Nuts · EPDM Rubber Well Nuts

EPDM Rubber Well Nuts Trade series (rubber blind nuts) (EH-NUT-WELL-EPDM)

5 catalogued sizes, dimensioned to Trade series (rubber blind nuts). Pick any row and the technical drawing redraws to it.

EPDM Rubber Well Nuts to Trade series (rubber blind nuts) are catalogued in sizes M3 to M8, with dia 8-16 mm. 5 sizes are held in the table below, and the technical drawing redraws to whichever row you select.

Standard: Trade series (rubber blind nuts)
Size range: M3-M8
Dia: 8-16 mm
Catalogued sizes: 5

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

Applications & Industries

Where EPDM Rubber Well Nuts are used, and what decides the specification in each case. Stocked from M3 to M8.

Industries that specify EPDM Rubber Well Nuts

Vehicle body panels Rubber well nuts isolate and seal trim fasteners through thin skins.
Motorcycle service Blind rubber inserts provide a thread where the rear face is inaccessible.
Outdoor enclosures EPDM accommodates panel movement and keeps a small hole sealed.
Equipment covers Stainless inserts resist corrosion while the rubber body clamps the panel.
Maintenance & MRO Replacements matched to the existing bolt class, thread and finish.
Building services Threaded rod, channel and suspension assemblies.

Typical applications

adding a blind threaded point to a thin panel
matching hole diameter and grip range to the EPDM body
tightening only to the representative torque for the size
using the rubber body for isolation and sealing
completing a bolted joint on a stud, rod or bolt
locking an adjustment so it cannot drift

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.
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.
Match the class: A nut below the bolt property class strips before the bolt reaches its own limit — pair class 8 nuts with 8.8 bolts, class 10 with 10.9.

Where to use something else

Do not over-tighten a well nut; excess compression can pull the insert through the panel or damage the seal.

Full application guide: where EPDM Rubber Well Nuts 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 EPDM Rubber Well Nuts Trade series (rubber blind nuts) (EH-NUT-WELL-EPDM)

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

Request a Quotation

Specification

Item / category Standard Size(s) Material / finish Quantity

Business Information

Company * Contact Name * Email * Phone (with country code) Country / Region

Notes

Dimensions & Specifications (Trade series (rubber blind nuts))

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

Thread size	Representative hole diameter (mm)	Representative grip range (mm)	Temperature range (u00b0C)	Representative tightening torque (Nu00b7m)	Body / insert
M3	8.0	0.4~4.0	-30~+80	0.5	EPDM rubber / stainless threaded insert
M4	8.0	0.4~4.0	-30~+80	0.4	EPDM rubber / stainless threaded insert
M5	9.7	0.4~4.9	-30~+80	0.6	EPDM rubber / stainless threaded insert
M6	12.8	0.4~4.0 or 0.8~4.7	-30~+80	1.0	EPDM rubber / stainless threaded insert
M8	16.0	0.4~4.0	-30~+80	1.5	EPDM rubber / stainless threaded insert

EPDM Rubber Well Nuts conform to Trade series (rubber blind nuts). As nuts, they are specified by the dimensions in the table below; this page also covers materials, finishes and typical uses.

What Are EPDM Rubber Well Nuts?

EPDM Rubber Well Nuts are nuts defined by Trade series (rubber blind nuts). They are selected by thread 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

EPDM Rubber Well Nuts are supplied to order. Pricing starts from approximately US$0.090 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.

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.
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.
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.
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 EPDM Rubber Well Nuts manufactured to?

EPDM Rubber Well Nuts are manufactured to Trade series (rubber blind nuts). The dimensional values on this page follow that standard.

Which sizes of EPDM Rubber Well Nuts does Engineering Hardware supply?

The table on this page lists 5 sizes for EPDM Rubber Well Nuts, ranging from M3 to M8. Sizes outside the table can be quoted on request.

In which materials are EPDM Rubber Well Nuts supplied?

EPDM Rubber Well Nuts are supplied in matching property-class steel and stainless A2 / A4, with finishes including zinc plating, hot-dip galvanizing and black oxide. Choose material and finish to suit the load and the service environment for EPDM Rubber Well Nuts.

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.