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HL218-6-3 — BOLT,SHOULDER

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

HL218-6-3: BOLT,SHOULDER.

The BOLT,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4130 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 8740 OVERALL, head_style: FLAT CHAMFER, head_height: 0.045 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.295 INCHES MINIMUM AND 0.315 INCHES MAXIMUM IN, thread_length: 0.325 INCHES MINIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-522-1813, 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
HL218-6-3
NSN: 5306-00-522-1813
FSC: 5306 — Bolts
CAGE: 92215 — HOWMET GLOBAL FASTENING SYSTEMS INC DIV TORRANCE OPERATIONS (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 8740 OVERALL
head_styleFLAT CHAMFER
head_height0.045 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN
thread_class3A A
head_diameter0.295 INCHES MINIMUM AND 0.315 INCHES MAXIMUM IN
thread_length0.325 INCHES MINIMUM IN
shoulder_shapeROUND FIRST SHOULDER
fastener_length0.503 INCHES MINIMUM AND 0.523 INCHES MAXIMUM IN
hardness_rating35.0 ROCKWELL C NOMINAL OVERALL
shoulder_length0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM FIRST SHOULDER IN
thread_directionRIGHT-HAND
shoulder_diameter0.217 INCHES MINIMUM AND 0.218 INCHES MAXIMUM FIRST SHOULDER IN
NSN5306-00-522-1813
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: HL218-6-3 · 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: 0.045 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.503 INCHES MINIMUM AND 0.523 INCHES MAXIMUM IN
•
SHOULDER LENGTH: 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM FIRST SHOULDER IN
•
SHOULDER DIAMETER: 0.217 INCHES MINIMUM AND 0.218 INCHES MAXIMUM FIRST SHOULDER IN
•
THREAD LENGTH: 0.325 INCHES MINIMUM IN
•
SHOULDER SHAPE: ROUND FIRST SHOULDER
•
HARDNESS RATING: 35.0 ROCKWELL C NOMINAL OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-6758 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6050 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6098 MIL SPEC 3RD MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 4TH MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.045 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN
FASTENER LENGTH0.503 INCHES MINIMUM AND 0.523 INCHES MAXIMUM IN
SHOULDER LENGTH0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM FIRST SHOULDER IN
SHOULDER DIAMETER0.217 INCHES MINIMUM AND 0.218 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH0.325 INCHES MINIMUM IN
SHOULDER SHAPEROUND FIRST SHOULDER
HARDNESS RATING35.0 ROCKWELL C NOMINAL OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6758 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6050 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6098 MIL SPEC 3RD MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 4TH MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.190 INCHES IN
HEAD STYLEFLAT CHAMFER
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 1
BACB30MD6A3Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 HL218-6-3?
HL218-6-3 is a BOLT,SHOULDER.
What parts can replace HL218-6-3?
There is 1 known substitute for HL218-6-3: BACB30MD6A3. Substitute compatibility should be verified for your specific system.
What is the NSN for HL218-6-3?
HL218-6-3 is cataloged in the U.S. Government catalog under NSN 5306-00-522-1813. 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.