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Bolts · Shoulder Bolts

Inch Hex-Socket Shoulder Screws

4 catalogued sizes, dimensioned to ASME B18.3. Pick any row and the technical drawing redraws to it.

Inch Hex-Socket Shoulder Screws to ASME B18.3: the full dimensional table is reproduced below. 4 sizes are held in the table below, and the technical drawing redraws to whichever row you select.

Standard
ASME B18.3
Catalogued sizes
4

Dimensions are nominal values from the governing standard. Confirm the tolerance class for your application before ordering.

Inch Hex-Socket Shoulder Screws technical product image

Applications & Industries

The sectors that buy Inch Hex-Socket Shoulder Screws to ASME B18.3, and the duty each one buys them for. Stocked from 1/8 to 3/4 (screw size).

Industries that specify Inch Hex-Socket Shoulder Screws

  • Die and mold tooling Guide points where the cylindrical shoulder must be held to size.
  • Test fixtures Replaceable stops and locating posts inside compact assemblies.
  • Machine guards Recessed shoulder hardware where a socket driver clears the surrounding plate.
  • Robotic linkages Socket-head shoulder screws used as repeatable pivots.
  • Automotive & transport Chassis, driveline and body fixings that see vibration and are assembled to a controlled preload.
  • Steel fabrication Bolted connections in frames, enclosures, walkways and weldments, on the bench and on site.

Typical applications

  • placing the head in a counterbore while the shoulder carries the part
  • specifying shoulder length, diameter and mating thread independently
  • using a positive socket drive where a slot would cam out
  • providing a controlled shoulder bearing surface with a hex socket head
  • bolting brackets, motors and gearboxes to a frame
  • assemblies that are dismantled for service and re-torqued

Service conditions to specify against

Marine and coastal
Available in A4 (316) stainless for chloride exposure — coastal structures, pool halls, water treatment and deck hardware, where A2 will eventually pit.
High load
Supplied in ISO 898-1 property classes, so the joint can be designed to a stated proof load and tightened to a calculated torque rather than by feel.
Torque and preload
The joint is designed around bolt tension, so lubrication, coating and the friction coefficient all change the torque figure — state them together.

Where to use something else

  • Do not let the mating load run on the thread or socket head; the shoulder is the intended bearing feature.
  • Do not use a machine thread into unthreaded sheet or timber; use a tapping screw, rivet nut or insert made for that parent material.

Full application guide: where Inch Hex-Socket Shoulder Screws are used, how to specify them, and the cases they are wrong for

Technical Drawing

Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.

Sends the selected values to the quote form below.

Request a Quotation for Inch Hex-Socket Shoulder Screws

The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.

Request a Quotation

Specification
Business Information

Dimensions & Specifications (ASME B18.3)

Every row below is a starting point for the customizer above — pick any size and the drawing will redraw to that row.

Shoulder diameter (in)Shoulder length (in)Hex socket across-flats (in)Thread seriesMaterial optionsReference standard
1/81/8~1-1/25/64~1/4#4-40 through #10-32alloy steel / 303-316 stainless / 416 stainless / brassASME B18.3
1/41/8~1-1/25/64~1/4#4-40 through 1/4-20alloy steel / 303-316 stainless / 416 stainless / brassASME B18.3
1/21/8~1-1/25/64~1/4#4-40 through 3/8-16alloy steel / 303-316 stainless / 416 stainless / brassASME B18.3
3/41/8~1-1/25/64~1/41/4-20 through 1/2-13alloy steel / 303-316 stainless / 416 stainless / brassASME B18.3

Inch Hex-Socket Shoulder Screws conform to ASME B18.3. As bolts, they are specified by the dimensions in the table below; this page also covers materials, finishes and typical uses.

What Are Inch Hex-Socket Shoulder Screws?

Inch Hex-Socket Shoulder Screws are bolts defined by ASME B18.3. They are selected by screw size and the dimensional characteristics shown below, and are available in a range of materials and finishes to suit the application and environment.

Materials & Finishes

Common materials include carbon steel (typically zinc plated or hot-dip galvanized), alloy steel in property classes 8.8, 10.9 and 12.9, and stainless steel A2 (304) or A4 (316) for corrosion resistance. Specify the material, property class and surface finish appropriate to your load and environment.

Pricing

Inch Hex-Socket Shoulder Screws are supplied to order. Pricing starts from approximately US$0.20 per piece for standard sizes in carbon steel; final pricing depends on size, material, finish and order quantity (MOQ applies). Submit your exact configuration with the quote form above.

Inside the plant

Manufactured in our own plant

This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.

  1. Wire rod feeding into a cold heading machine
    01

    Cold heading

    Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail.

    Head dimensions and under-head radius checked at set-up and per shift.

  2. Thread rolling machine producing bolt threads
    02

    Thread rolling

    Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch.

    Go / no-go ring gauges to ISO 965 tolerance class 6g.

  3. Baskets of bolts staged for heat treatment
    03

    Heat treatment

    Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it.

    Core hardness and tensile tested per lot to ISO 898-1.

  4. Zinc plated bolts in a treatment basket
    04

    Surface treatment

    Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list.

    Coating thickness and neutral salt spray hours to ISO 9227.

Video: Inch Hex-Socket Shoulder Screws

Third-party video, selected automatically for this topic. It is not produced by Engineering Hardware and is not a specification source — use the tables on this page for dimensional data.

Frequently Asked Questions

Which standard governs Inch Hex-Socket Shoulder Screws?

Inch Hex-Socket Shoulder Screws are manufactured to ASME B18.3. The dimensional values on this page follow that standard.

Which sizes of Inch Hex-Socket Shoulder Screws does Engineering Hardware supply?

The table on this page lists 4 sizes for Inch Hex-Socket Shoulder Screws, ranging from 1/8 to 3/4. Sizes outside the table can be quoted on request.

In which materials are Inch Hex-Socket Shoulder Screws supplied?

Inch Hex-Socket Shoulder Screws are supplied in carbon steel in property classes 8.8 / 10.9 / 12.9 and stainless A2 (304) / A4 (316), with finishes including zinc plating, hot-dip galvanizing and black oxide. Choose material and finish to suit the load and the service environment for Inch Hex-Socket Shoulder Screws.

How do I request a quotation?

Use the parametric drawing on this page to set the exact configuration (size, material, finish) and click "Request this configuration" — a specialist from Engineering Hardware will respond within one business day.