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21537 PIECE 190 — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

21537 PIECE 190: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include head_style: FLAT CHAMFER, thread_class: 3A A, head_diameter: 0.750 INCHES NOMINAL IN, thread_length: 0.438 INCHES NOMINAL IN, shoulder_shape: ROUND FIRST SHOULDER, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-185-0558, 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
21537 PIECE 190
NSN: 5306-01-185-0558
FSC: 5306 — Bolts
CAGE: 29899 — CALGON CARBON UV TECHNOLOGIES LLC DBA HYDE MARINE (USA)
SPECIFICATIONS
head_styleFLAT CHAMFER
thread_class3A A
head_diameter0.750 INCHES NOMINAL IN
thread_length0.438 INCHES NOMINAL IN
shoulder_shapeROUND FIRST SHOULDER
thread_directionRIGHT-HAND
shoulder_diameter0.375 INCHES NOMINAL FIRST SHOULDER IN
nominal_thread_diameter0.250 INCHES IN
NSN5306-01-185-0558
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 21537 PIECE 190 · 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
•
SHOULDER DIAMETER: 0.375 INCHES NOMINAL FIRST SHOULDER IN
•
THREAD LENGTH: 0.438 INCHES NOMINAL IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: FLAT CHAMFER
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD CLASS: 3A A
•
HEAD DIAMETER: 0.750 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SHOULDER DIAMETER0.375 INCHES NOMINAL FIRST SHOULDER IN
THREAD LENGTH0.438 INCHES NOMINAL IN
SHOULDER SHAPEROUND FIRST SHOULDER
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEFLAT CHAMFER
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS3A A
HEAD DIAMETER0.750 INCHES NOMINAL 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: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 21537 PIECE 190?
21537 PIECE 190 is a BOLT,SHOULDER.
What is the NSN for 21537 PIECE 190?
21537 PIECE 190 is cataloged in the U.S. Government catalog under NSN 5306-01-185-0558. 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.