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style no. 2 sect a, rdg 170, straight type, cres, spec data, fed, QQ-S-763, class 303, condition a, not rated for hardness, passivated finish, tooth data, double thd, 20 deg pressure angle, 0.1309 in. thd lead, rh thd, 7 deg 7 min helix angle, dim data, sect a, rdg 170, 0.3749 in. od of gear, 0.3323 in. min, 0.3333 in. max pitch dia, 0.563 in. w of face, 0.750 in. lg o/a, 0.3125 in. od of end of hub, 0.188 in. dim. from end of hub to face, hub not stepped or grooved, bore data, w/o bearing, straight bore, 0.1873 in. min, 0.1878 in. max dia, 0.750 in. lg through bore, counter bored, bb end sect a, rdg 170, 0.219 in. dia counterbore, 0.188 in. deep counterbore, w/method of securing aa end sect a, rdg 170, w/thd hole, 1 hole, no. 4/0.112 in./-40 thd size, located on hub portion of gear between hub end and face, w/o unthd holes, part no. 409751-1
Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.
Precious metal content is unknown
The item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application.
HMIC: Hazardous Material Indicator Code. A one position code that identifies a hazardous item.
PMIC: Precious Metal Indicator Code. A one position code which identifies items that have precious metals as part of their content. precious metals are those metals generally considered to be uncommon, highly valuable, and relatively superior in certain properties such as resistance to corrosion and electrical conductivity.
ESD: Electrostatic Discharge. Indicates if an item is susceptible to electrostatic discharge or electromagnetic interference damage. electrostatic discharge damage occurs when an accumulation of static electricity generated by the relative motion or separation of materials is released to another item by direct contact. electromagnetic interference damage occurs when an item comes into proximity with an electrostatic or magnetic field.
ENAC: Enviromental Attribute Code. Identifies items with environmentally preferred characteristics.
CRITL: Criticality Indicator Code. Indicates an item is technically critical by tolerance, fit, application, nuclear hardness properties, or other characteristics.
Defense logistics agency, enterprise business systems
SOS: Source of Supply. A three position code or routing identifier code (ric), which identifies the source of supply activity.
SMIC: Special Material Indicator Code. A two position code, which categorizes material on the basis of requirements for source or quality control, technical design or configuration control, procurement, stocking and issue control, special receipt, inspection, testing, storage, or handling.
MMAC: Material Management Aggregation Code. A two position code that identifies an item of supply to be managed by a specific activity manager.
MCC: Material Echelon Code. A two position code employed by the marine corps in classifying items into categories by materiel category and procurement echelon. the alphanumeric management code is in the first position and identifies the materiel category
IMC: Denotes wether items shall be subjected to integrated management under the defense supply agency or retained by the individual military service or other department of defense components for their management. Assigned by th activity responsible for item management coding.