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Bolts · Shoulder Bolts

Inch Slotted Shoulder Screws

4 catalogued sizes, dimensioned to Trade series (inch shoulder screws). Pick any row and the technical drawing redraws to it.

Inch Slotted Shoulder Screws to Trade series (inch shoulder screws): 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
Trade series (inch shoulder screws)
Catalogued sizes
4

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

Inch Slotted Shoulder Screws technical product image

Applications & Industries

Inch Slotted Shoulder Screws are bought for a small number of well-defined jobs. These are the ones we ship them for. Stocked from 1/8 to 1/2 (screw size).

Industries that specify Inch Slotted Shoulder Screws

  • Light machinery Wear-resistant pivot hardware assembled with a simple slot driver.
  • Linkage mechanisms Slotted-head shoulder screws used as pivots and bearing shoulders.
  • Tooling fixtures Replaceable guide and stop points in jigs.
  • Camera and instrument mounts Controlled shoulder length where axial position matters.
  • Energy & infrastructure Tower, pipework, switchgear and plant fixings specified for long service life and inspectable joints.
  • Maintenance & MRO Stocked replacements matched to an existing property class, thread and finish.

Typical applications

  • keeping the mating part on the shoulder instead of the threaded section
  • locating a rotating or sliding part on a defined cylindrical shoulder
  • selecting shoulder diameter and length separately from the thread
  • using the slot for low-profile manual assembly
  • joints where the property class is stated on the drawing
  • clamping two machined faces to a calculated preload

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 use the slot as a high-torque structural drive; it is a compact head feature for the shoulder assembly.
  • 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 Slotted 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 Slotted 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 (Trade series (inch shoulder screws))

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)Thread optionsShoulder length (in)Slot width (in)Slot depth (in)Material optionsThread class
1/8#4-40 / #6-321/8~1-1/20.047~0.0940.062~0.109303 or 416 stainless / alloy steel / brass2A
1/4#8-32 / #10-24 / #10-321/8~1-1/20.047~0.0940.062~0.109303 or 416 stainless / alloy steel / brass2A
3/81/4-20 / 5/16-181/8~1-1/20.047~0.0940.062~0.109303 or 416 stainless / alloy steel / brass2A
1/23/8-161/8~1-1/20.047~0.0940.062~0.109303 or 416 stainless / alloy steel / brass2A

Manufactured to Trade series (inch shoulder screws), Inch Slotted Shoulder Screws are bolts supplied by Engineering Hardware. The dimensional data, materials and selection notes are summarized here.

What Are Inch Slotted Shoulder Screws?

Inch Slotted Shoulder Screws are bolts defined by Trade series (inch shoulder screws). 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 Slotted Shoulder Screws are supplied to order. Pricing starts from approximately US$0.18 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.

Frequently Asked Questions

What standard are Inch Slotted Shoulder Screws manufactured to?

Inch Slotted Shoulder Screws are manufactured to Trade series (inch shoulder screws). The dimensional values on this page follow that standard.

What sizes are available for Inch Slotted Shoulder Screws?

The table on this page lists 4 sizes for Inch Slotted Shoulder Screws, ranging from 1/8 to 1/2. Sizes outside the table can be quoted on request.

In which materials are Inch Slotted Shoulder Screws supplied?

Inch Slotted 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 Slotted 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.