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2W19 — THUMBSCREW

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

2W19: THUMBSCREW.

The THUMBSCREW is a the manufacturer industrial component. Key specifications include hole_diameter: 3.800 INCHES MINIMUM AND 3.830 INCHES MAXIMUM IN, hardness_rating: 50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM, outside_diameter: 4.562 INCHES MINIMUM AND 4.607 INCHES MAXIMUM IN, style_designator: KEY, material_thickness: 0.088 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN, external_key_quantity: 19. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-186-0978, 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
2W19
NSN: 5310-00-186-0978
NIINs: 001860978, 011539157
FSC: 5310 — Nuts and Washers
CAGE: 50816 — SYKES DATATRONICS INC (USA)
SPECIFICATIONS
materialSTEEL COMP 1010 OR STEEL COMP 1012 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OVERALL
hole_diameter3.800 INCHES MINIMUM AND 3.830 INCHES MAXIMUM IN
hardness_rating50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM
outside_diameter4.562 INCHES MINIMUM AND 4.607 INCHES MAXIMUM IN
style_designatorKEY
material_thickness0.088 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN
external_key_quantity19
external_prebent_key_width0.298 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
internal_prebent_key_width0.313 INCHES MINIMUM AND 0.353 INCHES MAXIMUM IN
internal_prebent_key_length0.188 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
overall_distance_including_keys5.219 INCHES MAXIMUM IN
material_document_and_classificationSAE ASSN STD ALL MATERIAL RESPONSES OVERALL
NSN5310-00-186-0978
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 2W19 · 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
•
INTERNAL PREBENT KEY WIDTH: 0.313 INCHES MINIMUM AND 0.353 INCHES MAXIMUM IN
•
OVERALL DISTANCE INCLUDING KEYS: 5.219 INCHES MAXIMUM IN
•
HARDNESS RATING: 50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM
•
STYLE DESIGNATOR: KEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD ALL MATERIAL RESPONSES OVERALL
•
OUTSIDE DIAMETER: 4.562 INCHES MINIMUM AND 4.607 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.088 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN
•
EXTERNAL KEY QUANTITY: 19
TECHNICAL CHARACTERISTICS
INTERNAL PREBENT KEY WIDTH0.313 INCHES MINIMUM AND 0.353 INCHES MAXIMUM IN
OVERALL DISTANCE INCLUDING KEYS5.219 INCHES MAXIMUM IN
HARDNESS RATING50.0 ROCKWELL B MINIMUM AND 81.0 ROCKWELL B MAXIMUM
STYLE DESIGNATORKEY
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD ALL MATERIAL RESPONSES OVERALL
OUTSIDE DIAMETER4.562 INCHES MINIMUM AND 4.607 INCHES MAXIMUM IN
MATERIAL THICKNESS0.088 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN
EXTERNAL KEY QUANTITY19
INTERNAL PREBENT KEY LENGTH0.188 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
EXTERNAL PREBENT KEY WIDTH0.298 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 9
MAL611ISSUE2PC544Reference document
Same NSN cross-reference
Reference document — Secondary reference
155470DPC84Reference document
Same NSN cross-reference
Reference document — Secondary reference
AS11-1701-543PC33Reference document
Same NSN cross-reference
Reference document — Secondary reference
417-612-39PC544Reference document
Same NSN cross-reference
Reference document — Secondary reference
W19Reference document
Same NSN cross-reference
Reference document — Secondary reference
800976PC555Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2W19?
2W19 is a THUMBSCREW.
What parts can replace 2W19?
There are 9 known substitutes for 2W19: MAL611ISSUE2PC544, 155470DPC84, AS11-1701-543PC33 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 2W19?
2W19 is cataloged in the U.S. Government catalog under NSN 5310-00-186-0978. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.