Model: AS255B4-35

Close Tolerance Screw

Properties:

Thread Class
3a
Thread Direction
Right-hand
Thread Length
Between 0.277 inches and 0.328 inches
Fastener Length
Between 2.606 inches and 2.626 inches
Head Style
Flat chamfer
Head Diameter
Between 0.477 inches and 0.492 inches
Head Height
Between 0.126 inches and 0.141 inches
Locking Feature
Detent ball threads
Grip Diameter
Between 0.2487 inches and 0.2492 inches
Shank Unthreaded Hole Diameter
0.076 inches first hole and 0.086 inches first hole
Internal Drive Style
Slot
Thread Diameter
0.250 inches
Grip Length
Between 2.188 inches and 2.204 inches
Thready Qty Per Inch (tpi)
28
Min. Tensile Strength (psi)
63000 pounds per square inch
Distance From Head Largest Bearing Surface To Shank Hole Center
2.527 inches first hole and 2.547 inches first hole
Surface Finish
32.0 microinches bearing surface of head
Surface Finish
32.0 microinches grip
Material
Steel comp 302 spring or steel comp 631 spring
Material Specification
Astm a580 cond. A assn standard single material response spring
Surface Treatment
Passivate
Surface Treatment Specification
Qq-p-35 federal specification single treatment response
Thread Series Designator
Unjf
NSN
5305-01-198-3481
Part Number
AS255B4-35
Description
Screw,close Tolerance
CAGE
84256

Part AS255B4-35 NSN 5305-01-198-3481

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:
713
TCC:
Z
SHC:
9
ACC:
Construction Materials

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