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21237LF — BOLT,RING

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

21237LF: BOLT,RING.

The BOLT,RING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130 OVERALL, shank_length: 2.250 INCHES NOMINAL IN, thread_class: 3A A, thread_length: 2.250 INCHES NOMINAL IN, style_designator: SWIVEL, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-377-1544, 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
21237LF
NSN: 5306-01-377-1544
FSC: 5306 — Bolts
CAGE: 04368 — PURITAS METAL PRODUCTS INC (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OVERALL
shank_length2.250 INCHES NOMINAL IN
thread_class3A A
thread_length2.250 INCHES NOMINAL IN
style_designatorSWIVEL
thread_directionRIGHT-HAND
shoulder_diameter1.500 INCHES NOMINAL IN
surface_treatmentPRIMER OVERALL
eye_stock_diameter1.500 INCHES NOMINAL IN
ring_stock_diameter0.736 INCHES MINIMUM AND 0.781 INCHES MAXIMUM IN
nominal_thread_diameter1.125 INCHES IN
thread_quantity_per_inch12
NSN5306-01-377-1544
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 21237LF · 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
•
RING STOCK DIAMETER: 0.736 INCHES MINIMUM AND 0.781 INCHES MAXIMUM IN
•
EYE STOCK DIAMETER: 1.500 INCHES NOMINAL IN
•
THREAD LENGTH: 2.250 INCHES NOMINAL IN
•
SHANK LENGTH: 2.250 INCHES NOMINAL IN
•
STYLE DESIGNATOR: SWIVEL
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 1.125 INCHES IN
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
RING STOCK DIAMETER0.736 INCHES MINIMUM AND 0.781 INCHES MAXIMUM IN
EYE STOCK DIAMETER1.500 INCHES NOMINAL IN
THREAD LENGTH2.250 INCHES NOMINAL IN
SHANK LENGTH2.250 INCHES NOMINAL IN
STYLE DESIGNATORSWIVEL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER1.125 INCHES IN
THREAD DIRECTIONRIGHT-HAND
SHOULDER DIAMETER1.500 INCHES NOMINAL IN
SURFACE TREATMENTPRIMER OVERALL
OTHER ITEMS IN FSC 5306 — Bolts
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5306-00-001-1276 5306-00-001-1949 5306-00-001-1988 5306-00-001-1989 5306-00-001-1990 5306-00-001-1991 5306-00-001-1993 5306-00-001-2017
SUBSTITUTES & CROSS-REFERENCES 1
12417991Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 21237LF?
21237LF is a BOLT,RING.
What parts can replace 21237LF?
There is 1 known substitute for 21237LF: 12417991. Substitute compatibility should be verified for your specific system.
What is the NSN for 21237LF?
21237LF is cataloged in the U.S. Government catalog under NSN 5306-01-377-1544. 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.