOLT, INTERNAL WRENCHING; and SCREW, CAP SOCKET HEAD.