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Seals · Trade series (self-centring bonded washers, USIT type)

M8 USIT Rings (Self-Centring Bonded Seals) Dimensions

Controlling dimensions to Trade series (self-centring bonded washers, USIT type), with tolerances and fit.

M8 USIT Rings (Self-Centring Bonded Seals) dimensions to Trade series (self-centring bonded washers, USIT type): coarse thread pitch 1.25 mm.

Coarse thread pitch
1.25 mm

Figures are nominal values from the governing standard. Confirm against the tolerance class for your application before machining or ordering.

M8 USIT Rings (Self-Centring Bonded Seals) Dimensions reference image

The M8 size of USIT Rings (Self-Centring Bonded Seals) is dimensioned by Trade series (self-centring bonded washers, USIT type). The table below gives the dimensional row from the standard, followed by the installation notes for this type.

Values are taken from the governing standard rather than from a general machine-thread table, because this type is not selected on one.

M8 Dimensional Row (Trade series (self-centring bonded washers, USIT type))

ThreadSeal elementMetal carrierTypical service
M8NBR inner lipzinc-plated steelhydraulic ports and plugs

Custom manufacturing · Made to drawing

Need USIT rings (self-centring bonded seals) in a size this table does not list?

This page covers M8 USIT rings (self-centring bonded seals). Inside diameter, cross-section and compound are the three that matter, and the compound is chosen against the fluid and the temperature rather than the dimensions.

Minimum order from 2,000 pieces; samples within 7 days of drawing approval.

Custom seal manufacturingSend a drawing

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.

Dimensioned line drawing of M8 USIT Rings (Self-Centring Bonded Seals) to Trade series (self-centring bonded washers, USIT type). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.
Seal element
NBR inner lip
Metal carrier
zinc-plated steel
Typical service
hydraulic ports and plugs
Sends the selected values to the quote form below.

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

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Specification
Business Information

Dimensions & Specifications (Trade series (self-centring bonded washers, USIT type))

ThreadSeal elementMetal carrierTypical service
M6NBR inner lipzinc-plated steelhydraulic ports and plugs
M8NBR inner lipzinc-plated steelhydraulic ports and plugs
M10NBR inner lipzinc-plated steelhydraulic ports and plugs
M12NBR inner lipzinc-plated steelhydraulic ports and plugs
M14NBR or FKM inner lipzinc-plated or stainlesshydraulic and fuel
M16NBR or FKM inner lipzinc-plated or stainlesshydraulic and fuel
M18NBR or FKM inner lipzinc-plated or stainlesshydraulic
M20NBR or FKM inner lipzinc-plated or stainlesshydraulic
M22NBR inner lipzinc-plated steelhydraulic
M27NBR inner lipzinc-plated steelhydraulic

Applications & Industries for M8 USIT Rings

USIT Rings are bought for a small number of well-defined jobs. These are the ones we ship them for. Stocked from M6 to M27.

Industries that specify USIT Rings

  • Machine tools Coolant and hydraulic ports.
  • Hydraulics Port plugs and fittings.
  • Mobile plant Vibration-prone joints.
  • Compressors Sealing under pressure cycling.
  • Process & food equipment Sealing at joints that are cleaned and inspected.
  • Hydraulics & pneumatics Static and dynamic sealing in cylinders and valve bodies.

Typical applications

  • seating the ring square before tightening
  • choosing the self-centring form where the seat is imperfect
  • matching the thread size exactly
  • selecting FKM where the fluid or temperature demands it
  • excluding dust and moisture from a housing
  • sealing a joint against fluid or air pressure

Service conditions to specify against

Sealed joints
Used where the fixing has to keep water or air out as well as hold — the elastomer, not the fastener, decides service life.

Where to use something else

  • Do not reuse a bonded or USIT seal after it has been compressed; the elastomer has taken a set and will not seal a second time.

Full application guide: where USIT Rings are used, how to specify them, and the cases they are wrong for

Video: M8 USIT Rings (Self-Centring Bonded Seals) Dimensions

Video: M8 USIT Rings (Self-Centring Bonded Seals) Dimensions

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.

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 is the coarse-thread pitch of M8 for USIT Rings (Self-Centring Bonded Seals)?

For M8 the standard coarse pitch is 1.25 mm — this is the value used for USIT Rings (Self-Centring Bonded Seals).

What clearance and tapping drill suit M8?

Use a 9 mm clearance hole (ISO 273 medium) for through-fixing, or a 6.75 mm tapping drill for a coarse M8 thread.

How do I request a quotation?

Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day.