PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 2018891
2018891 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The BOLT,MACHINE is a the manufacturer industrial component. Key specifications include head_style: HEXAGON, grip_length: 0.625 INCHES NOMINAL IN, head_height: 0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.406 INCHES MINIMUM IN, fastener_length: 1.031 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5306-00-144-3649, 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
2018891
NSN: 5306-00-144-3649
FSC: 5306
CAGE: S4956 — EMBRAER EMPRESA BRASILEIRA DE AERONAUTICA SA (BRA)
SPECIFICATIONS
materialSTEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 4130 OR STEEL COMP 4037 OVERALL
head_styleHEXAGON
grip_length0.625 INCHES NOMINAL IN
head_height0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
thread_class3A A
thread_length0.406 INCHES MINIMUM IN
fastener_length1.031 INCHES NOMINAL IN
hardness_rating26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
features_providedFINISHED HEAD
surface_treatmentCADMIUM AND CHROMATE OVERALL
width_between_flats0.365 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN
NSN5306-00-144-3649
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 2018891 · 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: 0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
•
WIDTH BETWEEN FLATS: 0.365 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN
•
MINIMUM TENSILE STRENGTH: 125000 POUNDS PER SQUARE INCH LBS
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
FASTENER LENGTH: 1.031 INCHES NOMINAL IN
•
HEAD STYLE: HEXAGON
•
NOMINAL THREAD DIAMETER: 0.190 INCHES IN
•
GRIP LENGTH: 0.625 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
HEAD HEIGHT0.109 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
WIDTH BETWEEN FLATS0.365 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN
MINIMUM TENSILE STRENGTH125000 POUNDS PER SQUARE INCH LBS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
FASTENER LENGTH1.031 INCHES NOMINAL IN
HEAD STYLEHEXAGON
NOMINAL THREAD DIAMETER0.190 INCHES IN
GRIP LENGTH0.625 INCHES NOMINAL IN
MATERIALSTEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8630 OR STEEL COMP 8735 OR STEEL COMP 4130 OR STEEL COMP 4037 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6050 MIL SPEC 3RD MATERIAL RESPONSE OR MIL-S-6098 MIL SPEC 4TH MATERIAL RESPONSE OR MIL-S-6758 MIL SPEC 5TH MATERIAL RESPONSE OR MIL-S-8695 MIL SPEC 6TH MATERIAL RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
400055Upgraded Successor
successor cross-reference
successor
579R796H12Interchangeable
interchangeable cross-reference
interchangeable
1006253-4Interchangeable
interchangeable cross-reference
interchangeable
81223S41-991ALT1PC12Interchangeable
interchangeable cross-reference
interchangeable
81223S41-984PC12Interchangeable
interchangeable cross-reference
interchangeable
BB55S61-01112PC12Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2018891?
2018891 is a BOLT,MACHINE.
What parts can replace 2018891?
There are 23 known substitutes for 2018891: 400055, 579R796H12, 1006253-4 and 20 more. Substitute compatibility should be verified for your specific system.
Is 2018891 still available?
2018891 is currently cancelled.
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Last verified: July 2026