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O-Ring RFQ Checklist: 20 Data Points Your Supplier Needs Before Quoting
KELOR Valves — An O-ring may be the smallest component in your bill of materials, but specifying the wrong compound, durometer, or tolerance in your RFQ can cause seal failure, equipment downtime, and safety incidents that cost far more than the O-ring itself. This checklist gives you 20 essential data points that every O-ring supplier needs to provide a fast, accurate quotation — complete with a ready-to-use RFQ template and a filled sample for reference.
Checklist at a Glance
20 Data PointsAcross 5 critical categories
Template IncludedCopy, fill, and send
Sample RFQFilled example for reference
Quote Speed4-12 hrs with complete data
Table of Contents
- Why O-Ring RFQs Fail and Cost You Time
- Category A: Material & Compound (Points 1-5)
- Category B: Dimensions & Geometry (Points 6-10)
- Category C: Operating Conditions (Points 11-14)
- Category D: Quantity & Commercial (Points 15-17)
- Category E: Quality & Compliance (Points 18-20)
- 6 Common O-Ring RFQ Mistakes
- O-Ring Material Selection Quick Reference
- O-Ring RFQ Template — Ready to Copy & Fill
- Sample Filled O-Ring RFQ
- Industry-Specific Application Tips
- Frequently Asked Questions
1. Why O-Ring RFQs Fail and Cost You Time
O-rings are deceptively simple components — a torus-shaped seal that appears straightforward to specify. However, the global O-ring market offers thousands of compound formulations, dozens of size standards (AS568, metric, JIS, DIN), and a wide range of durometer options that dramatically affect sealing performance. When a buyer submits an RFQ stating only “NBR O-ring, 50mm” without specifying durometer, tolerance class, temperature range, chemical media, or certification requirements, the supplier faces a dilemma: either quote the cheapest standard option and risk delivering a seal that fails in service, or invest time in sending clarification emails that delay the quotation by 2-4 business days.
74%O-ring RFQs lack key data
2-4 daysAverage delay from vague RFQs
4-12 hrsQuote time with complete RFQ
42%Of seal failures from wrong material
The Hidden Cost of an Incomplete O-Ring RFQ
Unlike flanges or valves where dimensional mismatches are caught during fit-up, O-ring failures often occur after installation — during pressure testing, commissioning, or even months into operation. A Viton O-ring that costs 3-4 times more than NBR may be essential for your chemical service, but if your RFQ only says “rubber O-ring” the supplier will quote NBR by default. The resulting seal failure in a corrosive environment can cause fluid leaks, environmental contamination, unplanned shutdowns, and safety hazards that cost 100-1000 times the price difference between the two compounds. The 20-point checklist below eliminates this risk by ensuring your RFQ communicates every variable the supplier needs.
2. Category A: Material & Compound (Points 1-5)
The material compound is the single most critical variable in any O-ring specification. It determines chemical resistance, temperature capability, compression set behaviour, and cost. These five data points define exactly which compound formulation the supplier should quote, eliminating ambiguity between the hundreds of NBR, EPDM, FKM, and silicone grades available in the market.
