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B185 — LEAD,TEST

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

B185: LEAD,TEST.

The LEAD,TEST is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: ROUND, neck_width: 0.245 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN, head_height: 0.125 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN, neck_length: 0.125 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN, thread_class: 2A A. This part is cataloged in the U.S.

Government catalog under NSN 5306-00-044-5623, 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
B185
NSN: 5306-00-044-5623
NIINs: 000445623, 000548024, 000572507, 000580518, 000891421, 000891425, 007024484, 009009653, 012123707, 012760728, 013076814
FSC: 5306 — Bolts
CAGE: 80204 — AMERICAN NATIONAL STANDARDS INSTITUTE INCORPORATED DBA AMERICAN NATIONAL STANDARDS INSTITUTE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleROUND
neck_width0.245 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
head_height0.125 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
neck_length0.125 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
thread_class2A A
head_diameter0.563 INCHES MINIMUM AND 0.594 INCHES MAXIMUM IN
thread_length0.750 INCHES MINIMUM IN
fastener_length2.719 INCHES MINIMUM AND 2.781 INCHES MAXIMUM IN
hardness_rating95.0 ROCKWELL B MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentZINC OVERALL
NSN5306-00-044-5623
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: B185 · 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
•
NECK LENGTH: 0.125 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.125 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
•
FASTENER LENGTH: 3.500 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM B633 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
THREAD LENGTH: 0.750 INCHES MINIMUM IN
•
HARDNESS RATING: 95.0 ROCKWELL B NOMINAL OVERALL
•
NOMINAL THREAD DIAMETER: 0.250 INCHES IN
•
HEAD STYLE: ROUND
TECHNICAL CHARACTERISTICS
NECK LENGTH0.125 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
HEAD HEIGHT0.125 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN
FASTENER LENGTH3.500 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM B633 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH0.750 INCHES MINIMUM IN
HARDNESS RATING95.0 ROCKWELL B NOMINAL OVERALL
NOMINAL THREAD DIAMETER0.250 INCHES IN
HEAD STYLEROUND
THREAD DIRECTIONRIGHT-HAND
NECK WIDTH0.245 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 4
ASME-B18.5Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
FF-B-584 TY1CL1STAGR1Reference document
Same NSN cross-reference
Reference document — Secondary reference
FF-B-584Reference document
Same NSN cross-reference
Reference document — Secondary reference
MS35751-26Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is B185?
B185 is a LEAD,TEST.
What parts can replace B185?
There are 4 known substitutes for B185: ASME-B18.5, FF-B-584 TY1CL1STAGR1, FF-B-584 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B185?
B185 is cataloged in the U.S. Government catalog under NSN 5306-00-044-5623. 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.