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SLB187-4-12A — BOLT,SHEAR

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

SLB187-4-12A: BOLT,SHEAR.

The BOLT,SHEAR is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 718 OVERALL, head_style: DOUBLE HEXAGON EXTENDED WASHER, grip_length: 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN, head_height: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-329-7660, 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
SLB187-4-12A
NSN: 5306-01-329-7660
FSC: 5306 — Bolts
CAGE: 16258 — SPACE-LOK, INC. DBA SPACE-LOK INC DIV SPACE-LOK (USA)
SPECIFICATIONS
materialNICKEL ALLOY 718 OVERALL
head_styleDOUBLE HEXAGON EXTENDED WASHER
grip_length0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
head_height0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN
thread_length0.446 INCHES NOMINAL IN
surface_finish32.0 MICROINCHES THREADS
fastener_length1.181 INCHES MINIMUM AND 1.211 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
surface_treatmentALUMINUM AND CHROMATE OVERALL
width_between_flats0.318 INCHES NOMINAL IN
NSN5306-01-329-7660
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: SLB187-4-12A · 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
•
SURFACE FINISH: 32.0 MICROINCHES THREADS
•
EXTENDED WASHER THICKNESS: 0.026 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
•
FASTENER LENGTH: 1.181 INCHES MINIMUM AND 1.211 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-83488,TY2 CL3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
EXTENDED WASHER DIAMETER: 0.460 INCHES MINIMUM AND 0.470 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES THREADS
SURFACE FINISH32.0 MICROINCHES GRIP
SURFACE FINISH32.0 MICROINCHES BEARING SURFACE OF HEAD
EXTENDED WASHER THICKNESS0.026 INCHES MINIMUM AND 0.046 INCHES MAXIMUM IN
HEAD HEIGHT0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
FASTENER LENGTH1.181 INCHES MINIMUM AND 1.211 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-83488,TY2 CL3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
EXTENDED WASHER DIAMETER0.460 INCHES MINIMUM AND 0.470 INCHES MAXIMUM IN
THREAD LENGTH0.446 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
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 8
DF33004-4-12AReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
X384-4-12AReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
AIC1654-4-12ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
VS3318-4-12ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
MB210-4-12ASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
SII1182-4-12ASame 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 SLB187-4-12A?
SLB187-4-12A is a BOLT,SHEAR.
What parts can replace SLB187-4-12A?
There are 8 known substitutes for SLB187-4-12A: DF33004-4-12A, X384-4-12A, AIC1654-4-12A and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SLB187-4-12A?
SLB187-4-12A is cataloged in the U.S. Government catalog under NSN 5306-01-329-7660. 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.