5310-00-477-0249 WASHER,FLAT Index 5305-00-477-0251 SCREW,EXTERNALLY RELIEVED BODY

National Stock Number:
5305-00-477-0250

Federal Supply Class:
5305

National Item Identification Number:
004770250

Description:
THUMBSCREW

Detail:
An externally threaded fastener whose threaded portion is of one nominal diameter. It may have an unthreaded portion with a diameter less than, equal to, or greater than the diameter of the threaded portion. It has either a vertically flattened, circular knurled, or wing type head, all of which are designed for rotation by the thumb and fingers. For items having wrenching facilities such as socket recess, multiple spline or slot heads, use SCREW (as modified) or BOLT (as modified).


Manufacturer Information:
703061-296214RAYTHEON COMPANY


Techincal Specification:
FASTENER LENGTH2.190 INCHES MINIMUM AND 2.210 INCHES MAXIMUM
HEAD DIAMETER0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM
HEAD HEIGHT0.390 INCHES MINIMUM AND 0.410 INCHES MAXIMUM
HEAD STYLEKNURLED NO. 1KNURLED NO. 1
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-7720 MIL SPEC ALL MATERIAL RESPONSES OVERALL
MATERIALSTEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 316 OVERALL
NOMINAL THREAD DIAMETER0.138 INCHES
POINT STYLEFLATFLAT
SHOULDER DIAMETER0.164 INCHES MINIMUM AND 0.165 INCHES MAXIMUM FIRST SHOULDER
SHOULDER SHAPEROUND FIRST SHOULDER
SHOULDER LENGTH1.990 INCHES MINIMUM AND 2.010 INCHES MAXIMUM FIRST SHOULDER
THREAD LENGTH0.190 INCHES MINIMUM AND 0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM0.210 INCHES MAXIMUM
THREAD CLASS2A
THREAD DIRECTIONRIGHT-HAND
THREAD QUANTITY PER INCH32
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)


Click here to Register for Free 30-day Trial

© 2026 NSN-Now. All rights reserved.    Privacy Policy  |  Contact Us