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PartsTable / COMPONENT / 121890
121890 ✓ Verified by PartsTable
Hama · 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

CYLINDER ASSEMBLY,HYDRAULIC BRAK. Key specifications include material: IRON CAST BODY, bore_type: STRAIGHT, port_style: GASKET SEAL SINGLE PORT, bore_diameter: 1.000 INCHES NOMINAL IN, overall_width: 3.250 INCHES NOMINAL IN, overall_height: 1.500 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-012-1890, 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
121890
NSN: 5305-00-012-1890
FSC: 5305
CAGE: 21450 — ARMY WEAPONS COMMAND ATTN AMSWE-REE-S (USA)
SPECIFICATIONS
materialIRON CAST BODY
bore_typeSTRAIGHT
port_styleGASKET SEAL SINGLE PORT
bore_diameter1.000 INCHES NOMINAL IN
overall_width3.250 INCHES NOMINAL IN
overall_height1.500 INCHES NOMINAL IN
features_providedBLEEDER VALVES AND RUBBER BOOT
mounting_positionLEFT AND RIGHT
port_thread_class2B SINGLE PORT
mounting_provisionTHREADED MOUNTING HOLES
port_thread_diameter0.375 INCHES NOMINAL SINGLE PORT IN
body_outside_diameter1.325 INCHES NOMINAL IN
NSN5305-00-012-1890
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 121890 · Hama ⚠ 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
•
HARDNESS RATING: 100.0 ROCKWELL B MAXIMUM OVERALL
•
MATERIAL: STEEL OVERALL
•
WIDTH BETWEEN FLATS: 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
•
THREAD CLASS: 2A A
•
THREAD LENGTH: 0.719 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.719 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 20
•
HEAD HEIGHT: 0.150 INCHES MINIMUM AND 0.163 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
HARDNESS RATING100.0 ROCKWELL B MAXIMUM OVERALL
MATERIALSTEEL OVERALL
WIDTH BETWEEN FLATS0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN
THREAD CLASS2A A
THREAD LENGTH0.719 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
FASTENER LENGTH0.719 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH20
HEAD HEIGHT0.150 INCHES MINIMUM AND 0.163 INCHES MAXIMUM IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
MINIMUM TENSILE STRENGTH69000 POUNDS PER SQUARE INCH LBS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
52167Interchangeable
interchangeable cross-reference
interchangeable
SMB157010-2Interchangeable
interchangeable cross-reference
interchangeable
412365Interchangeable
interchangeable cross-reference
interchangeable
121890Interchangeable
interchangeable cross-reference
interchangeable
T8S25-50Interchangeable
interchangeable cross-reference
interchangeable
FD22902Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 121890?
121890 is a CYLINDER ASSEMBLY,HYDRAULIC BRAK manufactured by Hama.
What parts can replace 121890?
There are 9 known substitutes for 121890: 52167, SMB157010-2, 412365 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 121890?
121890 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-012-1890. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026