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Packaged Items
SinglePack of 10
ThreadLengthGripNAS PNPart Number


Phillips Pan Head
Alloy Steel per
Finish - Cadmium per
QQ-P-416 Type II
Tensile - 160,000 -
180,000 PSI
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Good quality look and feel. When ordering, unless you are certain of the length, one might consider order one or two sizes longer and shorter than what is probably needed. There is so little thread length relative to shank that length can matter particularly when screwing into nutserts.

Bruce B
March 31, 2020


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: What is the grip length on the NAS 623 screws part numbers: 2-9 and 2-10?

The grip length for NAS623-2-9 is .562". The grip length for NAS623-2-10 is .625". We have added the grip length as a column to the chart on the web page for the rest of the screws.

Q: Which nut will fit 04-00573 and 04-00577?

These are 8-32 threaded screws, so any 8-32 threaded nut will work on these screws. There any many styles to choose from.

Q: What is the plain shank diameter for an 8-32 NAS623 screw?

This will range between .1610"-.1635" per the tech data sheet.

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