Model: A1-4826

Externally Relieved Body Screw

Properties:

Thread Class
2a
Thread Direction
Right-hand
Thread Length
0.472 inches
Fastener Length
2.558 inches
Head Style
Dee chamfer
Head Diameter
Between 0.389 inches and 0.393 inches
Head Height
Between 0.189 inches and 0.205 inches
Distance From Centerline To Flat
Between 0.154 inches and 0.156 inches
First Diameter From Head
0.250 inches
Second Diameter From Head
Between 0.197 inches and 0.205 inches
Third Diameter From Head
0.250 inches
Fourth Diameter From Head
Between 0.186 inches and 0.194 inches
Distance From Largest Bearing Surface Of Head To End Of First Diameter
0.125 inches
Distance From Largest Bearing Surface Of Head To End Of Second Diameter
Between 0.943 inches and 0.959 inches
Distance From Largest Bearing Surface Of Head To End Of Third Diameter
Between 1.486 inches and 1.518 inches
Distance From Largest Bearing Surface Of Head To End Of Fourth Diameter
Between 2.148 inches and 2.196 inches
Internal Drive Style
Cross recess type 1
Thread Diameter
0.250 inches
Thready Qty Per Inch (tpi)
20
Externally Relieved Body Diameter Quantity
4
Part Name Assigned By Controlling Agency
Navy special project
Material
Steel comp 4340
Material Specification
Sae assn standard single material response
Thread Series Designator
Unc
NSN
5305-00-979-8987
Part Number
A1-4826
Description
Screw,externally Relieved Body
CAGE
31949

An externally threaded fastener whose threaded portion is of one nominal diameter, and whose unthreaded portion has been machined or ground in one or more places or over its entire length to a maximum diameter less than the minimum pitch diameter of the thread (excludes undercut for thread relief). It is no. 0 (0.060 in.) (1.5 mm) or larger, and is designed to be held or driven with either a wrench or inserted driver (excluding internal socket and multiple spline types) or both in sizes below no. 10 (0.190 in.) (5 mm) and larger sizes must have a head designed for any type inserted driver (excluding internal socket and 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. See also bolt, externally relieved body and bolt, internal wrenching.

Part A1-4826 NSN 5305-00-979-8987

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
01852
FIIG:
A003B0
Concept No.:
App. Key:
SE
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:
U
ESD:
ESD:
MMAC:
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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Schedule B and Export
  • Schedule B: 7318152000
  • SITC: 69421
  • End Use: Iron and steel products, other
  • NAICS: 332722
  • USDA: 1

Freight Class: Bolts and bolts and their nuts or washers exported in the same shipment

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