Nut, Plain, Knurled5310-01-556-0549

NSN 5310-01-556-0549 · NIIN 015560549 · Part number HM020-267-3

Robertson Fuel Systems, L.l.c. · FSC 5310 — Nuts and Washers · FSG 53 — Hardware and Abrasives · CAGE 1T765

Government record, cited

NSN 5310-01-556-0549 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-556-0549. Manufacturer of record part number: HM020-267-3.

Also searched as 5310-01-556-0549 · 5310015560549 · NIIN 015560549 · 01-556-0549 · FSC 5310 Nuts and Washers · CAGE 1T765 · HM020-267-3

Nearby stock numbers ← 5310-01-556-0374 Washer, Lock · 5310-01-556-0659 Washer, Flat →

5310-01-556-0549 — Nuts and Washers

Features

Nut,plain,knurled — FSC 5310
1 manufacturer part number on file
Manufacturer of record: Robertson Fuel Systems, L.l.c.

Identification

NSN: 5310-01-556-0549
NIIN: 015560549
FSC: 5310 — Nuts and Washers
FSG: 53 — Hardware and Abrasives
Primary part number: HM020-267-3
Manufacturer: Robertson Fuel Systems, L.l.c.

General Description

The Nut,plain,knurled, cataloged under National Stock Number 5310-01-556-0549, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Robertson Fuel Systems, L.l.c.. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	5310-01-556-0549
Primary Part Number	HM020-267-3
Item Name	Nut,plain,knurled
FSC / FSG	5310 / 53 — Nuts and Washers
Manufacturer	Robertson Fuel Systems, L.l.c.
Status	ACTIVE

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	No hazard code in the DLA record (HMIC N)
Criticality Code	X

Cross-Reference Index

Part Number	Manufacturer
HM020-267-3 PRIMARY	Robertson Fuel Systems, L.l.c. (USA)

No interchangeability data on file.

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

5310-00-000-0040 · Item name not on file

5310-00-000-0077

NUT,PLAIN,ROUND

5310-00-000-0079

WASHER,FLAT

5310-00-000-0079

WASHER,FLAT

5310-00-000-1146

5310-00-000-1146 · Item name not on file

5310-00-000-3815

5310-00-000-3815 · Item name not on file

5310-00-000-4532

5310-00-000-4532 · Item name not on file

5310-00-000-4540

5310-00-000-4540 · Item name not on file

Frequently Asked Questions

What is NSN 5310-01-556-0549?

NSN 5310-01-556-0549 is a Nut,plain,knurled, manufactured by Robertson Fuel Systems, L.l.c., classified under FSC 5310, Nuts and Washers. Status: active.

What part numbers are listed for NSN 5310-01-556-0549?

NSN 5310-01-556-0549 has 1 manufacturer part number on file: HM020-267-3 (Robertson Fuel Systems, L.l.c.).

What are the specifications of HM020-267-3?

Key specifications for HM020-267-3: Special Features: 2.30 IN. DIA X 0.62 IN. WIDE WITH 1.70 IN. INSIDE DIA; DIAMOND PATTERN KNURL; USED ON INTERNAL AUXILIARY FUEL TRANSFER SYSTEM (IAFTS) IN; Part Name Assigned by Controlling Agency: NUT,ADAPTER,RETAINING; End Item Identification: UH-60 BLACKHAWK HELICOPTER, 1520-01-035-0266 AND 1520-01-298-4532. 0 specifications are documented in the U.S. Government catalog.

Is NSN 5310-01-556-0549 hazardous material?

No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.

✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.

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