| # | Data Point | Why It Matters | Example Values |
|---|---|---|---|
| 1 | Material / Compound | Determines chemical resistance, temperature range, and cost. NBR costs one-third of Viton. Wrong compound equals seal failure. | NBR (Nitrile), EPDM, FKM (Viton), Silicone (VMQ), FFKM (Kalrez), HNBR, CR (Neoprene), AFLAS |
| 2 | Durometer Hardness | Shore A scale (50-90). Softer seals conform better to rough surfaces; harder seals resist extrusion at high pressure. Standard is 70 Shore A. | 50 Shore A (soft), 70 Shore A (standard), 80 Shore A (hard), 90 Shore A (extra hard) |
| 3 | Colour Preference | Colour aids visual identification during installation and maintenance. Black is standard and cheapest; custom colours add 10-20% to cost. | Black (standard), Green (EPDM), Brown (Viton), Red (high-temp), White (food grade), Blue (identification) |
| 4 | Size Standard | Determines the dimensional reference system. AS568 is common in North America and aerospace; metric (ISO 3601) is standard in India, Europe, and general industry. | AS568 (dash numbers), ISO 3601 (metric), JIS B 2401, DIN 3771, custom / non-standard |
| 5 | Compound Grade / Specification | Differentiates between general-purpose and premium formulations within the same base polymer. A premium FKM grade may handle 50 degrees Celsius more than a standard grade. | ASTM D1418 designation, specific manufacturer compound code, NORSOK M-710 for oil and gas, FDA 21 CFR 177.2600 for food |
Critical: Always Specify Compound Grade, Not Just Base Polymer
Writing “FKM” or “Viton” in your RFQ is insufficient. FKM encompasses dozens of sub-grades with vastly different chemical and temperature capabilities. A standard FKM Type 1 handles most mineral oils up to 200 degrees Celsius, while FKM Type 3 (peroxide-cured) is required for aggressive amines and polar solvents. Similarly, “NBR” ranges from 18% to 50% acrylonitrile content — a low-nitrile NBR has excellent low-temperature flexibility but poor oil resistance, while a high-nitrile NBR has excellent oil resistance but poor low-temperature performance. Always specify the ASTM grade or equivalent, or describe your chemical media and let the supplier recommend the appropriate compound.
3. Category B: Dimensions & Geometry (Points 6-10)
O-ring dimensions directly determine seal performance. An O-ring that is even 0.5 mm oversized or undersized may not seat properly in the gland, leading to leakage or extrusion. These five data points ensure the quoted O-ring matches your gland design exactly, whether you are using standard catalogue sizes or require custom moulded dimensions.
| # | Data Point | Why It Matters | Example Values |
|---|---|---|---|
| 6 | Inner Diameter (ID) | Primary sizing dimension. Must match gland bore or piston diameter per design standard. Controls stretch and squeeze. | AS568-214 = 1.875″ (47.63 mm), Metric ID 50 mm, ID 120.5 mm (custom) |
| 7 | Cross-Section / Cord Diameter (CS) | Determines gland depth, seal compression, and load. Standard CS values: 1.78 mm (0.070″), 2.62 mm (0.103″), 3.53 mm (0.139″). | 1.78 mm, 2.62 mm, 3.53 mm, 5.33 mm, 7.00 mm |
| 8 | Tolerance Class | Controls dimensional precision. Standard tolerances (ISO 3601-1 Class N) suit most applications. Precision tolerances (Class S) cost 20-40% more. | ISO 3601-1 Class N (standard), Class S (precision), Class A (aerospace), AS568 tolerances |
| 9 | O-Ring Type | Standard O-rings are moulded and spliced. Custom profiles, X-rings (quad rings), and back-up rings serve different sealing needs. | Standard moulded O-ring, spliced O-ring (large ID), X-ring (quad seal), hollow O-ring, encapsulated O-ring, PTFE-coated |
| 10 | Gland Design Reference | Providing gland dimensions allows the supplier to verify O-ring fit. Critical for custom applications where standard sizes may not be optimal. | Gland ID, gland depth, gland width, clearance gap, or reference to AS568-A gland design table |
Pro Tip: Provide Gland Dimensions When Possible
If you have the gland design data (bore diameter, groove width, groove depth, clearance gap), include it in your RFQ. This allows the supplier to cross-verify that the O-ring size you specified will achieve the correct compression (typically 15-30% for static seals and 10-20% for dynamic seals). Many buyers specify an O-ring size based on an old drawing without verifying it against the actual gland — a supplier who can check the gland fit can catch errors before production, saving you from receiving thousands of incorrectly sized seals.
