SCREW
P/N AS136-04-18
NSN 5305 01 167 5499
MFG AVI BANK

NEW GOV SURPLUS
SUPPLIER CAGE CODE 03EF7

ITEM NAME SCREW,CLOSE TOLERAN
DEFINITION A SCREW, MACHINE or SCREW, CAP, SOCKET HEAD whose unthreaded portion
is of specified grip length, plated or unplated, and is machined to a
tolerance of one thousandth (0.001 IN.) (0.025 mm) or less of a
specific diameter for items (1.000 IN.) (25 mm) or less in diameter.
Items over (1.000 IN.) (25 mm) in diameter shall have a tolerance of
fifteen ten thousandths (0.0015 IN.) (0.038 mm) or less. The nominal
major diameter of the threads shall be at least one thousandth (0.001
IN.) (0.025 mm) below the minimum shank diameter, but not below the
minimum major diameter for applicable class of fit, as shown in the
Screw Thread Standards, FED STD H28 and/or other nationally recognized
standards. The head is designed to be held or driven with an inserted
driver. It is not designed for rotation by the thumb and fingers. A
locking feature may be incorporated in the design of the head or
threads.

CHARACTERISTIC VALUE
THREAD CLASS 3A
THREAD DIRECTION RIGHT-HAND
THREAD LENGTH 1.419 INCHES MINIMUM AND 1.437 INCHES MAXIMUM
FASTENER LENGTH 1.543 INCHES MINIMUM AND 1.563 INCHES MAXIMUM
HEAD STYLE FLAT COUNTERSUNK
HEAD DIAMETER 0.497 INCHES MINIMUM AND 0.507 INCHES MAXIMUM
LOCKING FEATURE DETENT BALL GRIP
GRIP DIAMETER 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM
INTERNAL DRIVE STYLE OFFSET CRUCIFORM (TORQUE SET)
NOMINAL THREAD DIAMETER 0.250 INCHES
GRIP LENGTH 1.235 INCHES MINIMUM AND 1.266 INCHES MAXIMUM
THREAD QUANTITY PER INCH 28
HARDNESS RATING 39.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C
MAXIMUM OVERALL
COUNTERSINK ANGLE 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
MATERIAL STEEL COMP E4340 OR STEEL COMP 8740 OVERALL
MATERIAL DOCUMENT AND MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR
CLASSIFICATION MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
THREAD SERIES DESIGNATOR UNJF