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Technical Data Sheet
PartsTable / COMPONENT / 18A13988
18A13988 ✓ 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 STUD,SHOULDERED is a the manufacturer industrial component. Key specifications include material: STEEL, thread_length: 1.218 INCHES MAXIMUM NUT THREAD IN, overall_length: 3.710 INCHES MINIMUM AND 3.830 INCHES MAXIMUM IN, hardness_rating: 18.0 ROCKWELL C MINIMUM AND 28.0 ROCKWELL C MAXIMUM, shoulder_length: 0.190 INCHES MINIMUM AND 0.220 INCHES MAXIMUM IN, special_features: 0.125 IN. RADIUS BETWEEN WRENCH FLAT SHOULDER AND NUT END IN.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-00-637-0856, 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
18A13988
NSN: 5307-00-637-0856
FSC: 5307
CAGE: 23382 — FWD SEAGRAVE HOLDINGS LP (USA)
SPECIFICATIONS
materialSTEEL
thread_length1.218 INCHES MAXIMUM NUT THREAD IN
overall_length3.710 INCHES MINIMUM AND 3.830 INCHES MAXIMUM IN
hardness_rating18.0 ROCKWELL C MINIMUM AND 28.0 ROCKWELL C MAXIMUM
shoulder_length0.190 INCHES MINIMUM AND 0.220 INCHES MAXIMUM IN
special_features0.125 IN. RADIUS BETWEEN WRENCH FLAT SHOULDER AND NUT END IN
style_designatorSHOULDERED
thread_directionRIGHT-HAND NUT THREAD
shoulder_diameter1.120 INCHES MINIMUM AND 1.210 INCHES MAXIMUM IN
nominal_thread_size0.750 INCHES NUT THREAD IN
nut_end_shank_length1.030 INCHES MINIMUM AND 1.060 INCHES MAXIMUM IN
distance_across_flats0.910 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN
NSN5307-00-637-0856
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 18A13988 · 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
•
THREAD QUANTITY PER INCH: 16 STUD THREAD
•
THREAD LENGTH: 1.000 INCHES MAXIMUM STUD THREAD IN
•
STUD END SHANK LENGTH: 0.210 INCHES NOMINAL IN
•
MATERIAL: STEEL
•
NUT END SHANK DIAMETER: 0.783 INCHES MINIMUM AND 0.786 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND STUD THREAD
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH16 STUD THREAD
SPECIAL FEATURES0.125 IN. RADIUS BETWEEN WRENCH FLAT SHOULDER AND NUT END IN
THREAD LENGTH1.000 INCHES MAXIMUM STUD THREAD IN
STUD END SHANK LENGTH0.210 INCHES NOMINAL IN
THREAD LENGTH1.218 INCHES MAXIMUM NUT THREAD IN
MATERIALSTEEL
NUT END SHANK DIAMETER0.783 INCHES MINIMUM AND 0.786 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND STUD THREAD
NUT END SHANK LENGTH1.030 INCHES MINIMUM AND 1.060 INCHES MAXIMUM IN
HARDNESS RATING18.0 ROCKWELL C MINIMUM AND 28.0 ROCKWELL C MAXIMUM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
580R666H01Interchangeable
interchangeable cross-reference
interchangeable
13988Interchangeable
interchangeable cross-reference
interchangeable
R11275Interchangeable
interchangeable cross-reference
interchangeable
11275Interchangeable
interchangeable cross-reference
interchangeable
MS15698-10Interchangeable
interchangeable cross-reference
interchangeable
ASME B94.19Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 18A13988?
18A13988 is a STUD,SHOULDERED.
What parts can replace 18A13988?
There are 27 known substitutes for 18A13988: 580R666H01, 13988, R11275 and 24 more. Substitute compatibility should be verified for your specific system.
Is 18A13988 still available?
18A13988 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026