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188549 — RING,PISTON

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

188549: RING,PISTON.

The RING,PISTON is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, seal_width: 30.2 MILLIMETERS NOMINAL MM, housing_bore_diameter: 80.0 MILLIMETERS NOMINAL MM, end_item_identification: CAPSTAN ASSEMBLY, accommodated_shaft_diameter: 40.0 MILLIMETERS NOMINAL MM, part_name_assigned_by_controlling_agency: SEAL,GREASE. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-018-8549, 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
188549
NSN: 5325-00-018-8549
NIINs: 000188549, 008104775, 015366450
FSC: 5325 — Fastening Devices
CAGE: 7X677 — GENERAL MOTORS LLC DBA GENERAL MOTORS LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
seal_width30.2 MILLIMETERS NOMINAL MM
special_featuresITEM HAS PRESSED STEEL RETAINER WITH DOUBLE ROWS OF BALL BEARINGS; THE STEEL IS 52100 STEEL; GREASE IS ADDED TO THIS SEAL
housing_bore_diameter80.0 MILLIMETERS NOMINAL MM
end_item_identificationCAPSTAN ASSEMBLY
accommodated_shaft_diameter40.0 MILLIMETERS NOMINAL MM
part_name_assigned_by_controlling_agencySEAL,GREASE
NSN5325-00-018-8549
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 188549 · 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
•
FLANGE OUTSIDE DIAMETER: 0.250 INCHES NOMINAL IN
•
BARREL OUTSIDE DIAMETER: 0.156 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY OVERALL
•
FLANGE STYLE: FLANGE
•
BARREL STYLE: STRAIGHT ROUND TYPE
•
BARREL HEIGHT: 0.188 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FLANGE OUTSIDE DIAMETER0.250 INCHES NOMINAL IN
BARREL OUTSIDE DIAMETER0.156 INCHES NOMINAL IN
MATERIALCOPPER ALLOY OVERALL
FLANGE STYLEFLANGE
BARREL STYLESTRAIGHT ROUND TYPE
BARREL HEIGHT0.188 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 2
216MR016P024Reference document
Same NSN cross-reference
Reference document — Secondary reference
R56Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 188549?
188549 is a RING,PISTON.
What parts can replace 188549?
There are 2 known substitutes for 188549: 216MR016P024, R56. Substitute compatibility should be verified for your specific system.
What is the NSN for 188549?
188549 is cataloged in the U.S. Government catalog under NSN 5325-00-018-8549. 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.