PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 121-217
121-217 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The DIAPHRAGM,VALVE,FLAT is a the manufacturer industrial component. Key specifications include hole_diameter: 0.500 INCHES NOMINAL IN, outside_diameter: 9.500 INCHES NOMINAL IN, special_features: FABRIC REINFORCED, style_designator: FLAT, material_thickness: 0.132 INCHES NOMINAL IN, bolt_circle_diameter: 8.375 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-392-5364, 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
121-217
NSN: 5306-00-392-5364
FSC: 5306
CAGE: 10988 — CNH INDUSTRIAL AMERICA LLC DBA CNH AMERICA (USA)
SPECIFICATIONS
hole_diameter0.500 INCHES NOMINAL IN
outside_diameter9.500 INCHES NOMINAL IN
special_featuresFABRIC REINFORCED
style_designatorFLAT
bolt_hole_quantity8
material_thickness0.132 INCHES NOMINAL IN
bolt_circle_diameter8.375 INCHES NOMINAL IN
center_hole_diameter0.760 INCHES NOMINAL IN
NSN5306-00-392-5364
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 121-217 · 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
•
FASTENER LENGTH: 1.750 INCHES NOMINAL IN
•
WIDTH BETWEEN FLATS: 0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
•
FEATURES PROVIDED: FINISHED HEAD
•
THREAD CLASS: 2A A
•
MATERIAL: STEEL COMP 4024 OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD LENGTH: 1.000 INCHES MINIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
FASTENER LENGTH1.750 INCHES NOMINAL IN
WIDTH BETWEEN FLATS0.551 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
FEATURES PROVIDEDFINISHED HEAD
THREAD CLASS2A A
MATERIALSTEEL COMP 4024 OVERALL
THREAD DIRECTIONRIGHT-HAND
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD SINGLE MATERIAL RESPONSE OVERALL
THREAD LENGTH1.000 INCHES MINIMUM IN
THREAD QUANTITY PER INCH24
NOMINAL THREAD DIAMETER0.375 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
52228Upgraded Successor
successor cross-reference
successor
DM-2307Upgraded Successor
successor cross-reference
successor
A1287Upgraded Successor
successor cross-reference
successor
SMB586384Interchangeable
interchangeable cross-reference
interchangeable
34014Interchangeable
interchangeable cross-reference
interchangeable
GGG-W-660Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
Ready to buy 121-217?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 121-217?
121-217 is a DIAPHRAGM,VALVE,FLAT.
What parts can replace 121-217?
There are 15 known substitutes for 121-217: 52228, DM-2307, A1287 and 12 more. Substitute compatibility should be verified for your specific system.
Is 121-217 still available?
121-217 is currently cancelled.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 121-217

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026