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HW29172-4 — NUT,SELF-LOCKING,ASSEMBLED WASHE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

HW29172-4: NUT,SELF-LOCKING,ASSEMBLED WASHE.

NUT,SELF-LOCKING,ASSEMBLED WASHE. Key specifications include material: STEEL COMP E4340 OR STEEL COMP 4340 OR STEEL COMP 8740 NUT, nut_style: FLAT WITH TURNED UP EDGE, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), overall_height: 0.316 INCHES MINIMUM AND 0.336 INCHES MAXIMUM IN, hardness_rating: 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-159-9547, 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
HW29172-4
NSN: 5310-00-159-9547
FSC: 5310 — Nuts and Washers
CAGE: 15653 — HOWMET GLOBAL FASTENING SYSTEMS INC (USA)
SPECIFICATIONS
materialSTEEL COMP E4340 OR STEEL COMP 4340 OR STEEL COMP 8740 NUT
nut_styleFLAT WITH TURNED UP EDGE
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
overall_height0.316 INCHES MINIMUM AND 0.336 INCHES MAXIMUM IN
hardness_rating36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_across_flats0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN
nominal_thread_size0.250 INCHES IN
counterbore_diameter0.342 INCHES MINIMUM AND 0.352 INCHES MAXIMUM NUT IN
NSN5310-00-159-9547
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: HW29172-4 · 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
•
WASHER OUTSIDE DIAMETER: 0.560 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
HARDNESS RATING: 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE NUT
•
NUT COUNTERBORE DEPTH: 0.072 INCHES MINIMUM AND 0.087 INCHES MAXIMUM NUT IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.316 INCHES MINIMUM AND 0.336 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER0.560 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
HARDNESS RATING36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE NUT
NUT COUNTERBORE DEPTH0.072 INCHES MINIMUM AND 0.087 INCHES MAXIMUM NUT IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.250 INCHES IN
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES 1
TLN1030-4Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 HW29172-4?
HW29172-4 is a NUT,SELF-LOCKING,ASSEMBLED WASHE.
What parts can replace HW29172-4?
There is 1 known substitute for HW29172-4: TLN1030-4. Substitute compatibility should be verified for your specific system.
What is the NSN for HW29172-4?
HW29172-4 is cataloged in the U.S. Government catalog under NSN 5310-00-159-9547. 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.