Model: HR257-5-20L

Close Tolerance Screw

Special Features:

Dry film lube-threads only

Properties:

Thread Class
3a
Thread Direction
Right-hand
Thread Length
Between 0.532 inches and 0.582 inches
Fastener Length
Between 1.817 inches and 1.847 inches
Head Style
Flat countersunk
Head Diameter
Between 0.573 inches and 0.630 inches
Grip Diameter
Between 0.311 inches and 0.312 inches
Internal Drive Style
Offset cruciform (torque set)
Thread Diameter
0.312 inches
Grip Length
Between 1.240 inches and 1.260 inches
Thready Qty Per Inch (tpi)
24
Min. Tensile Strength (psi)
132000 pounds per square inch
Countersink Angle
Between 99.0 degrees and 101.0 degrees
Material
Cobalt comp mp-35-n
Material Specification
Smd 584 national specification 15th material response
Surface Treatment
Passivate
Surface Treatment Specification
Qq-p-35 federal specification single treatment response
Thread Series Designator
Unjf
NSN
5305-01-458-4851
Part Number
HR257-5-20L
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 HR257-5-20L NSN 5305-01-458-4851

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:
--
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:
093486
UFC:
48950
LTL:
RATING VARIABLE
LCL:
--
WCC:
573
TCC:
Z
SHC:
9
ACC:
Construction Materials

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Schedule B and Export
  • Schedule B: 8105900000
  • SITC: 69981
  • End Use: Finished metal shapes
  • NAICS: 331491
  • USDA: 1

Freight Class: Cobalt, wrought, and articles thereof

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