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REF4-4 — Technical Data Sheet

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— · 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 BEARING,PLAIN,ROD END is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1018 INTERNAL ROD END BODY, shank_style: INTERNALLY THREADED W/BEAD AND WRENCH FLATS AND INSPECTION HOLE, thread_class: 3B, bore_diameter: 0.2495 INCHES MINIMUM AND 0.2515 INCHES MAXIMUM IN, overall_length: 1.7400 INCHES MINIMUM AND 1.7960 INCHES MAXIMUM IN, hardness_rating: 60.0 ROCKWELL C MINIMUM INNER MEMBER. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 3120-00-236-6501, 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
REF4-4
NSN: 3120-00-236-6501
FSC: 3120
CAGE: 99528 — RADIAL BEARING CORPORATION DBA RADIAL BEARING CORP OF CONNECTICU DIV RADIAL BEARING LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 1018 INTERNAL ROD END BODY
shank_styleINTERNALLY THREADED W/BEAD AND WRENCH FLATS AND INSPECTION HOLE
thread_class3B
bore_diameter0.2495 INCHES MINIMUM AND 0.2515 INCHES MAXIMUM IN
overall_length1.7400 INCHES MINIMUM AND 1.7960 INCHES MAXIMUM IN
hardness_rating60.0 ROCKWELL C MINIMUM INNER MEMBER
thread_diameter0.250 INCHES NOMINAL IN
style_designatorBALL TYPE
thread_directionRIGHT-HAND
surface_treatmentCADMIUM ROD END BODY
inner_member_width0.4320 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN
outer_member_width0.2990 INCHES MINIMUM AND 0.3090 INCHES MAXIMUM IN
NSN3120-00-236-6501
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: REF4-4 · 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
KEY FEATURES
•
INNER MEMBER WIDTH: 0.4320 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN
•
THREAD DIAMETER: 0.250 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 28
•
MATERIAL: STEEL COMP E52100 INNER MEMBER
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 1,CL 2 FED SPEC SINGLE TREATMENT RESPONSE ROD END BODY
•
THREAD SERIES DESIGNATOR: UNF
•
LUBRICATION FEATURE: GROOVE INTERNAL OUTER MEMBER
•
SURFACE TREATMENT: CADMIUM ROD END BODY
TECHNICAL CHARACTERISTICS
INNER MEMBER WIDTH0.4320 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN
THREAD DIAMETER0.250 INCHES NOMINAL IN
THREAD QUANTITY PER INCH28
MATERIALSTEEL COMP E52100 INNER MEMBER
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 1,CL 2 FED SPEC SINGLE TREATMENT RESPONSE ROD END BODY
THREAD SERIES DESIGNATORUNF
LUBRICATION FEATUREGROOVE INTERNAL OUTER MEMBER
SURFACE TREATMENTCADMIUM ROD END BODY
BORE DIAMETER0.2495 INCHES MINIMUM AND 0.2515 INCHES MAXIMUM IN
INSPECTION HOLE CENTER TO END DISTANCE0.3070 INCHES MINIMUM AND 0.3170 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 1
S1106-4InterchangeableGOVERNMENT REGISTRY
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is REF4-4?
REF4-4 is a BEARING,PLAIN,ROD END.
What parts can replace REF4-4?
There is 1 known substitute for REF4-4: S1106-4. Substitute compatibility should be verified for your specific system.
What is the NSN for REF4-4?
REF4-4 is cataloged in the Federal Logistics Information System under NSN 3120-00-236-6501. This indicates validated use in U.S. government and defense supply chains.
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Last verified: October 2026