4. Category C: Operating Conditions (Points 11-14)
Operating conditions are the bridge between your application and the correct material selection. Two O-rings with identical dimensions and material can perform completely differently depending on the temperature, pressure, chemical environment, and type of motion they experience. These four data points give the supplier the context needed to validate or recommend the right compound for your service conditions.
| # | Data Point | Why It Matters | Example Values |
|---|---|---|---|
| 11 | Temperature Range | Every compound has a defined operating range. Exceeding it causes hardening, cracking, or permanent compression set. Must include min and max. | -40 to +120 degrees Celsius (NBR), -20 to +200 degrees Celsius (FKM), -60 to +230 degrees Celsius (VMQ) |
| 12 | Pressure | High pressure requires harder durometer, anti-extrusion rings, and tighter gland clearances. Affects compound selection and gland design validation. | Static: up to 10 bar, 100 bar, 350+ bar; Dynamic: up to 200 bar with back-up rings |
| 13 | Chemical Media | The most important factor for compound compatibility. Even trace chemicals (1-2% concentration) can degrade certain compounds rapidly. | Hydraulic oil (ISO VG 46), seawater, 30% sulphuric acid, natural gas with H2S, steam at 180 degrees Celsius, potable water |
| 14 | Sealing Type | Dynamic seals (reciprocating, rotary, oscillating) require lower friction compounds and tighter tolerances than static seals. Affects cost. | Static (face seal, radial seal), Reciprocating (piston, rod), Rotary (shaft), Oscillating, Vacuum |
5. Category D: Quantity & Commercial (Points 15-17)
Quantity and commercial terms directly affect the per-unit price, lead time, and logistics cost of your O-ring order. O-rings are typically moulded in cavities of 4 to 64 pieces per cycle, so quantity determines how many mould cycles are needed and whether the supplier can offer volume-based pricing. These three data points complete the commercial picture for accurate quotation.
| # | Data Point | Why It Matters | Example Values |
|---|---|---|---|
| 15 | Quantity per Size | Drives mould utilisation and discount tier. 10,000+ pcs qualifies for mould amortisation across volume. Small quantities (under 100) may use spliced or machined O-rings. | Per line item: 50 pcs, 500 pcs, 10,000 pcs, 100,000 pcs annual blanket |
| 16 | Annual Forecast / Repeat Order | Suppliers offer 10-25% better pricing for committed annual volumes or blanket orders. Helps supplier plan raw material procurement and mould allocation. | One-time purchase, quarterly release (5,000 pcs/quarter), annual blanket (20,000 pcs/year), call-off agreement |
| 17 | Delivery & Incoterms | Standard O-rings ship in 7-10 working days; custom moulded sizes take 15-25 days plus mould cost. Exotic compounds may need import lead time. | Ex-works Ahmedabad, FOB Mumbai, CIF Mundra, delivered to site; Standard 10 days or Urgent 3-5 days |
6. Category E: Quality & Compliance (Points 18-20)
Quality and compliance requirements add cost and lead time but are non-negotiable in regulated industries. An O-ring used in food processing requires FDA-compliant compound; an O-ring in offshore oil and gas needs NORSOK or NACE qualification; a pharmaceutical O-ring needs USP Class VI validation. These three data points ensure the quoted O-rings meet your regulatory and performance requirements from the start, avoiding costly rework and qualification delays.
| # | Data Point | Why It Matters | Example Values |
|---|---|---|---|
| 18 | Certifications Required | Regulatory compliance adds 15-40% to compound cost. Must be stated upfront. Suppliers cannot retroactively certify a non-compliant compound. | FDA 21 CFR 177.2600, USP Class VI, NSF/ANSI 61, WRAS, NORSOK M-710, NACE MR0175, EU REACH, RoHS |
| 19 | Testing Requirements | Additional testing (tensile, compression set, ageing, fluid immersion) adds 5-15 days to lead time and 5-10% to cost. Critical for critical service applications. | Certificate of Conformity (CoC), material test report (MTC), third-party test report, lot traceability, batch sampling |
| 20 | Packaging & Labelling | Custom packaging (individual bags, labelled by size, with MSDS) adds cost but prevents installation errors. Clean-room packaging is essential for pharma and semiconductor. | Bulk pack, individual polybag per size, heat-sealed labelled bags, clean-room packaging, OEM branded packaging, barcoded |
7. Six Common O-Ring RFQ Mistakes That Delay Quotes
After analysing common patterns in O-ring procurement, the following six mistakes are the most frequent causes of delayed quotations, incorrect deliveries, and seal failures. Each one is easily avoidable with the 20-point checklist above.
