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Socket Head Cap Screw

Model / MPN: 20771-001 FIND 33 | NSN: 5305-01-287-7525
ITAR Registered seal

An externally threaded fastener whose threaded portion is of one diameter. The head has an internal socket or multiple spline for use with an inserted driver. A locking feature may be incorporated in the design of the head or threads. Excludes items with bevel (conical) heads. See bolt, internal wrenching. Excludes screw, shoulder; and screw, machine.

Product Details
NATO Stock Number
5305-01-287-7525
Sold in multiples of
1 EA
DEMIL
NO
Thread Class
3a
Thread Direction
Right-hand
Thread Length
1.375 inches
Fastener Length
Between 4.920 inches and 5.000 inches
Head Style
Flat chamfer
Head Diameter
Between 0.642 inches and 0.656 inches
Head Height
Between 0.430 inches and 0.437 inches
Hole Diameter
Between 0.061 inches and 0.067 inches
Internal Drive Style
Hexagon
End Application
Deck machinery; towed array handling equipment; ssbn mk-118 fire control sys; los angeles class ssn (688); sturgeon class ssn (637); seawolf class ssn; sub control & navigation sys; sub armament & fire control; sub acoustic sonar sys; submarine hydraulic systems
Thread Diameter
0.438 inches
Width Across Flats
Between 0.375 inches and 0.379 inches
Hole Quantity
6
Hole Type
Drilled
Thready Qty Per Inch (tpi)
20
Min. Tensile Strength (psi)
180000 pounds per square inch
Hardness Rating
39.0 rockwell c and 45.0 rockwell c
Minimum Yield Strength
155000 pounds per square inch
Hole Configuration Style
Round internal hexagon
Material
Steel
Surface Treatment
Cadmium and chromate
Surface Treatment Specification
Qq-p-416 type 2 cl 2 federal specification single treatment response
Thread Series Designator
Unrf
Specification Data
80205-nas1351 professional/industrial association standard
20771 Series Parts

Pricing and Availability

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20771-001 FIND 33 Cross Reference
  • 8-52N-572-5-080
  • NAS1351-7H80P
  • 20863-001 FIND 32
  • 20778-004 FIND 38
  • 20789-001 FIND 50