MS51965 flat-point set screws.

// REFERENCE SIZES

MS51965 part-number and dimension table

Reference selections for purchasing identification and quotation. Webson confirms availability by inquiry; these rows do not indicate stocked inventory. Configuration shown: plain.

All dimensions are in inches. Length preserves printed decimal values such as 0.188 and 0.312; the adjacent ± value is the drawing’s length tolerance. Point values are minimum–maximum limits. J is the drawing’s nominal socket width across flats, not a measured acceptance range.

// MEASUREMENT GUIDE

Measure length and point geometry

L is overall screw length from the socket end to the flat point. C is the flat point diameter; J is nominal socket width across flats. The point and socket dimensions describe different ends of the screw.

The flat contact end differs from a recessed cup point and a projecting half-dog point. Confirm the required contact geometry before comparing replacement sizes.

// ORDERING DETAILS

Read the dash number and locking requirement

MS51965-55 identifies a plain 1/4-20 flat-point screw with a 0.500-inch length. MS51965-79 identifies a plain 3/8-16 screw with the same length. The selected table contains all 52 plain entries in the reviewed Table I; separate self-locking dash numbers are outside this selection.

The reviewed alloy-steel requirement specifies Rockwell C45–53 and cadmium plating. A shared thread or length does not make the cup-point MS51963 or stainless fine-thread MS51031 an approved alternate.

// FAMILY COMPARISON

Compare related set-screw families

Compare the point, thread, material, finish and locking configuration together. These family comparisons do not establish an approved substitution.

// DRAWING REQUIREMENTS

Match the governing drawing issue

Dimensions summarize MS51965B, sheet 1, 29 December 1972. These are selected historical references for purchasing identification. The issue required by your drawing controls full geometry, thread requirements, material, finish, locking provisions and inspection. No automatic successor or part-number substitution is implied.