Model: 55979-5-21

Shoulder Screw

Properties:

Thread Class
3a
Thread Direction
Right-hand
Thread Length
Between 0.506 inches and 0.573 inches
Fastener Length
Between 1.828 inches and 1.875 inches
Head Style
Flat countersunk
Head Diameter
Between 0.629 inches and 0.634 inches
Shoulder Diameter
0.342 inches first shoulder and 0.343 inches first shoulder
Shoulder Diameter
0.342 inches and 0.343 inches first shoulder
Shoulder Length
1.180 inches first shoulder and 1.202 inches first shoulder
Shoulder Length
1.180 inches and 1.202 inches first shoulder
Internal Drive Style
Offset cruciform (torque set)
Thread Diameter
0.312 inches
Thready Qty Per Inch (tpi)
24
Hardness Rating
24.0 rockwell c and 44.0 rockwell c
Hardness Rating
24.0 rockwell c and 44.0 rockwell c
Countersink Angle
100.0 degrees
Shoulder Shape
Round first shoulder
Part Name Assigned By Controlling Agency
Navy special project
Material
Iron alloy 660
Thread Series Designator
Unf
NSN
5305-00-227-1424
Part Number
55979-5-21
Description
Screw,shoulder
CAGE

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 55979-5-21 NSN 5305-00-227-1424

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:
U
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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