PartsTable
Technical Data Sheet
21056 ✓ Verified by PartsTable
Lindy · 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

3 socket Surge Guard to protect devices from damage caused by power spikes<br><br>- 3 surge protected power sockets to connect and power devices safely, comes with a cable length of 1.8m<br>- Convenient main power switch to turn off all connected devices at once<br>- Sockets with child safety shutters to prevent children from accessing the socket contacts<br>- Protects sensitive equipment against damage from power surges and spikes<br>- 45 degree angled power sockets for easy access<br>- Illuminated switch that indicates ON- or OFF mode<br>- Fixing holes for easy wall mounting<br>- Up to 15.000 Euro warranty on connected equipment (see warranty conditions on trust.com) This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-274-7731, indicating validated use in U.S. government and defense logistics supply chains.

WHERE IT FITS
21056
NSN: 5310-00-274-7731
FSC: 5310
CAGE: 12156 — 0MCC INC (USA)
SPECIFICATIONS
materialSTEEL COMP 3140 OR STEEL COMP 2330 OR STEEL COMP 4135 OR STEEL COMP 4140 OR STEEL COMP 4037 OVERALL
nut_styleCASTELLATED, HEXAGON
body_width0.245 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN
nut_height0.448 INCHES MINIMUM AND 0.458 INCHES MAXIMUM IN
body_height0.180 INCHES MAXIMUM IN
body_length0.755 INCHES MINIMUM AND 0.785 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNF
memory_capacityUNKNOWN
special_featuresPRINTED WIRING BOARD 1,CAPACITOR 6,DIODE 48
thread_directionRIGHT-HAND
features_providedHERMETICALLY SEALED AND BURN IN AND HIGH PERFORMANCE AND MONOLITHIC AND W/ENABLE AND SCHOTTKY AND W/STORAGE
NSN5310-00-274-7731
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 21056 · Lindy ⚠ 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
NUT STYLE: CASTELLATED, HEXAGON
WIDTH ACROSS FLATS: 0.612 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH: 20
THREAD CLASS: 3B
THREAD DIRECTION: RIGHT-HAND
NUT HEIGHT: 0.448 INCHES MINIMUM AND 0.458 INCHES MAXIMUM IN
BEARING SURFACE TYPE: WASHER FACED
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD 1ST MATERIAL RESPONSE OR SAE ASSN STD 2ND MATERIAL RESPONSE OR SAE ASSN STD 3RD MATERIAL RESPONSE OR SAE ASSN STD 4TH MATERIAL RESPONSE OR AISI ASSN STD 5TH MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
NUT STYLECASTELLATED, HEXAGON
WIDTH ACROSS FLATS0.612 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH20
THREAD CLASS3B
THREAD DIRECTIONRIGHT-HAND
NUT HEIGHT0.448 INCHES MINIMUM AND 0.458 INCHES MAXIMUM IN
BEARING SURFACE TYPEWASHER FACED
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD 1ST MATERIAL RESPONSE OR SAE ASSN STD 2ND MATERIAL RESPONSE OR SAE ASSN STD 3RD MATERIAL RESPONSE OR SAE ASSN STD 4TH MATERIAL RESPONSE OR AISI ASSN STD 5TH MATERIAL RESPONSE OVERALL
MATERIALSTEEL COMP 3140 OR STEEL COMP 2330 OR STEEL COMP 4135 OR STEEL COMP 4140 OR STEEL COMP 4037 OVERALL
NOMINAL THREAD SIZE0.438 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
21056Interchangeable
interchangeable cross-reference
interchangeable
57020Interchangeable
PCI-X Ultra320 Dual Channel Adapter
interchangeable
8933179-1Interchangeable
interchangeable cross-reference
interchangeable
B94.2-1971 TABLE 5Interchangeable
interchangeable cross-reference
interchangeable
20710Interchangeable
interchangeable cross-reference
interchangeable
506.3125Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21056?
21056 is a MICROCIRCUIT,DIGITAL manufactured by Lindy.
What parts can replace 21056?
There are 22 known substitutes for 21056: 21056, 57020, 8933179-1 and 19 more. Substitute compatibility should be verified for your specific system.
Is 21056 still available?
21056 is currently cancelled.
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