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Sales Systems Limited Products and Services > Fasteners > Nuts > Machine Screw Nuts > Machine Screw Nuts > Item # item-6256  
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Item # item-6256, Finished Nut, 5/8-11

Made in U.S.A.

Machine screws nuts manufactured domestically by Amerifast Corp. and MRL Mfg.

All nuts are made of 304 Stainless and are stamped with Robbins "R" trademark and "304AN"; AN stands for annealed. Chemicals and physicals showing conformance to MS specifications are available on all items.
  • Material to procurement spec FF-N-836; Fed Std 66; QQ-S-763.
  • Passivated to QQ-P-35.
  • Dimensions, proof load, hardness, threads to MS specs, procurement spec FF-N-836; Fed Std H28/2; Fed Std H28/20 system 21; ANSI B18.2.2.
  • Magnetic permeability to procurement spec FF-N-836.
  • Quality assurance to procurement spec FF-N-836; Mil Std 105.

Manufacturer  · Specifications  · Codes and Standards



Robbins Manufacturing Co., Inc.



Finished Nut

Thread Size





304 Stainless Steel

Codes and Standards

Codes and Standards

MS 51971

Distributor of Industry Standard and Military Specification Threaded Fasteners