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Technical Data Sheet
PartsTable / COMPONENT / 20506-25
20506-25 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: FILLISTER, head_height: 0.118 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN, thread_class: 2A A, head_diameter: 0.292 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN, thread_length: 0.312 INCHES NOMINAL IN, fastener_length: 0.312 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-013-2100, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
20506-25
NSN: 5305-00-013-2100
FSC: 5305
CAGE: 83298 — ALLIED SIGNAL INC AEROSPACE EQUIPMENT SYSTEMS EATONTOWN SITE (USA)
SPECIFICATIONS
head_styleFILLISTER
head_height0.118 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.292 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
thread_length0.312 INCHES NOMINAL IN
screw_materialSTEEL COMP 1010 OR STEEL COMP 1011 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020
fastener_length0.312 INCHES NOMINAL IN
internal_drive_styleSLOT
nominal_thread_diameter0.190 INCHES IN
screw_surface_treatmentCADMIUM OR ZINC
thread_quantity_per_inch32
thread_series_designatorUNF
NSN5305-00-013-2100
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 20506-25 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
SCREW SURFACE TREATMENT: CADMIUM OR ZINC
•
THREAD CLASS: 2A A
•
NOMINAL THREAD DIAMETER: 0.190 INCHES IN
•
INTERNAL DRIVE STYLE: SLOT
•
SCREW MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-633 FED SPEC ALL MATERIAL RESPONSES
•
THREAD SERIES DESIGNATOR: UNF
•
THREAD LENGTH: 0.312 INCHES NOMINAL IN
•
HEAD DIAMETER: 0.292 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
SCREW SURFACE TREATMENTCADMIUM OR ZINC
THREAD CLASS2A A
NOMINAL THREAD DIAMETER0.190 INCHES IN
INTERNAL DRIVE STYLESLOT
SCREW MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-633 FED SPEC ALL MATERIAL RESPONSES
THREAD SERIES DESIGNATORUNF
THREAD LENGTH0.312 INCHES NOMINAL IN
HEAD DIAMETER0.292 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
HEAD HEIGHT0.118 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH32
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
C050771CInterchangeable
interchangeable cross-reference
interchangeable
G5Interchangeable
interchangeable cross-reference
interchangeable
A1498Interchangeable
interchangeable cross-reference
interchangeable
MIL-I-14652Interchangeable
interchangeable cross-reference
interchangeable
MIL-DTL-14652BInterchangeable
interchangeable cross-reference
interchangeable
858820-001Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 20506-25?
20506-25 is a SCREW,MACHINE.
What parts can replace 20506-25?
There are 16 known substitutes for 20506-25: C050771C, G5, A1498 and 13 more. Substitute compatibility should be verified for your specific system.
Is 20506-25 still available?
20506-25 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026