M33 Bonded Sealing Washers dimensions to Trade series (bonded seal washer, Dowty pattern): inside diameter 33.5 mm, outside diameter 43 mm, thickness 2.5 mm, coarse thread pitch 3.5 mm.
- Inside diameter
- 33.5 mm
- Outside diameter
- 43 mm
- Thickness
- 2.5 mm
- Coarse thread pitch
- 3.5 mm
Figures are nominal values from the governing standard. Confirm against the tolerance class for your application before machining or ordering.
Dimensional data for M33 Bonded Sealing Washers to Trade series (bonded seal washer, Dowty pattern), with 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.
M33 Dimensional Row (Trade series (bonded seal washer, Dowty pattern))
| Thread size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Thickness s (mm) | Seal material | Max temperature (deg C) | Reference standard |
|---|
| M33 | 33.5 | 43 | 2.5 | NBR | 120 | Trade series (bonded seal washer, Dowty pattern) |
Mating Parts for M33
A M33 flat washer pairs with a M33 bolt/screw and matching M33 nut.
Custom manufacturing · Made to drawing
Need bonded sealing washers in a size this table does not list?
This page covers M33 bonded sealing washers. Bore, outside diameter, thickness, temper and finish are the variables here — there is no thread to specify, so the fit and the bearing area are what the drawing has to pin down. Made by stamping or punching.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
Custom washer manufacturingSend a drawing
Applications & Industries for M33 Bonded Sealing Washers
The sectors that buy Bonded Sealing Washers, and the duty each one buys them for. Stocked from M4 to M36.
Industries that specify Bonded Sealing Washers
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Automotive service
Service items replaced at every oil change.
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Hydraulics & fuel systems
Banjo bolts, sump plugs and pressure fittings.
-
Roofing & cladding
Fixings that must keep water out.
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Machine building & OEM
Setting bearing area on soft alloy, plastic and oversized holes.
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Timber & construction
Large-diameter washers that stop pull-through in softer material.
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Rotating & vibrating plant
Spring, tooth and wedge types that maintain or lock bolt tension.
Typical applications
- crush washers are single use by design
- sealing a threaded fitting against pressure
- maintaining bolt tension in a joint that settles
- spreading clamp load over a soft or oversized bearing face
- protecting a painted or plated surface under a turned nut
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.
- 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.
- Hardness matters
- Under a high-strength bolt a soft washer embeds into the joint and preload is lost — specify a hardened washer for structural bolting.
Full application guide: where Bonded Sealing Washers are used, how to specify them, and the cases they are wrong for
