# National Rubber Corporation

> National Rubber Corporation (NRC) is an ISO 9001:2015 certified manufacturer of custom extruded, molded and die cut rubber parts, based in Canonsburg, Pennsylvania.

- Founded: 1997
- Address: 367 Morganza Road, Canonsburg, PA 15317, United States
- Phone: +1-412-831-6100
- Toll-free: +1-866-672-8100
- Fax: +1-412-831-6300
- Email: info@nationalrubber.com
- Website: https://www.nationalrubber.com/

The site does not list prices. Buyers send a quote request with part numbers or drawings, material, durometer and quantity. Prices, quantities, lead times, delivery and payment terms are those in NRC's written quotation. Part numbers, dimensions and drawings on the site are for general reference.

## Quotes and contact

- [Request a quote](https://www.nationalrubber.com/request-quote): send catalog part numbers or your own drawings, with material, durometer and quantity
- [Contact](https://www.nationalrubber.com/contact): phone, fax, email, address and a contact form

## Services

- [All services](https://www.nationalrubber.com/products)
- [Custom rubber molding](https://www.nationalrubber.com/products/custom-molding)
- [Custom rubber extrusion](https://www.nationalrubber.com/products/custom-extrusion)
- [Rubber die cutting](https://www.nationalrubber.com/products/die-cutting)
- [Secondary fabrication](https://www.nationalrubber.com/products/secondary-fabrication)
- [Custom rubber mixing](https://www.nationalrubber.com/products/custom-mixing)
- [Spiral wound gaskets](https://www.nationalrubber.com/products/spiral-wound-gaskets)

## Product catalog

The catalog lists 4,760 standard parts. Each part has its own page with its part number and dimensions, at https://www.nationalrubber.com/product-catalog/product/{part number} (for example https://www.nationalrubber.com/product-catalog/product/NRC-U-6001).

- [Product catalog](https://www.nationalrubber.com/product-catalog): all categories and a part search
- [Rubber Grommets](https://www.nationalrubber.com/product-catalog/category/grommets): military grommets and the quick grommet finder
- [Silicone Rubber Sheet and Sponge](https://www.nationalrubber.com/product-catalog/category/silicone-sheet): silicone sheet, soft, high strength, sponge, low compression set sponge and flame retardant sponge grades
- [Rubber U-Channels](https://www.nationalrubber.com/product-catalog/category/u-channels): extruded U channels, including beaded, teardrop, trapezoid slot, unequal leg and hollow bulb base styles
- [Rubber C-Channels](https://www.nationalrubber.com/product-catalog/category/c-channels): extruded C channels
- [Rubber H, L, T, P and E Strips](https://www.nationalrubber.com/product-catalog/category/miscshape): extruded H, L, T, P and E strips
- [Rubber Bumpers and Tubing](https://www.nationalrubber.com/product-catalog/category/bumpers): solid bumpers, bumper strips, rectangular tubing and cord
- [O-Rings and Rubber Washers](https://www.nationalrubber.com/product-catalog/category/o-ring): AS568, JIS B2401 and metric O-rings, O-ring cord and rubber washers

## O-ring size charts

Each chart lists every size of the matching catalog table, with ID, cross-section and OD in inches and millimetres, and links each size to its part page.

- [AS568 O-ring size chart](https://www.nationalrubber.com/specifications/as568): dash numbers -001 to -475 with ID and cross-section tolerances, and the tube fitting boss sizes -901 to -932
- [Metric O-ring size chart](https://www.nationalrubber.com/specifications/metric-o-ring-sizes): metric sizes by inside diameter, with the standard code of each size
- [JIS B2401 O-ring size chart](https://www.nationalrubber.com/specifications/jis-b2401): P and G series
- [RMA tolerance classes](https://www.nationalrubber.com/specifications/rma-tolerances): E1 to E3 extruded cross-sections, L1 to L3 cut lengths, A1 to A4 molded parts, sponge, with representative values
- [Specifications](https://www.nationalrubber.com/specifications): ASTM D2000 callouts, FDA-compliant materials, RMA tolerances and the other standards on this site

