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Technical Data Sheet
PartsTable / COMPONENT / L1143
L1143 ✓ 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 RING SET,PISTON is a the manufacturer industrial component. Key specifications include head_style: HEXAGON, grip_length: 1.750 INCHES NOMINAL IN, head_height: 0.273 INCHES MINIMUM AND 0.289 INCHES MAXIMUM IN, thread_class: 2A A, thread_length: 0.750 INCHES MINIMUM IN, fastener_length: 2.500 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-285-1368, 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
L1143
NSN: 5306-00-285-1368
FSC: 5306
CAGE: ZA045 — WILLIAM ADAMS PTY LTD (AUS)
SPECIFICATIONS
head_styleHEXAGON
grip_length1.750 INCHES NOMINAL IN
head_height0.273 INCHES MINIMUM AND 0.289 INCHES MAXIMUM IN
thread_class2A A
thread_length0.750 INCHES MINIMUM IN
fastener_length2.500 INCHES NOMINAL IN
hardness_rating32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
features_providedFINISHED HEAD
width_between_flats0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
fsc_application_dataGASOLINE ENGINE NONAIRCRAFT
minimum_yield_strength145000 POUNDS PER SQUARE INCH LBS
NSN5306-00-285-1368
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: L1143 · 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
•
HARDNESS RATING: 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
HEAD HEIGHT: 0.273 INCHES MINIMUM AND 0.289 INCHES MAXIMUM IN
•
FASTENER LENGTH: 2.500 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 16
•
GRIP LENGTH: 1.750 INCHES NOMINAL IN
•
MINIMUM TENSILE STRENGTH: 150000 POUNDS PER SQUARE INCH LBS
TECHNICAL CHARACTERISTICS (FLIS)
HARDNESS RATING32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
HEAD HEIGHT0.273 INCHES MINIMUM AND 0.289 INCHES MAXIMUM IN
FASTENER LENGTH2.500 INCHES NOMINAL IN
THREAD QUANTITY PER INCH16
END ITEM IDENTIFICATIONLOGISTICS SUPPORT VESSEL
GRIP LENGTH1.750 INCHES NOMINAL IN
MINIMUM TENSILE STRENGTH150000 POUNDS PER SQUARE INCH LBS
NOMINAL THREAD DIAMETER0.375 INCHES IN
FEATURES PROVIDEDFINISHED HEAD
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
M1222RN12C48GFNNUpgraded Successor
successor cross-reference
successor
MIL-S-1222Upgraded Successor
successor cross-reference
successor
MIL-DTL-1222Upgraded Successor
successor cross-reference
successor
306-40172Upgraded Successor
successor cross-reference
successor
1D4703Upgraded Successor
successor cross-reference
successor
M1222RN14C260GCNZEUpgraded Successor
successor cross-reference
successor
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is L1143?
L1143 is a RING SET,PISTON.
What parts can replace L1143?
There are 12 known substitutes for L1143: M1222RN12C48GFNN, MIL-S-1222, MIL-DTL-1222 and 9 more. Substitute compatibility should be verified for your specific system.
Is L1143 still available?
L1143 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