1
Vague Material: “Rubber O-ring”
Writing “rubber O-ring” without specifying NBR, EPDM, FKM, or other compound forces the supplier to guess. The cheapest option (NBR) will be quoted, which may fail in your actual chemical environment. Always name the compound and grade.
2
Missing Durometer
Omitting the hardness means the supplier quotes standard 70 Shore A, which may be too soft for your 200-bar pressure or too hard for your low-pressure static seal with a rough gland surface. Always specify the required durometer.
3
No Chemical Media Listed
Even if you know the compound, stating the actual chemical media (e.g., “hydraulic oil ISO VG 46 with 5% water contamination”) allows the supplier to verify compatibility and flag potential issues before production.
4
Only One Dimension Given
Stating “O-ring 50mm” without specifying whether this is the ID, OD, or CS, and without giving the cross-section, makes the size ambiguous. Provide both ID and CS, or the dash number, or all three (ID, OD, CS).
5
Ignoring Certifications Until Later
Requesting FDA compliance or NORSOK qualification after receiving the initial quote forces the supplier to re-quote with a different compound grade, often at 15-40% higher cost. State all certifications upfront in the RFQ.
6
No Quantity Breakdown per Size
Sending a list of 30 sizes with “quantity: TBA” or “various” prevents the supplier from calculating mould utilisation and offering tiered pricing. Provide estimated quantities, even if approximate.
8. O-Ring Material Selection Quick Reference
The following table provides a quick-reference comparison of the most common O-ring materials, their temperature capabilities, key chemical resistance strengths, and typical applications. Use this as a starting point when drafting your RFQ, and always confirm the final compound selection with your supplier based on your specific operating conditions.
| Material | Temp Range | Best Chemical Resistance | Limitations | Typical Applications |
|---|---|---|---|---|
| NBR (Nitrile) | -40 to +120 degrees C | Oils, fuels, greases, hydraulic fluids, water | Poor ozone/weather resistance; not for ketones or chlorinated solvents | Hydraulic systems, fuel handling, automotive, general industrial |
| EPDM | -50 to +150 degrees C | Water, steam, glycol, dilute acids and alkalis, weather, ozone | Poor resistance to oils, fuels, and hydrocarbons | Water treatment, plumbing, HVAC, pharmaceutical, automotive cooling |
| FKM (Viton) | -20 to +200 degrees C | Aggressive chemicals, acids, oils, fuels, high-temperature fluids | Expensive (3-5x NBR); poor resistance to ketones, esters, and amines (use FKM Type 3 for these) | Chemical processing, oil and gas, aerospace, semiconductor, automotive fuel systems |
| VMQ (Silicone) | -60 to +230 degrees C | Extreme temperatures, ozone, weathering, dry heat | Poor tensile strength and tear resistance; not for oils, fuels, or high-pressure dynamic seals | Food processing, medical devices, high-temperature static seals, consumer appliances |
| HNBR | -40 to +150 degrees C | Oils, fuels, hydrogen sulphide, amines, hot water | More expensive than standard NBR; limited availability in small quantities | Oil and gas (downhole), automotive (AC systems), heavy-duty hydraulics |
| FFKM (Kalrez) | -20 to +327 degrees C | Nearly all chemicals including aggressive acids, bases, and solvents | Extremely expensive (10-30x FKM); limited sizes in stock | Semiconductor, pharmaceutical, chemical processing, analytical instruments |
| CR (Neoprene) | -40 to +120 degrees C | Refrigerants, mild acids, weather, ozone, moderate oils | Not for strong acids, ketones, or ester-based fluids | Refrigeration, HVAC, marine, general-purpose industrial sealing |
9. O-Ring RFQ Template — Ready to Copy & Fill
The template below incorporates all 20 data points from this checklist. Copy it into your email or document, fill in the highlighted fields, and send it to your O-ring supplier. The structured format ensures no critical information is missed and enables the supplier to respond quickly with an accurate quotation.
