PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

B12-8Washer,flat

Roller Bearing Co of America, Inc Div Pic Design · NSN 5310-01-256-9257 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-01-256-9257 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-256-9257. Primary manufacturer part number: B12-8.
Features
  • Washer,flat — FSC 5310
  • Hole Diameter: 0.375 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
  • Peripheral Shape Style: ROUND
  • Surface Treatment: ANODIZE OVERALL
  • Thickness: 0.061 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN
  • Center Hole Shape Style: ROUND
  • Overall Diameter: 0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN
  • Cross-Sectional Shape Style: RECTANGULAR
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Comp 301 or Steel Comp 302 or Steel Comp 302b or Steel Comp 303 or Steel Comp 303SE or Steel Comp 304 or Steel Comp 304l or Steel Comp 305 or Steel Comp 308 or Steel Comp 309 or Steel Comp 309s or Steel Comp 310 or Steel Comp 310s or Steel Comp 314 or Steel Comp 316 or Steel Comp 316l or Steel Comp 317 or Steel Comp 321 or Steel Comp 347 or Steel Comp 348 or Steel Comp 384 or Steel Comp 385 Overall construction
General Description

The Washer,flat, cataloged under National Stock Number 5310-01-256-9257, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Roller Bearing Co of America, Inc Div Pic Design. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5310-01-256-9257
Primary Part NumberB12-8
Item NameWasher,flat
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerRoller Bearing Co of America, Inc Div Pic Design
StatusCANCELLED
Hole Diameter0.375 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN
Peripheral Shape StyleROUND
Surface TreatmentANODIZE OVERALL
Thickness0.061 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN
Center Hole Shape StyleROUND
Overall Diameter0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN
Cross-Sectional Shape StyleRECTANGULAR
MaterialSTEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 302B OR STEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 304 OR STEEL COMP 304L OR STEEL COMP 305 OR STEEL COMP 308 OR STEEL COMP 309 OR STEEL COMP 309S OR STEEL COMP 310 OR STEEL COMP 310S OR STEEL COMP 314 OR STEEL COMP 316 OR STEEL COMP 316L OR STEEL COMP 317 OR STEEL COMP 321 OR STEEL COMP 347 OR STEEL COMP 348 OR STEEL COMP 384 OR STEEL COMP 385 OVERALL
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 9
3110-00-004-334342420-251 INTERCHANGEABLE
Bearing,roller,needle
Jtekt Bearings North America Llc Div Kbna - Ord 1
5925-00-047-3859B12-8 INTERCHANGEABLE
Thermal Release,circuit Breaker
Schneider Electric Usa, Inc. Dba Schneider Electric
3110-00-120-3086B-128 INTERCHANGEABLE
Bearing,roller,needle
Jtekt Bearings North America Llc Div Kbna - Ord 1
3030-00-529-0295 INTERCHANGEABLE
Belt,v
3030-00-640-4355 INTERCHANGEABLE
Belts,v,matched Set
3110-00-690-184447-140-238 INTERCHANGEABLE
Bearing,roller,needle
Timken Aerospace, Inc Dba Torrington Product
2940-01-239-611811-5703 INTERCHANGEABLE
Filter Element,fluid
Thermo King Corporation Dba Phoenix Global Distirbution.
4330-01-353-8067B128 INTERCHANGEABLE
Pneumatic Muffler,exhaust-Intake
Allied Witan Co Dba Alwitco
3110-01-494-9112 INTERCHANGEABLE
Bearing,roller,needle
Cross-Reference Index
Part NumberManufacturer
B12-8 PRIMARY Roller Bearing Co of America, Inc Div Pic Design (USA)
Related Parts
3110-00-004-3343INTERCHANGEABLE
BEARING,ROLLER,NEEDLE
42420-251
5925-00-047-3859INTERCHANGEABLE
THERMAL RELEASE,CIRCUIT BREAKER
B12-8
3110-00-120-3086INTERCHANGEABLE
BEARING,ROLLER,NEEDLE
B-128
3030-00-529-0295INTERCHANGEABLE
BELT,V
3030-00-640-4355INTERCHANGEABLE
BELTS,V,MATCHED SET
3110-00-690-1844INTERCHANGEABLE
BEARING,ROLLER,NEEDLE
47-140-238
2940-01-239-6118INTERCHANGEABLE
FILTER ELEMENT,FLUID
11-5703
4330-01-353-8067INTERCHANGEABLE
PNEUMATIC MUFFLER,EXHAUST-INTAKE
B128
3110-01-494-9112INTERCHANGEABLE
BEARING,ROLLER,NEEDLE

Frequently Asked Questions

What is NSN 5310-01-256-9257?

NSN 5310-01-256-9257 is a Washer,flat, manufactured by Roller Bearing Co of America, Inc Div Pic Design, classified under FSC 5310 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5310-01-256-9257?

NSN 5310-01-256-9257 has 1 cross-referenced part number: B12-8 (Roller Bearing Co of America, Inc Div Pic Design).

What NSN replaces 5310-01-256-9257?

There are 9 known substitutes for 5310-01-256-9257: 3110-00-004-3343, 5925-00-047-3859, 3110-00-120-3086 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of B12-8?

Key specifications for B12-8: Hole Diameter: 0.375 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN; Peripheral Shape Style: ROUND; Surface Treatment: ANODIZE OVERALL; Thickness: 0.061 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN. 8 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5310-01-256-9257 still in active supply?

NSN 5310-01-256-9257 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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