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SII1188-12D27P — BOLT,CLOSE TOLERANCE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

SII1188-12D27P: BOLT,CLOSE TOLERANCE.

The BOLT,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 718 OVERALL, head_style: SPLINE DRIVE SHEAR HEAD, grip_length: 1.677 INCHES MINIMUM AND 1.697 INCHES MAXIMUM IN, head_height: 0.390 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.7480 INCHES MINIMUM AND 0.7490 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-349-0809, 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
SII1188-12D27P
NSN: 5306-01-349-0809
FSC: 5306 — Bolts
CAGE: 57928 — SONIC INDUSTRIES, INC. DBA SONIC INDUSTRIES INC DIV SONIC INDUSTRIES (USA)
SPECIFICATIONS
materialNICKEL ALLOY 718 OVERALL
head_styleSPLINE DRIVE SHEAR HEAD
grip_length1.677 INCHES MINIMUM AND 1.697 INCHES MAXIMUM IN
head_height0.390 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN
thread_class3A A
grip_diameter0.7480 INCHES MINIMUM AND 0.7490 INCHES MAXIMUM IN
thread_length0.914 INCHES NOMINAL IN
fastener_length2.586 INCHES MINIMUM AND 2.616 INCHES MAXIMUM IN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE OVERALL
head_minor_diameter1.096 INCHES NOMINAL IN
nominal_thread_diameter0.750 INCHES IN
NSN5306-01-349-0809
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: SII1188-12D27P · 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: 0.390 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN
•
FASTENER LENGTH: 2.586 INCHES MINIMUM AND 2.616 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.914 INCHES NOMINAL IN
•
SHANK UNTHREADED HOLE DIAMETER: 0.141 INCHES MINIMUM AND 0.146 INCHES MAXIMUM FIRST HOLE IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD DIAMETER: 0.750 INCHES IN
•
HEAD STYLE: SPLINE DRIVE SHEAR HEAD
TECHNICAL CHARACTERISTICS
HEAD HEIGHT0.390 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN
FASTENER LENGTH2.586 INCHES MINIMUM AND 2.616 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TYPE 2,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.914 INCHES NOMINAL IN
SHANK UNTHREADED HOLE DIAMETER0.141 INCHES MINIMUM AND 0.146 INCHES MAXIMUM FIRST HOLE IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.750 INCHES IN
HEAD STYLESPLINE DRIVE SHEAR HEAD
THREAD DIRECTIONRIGHT-HAND
GRIP LENGTH1.677 INCHES MINIMUM AND 1.697 INCHES MAXIMUM 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 7
X409-12D27PReference document
Same NSN cross-reference
Reference document — Secondary reference
MB209PB12DS7Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
VS3319-12D27PReference document
Same NSN cross-reference
Reference document — Secondary reference
MB209-12D27Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
123709-12D27PSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
VCJ001-12D27PReference document
Same NSN cross-reference
Reference document — Secondary reference
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 SII1188-12D27P?
SII1188-12D27P is a BOLT,CLOSE TOLERANCE.
What parts can replace SII1188-12D27P?
There are 7 known substitutes for SII1188-12D27P: X409-12D27P, MB209PB12DS7, VS3319-12D27P and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SII1188-12D27P?
SII1188-12D27P is cataloged in the U.S. Government catalog under NSN 5306-01-349-0809. 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.