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GB511C8-18 — BOLT,SHEAR

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

GB511C8-18: BOLT,SHEAR.

The BOLT,SHEAR is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: DOUBLE HEXAGON, grip_length: 1.125 INCHES NOMINAL IN, head_height: 0.281 INCHES NOMINAL IN, thread_class: 3A A, grip_diameter: 0.4982 INCHES MINIMUM AND 0.4991 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-914-3239, 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
GB511C8-18
NSN: 5306-00-914-3239
FSC: 5306 — Bolts
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleDOUBLE HEXAGON
grip_length1.125 INCHES NOMINAL IN
head_height0.281 INCHES NOMINAL IN
thread_class3A A
grip_diameter0.4982 INCHES MINIMUM AND 0.4991 INCHES MAXIMUM IN
thread_length0.561 INCHES MINIMUM IN
fastener_length1.686 INCHES NOMINAL IN
hardness_rating51.0 ROCKWELL C MINIMUM AND 54.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentCADMIUM THREADS
width_between_flats0.741 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN
NSN5306-00-914-3239
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: GB511C8-18 · 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: 0.281 INCHES NOMINAL IN
•
FASTENER LENGTH: 1.686 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-8837 TY 1 CL 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.561 INCHES MINIMUM IN
•
HARDNESS RATING: 51.0 ROCKWELL C MINIMUM AND 54.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: SPS-M-107,FSCM 03680 MFR REF SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.500 INCHES IN
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.281 INCHES NOMINAL IN
FASTENER LENGTH1.686 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-8837 TY 1 CL 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-8837 TY 1 CL 3 MIL SPEC SINGLE TREATMENT RESPONSE THREADS
THREAD LENGTH0.561 INCHES MINIMUM IN
HARDNESS RATING51.0 ROCKWELL C MINIMUM AND 54.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONSPS-M-107,FSCM 03680 MFR REF SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.500 INCHES IN
HEAD STYLEDOUBLE HEXAGON
THREAD DIRECTIONRIGHT-HAND
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 4
VS2106-8-18Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
EWSB26-8A18Reference document
Same NSN cross-reference
Reference document — Secondary reference
BM55156-8-18AReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
AIC260-8A18Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 GB511C8-18?
GB511C8-18 is a BOLT,SHEAR.
What parts can replace GB511C8-18?
There are 4 known substitutes for GB511C8-18: VS2106-8-18, EWSB26-8A18, BM55156-8-18A and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for GB511C8-18?
GB511C8-18 is cataloged in the U.S. Government catalog under NSN 5306-00-914-3239. 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.