MS35312 nickel-copper fine-thread hex cap screws.

// REFERENCE SIZES

MS35312 part-number and dimension table

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

All dimensions are in inches. Printed decimal lengths such as 0.188, 0.312, 0.438 or 0.562 are retained where listed. The length tolerance column shows separate positive and negative allowances; these are not symmetric ± limits. Head dimensions are minimum–maximum drawing limits.

// MEASUREMENT GUIDE

Measure length and head geometry

L is measured from beneath the head to the screw tip. H is axial head height and F is head width across flats. The listed F limits describe the head, not a wrench or socket acceptance range.

The reviewed minimum thread-length rule is twice nominal diameter plus 0.250 inch, with a separate positive allowance and short-screw provisions. A listed under-head length is not a fixed grip length or a claim of full threading. The governing issue controls thread length and runout.

// ORDERING DETAILS

Read the complete part number

MS35312-3 identifies a 1/4-28 screw with 0.500-inch under-head length. MS35312-109 identifies a 1/2-20 screw with 1.000-inch length. Use the complete series and dash number; matching the dash number alone does not preserve thread pitch.

Nickel-copper alloy, passivated stainless steel and plated carbon or alloy steel are different requirements. A common thread and head envelope does not establish an approved material or strength substitution.

// FAMILY COMPARISON

Compare related screw families

// DRAWING REQUIREMENTS

Match the governing drawing issue

Dimensions summarize MS35312A, sheets 1–2, 15 February 1973. These are selected historical references for purchasing identification. Later amendments or notices may apply. The issue required by your drawing controls full geometry, thread, material, finish and inspection requirements. A successor standard name does not automatically authorize a part-number change or substitution.