Model: 21311-28

Internal Wrenching Bolt

Properties:

Thread Class
3a
Thread Direction
Right-hand
Thread Length
0.537 inches
Fastener Length
4.688 inches
Head Style
Bevel-conical
Head Diameter
Between 0.521 inches and 0.531 inches
Head Height
0.312 inches
Internal Drive Style
Hexagon
Thread Diameter
0.312 inches
Width Across Flats
Between 0.219 inches and 0.221 inches
Thready Qty Per Inch (tpi)
24
Min. Tensile Strength (psi)
160000 pounds per square inch
Hardness Rating
34.0 rockwell c and 40.0 rockwell c
Material
Steel comp 4340 and steel comp 4140 and steel comp 8740 or steel comp 8735
Surface Treatment
Cadmium and chromate
Surface Treatment Specification
Qq-p-416, type 2, class 2 federal specification all treatment responses
Thread Series Designator
Unjf
NSN
5306-01-415-6734
Part Number
21311-28
Description
Bolt,internal Wrenching
CAGE
78062

An externally threaded fastener whose threaded portion is of one nominal diameter, no. 10 (0.190 in.) (5 mm) or larger. It is designed with an internal socket or internal multiple spline for use with an internal driver. The head is beveled (conical) or cylindrical in shape. Items with cylindrical shaped heads must have an externally relieved body. A locking feature may be incorporated in the design of the head or threads. See also screw, cap, socket head. Excludes setscrew; screw, shoulder; bolt, shoulder; screw, externally relieved body; bolt, externally relieved body; and screw, machine.

Part 21311-28 NSN 5306-01-415-6734

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
06666
FIIG:
A003B0
Concept No.:
App. Key:
BM
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:
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
0.5000lbs
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:
574
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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