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Technical Data Sheet
PartsTable / COMPONENT / 18AX338
18AX338 ✓ 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: 1.062 INCHES NOMINAL STUD THREAD IN, overall_length: 3.469 INCHES NOMINAL IN, hardness_rating: 18.0 ROCKWELL C MINIMUM AND 28.0 ROCKWELL C MAXIMUM, shoulder_length: 0.188 INCHES NOMINAL IN, style_designator: SHOULDERED. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5307-00-514-6834, 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
18AX338
NSN: 5307-00-514-6834
FSC: 5307
CAGE: 76040 — MACK TRUCKS INC PARTS OPN (USA)
SPECIFICATIONS
materialSTEEL
thread_length1.062 INCHES NOMINAL STUD THREAD IN
overall_length3.469 INCHES NOMINAL IN
hardness_rating18.0 ROCKWELL C MINIMUM AND 28.0 ROCKWELL C MAXIMUM
shoulder_length0.188 INCHES NOMINAL IN
style_designatorSHOULDERED
thread_directionRIGHT-HAND NUT THREAD
shoulder_diameter1.125 INCHES NOMINAL IN
nominal_thread_size0.750 INCHES STUD THREAD IN
nut_end_shank_length0.875 INCHES NOMINAL IN
distance_across_flats0.938 INCHES NOMINAL IN
stud_end_shank_length0.115 INCHES NOMINAL IN
NSN5307-00-514-6834
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 18AX338 · 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 SERIES DESIGNATOR: UNS STUD THREAD
•
MATERIAL: STEEL
•
SHOULDER DIAMETER: 1.125 INCHES NOMINAL IN
•
DISTANCE ACROSS FLATS: 0.938 INCHES NOMINAL IN
•
STUD END SHANK LENGTH: 0.115 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.750 INCHES NUT THREAD IN
•
THREAD PITCH DIAMETERS: +0.7044 TO 0.7084 INCHES NUT THREAD IN
•
THREAD QUANTITY PER INCH: 16 NUT THREAD
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNS STUD THREAD
MATERIALSTEEL
SHOULDER DIAMETER1.125 INCHES NOMINAL IN
DISTANCE ACROSS FLATS0.938 INCHES NOMINAL IN
STUD END SHANK LENGTH0.115 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.750 INCHES NUT THREAD IN
THREAD PITCH DIAMETERS+0.7044 TO 0.7084 INCHES NUT THREAD IN
THREAD QUANTITY PER INCH16 NUT THREAD
THREAD QUANTITY PER INCH16 STUD THREAD
NOMINAL THREAD SIZE0.750 INCHES STUD THREAD IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
20X55Interchangeable
interchangeable cross-reference
interchangeable
TC10Interchangeable
interchangeable cross-reference
interchangeable
13097Interchangeable
interchangeable cross-reference
interchangeable
53248Interchangeable
interchangeable cross-reference
interchangeable
10148Interchangeable
interchangeable cross-reference
interchangeable
310-RTInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 18AX338?
18AX338 is a STUD,SHOULDERED.
What parts can replace 18AX338?
There are 27 known substitutes for 18AX338: 20X55, TC10, 13097 and 24 more. Substitute compatibility should be verified for your specific system.
Is 18AX338 still available?
18AX338 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