Blank O-Ring RFQ Template
O-RING REQUEST FOR QUOTATION ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Date: [DD/MM/YYYY] Company: [Your Company Name] Contact: [Name, Email, Phone] RFQ Ref: [Your Internal RFQ Number] Quote Validity:[30 / 60 / 90 days] ─── MATERIAL & COMPOUND ─── 1. Material: [NBR / EPDM / FKM / VMQ / HNBR / Other: ____] 2. Durometer: [50 / 60 / 70 / 80 / 90] Shore A 3. Colour: [Black / Green / Brown / White / Custom: ____] 4. Size Standard: [AS568 / ISO 3601 Metric / JIS / Custom] 5. Compound Spec: [ASTM grade / NORSOK M-710 / FDA / Other: ____] ─── DIMENSIONS ─── Item Standard/Ref ID (mm) CS (mm) Qty Tolerance ────────────────────────────────────────────────────────── 1 [dash#/ref] [___] [___] [___] [Class N/S] 2 [dash#/ref] [___] [___] [___] [Class N/S] 3 [dash#/ref] [___] [___] [___] [Class N/S] (add rows as needed) ─── OPERATING CONDITIONS ─── 11. Temperature: Min [___] degrees C / Max [___] degrees C 12. Pressure: [___] bar (static / dynamic) 13. Chemical Media: [List all fluids: _____________] 14. Sealing Type: [Static / Reciprocating / Rotary / Oscillating / Vacuum] ─── COMMERCIAL ─── 15. Quantity: Per line item (see table above) 16. Annual Forecast: [One-time / ___ pcs/year blanket order] 17. Delivery: [Incoterm] / Location: [________] / Required by: [DD/MM/YYYY] ─── QUALITY & COMPLIANCE ─── 18. Certifications: [FDA / USP Class VI / NSF / NORSOK / NACE / None] 19. Testing: [CoC / MTC / Third-party test / None] 20. Packaging: [Bulk / Individual bag / Labelled / Clean-room / OEM branded] ─── ADDITIONAL NOTES ─── [ gland dimensions, installation method, expected service life, etc. ]
10. Sample Filled O-Ring RFQ
The sample below demonstrates how a well-structured O-ring RFQ looks when filled out for a real procurement scenario. This example covers a chemical processing plant that needs O-rings for three different sealing applications across multiple equipment types.
