Quality

FROM THE MOMENT YOUR ORDER GOES INTO PRODUCTION, OUR NATIONAL TOTAL QUALITY ASSURANCE PROGRAM ENSURES YOU OF THE UTMOST QUALITY AND CONSISTENCY.

At National Bolt & Nut Corporation, we offer complete Chemical, Physical and Letters of Compliance certification upon request. Our in-house Quality Control department is an integral part of the way we provide the service you expect, and includes the following:

  • 500,000 lb. capacity tensile tester for destructive testing of up to 1.5″ diameter fasteners
  • Hardness and core testing and superficial surface hardness testing
  • Camber machine for verifying straightness
  • Complete dimensional inspection including over 230-setting plug gauges and 1100-thread ring gauges
  • Precision-calibrated gauge blocks for setting calipers and micrometers
  • Just in Time
  • Hardness and core testing and superficial surface hardness testing
  • Kanban
  • Zero Inventory
  • Stocking Programs
  • 24 Hour Emergency Turnaround
Quality Services | Fasteners Manufacturer | National Bolt & Nut Corporation

EMP LAB TESTING SERVICE

DescriptionPart No.
Manufacturer's Test ReportTest results reported by manufacturer of the product939911
Chemical & Physical Test ReportInternally Threaded Fasteners/Washers939900
Chemical & Physical Test ReportExternally Threaded Fasteners/Washers939902
Case DepthPer SAE J423934800
Chemical AnalysisAlloy Steel937923
Chemical AnalysisCarbon Steel - C, Mn, P, S, Si937924
Chemical AnalysisStainless Steel 300/400 Series937925
Contoureader TracingTracing with Autographic Printout933111
Contoureader TracingThread Tracing with Master Chart Overlay933121
Decarburization/Carburization ReportSample Sectioning, Mounting, Polishing, & Etching. Per SAE J121, J121M, J419; ASTM A574, F835, F835M934901
Examination for Laps on ThreadSection, Mount & Polish934904
Hardness Core (Rockwell: HRC, HRB, 15N, 30N)Nuts/Bolts 1/4" through 1"937111
Hardness Core (Rockwell: HRC, HRB, 15N, 30N)Nuts/Bolts 1 1/8" through 2"937112
Hardness Core (Rockwell: HRC, HRB, 15N, 30N)Non-Fastener937113
Hardness Surface (Rockwell: HRC, HRB, 15N, 30N)Nuts/Bolts 1/4" through 1"937121
Hardness Surface (Rockwell: HRC, HRB, 15N, 30N)Nuts/Bolts 1 1/8" through 2"937122
Hardness Surface (Rockwell: HRC, HRB, 15N, 30N)Non-Fastener937123
Magnetic Particle TestBolts per SAE J1061934111
Magnetic Particle TestBolts per SAE J123934131
Magnetic Particle TestBolts per ASTM F788934132
Magnetic Particle TestNuts per SAE J122A934263
Magnetic Particle TestNuts per ASTM F812934264
Plating Thickness MeasurementThickness Measured from 0 to 2 Mil (Zn Fe & Cd Fe)936111
Proof Load Test - 400,000 lb. max capacity (Externally Threaded)Bolts 1/4" through 3/4"932213
Proof Load Test - 400,000 lb. max capacity (Externally Threaded)Bolts 7/8" through 1 1/4"932223
Proof Load Test - 400,000 lb. max capacity (Externally Threaded)Bolts 1 3/8" through 2"932233
Proof Load Test - 400,000 lb. max capacity (Externally Threaded)Nuts 1/4" through 3/4"932211
Proof Load Test - 400,000 lb. max capacity (Externally Threaded)Nuts 7/8" through 1 1/4"932221
Proof Load Test - 400,000 lb. max capacity (Externally Threaded)Nuts 1 3/8" through 2"932231
Salt Spray TestPer ASTM B117935120
Surface Discontinuity MeasureDepth & Width (Crack or Seam)934903
Surface Roughness TestPer ASTM B46.1935700
Tensile Test - 400,000 lb. max capacity (Wedge, Axial)Bolts 1/4" through 3/4"932011
Tensile Test - 400,000 lb. max capacity (Wedge, Axial)Bolts 7/8" through 1 1/4"932021
Tensile Test - 400,000 lb. max capacity (Wedge, Axial)Bolts 1 3/8" through 2"932031
Tensile Test - Machined SpecimenJ429 / F606 / A370932411