Model: NAS1248-20

Shoulder Screw

Properties:

Thread Class
3a
Thread Direction
Right-hand
Thread Length
0.453 inches
Fastener Length
Between 1.688 inches and 1.718 inches
Head Style
Flat countersunk
Head Diameter
Between 0.951 inches and 1.014 inches
Shoulder Diameter
0.5141 inches first shoulder and 0.5151 inches first shoulder
Shoulder Length
1.240 inches first shoulder and 1.260 inches first shoulder
Internal Drive Style
High-torque
Thread Diameter
0.500 inches
Thready Qty Per Inch (tpi)
20
Min. Tensile Strength (psi)
160000 pounds per square inch
Countersink Angle
Between 99.0 degrees and 101.0 degrees
Shoulder Shape
Round first shoulder
Material
Steel comp 4140 or steel comp 4340 or steel comp 8735 or steel comp 8740 or steel comp 6150
Material Specification
Mil-s-5626 military specification 1st material response or mil-s-5000 military specification 2nd material response or mil-s-6098 military specification 3rd material response or mil-s-6049 military specification 4th material response or mil-s-8503 military specification 5th material response
Surface Treatment
Cadmium and chromate
Surface Treatment Specification
Qq-p-416, type 2, class 2 federal specification all treatment responses
Thread Series Designator
Unjf
Specification Data
80205-nas1248 professional/industrial association standard
NSN
5305-01-434-8161
Part Number
NAS1248-20
Description
Screw,shoulder
CAGE
80205

An externally threaded fastener whose threaded portion is of one nominal diameter, no 0 (0.060 in.) (1.5 mm) or larger. It has a round unthreaded neck or shank all or part of which is of greater diameter than the threaded portion. The head is designed to be driven with either a wrench or an inserted driver or both in sizes below no. 10 (0.190 in.) (5 mm) nominal diameter. No. 10 (0.190 in.) (5 mm) and larger sizes must be designed for any type of inserted driver, but may also provide for external wrenching of the head. A locking feature may be incorporated in the design of the head or threads. For items which are both shouldered and have an externally relieved body, use screw, externally relieved body. For items with a no. 10 (0.190 in.) (5 mm) or larger thread diameter without an inserted driver head, use bolt, shoulder. Excludes bolt, internal wrenching and screw, cap, socket head.

Part NAS1248-20 NSN 5305-01-434-8161

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
22846
FIIG:
A003B0
Concept No.:
App. Key:
SL
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:
096640
UFC:
50600
LTL:
70.0
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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