Filled Sample — Chemical Processing Plant O-Rings
O-RING REQUEST FOR QUOTATION
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Date: 15/08/2026
Company: Jyoti Process Systems Pvt. Ltd., Vadodara, Gujarat
Contact: Rajesh Mehta, r.mehta@jyotiprocess.in, +91-9876543210
RFQ Ref: JPS-RFQ-2026-0847
Quote Validity:60 days
─── MATERIAL & COMPOUND ───
1. Material: FKM (Viton) Type 2 — general acid/alkali service
2. Durometer: 75 Shore A
3. Colour: Brown (standard Viton identification)
4. Size Standard: ISO 3601 Metric
5. Compound Spec: ASTM D1418 FKM, NORSOK M-710 qualified preferred
─── DIMENSIONS ───
Item Standard/Ref ID (mm) CS (mm) Qty Tolerance
───────────────────────────────────────────────────────────
1 ISO 3601-1 25.00 3.55 2,000 Class N
2 ISO 3601-1 32.00 3.55 1,500 Class N
3 ISO 3601-1 40.00 3.55 1,000 Class N
4 ISO 3601-1 50.00 3.55 800 Class N
5 ISO 3601-1 65.00 3.55 600 Class N
6 ISO 3601-1 80.00 3.55 400 Class N
7 ISO 3601-1 100.00 5.30 300 Class N
8 ISO 3601-1 125.00 5.30 200 Class N
9 ISO 3601-1 150.00 5.30 150 Class N
10 ISO 3601-1 200.00 5.30 100 Class N
───────
Total: 7,050 pcs
─── OPERATING CONDITIONS ───
11. Temperature: Min -10 degrees C / Max +180 degrees C
12. Pressure: Up to 16 bar (static face seals on flanged connections)
13. Chemical Media: 30% Sulphuric Acid (H2SO4), Sodium Hydroxide (NaOH) 20%,
Trace hydrocarbons, Occasional steam cleaning at 150 degrees C
14. Sealing Type: Static — flanged pipe connections and manway gasket grooves
─── COMMERCIAL ───
15. Quantity: As per line items above (7,050 pcs total)
16. Annual Forecast: Quarterly releases — approx 5,000 pcs/quarter over 2 years
(estimated 40,000 pcs annual blanket)
17. Delivery: Ex-Works Ahmedabad / First delivery required by 05/09/2026
─── QUALITY & COMPLIANCE ───
18. Certifications: NORSOK M-710 (if available), EN 10204 3.1 MTC
19. Testing: Certificate of Conformity + material test report per batch
20. Packaging: Individual heat-sealed polybags labelled with size, material,
batch number, and Jyoti Process Systems PO reference
─── ADDITIONAL NOTES ───
- Gland design per ISO 3601-2 static seal recommendations.
- Supplier to confirm chemical compatibility of proposed FKM compound with
30% H2SO4 at 180 degrees C before production.
- First article inspection (FAI) report required for each new size.
- Preferred payment terms: 30% advance, 70% against dispatch documents.
Why This Sample RFQ Works
This sample covers every one of the 20 checklist data points in a structured format. The supplier receives complete material specifications (FKM Type 2, 75 Shore A, NORSOK M-710), full dimensional data for 10 line items (7,050 pieces total), detailed operating conditions (specific chemicals with concentrations and temperatures), clear commercial terms (blanket order with quarterly releases, Ex-Works Ahmedabad), and explicit quality requirements (MTC, FAI, labelled packaging). A supplier receiving this RFQ can provide a firm, accurate quotation within 4-8 hours without a single clarification email — compared to 2-4 days for a vague enquiry.
11. Industry-Specific Application Tips
Different industries impose unique requirements on O-ring selection. The following four industry profiles highlight the key considerations that should appear in your RFQ based on your application sector. These tips help you go beyond the standard 20-point checklist and include industry-specific details that improve quote accuracy.
Oil & Gas
Specify NORSOK M-710 or NACE MR0175 compliance. State H2S partial pressure and presence of amine-based corrosion inhibitors. HNBR is preferred for downhole applications; FKM Type 3 for surface processing with aggressive amines. Always request lot traceability and burst pressure testing documentation.
Food & Pharmaceutical
Require FDA 21 CFR 177.2600 or EU Regulation 1935/2004 compliance. For pharmaceutical, specify USP Class VI or EP 3.1.5 extractables testing. White or blue colour is standard for visibility. Request clean-room packaging (Class 8 / ISO 14644-1 minimum). EPDM is most common for hot water and CIP; silicone for extreme temperature cycling.
Water & Wastewater
EPDM is the standard material for potable and wastewater applications. Specify NSF/ANSI 61 or WRAS certification for drinking water contact. Chlorine-resistant EPDM formulations are required for chlorinated water (above 2 ppm free chlorine). Temperature range is typically 5-60 degrees Celsius. Black EPDM is standard and most economical.
