Model: HT271-4-4

Close Tolerance Screw

Special Features:

Cetyl alcohol lubrication

Properties:

Thread Class
3a
Thread Direction
Right-hand
Thread Length
Between 0.443 inches and 0.510 inches
Fastener Length
Between 0.703 inches and 0.750 inches
Head Style
Flat countersunk undercut
Head Diameter
Between 0.5018 inches and 0.5066 inches
Head Height
Between 0.0713 inches and 0.0733 inches
Grip Diameter
Between 0.2490 inches and 0.2495 inches
Internal Drive Style
High-torque
End Application
F/a-18e/f hornet aircraft; harrier
Thread Diameter
0.250 inches
Grip Length
Between 0.240 inches and 0.260 inches
Thready Qty Per Inch (tpi)
28
Countersink Angle
100.0 degrees
Surface Finish
32.0 microinches grip
Surface Finish
32.0 microinches threads
Material
Titanium alloy
Material Specification
Ams 4967, comp 6al-4v assn standard single material response
Thread Series Designator
Unjf
NSN
5305-01-193-1611
Part Number
HT271-4-4
Description
Screw,close Tolerance
CAGE
73197

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.

Part HT271-4-4 NSN 5305-01-193-1611

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
29294
FIIG:
A003B0
Concept No.:
App. Key:
SS
Cond. Code:
1
Status:
A

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators
HMIC
PMIC
ESD/EMI
ENAC
MMAC
CRITL
HMIC:
N
PMIC:
A
ESD:
ESD:
MMAC:
SX
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
0.1000lbs
Item Weight:
--
Item Dim:
--
OPI
SPI No.
SPI Rev.
SPC Mkg.
LVL A
LVL B
OPI:
O
SPI No.:
SPI Rev.:
SPC Mkg:
00
LVL_A:
E
LVL_B:
Q

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
136500
UFC:
68455
LTL:
RATING VARIABLE
LCL:
--
WCC:
713
TCC:
Z
SHC:
9
ACC:
Construction Materials

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Schedule B and Export
  • Schedule B: 8109900000
  • SITC: 69987
  • End Use: Finished metal shapes
  • NAICS: 331491
  • USDA: 1

Freight Class: Zirconium and articles thereof nesoi

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