1A20-493 — LOCK,VALVE SPRING RETAINER

✓ Government record, cited

— · COMPONENT

PRODUCT OVERVIEW

1A20-493: LOCK,VALVE SPRING RETAINER.

The LOCK,VALVE SPRING RETAINER is a the manufacturer industrial component. Key specifications include material: STEEL COMP E52100, chamfer_length: 0.111 INCHES NOMINAL IN, overall_height: 0.206 INCHES MINIMUM AND 0.207 INCHES MAXIMUM IN, style_designator: STRAIGHT BORE-ALL CORNERS CHAMFERED-STRAIGHT SIDES, thread_provision: UNTHREADED, casehardening_indicator: NOT CASEHARDENED. This part is cataloged in the U.S.

Government catalog under NSN 2805-00-814-5458, 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

1A20-493

NSN: 2805-00-814-5458
FSC: 2805 — Gasoline Reciprocating Engines, Except Aircraft; and Components
CAGE: 23382 — FWD SEAGRAVE HOLDINGS LP (USA)

SPECIFICATIONS

material	STEEL COMP E52100
chamfer_length	0.111 INCHES NOMINAL IN
overall_height	0.206 INCHES MINIMUM AND 0.207 INCHES MAXIMUM IN
style_designator	STRAIGHT BORE-ALL CORNERS CHAMFERED-STRAIGHT SIDES
thread_provision	UNTHREADED
casehardening_indicator	NOT CASEHARDENED
minimum_inside_diameter	0.284 INCHES IN
largest_outside_diameter	0.535 INCHES MINIMUM AND 0.540 INCHES MAXIMUM IN
metallic_hardness_rating	60.0 NOMINAL ROCKWELL C
largest_top_countersink_diameter	0.354 INCHES MINIMUM AND 0.374 INCHES MAXIMUM IN
largest_bottom_countersink_diameter	0.354 INCHES MINIMUM AND 0.374 INCHES MAXIMUM IN
material_document_and_classification	SAE 52100,FSCM 81343 ASSN STD SINGLE MATERIAL RESPONSE
NSN	2805-00-814-5458

COMPONENT DIAGRAM

KEY FEATURES

•

MINIMUM INSIDE DIAMETER: 0.284 INCHES IN

•

THREAD PROVISION: UNTHREADED

•

CHAMFER LENGTH: 0.111 INCHES NOMINAL IN

•

LARGEST OUTSIDE DIAMETER: 0.535 INCHES MINIMUM AND 0.540 INCHES MAXIMUM IN

•

LARGEST OUTSIDE DIAMETER CHAMFER ANGLE IN DEG: 45.0

•

LARGEST TOP COUNTERSINK DIAMETER: 0.354 INCHES MINIMUM AND 0.374 INCHES MAXIMUM IN

•

STYLE DESIGNATOR: STRAIGHT BORE-ALL CORNERS CHAMFERED-STRAIGHT SIDES

TECHNICAL CHARACTERISTICS

OVERALL HEIGHT	0.206 INCHES MINIMUM AND 0.207 INCHES MAXIMUM IN
MINIMUM INSIDE DIAMETER	0.284 INCHES IN
THREAD PROVISION	UNTHREADED
CHAMFER LENGTH	0.111 INCHES NOMINAL IN
LARGEST OUTSIDE DIAMETER	0.535 INCHES MINIMUM AND 0.540 INCHES MAXIMUM IN
LARGEST OUTSIDE DIAMETER CHAMFER ANGLE IN DEG	45.0
LARGEST TOP COUNTERSINK DIAMETER	0.354 INCHES MINIMUM AND 0.374 INCHES MAXIMUM IN
STYLE DESIGNATOR	STRAIGHT BORE-ALL CORNERS CHAMFERED-STRAIGHT SIDES
MATERIAL DOCUMENT AND CLASSIFICATION	SAE 52100,FSCM 81343 ASSN STD SINGLE MATERIAL RESPONSE
CASEHARDENING INDICATOR	NOT CASEHARDENED

SUBSTITUTES & CROSS-REFERENCES 7

600R507Reference document

Same NSN cross-reference

Reference document — Secondary reference

876285Reference document

Same NSN cross-reference

Reference document — Secondary reference

MIL-E-11275Reference document

Same NSN cross-reference

Reference document — Identification reference

154742Reference document

Same NSN cross-reference

Reference document — Secondary reference

MS13997-2Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

T4151206Reference document

Same NSN cross-reference

Reference document — Secondary reference

LIFECYCLE

NSN statusCancelled· U.S. Government catalog

Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required

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FREQUENTLY ASKED QUESTIONS

What is 1A20-493?

1A20-493 is a LOCK,VALVE SPRING RETAINER.

What parts can replace 1A20-493?

There are 7 known substitutes for 1A20-493: 600R507, 876285, MIL-E-11275 and 4 more. Substitute compatibility should be verified for your specific system.

What is the NSN for 1A20-493?

1A20-493 is cataloged in the U.S. Government catalog under NSN 2805-00-814-5458. This indicates validated use in U.S. government and defense supply chains.

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