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A-18906 — RING,RETAINING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

A-18906: RING,RETAINING.

The RING,RETAINING is a the manufacturer industrial component. Key specifications include material: STEEL, ring_style: SPIRAL, usage_design: EXTERNAL AND INTERNAL, inside_diameter: 8.637 INCHES MINIMUM AND 8.707 INCHES MAXIMUM IN, major_thickness: 0.082 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN, outside_diameter: 9.457 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-139-4295, 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
A-18906
NSN: 5325-01-139-4295
FSC: 5325 — Fastening Devices
CAGE: 11384 — KOLLMORGEN CORP (USA)
SPECIFICATIONS
materialSTEEL
ring_styleSPIRAL
usage_designEXTERNAL AND INTERNAL
inside_diameter8.637 INCHES MINIMUM AND 8.707 INCHES MAXIMUM IN
major_thickness0.082 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN
outside_diameter9.457 INCHES NOMINAL IN
surface_treatmentNICKEL
casehardening_indicatorNOT CASEHARDENED
cross-sectional_shape_styleDOUBLE OVAL
NSN5325-01-139-4295
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: A-18906 · 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
•
USAGE DESIGN: EXTERNAL AND INTERNAL
•
CROSS-SECTIONAL SHAPE STYLE: DOUBLE OVAL
•
OUTSIDE DIAMETER: 9.457 INCHES NOMINAL IN
•
MAJOR THICKNESS: 0.082 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN
•
INSIDE DIAMETER: 8.637 INCHES MINIMUM AND 8.707 INCHES MAXIMUM IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
RING STYLE: SPIRAL
•
SURFACE TREATMENT: NICKEL
TECHNICAL CHARACTERISTICS
USAGE DESIGNEXTERNAL AND INTERNAL
CROSS-SECTIONAL SHAPE STYLEDOUBLE OVAL
OUTSIDE DIAMETER9.457 INCHES NOMINAL IN
MAJOR THICKNESS0.082 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN
INSIDE DIAMETER8.637 INCHES MINIMUM AND 8.707 INCHES MAXIMUM IN
CASEHARDENING INDICATORNOT CASEHARDENED
RING STYLESPIRAL
SURFACE TREATMENTNICKEL
MATERIALSTEEL
OTHER ITEMS IN FSC 5325 — Fastening Devices
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5325-00-000-1884 5325-00-000-9988 5325-00-001-1567 5325-00-001-2043 5325-00-001-3842 5325-00-001-3858 5325-00-001-3871 5325-00-001-4317
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 A-18906?
A-18906 is a RING,RETAINING.
What is the NSN for A-18906?
A-18906 is cataloged in the U.S. Government catalog under NSN 5325-01-139-4295. 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.