PartsTable
Technical Data Sheet
HR20556 ✓ Verified by PartsTable
· NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The NUT,PLAIN,ROUND is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1005 OVERALL, nut_style: ROUND, nut_diameter: 3.625 INCHES NOMINAL IN, nut_thickness: 0.5625 INCHES NOMINAL IN, thread_series: UNS, hardness_rating: 66.0 ROCKWELL B MINIMUM AND 92.0 ROCKWELL B MAXIMUM. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-185-6343, 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
HR20556
NSN: 5310-00-185-6343
FSC: 5310
CAGE: 51228 — ECOLAIRE INC BALDWIN-HAMILTON CO DIV (USA)
SPECIFICATIONS
materialSTEEL COMP 1005 OVERALL
nut_styleROUND
nut_diameter3.625 INCHES NOMINAL IN
nut_thickness0.5625 INCHES NOMINAL IN
thread_seriesUNS
hardness_rating66.0 ROCKWELL B MINIMUM AND 92.0 ROCKWELL B MAXIMUM
thread_directionRIGHT-HAND
drive_point_depth0.125 INCHES NOMINAL IN
drive_point_width0.250 INCHES NOMINAL IN
nominal_thread_size2.751 INCHES IN
drive_point_quantity4
thread_pitch_diameters+2.7149 TO 2.7200 INCHES IN
NSN5310-00-185-6343
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: HR20556 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
THREAD DIRECTION: RIGHT-HAND
NUT STYLE: ROUND
HARDNESS RATING: 66.0 ROCKWELL B MINIMUM AND 92.0 ROCKWELL B MAXIMUM
THREAD SERIES: UNS
THREAD QUANTITY PER INCH: 18
NOMINAL THREAD SIZE: 2.751 INCHES IN
MATERIAL: STEEL COMP 1005 OVERALL
NUT DIAMETER: 3.625 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
NUT STYLEROUND
HARDNESS RATING66.0 ROCKWELL B MINIMUM AND 92.0 ROCKWELL B MAXIMUM
THREAD SERIESUNS
THREAD QUANTITY PER INCH18
NOMINAL THREAD SIZE2.751 INCHES IN
MATERIALSTEEL COMP 1005 OVERALL
NUT DIAMETER3.625 INCHES NOMINAL IN
THREAD PITCH DIAMETERS+2.7149 TO 2.7200 INCHES IN
DRIVE POINT DEPTH0.125 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
7C7-130VInterchangeable
interchangeable cross-reference
interchangeable
7C7/WInterchangeable
interchangeable cross-reference
interchangeable
K849546-2Interchangeable
interchangeable cross-reference
interchangeable
118-15Interchangeable
interchangeable cross-reference
interchangeable
3038-9012PC4Interchangeable
interchangeable cross-reference
interchangeable
4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is HR20556?
HR20556 is a NUT,PLAIN,ROUND.
What parts can replace HR20556?
There are 25 known substitutes for HR20556: 7C7-130V, 7C7/W, K849546-2 and 22 more. Substitute compatibility should be verified for your specific system.
Is HR20556 still available?
HR20556 is currently cancelled.
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