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Technical Data Sheet
PartsTable / COMPONENT / 900556
900556 ✓ 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 LOCKNUT,PIPE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, nut_style: PIPE LOCKNUT, nut_height: 0.19 INCHES NOMINAL IN, thread_series: NPSL, thread_direction: RIGHT-HAND, width_across_flats: 0.75 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-582-8487, 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
900556
NSN: 5305-00-582-8487
FSC: 5305
CAGE: 92392 — ALLIS-CHALMERS CORP (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
nut_stylePIPE LOCKNUT
nut_height0.19 INCHES NOMINAL IN
thread_seriesNPSL
thread_directionRIGHT-HAND
width_across_flats0.75 INCHES NOMINAL IN
nominal_thread_size0.125 INCHES IN
part_name_assigned_by_controlling_agencyLOW PRESSURE BRASS THREADED PIPE FITTING
NSN5305-00-582-8487
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 900556 · 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
•
HEAD DIAMETER: 0.334 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE 1
•
MINIMUM TENSILE STRENGTH: 60000 POUNDS PER SQUARE INCH LBS
•
HEAD STYLE: ROUND
•
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 1S STYLE
•
THREAD LENGTH: 0.313 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
•
THREAD SERIES DESIGNATOR: UNF
•
THREAD CLASS: 2A A
TECHNICAL CHARACTERISTICS (FLIS)
HEAD DIAMETER0.334 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
MINIMUM TENSILE STRENGTH60000 POUNDS PER SQUARE INCH LBS
HEAD STYLEROUND
NONDEFINITIVE SPEC/STD DATA1 TYPE AND 1S STYLE
THREAD LENGTH0.313 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
THREAD SERIES DESIGNATORUNF
THREAD CLASS2A A
NOMINAL THREAD DIAMETER0.190 INCHES IN
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
100763Interchangeable
interchangeable cross-reference
interchangeable
13216E0059Interchangeable
interchangeable cross-reference
interchangeable
202862Interchangeable
interchangeable cross-reference
interchangeable
30718-2Interchangeable
interchangeable cross-reference
interchangeable
153442Interchangeable
interchangeable cross-reference
interchangeable
6745Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 900556?
900556 is a LOCKNUT,PIPE.
What parts can replace 900556?
There are 20 known substitutes for 900556: 100763, 13216E0059, 202862 and 17 more. Substitute compatibility should be verified for your specific system.
Is 900556 still available?
900556 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