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88-20556 — SCREW,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

88-20556: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thickness: 0.062 INCHES NOMINAL IN, hole_diameter: 0.440 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN, outside_diameter: 0.776 INCHES MAXIMUM IN, overall_diameter: 0.487 INCHES NOMINAL IN, special_features: FEATURES: PHOSPHATE COATING: MECHANICALLY DEPOSITED ZINC. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-958-9544, 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
88-20556
NSN: 5305-00-958-9544
NIINs: 009589544, 015316129, 015320343, 015335198
FSC: 5305 — Screws
CAGE: 19203 — COMBAT CAPABILITIES DEVELOPMENT COMMAND (CCDC) ARMAMENTS CENTER DBA CCDC DIV US ARMY RESEARCH, DEVELOPMENT AND ENGINEERING COMMAND ARMAMENT (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.062 INCHES NOMINAL IN
hole_diameter0.440 INCHES MINIMUM AND 0.450 INCHES MAXIMUM IN
outside_diameter0.776 INCHES MAXIMUM IN
overall_diameter0.487 INCHES NOMINAL IN
special_featuresFEATURES: PHOSPHATE COATING: MECHANICALLY DEPOSITED ZINC
style_designatorSPLIT HELICAL-RIGHT HAND
surface_treatmentZINC OVERALL
material_thickness0.109 INCHES MINIMUM IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identification6115-01-296-1463
NSN5305-00-958-9544
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 88-20556 · 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
•
FASTENER LENGTH: 0.469 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.370 INCHES MINIMUM AND 0.420 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.112 INCHES IN
•
HEAD STYLE: FLAT COUNTERSUNK
•
THREAD DIRECTION: RIGHT-HAND
•
SCREW MATERIAL: COPPER ALLOY 230 OR COPPER ALLOY 240 OR COPPER ALLOY 260 OR COPPER ALLOY 268 OR COPPER ALLOY 342 OR COPPER ALLOY 353 OR COPPER ALLOY 360 OR COPPER ALLOY 377 OR COPPER ALLOY 764 OR COPPER ALLOY 270 OR COPPER ALLOY 274 OR COPPER ALLOY 510 OR COPPER ALLOY 745 OR COPPER ALLOY 752 OR COPPER ALLOY 770
•
MINIMUM TENSILE STRENGTH: 55000 POUNDS PER SQUARE INCH LBS
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
TECHNICAL CHARACTERISTICS
FASTENER LENGTH0.469 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN
THREAD LENGTH0.370 INCHES MINIMUM AND 0.420 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.112 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
SCREW MATERIALCOPPER ALLOY 230 OR COPPER ALLOY 240 OR COPPER ALLOY 260 OR COPPER ALLOY 268 OR COPPER ALLOY 342 OR COPPER ALLOY 353 OR COPPER ALLOY 360 OR COPPER ALLOY 377 OR COPPER ALLOY 764 OR COPPER ALLOY 270 OR COPPER ALLOY 274 OR COPPER ALLOY 510 OR COPPER ALLOY 745 OR COPPER ALLOY 752 OR COPPER ALLOY 770
MINIMUM TENSILE STRENGTH55000 POUNDS PER SQUARE INCH LBS
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
COUNTERSINK ANGLE99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
THREAD CLASS2A A
SUBSTITUTES & CROSS-REFERENCES 1
MS24693BB6Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 88-20556?
88-20556 is a SCREW,MACHINE.
What parts can replace 88-20556?
There is 1 known substitute for 88-20556: MS24693BB6. Substitute compatibility should be verified for your specific system.
What is the NSN for 88-20556?
88-20556 is cataloged in the U.S. Government catalog under NSN 5305-00-958-9544. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.