Model: 28708L4C4

Setscrew

Properties:

Thread Class
3a
Thread Direction
Right-hand
Fastener Length
Between 0.240 inches and 0.260 inches
Head Style
Headless (setscrew)
Locking Feature
Strip threads
Point Style
Cup
Internal Drive Style
Hexagon
Thread Diameter
0.250 inches
Width Across Flats
0.125 inches
Thready Qty Per Inch (tpi)
20
Part Name Assigned By Controlling Agency
Navy special project
Material
Steel comp 301 fastener or steel comp 302 fastener or steel comp 302b fastener or steel comp 303 fastener or steel comp 303se fastener or steel comp 304 fastener or steel comp 304l fastener or steel comp 305 fastener or steel comp 308 fastener or steel comp 309 fastener or steel comp 309s fastener or steel comp 310 fastener or steel comp 310s fastener or steel comp 314 fastener or steel comp 316 fastener or steel comp 316l fastener or steel comp 317 fastener or steel comp 321 fastener or steel comp 347 fastener or steel comp 348 fastener or steel comp 384 fastener or steel comp 385 fastener
Material Specification
66 federal standard all material responses fastener
Surface Treatment
Passivate fastener
Surface Treatment Specification
Qq-p-35 federal specification single treatment response fastener
Thread Series Designator
Unrc
NSN
5305-01-250-0521
Part Number
28708L4C4
Description
Setscrew
CAGE
17077

An externally threaded device whose threaded portion is of one nominal diameter with or without a head and having a cup, cone, or other type of machined point designed to prevent or restrict relative movement of parts and designed to be driven with either a wrench or inserted driver. A locking feature may be incorporated in the design of the head or threads.

Part 28708L4C4 NSN 5305-01-250-0521

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
06672
FIIG:
A003B0
Concept No.:
App. Key:
SQ
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

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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