Chemical Processing
List all chemicals with maximum concentrations, temperatures, and exposure durations. FKM (Viton) handles most aggressive chemicals; FFKM (Kalrez, Chemraz) is required for the most severe environments (hot concentrated acids, mixed solvent systems). Specify compression set requirements (less than 20% after 70 hours at operating temperature is typical for critical service).
12. Frequently Asked Questions
What information is needed in an O-ring RFQ?
A complete O-ring RFQ requires at minimum 20 data points across five categories: material and compound specification, dimensions (ID, cross-section, tolerances), operating conditions (temperature range, pressure, chemical media, static or dynamic service), quantity and delivery requirements, and quality or certification needs. Missing compound grade, durometer hardness, or chemical exposure details are the most common omissions that delay accurate quoting.
How do I know which O-ring material to specify in my RFQ?
The material depends on three factors: the chemical media the O-ring will contact, the operating temperature range, and the pressure. Nitrile (NBR) suits oils and fuels up to 120 degrees Celsius. EPDM is best for water, steam, and weather exposure. Viton (FKM) handles aggressive chemicals and temperatures up to 200 degrees Celsius. Silicone (VMQ) covers extreme temperatures from minus 60 to plus 230 degrees Celsius but has lower chemical resistance. If unsure, describe your application in the RFQ and ask the supplier to recommend the compound.
What is durometer hardness and why does it matter in an O-ring RFQ?
Durometer (Shore A) measures the O-ring material’s resistance to indentation. Standard O-rings are 70 Shore A, suitable for most static and dynamic seals. Softer compounds (50-60 Shore A) provide better sealing on rough or uneven surfaces but may extrude under high pressure. Harder compounds (80-90 Shore A) resist extrusion in high-pressure applications but may not conform well to surface imperfections. Always specify the durometer in your RFQ because it directly affects sealing performance and price.
How long does it take to get an O-ring quote from Indian suppliers?
For standard AS568 or metric O-rings in common materials (NBR, EPDM, Viton) with complete RFQ data, Indian suppliers typically respond within 4-12 hours. Incomplete RFQs requiring clarification about material compatibility or dimensions take 2-4 additional days. Custom-size O-rings, non-standard compounds, or orders requiring mould development add 3-5 working days for tooling cost estimation.
Should I specify AS568 dash numbers or metric sizes in my O-ring RFQ?
Both systems are widely used. AS568 dash numbers (e.g., AS568-214, AS568-325) are the standard in North American and aerospace applications. Metric sizes (e.g., ID 25 x CS 3.55 mm) are standard in European, Indian, and general industrial applications. Always specify the standard you are using. If you only have the gland dimensions, provide those and let the supplier calculate the O-ring size — but state clearly whether you need AS568 or metric sizing.
Can I use a single RFQ for multiple O-ring sizes and materials?
Yes, and this is recommended for project procurement. A well-structured O-ring RFQ can include 50 to 200 plus line items covering different sizes, materials, and durometers in a single tabular format. Consolidating your entire requirement into one RFQ shows total order volume, which often unlocks better per-unit pricing through volume discounts and reduces administrative overhead compared to sending multiple separate enquiries.
What certifications should I request in an O-ring RFQ?
For general industrial use, request a material certificate with compound composition and physical properties. For food and pharmaceutical applications, specify FDA 21 CFR 177.2600 compliance or USP Class VI certification. For oil and gas, request NORSOK M-710 or NACE MR0175 compatibility confirmation. For drinking water, specify NSF/ANSI 61 certification. For aerospace, require AS5780 or equivalent. Always state certification requirements upfront to avoid re-quoting and delays.
Ready to Submit Your O-Ring RFQ?
Use the 20-point checklist and template above to send a complete enquiry. Krishna Industries (KELOR) responds to complete O-ring RFQs within 4-12 working hours.
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