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14-20003-1 — BOLT,INTERNALLY RELIEVED BODY

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

14-20003-1: BOLT,INTERNALLY RELIEVED BODY.

The BOLT,INTERNALLY RELIEVED BODY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4340 OVERALL, head_height: 1.050 INCHES NOMINAL IN, thread_class: 3A A, thread_length: 1.572 INCHES MINIMUM AND 1.602 INCHES MAXIMUM IN, fastener_length: 5.072 INCHES MINIMUM AND 5.102 INCHES MAXIMUM IN, hardness_rating: 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-446-6527, 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
14-20003-1
NSN: 5306-00-446-6527
FSC: 5306 — Bolts
CAGE: 79U29 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL COMP 4340 OVERALL
head_height1.050 INCHES NOMINAL IN
thread_class3A A
thread_length1.572 INCHES MINIMUM AND 1.602 INCHES MAXIMUM IN
fastener_length5.072 INCHES MINIMUM AND 5.102 INCHES MAXIMUM IN
hardness_rating36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL
style_designatorCONCENTRIC HOLE UNTHREADED
thread_directionRIGHT-HAND
width_between_flats1.241 INCHES MINIMUM AND 1.251 INCHES MAXIMUM IN
concentric_hole_depth2.350 INCHES NOMINAL IN
nominal_thread_diameter1.250 INCHES IN
concentric_hole_diameter0.688 INCHES NOMINAL IN
NSN5306-00-446-6527
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 14-20003-1 · 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
•
EXTENDED WASHER THICKNESS: 0.256 INCHES NOMINAL IN
•
HEAD HEIGHT: 1.050 INCHES NOMINAL IN
•
FASTENER LENGTH: 5.072 INCHES MINIMUM AND 5.102 INCHES MAXIMUM IN
•
EXTENDED WASHER DIAMETER: 1.861 INCHES MINIMUM AND 1.871 INCHES MAXIMUM IN
•
CONCENTRIC HOLE DEPTH: 2.350 INCHES NOMINAL IN
•
THREAD LENGTH: 1.572 INCHES MINIMUM AND 1.602 INCHES MAXIMUM IN
•
HARDNESS RATING: 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL
•
STYLE DESIGNATOR: CONCENTRIC HOLE UNTHREADED
TECHNICAL CHARACTERISTICS
EXTENDED WASHER THICKNESS0.256 INCHES NOMINAL IN
HEAD HEIGHT1.050 INCHES NOMINAL IN
FASTENER LENGTH5.072 INCHES MINIMUM AND 5.102 INCHES MAXIMUM IN
EXTENDED WASHER DIAMETER1.861 INCHES MINIMUM AND 1.871 INCHES MAXIMUM IN
CONCENTRIC HOLE DEPTH2.350 INCHES NOMINAL IN
THREAD LENGTH1.572 INCHES MINIMUM AND 1.602 INCHES MAXIMUM IN
HARDNESS RATING36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL
STYLE DESIGNATORCONCENTRIC HOLE UNTHREADED
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER1.250 INCHES IN
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

No substitute or cross-reference records for this part.

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 14-20003-1?
14-20003-1 is a BOLT,INTERNALLY RELIEVED BODY.
What is the NSN for 14-20003-1?
14-20003-1 is cataloged in the U.S. Government catalog under NSN 5306-00-446-6527. 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.