The Hastelloy C276 DIN 934 hex nut is a corrosion-resistant metric fastener for chemical processing, marine, pollution-control, oil and gas, and other aggressive-service assemblies. HASTELLOY® is a Haynes International trademark; the generic alloy designation is Alloy C-276, UNS N10276, also associated with Werkstoff 2.4819. DIN 934:1987-10 is withdrawn but remains common in purchasing for legacy hex-nut geometry. The current German successor for regular hex nuts is DIN EN ISO 4032:2023-12. When finished-nut material and mechanical requirements are needed, ASTM F467M Alloy 276 provides a metric specification for M6 through M36.
Product Overview and Key Features
DIN 934 defines the familiar regular hex nut form. For C-276 products, the dimensional designation and alloy specification should be stated separately because DIN 934 does not establish nickel-alloy chemistry or mechanical properties.
- UNS N10276 nickel alloy: C-276 contains nickel with substantial chromium, molybdenum, and tungsten.
- Legacy DIN 934 geometry: useful for replacement parts and drawings that still specify withdrawn DIN dimensions.
- Metric internal threads: coarse threads are common, with legacy DIN fine-pitch options when specifically ordered.
- External hex drive: wrench flats support conventional installation and maintenance tools.
- Uncoated corrosion resistance: the alloy is normally used without sacrificial zinc plating.
Hastelloy C276 DIN 934 Hex Nut Specifications
Specification Overview
| Item | Specification / Purchasing Reference |
|---|---|
| Product form | Regular hexagon nut |
| Legacy dimensional standard | DIN 934:1987-10, withdrawn |
| Current German successor | DIN EN ISO 4032:2023-12, style 1 regular hex nuts |
| Material designation | Alloy C-276 / UNS N10276 / Werkstoff 2.4819 |
| Metric nut material option | ASTM F467M-06a(2025) Alloy 276, when specified |
| Raw material reference | ASTM B574-23 for UNS N10276 rod and bar |
| Common metric range | M6 to M36 when ASTM F467M is invoked |
| Common surface condition | Natural / uncoated, cleaned; specified lubricant where required |
DIN 934 Dimensions and Thread Details
The table retains DIN 934 dimensions because the product title specifically calls for DIN 934. P is coarse pitch, m nut height, s nominal width across flats, and e minimum width across corners. Dimensions are millimetres.
| Thread | P (mm) | m Min-Max (mm) | s Nom. (mm) | e Min. (mm) |
|---|---|---|---|---|
| M6 | 1.00 | 4.7-5.0 | 10 | 11.05 |
| M8 | 1.25 | 6.14-6.5 | 13 | 14.38 |
| M10 | 1.50 | 7.64-8.0 | 17 | 18.90 |
| M12 | 1.75 | 9.64-10.0 | 19 | 21.10 |
| M16 | 2.00 | 12.3-13.0 | 24 | 26.75 |
| M20 | 2.50 | 14.9-16.0 | 30 | 32.95 |
| M24 | 3.00 | 17.7-19.0 | 36 | 39.55 |
| M30 | 3.50 | 22.7-24.0 | 46 | 50.85 |
| M36 | 4.00 | 27.4-29.0 | 55 | 60.79 |
DIN EN ISO 4032 is the successor standard, but buyers should not assume every DIN 934 dimension is identical to the current ISO series. Wrench sizes changed for some nominal diameters. Replacement orders should therefore state whether legacy DIN 934 or current ISO 4032 geometry is required.
Material, Surface Condition and Mating Hardware
Alloy C-276 Material
Alloy C-276 is a nickel-chromium-molybdenum alloy with tungsten. Nominal composition is about 57% nickel, 16% chromium, 16% molybdenum, 5% iron, and 4% tungsten, with very low carbon and silicon. It is selected for resistance to oxidizing and reducing media, chloride stress-corrosion cracking, pitting, and crevice attack.
Finish and Lubrication Options
Natural or cleaned C-276 is the common starting condition. Zinc plating is generally unnecessary. Project-specific dry-film, fluoropolymer, or anti-galling lubricants may be used when friction control or assembly behavior requires them. Confirm finish and lubricant with the mating bolt or stud.
Matching Bolts and Studs
ASTM F468M Alloy 276 is the companion metric specification when a matched C-276 bolt, cap screw, or stud is required. ASTM B574 raw-material compliance alone does not prove finished-nut compliance with ASTM F467M. Buyers can also review Flybear’s industrial nut range.
Typical Applications and Selection Considerations
- Chemical reactors, scrubbers, heat exchangers, piping supports, and acid-handling equipment.
- Marine and offshore assemblies exposed to chlorides and aggressive process fluids.
- Pollution-control, wastewater, pulp and paper, and chemical-processing equipment.
- Oil and gas equipment where UNS N10276 is approved by the project specification.
Flybear’s industry fastening solutions provide additional application context. Final selection should consider temperature, chemical concentration, galvanic compatibility, mating-fastener material, thread engagement, lubricant, and the applicable design code. C-276 material alone does not establish allowable joint load or tightening torque.
Ordering and Quality Documentation
An RFQ should state DIN 934 legacy geometry or current ISO 4032 geometry, thread size and pitch, UNS N10276 / Alloy C-276, applicable ASTM F467M requirement, quantity, mating fastener, surface condition, lubricant, and required documentation. Buyers may request chemical analysis, material certificates, hardness or proof-load records, dimensional inspection, and Go/No-Go thread gauging. Flybear’s quality control and inspection page describes related support; exact acceptance criteria should be agreed for the order.
Frequently Asked Questions
Is DIN 934 still a current standard?
No. DIN 934:1987-10 is withdrawn. DIN EN ISO 4032:2023-12 is the current German standard for regular style 1 hex nuts. DIN 934 remains common on legacy drawings and in international fastener trade.
Is DIN 934 identical to ISO 4032?
No. They describe closely related regular hex nuts, but dimensional changes exist for some sizes. If interchangeability matters, specify the exact dimensional standard rather than treating DIN 934 and ISO 4032 as automatically equivalent.
What ASTM specification applies to metric C276 nuts?
ASTM F467M-06a(2025) covers metric nonferrous nuts from M6 through M36 and includes Alloy 276 / UNS N10276. Specify it when finished-nut material and mechanical requirements are required in addition to DIN geometry.
Does C276 need a corrosion-protective coating?
Usually not. C-276 is selected because the base alloy provides corrosion resistance. Coatings or lubricants may still be specified for friction control, identification, electrical isolation, or anti-galling behavior.
What information should I provide for quotation?
Provide size, pitch, DIN 934 or ISO 4032 geometry, UNS N10276 material requirement, quantity, mating hardware, finish, lubricant, operating environment, and required inspection documents. Include a drawing for legacy dimensions or special threads.
Request a Quote for Hastelloy C276 DIN 934 Hex Nuts
Send Flybear Industrial your Hastelloy C276 DIN 934 hex nut size, pitch, dimensional standard, UNS N10276 requirement, quantity, mating hardware, surface condition, lubricant, and documentation needs. Include a drawing when legacy DIN geometry or special tolerances must be retained. Submit the details through the Flybear fastener RFQ page for technical review and quotation.
