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03-1278 — RING,RETAINING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

03-1278: RING,RETAINING.

The RING,RETAINING is a the manufacturer industrial component. Key specifications include end_item_identification: HEMATOLOGY ANALYZER, MODEL AC-T DIFF 2.. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-299-6170, 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
03-1278
NSN: 5325-01-299-6170
NIINs: 012996170, 014886653
FSC: 5325 — Fastening Devices
CAGE: K6111 — QIOPTIQ LTD (GBR)
SPECIFICATIONS
end_item_identificationHEMATOLOGY ANALYZER, MODEL AC-T DIFF 2.
part_name_assigned_by_controlling_agencyFILTER, AIR HYDROPHOBIC, PART NO.6232803; 0.45 MICRON, MALE LUER; COMPONENT OF HEMATOLOGY ANALYZER, MFG BY BECKMAN COULTER INC.
NSN5325-01-299-6170
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 03-1278 · 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
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USAGE DESIGN: INTERNAL
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MATERIAL DOCUMENT AND CLASSIFICATION: AISI 1074 ASSN STD SINGLE MATERIAL RESPONSE
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CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
OUTSIDE DIAMETER: 0.623 INCHES MINIMUM AND 0.627 INCHES MAXIMUM IN
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MAJOR THICKNESS: 0.009 INCHES MINIMUM AND 0.011 INCHES MAXIMUM IN
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INSIDE DIAMETER: 0.380 INCHES MINIMUM AND 0.400 INCHES MAXIMUM IN
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CASEHARDENING INDICATOR: NOT CASEHARDENED
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RING STYLE: INTERNAL SELF-LOCKING
TECHNICAL CHARACTERISTICS
USAGE DESIGNINTERNAL
MATERIAL DOCUMENT AND CLASSIFICATIONAISI 1074 ASSN STD SINGLE MATERIAL RESPONSE
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
OUTSIDE DIAMETER0.623 INCHES MINIMUM AND 0.627 INCHES MAXIMUM IN
MAJOR THICKNESS0.009 INCHES MINIMUM AND 0.011 INCHES MAXIMUM IN
INSIDE DIAMETER0.380 INCHES MINIMUM AND 0.400 INCHES MAXIMUM IN
CASEHARDENING INDICATORNOT CASEHARDENED
RING STYLEINTERNAL SELF-LOCKING
SURFACE TREATMENTPHOSPHATE ZINC
MATERIALSTEEL COMP 1074
SUBSTITUTES & CROSS-REFERENCES 1
5005-62 PPReference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 03-1278?
03-1278 is a RING,RETAINING.
What parts can replace 03-1278?
There is 1 known substitute for 03-1278: 5005-62 PP. Substitute compatibility should be verified for your specific system.
What is the NSN for 03-1278?
03-1278 is cataloged in the U.S. Government catalog under NSN 5325-01-299-6170. 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.