## Grommet and U-channel size charts

- [MS-35490 grommet size chart](https://www.nationalrubber.com/specifications/ms35490-grommets): inside diameter, groove width, groove diameter, outside diameter and thickness of each MS-35490 dash number, in inches and millimetres, each linked to its part page
- [U-channel size guide](https://www.nationalrubber.com/specifications/u-channel-sizes): every U-channel slot width in the catalog, in inches and millimetres, with the U-channel tables that have it

## Industries

- [Industries served](https://www.nationalrubber.com/industry)
- [Aerospace](https://www.nationalrubber.com/industry/aerospace)
- [Appliance](https://www.nationalrubber.com/industry/appliance)
- [Automotive](https://www.nationalrubber.com/industry/automotive)
- [Chemical processing](https://www.nationalrubber.com/industry/chemical-processing)
- [Construction](https://www.nationalrubber.com/industry/construction)
- [Defense and military](https://www.nationalrubber.com/industry/defense)
- [Electronics](https://www.nationalrubber.com/industry/electronics)
- [Food and dairy](https://www.nationalrubber.com/industry/food-and-dairy)
- [Healthcare](https://www.nationalrubber.com/industry/healthcare)
- [Transportation](https://www.nationalrubber.com/industry/transportation)

## Company

- [About](https://www.nationalrubber.com/about)
- [Gallery](https://www.nationalrubber.com/gallery)
- [Careers](https://www.nationalrubber.com/careers)
- [Privacy](https://www.nationalrubber.com/privacy)
- [Terms](https://www.nationalrubber.com/terms)

## Optional

- [XML sitemap](https://www.nationalrubber.com/sitemap.xml): every page above and every catalog variation and part page

## AI usage policy

The block below is the previous version of this file, unchanged. It sets out the terms for AI crawling and for use of this site's content.

```text
site: https://www.nationalrubber.com
owner: National Rubber Corporation
contact: info@nationalrubber.com
address: 367 Morganza Road, Canonsburg, PA 15317
canonical-host: https://www.nationalrubber.com
Sitemap: https://www.nationalrubber.com/sitemap.xml

version: 1.0

policies:
  allowed-use:
    - crawling and indexing for search/snippets
    - question answering and summarization that links back to source URLs
  disallowed-use:
    - training or fine-tuning models on our content without a signed license
    - creating or selling derivative datasets built from our content
    - biometric inference, face recognition, or attempts to derive PII
  attribution:
    - include source URL and the name "National Rubber Corporation" when quoting
  cache-retention-days: 30
  rate-limit:
    requests-per-second: 1
    burst-rps: 5
  crawl-delay-seconds: 1
  obey-robots: true

agents:
  General LLM agents — allowed to crawl with limits above
  - name: *
    allow: /
    disallow:
      - /api/
      - /app/api/
      - /admin/

  Explicit declarations for common LLM-related bots/extensions
  - name: GPTBot
    allow: /
    disallow: [/api/, /app/api/, /admin/]
    crawl-delay-seconds: 1

  - name: CCBot
    allow: /
    disallow: [/api/, /app/api/, /admin/]
    crawl-delay-seconds: 1

  - name: ClaudeBot
    allow: /
    disallow: [/api/, /app/api/, /admin/]
    crawl-delay-seconds: 1

  - name: PerplexityBot
    allow: /
    disallow: [/api/, /app/api/, /admin/]
    crawl-delay-seconds: 1

  Data-collection extensions (training explicitly not permitted without license)
  - name: Google-Extended
    training: disallow
  - name: Applebot-Extended
    training: disallow
  - name: Amazonbot
    training: disallow

legal:
  copyright: © National Rubber Corporation. All rights reserved.
  license: Any training or dataset use requires a separate, signed license from the owner.

notes:
  - This llms.txt complements (does not replace) robots.txt.
  - Use the canonical host listed above; do not alternate between apex and www.
  - Contact us to discuss licensed data partnerships.


```