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RS78 — RING,RETAINING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

RS78: RING,RETAINING.

The RING,RETAINING is a the manufacturer industrial component. Key specifications include material: STEEL, ring_style: SPIRAL, usage_design: EXTERNAL, inside_diameter: 0.741 INCHES NOMINAL IN, major_thickness: 0.030 INCHES NOMINAL IN, outside_diameter: 0.871 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5325-00-598-1356, 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
RS78
NSN: 5325-00-598-1356
FSC: 5325 — Fastening Devices
CAGE: 80756 — SPIROLOX INC (USA)
SPECIFICATIONS
materialSTEEL
ring_styleSPIRAL
usage_designEXTERNAL
inside_diameter0.741 INCHES NOMINAL IN
major_thickness0.030 INCHES NOMINAL IN
outside_diameter0.871 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
material_hardness_rating63.0 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 68.0 ROCKWELL SUPERFICIAL 30-N MAXIMUM
cross-sectional_shape_styleDOUBLE OVAL
material_document_and_classificationSAE 1070 THRU 1090 ASSN STD SINGLE MATERIAL RESPONSE
NSN5325-00-598-1356
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: RS78 · 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
•
MATERIAL HARDNESS RATING: 63.0 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 68.0 ROCKWELL SUPERFICIAL 30-N MAXIMUM
•
USAGE DESIGN: EXTERNAL
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE 1070 THRU 1090 ASSN STD SINGLE MATERIAL RESPONSE
•
CROSS-SECTIONAL SHAPE STYLE: DOUBLE OVAL
•
OUTSIDE DIAMETER: 0.871 INCHES NOMINAL IN
•
MAJOR THICKNESS: 0.030 INCHES NOMINAL IN
•
INSIDE DIAMETER: 0.741 INCHES NOMINAL IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
TECHNICAL CHARACTERISTICS
MATERIAL HARDNESS RATING63.0 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 68.0 ROCKWELL SUPERFICIAL 30-N MAXIMUM
USAGE DESIGNEXTERNAL
MATERIAL DOCUMENT AND CLASSIFICATIONSAE 1070 THRU 1090 ASSN STD SINGLE MATERIAL RESPONSE
CROSS-SECTIONAL SHAPE STYLEDOUBLE OVAL
OUTSIDE DIAMETER0.871 INCHES NOMINAL IN
MAJOR THICKNESS0.030 INCHES NOMINAL IN
INSIDE DIAMETER0.741 INCHES NOMINAL IN
CASEHARDENING INDICATORNOT CASEHARDENED
RING STYLESPIRAL
MATERIALSTEEL
SUBSTITUTES & CROSS-REFERENCES 6
800217Reference document
Same NSN cross-reference
Reference document — Secondary reference
MIL-DTL-27426Reference document
Same NSN cross-reference
Reference document — Identification reference
M2742610111ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
69984-78Reference document
Same NSN cross-reference
Reference document — Secondary reference
10598912-7Reference document
Same NSN cross-reference
Reference document — Secondary reference
800127Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is RS78?
RS78 is a RING,RETAINING.
What parts can replace RS78?
There are 6 known substitutes for RS78: 800217, MIL-DTL-27426, M2742610111A and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for RS78?
RS78 is cataloged in the U.S. Government catalog under NSN 5325-00-598-1356. 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.