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Technical Data Sheet
PartsTable / COMPONENT / H31-771
H31-771 ✓ Verified by PartsTable
— · BALL BEARING
WHAT YOU NEED TO KNOW
2RS = sealed for life, ZZ = shielded re-greaseable ABEC grade: higher = tighter tolerance
ABEC-1 standard, ABEC-7+ for precision spindles
PRODUCT OVERVIEW

The CAP,PILLOW BLOCK is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, thread_direction: LEFT-HAND, nominal_thread_size: 0.625 INCHES IN, end_item_identification: 2541015610937, part_name_assigned_by_controlling_agency: NUT, JAM, 5/8"-18 LFT THREAD. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3130-00-358-0657, 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
H31-771
NSN: 3130-00-358-0657
FSC: 3130
CAGE: 35301 — DRESSER INDUSTRIES INC LEROI DIV (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
thread_classA
thread_directionLEFT-HAND
nominal_thread_size0.625 INCHES IN
end_item_identification2541015610937
part_name_assigned_by_controlling_agencyNUT, JAM, 5/8"-18 LFT THREAD
NSN3130-00-358-0657
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: H31-771 · OEM ⚠ VERIFY BEFORE ORDERING ABEC grade: higher = tighter tolerance = higher cost. ABEC-1 is standard, ABEC-7+ for precision spindles. Open, shielded (ZZ), and sealed (2RS) versions have different max RPM ratings ✓ BROKER TIP 2RS = sealed for life (no maintenance). ZZ = shielded, re-greaseable. Open = must lubricate on install. Common interchange: 6205-2RS = 6205-2RSR = 6205-DDU (same bearing, different suffix) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
N-40345-AInterchangeable
interchangeable cross-reference
interchangeable
MS39179-5Interchangeable
interchangeable cross-reference
interchangeable
10908Interchangeable
interchangeable cross-reference
interchangeable
AC2569Interchangeable
interchangeable cross-reference
interchangeable
169631Interchangeable
interchangeable cross-reference
interchangeable
1225Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is H31-771?
H31-771 is a CAP,PILLOW BLOCK.
What parts can replace H31-771?
There are 6 known substitutes for H31-771: N-40345-A, MS39179-5, 10908 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for H31-771?
H31-771 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3130-00-358-0657. 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