Model: 491D12

Hexagon Head Cap Screw

Properties:

Thread Direction
Right-hand
Thread Length
0.690 inches
Fastener Length
1.060 inches
Head Style
Hexagon
Head Height
0.156 inches
Width Between Flats
Between 0.428 inches and 0.437 inches
Thread Diameter
0.250 inches
Nonstandard Thread Pitch Diameter
+0.2213/+0.2238 inches
Thready Qty Per Inch (tpi)
28
Surface Finish
63.0 microinches bearing surface of head
Surface Finish
63.0 microinches grip
Surface Finish
63.0 microinches threads
Material
Steel comp 302
Material Specification
Ams 5637 assn standard single material response
Surface Treatment
Passivate
Thread Series Designator
Unf
NSN
5305-00-531-9606
Part Number
491D12
Description
Screw,cap,hexagon Head
CAGE
0AHP5

An externally threaded fastener designed for insertion into holes in assembled parts, for mating with a preformed internal thread and for tightening or releasing by torquing the head. the threaded and unthreaded portions are both of the same nominal diameter of 0.190 inch (5 mm) or larger. head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. the thread length being the controlled dimension, the grip length is not specified. a locking feature may be incorporated in the design of the head or threads. the head is not designed to be held or driven with an inserted driver or by the thumb and fingers. excludes bolt,machine; bolt,externally relieved body; bolt,internal wrenching; and screw,cap,socket head.

Part 491D12 NSN 5305-00-531-9606

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
18257
FIIG:
A003B0
Concept No.:
App. Key:
SB
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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