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.
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Item #

Description

Thread Size

Stamping

Codes and Standards

N/A Machine Screw Nut, 2-56 N/A 2-56 N/A -224 N/A MS 35649
N/A Machine Screw Nut, 4-40 N/A 4-40 N/A -244 N/A MS 35649
N/A Machine Screw Nut, 6-32 N/A 6-32 N/A -264 N/A MS 35649
N/A Machine Screw Nut, 8-32 N/A 8-32 N/A -284 N/A MS 35649
N/A Machine Screw Nut, 10-24 N/A 10-24 N/A -204 N/A MS 35649
N/A Machine Screw Nut, 1/4-20 N/A 1/4-20 N/A -2254 N/A MS 35649
N/A Machine Screw Nut, 5/16-18 N/A 5/16-18 N/A -2314 N/A MS 35649
N/A Machine Screw Nut, 3/8-16 N/A 3/8-16 N/A -2384 N/A MS 35649
N/A Machine Screw Nut, 10-32 N/A 10-32 N/A -304 N/A MS 35650
N/A Finished Nut, 1/4-20 N/A 1/4-20 N/A -1 N/A MS 51971
N/A Finished Nut, 5/16-18 N/A 5/16-18 N/A -2 N/A MS 51971
N/A Finished Nut, 3/8-16 N/A 3/8-16 N/A -3 N/A MS 51971
N/A Finished Nut, 1/2-13 N/A 1/2-13 N/A -5 N/A MS 51971
N/A Finished Nut, 5/8-11 N/A 5/8-11 N/A -7 N/A MS 51971
N/A Finished Nut, 3/4-10 N/A 3/4-10 N/A -8 N/A MS 51971
N/A Finished Nut, 1/4-28 N/A 1/4-28 N/A -1 N/A MS 51972
N/A Finished Nut, 5/16-24 N/A 5/16-24 N/A -2 N/A MS 51972
N/A Finished Nut, 3/8-24 N/A 3/8-24 N/A -3 N/A MS 51972
N/A Finished Nut, 1/2-20 N/A 1/2-20 N/A -5 N/A MS 51972
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