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121557-4-7R — SCREW,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

121557-4-7R: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL COMP H11 OVERALL, head_style: FLAT COUNTERSUNK, grip_length: 0.4375 INCHES NOMINAL IN, head_height: 0.108 INCHES NOMINAL IN, thread_class: 3A A, grip_diameter: 0.2641 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-693-7273, 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
121557-4-7R
NSN: 5305-01-693-7273
FSC: 5305 — Screws
CAGE: 80539 — SPS TECHNOLOGIES, LLC DBA AEROSPACE FASTENERS GROUP DIV AEROSPACE - SANTA ANA (USA)
SPECIFICATIONS
materialSTEEL COMP H11 OVERALL
head_styleFLAT COUNTERSUNK
grip_length0.4375 INCHES NOMINAL IN
head_height0.108 INCHES NOMINAL IN
thread_class3A A
grip_diameter0.2641 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM IN
head_diameter0.447 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN
thread_length0.370 INCHES NOMINAL IN
fastener_length0.7925 INCHES MINIMUM AND 0.8225 INCHES MAXIMUM IN
hardness_rating46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
countersink_angle99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
NSN5305-01-693-7273
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 121557-4-7R · 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
•
HEAD HEIGHT: 0.108 INCHES NOMINAL IN
•
FASTENER LENGTH: 0.7925 INCHES MINIMUM AND 0.8225 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-DTL-83488 TY II,CL 3 ION VAPOR DEPOSITED ALUMINUM COATING MIL SPEC 1ST TREATMENT RESPONSE AND AS5272 OR MIL-L-46040 TY I DRY FILM LUBRICANT APPLIED OVER ALUMINUM COATING ASSN STD 2ND TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.370 INCHES NOMINAL IN
•
HARDNESS RATING: 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
SINGLE SHEAR STRENGTH: ERR-060
•
NOMINAL THREAD DIAMETER: 0.2500 INCHES IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.108 INCHES NOMINAL IN
FASTENER LENGTH0.7925 INCHES MINIMUM AND 0.8225 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-DTL-83488 TY II,CL 3 ION VAPOR DEPOSITED ALUMINUM COATING MIL SPEC 1ST TREATMENT RESPONSE AND AS5272 OR MIL-L-46040 TY I DRY FILM LUBRICANT APPLIED OVER ALUMINUM COATING ASSN STD 2ND TREATMENT RESPONSE OVERALL
THREAD LENGTH0.370 INCHES NOMINAL IN
HARDNESS RATING46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SINGLE SHEAR STRENGTHERR-060
NOMINAL THREAD DIAMETER0.2500 INCHES IN
HEAD STYLEFLAT COUNTERSUNK
THREAD DIRECTIONRIGHT-HAND
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-000-0094 5305-00-000-1397 5305-00-000-2625 5305-00-000-3669 5305-00-000-3830 5305-00-000-3831
SUBSTITUTES & CROSS-REFERENCES 5
121557-4-A7BXSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
VT1693B4-7XReference document
Same NSN cross-reference
Reference document — Secondary reference
C7984B4-7RReference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
H044B4-7RSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
85TV1172B4-7RReference document
Same NSN cross-reference
Reference document — Secondary reference
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 121557-4-7R?
121557-4-7R is a SCREW,CLOSE TOLERANCE.
What parts can replace 121557-4-7R?
There are 5 known substitutes for 121557-4-7R: 121557-4-A7BX, VT1693B4-7X, C7984B4-7R and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 121557-4-7R?
121557-4-7R is cataloged in the U.S. Government catalog under NSN 5305-01-693-7273. 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.