ASTM A194 Grade 7M Heavy Hex Nuts
ASTM A194 Grade 7M heavy hex nuts — quenched and tempered alloy steel sharing Grade 7's AISI 4140-type chemistry row (C 0.37–0.49%, Cr 0.75–1.20%, Mo 0.15–0.25%), the controlled-hardness member of the grade-7 family. Mechanical rows specific to 7M are not tabulated in the collected sources and are not asserted.
Last updated: 2026-11
Specifications
Grade 7M is the "M" companion of Grade 7 in ASTM A194: the collected chemistry table prints one row for "7 and 7M (AISI 4140)" — carbon 0.37–0.49%, manganese 0.65–1.10%, chromium 0.75–1.20%, molybdenum 0.15–0.25% — and the grade table titles it "Quenched & tempered alloy steel hvy hex nut". The "M" marks the service-controlled variant of the family, as it does in the 2/2H/2HM family: 7M is specified where the application's qualification regime (for example low-temperature or hardness-controlled service with matched studs) calls the M grade explicitly rather than the base grade. The collected sources print no separate chemistry row, hardness band or proof-load ladder for 7M — its condition differs from base grade 7, so the grade-7 figures are not carried over — and none are asserted here. Confirm chemistry, hardness and proof load on the mill certificate against the size and condition of record.
| Standard | ASTM A194 — Grade 7M (heavy hex pattern) |
|---|---|
| Material | Chromium-molybdenum alloy steel, AISI 4140 type, quenched and tempered — controlled variant of grade 7 |
| Chemistry (7 and 7M row) | C 0.37–0.49%, Mn 0.65–1.10%, P max 0.04%, S max 0.04%, Si 0.15–0.35% (transcription note on the grade 7 page applies), Cr 0.75–1.20%, Mo 0.15–0.25% |
| Family relationship | Shares the grade 7 chemistry row; the "M" marks the service-controlled variant of the family (pattern parallels 2H/2HM) |
| Hardness / proof load | Not tabulated in the collected sources for 7M — the base grade 7 rows do not carry over; confirm per mill certificate against the size and condition of record |
Materials
- Chromium-molybdenum alloy steel (AISI 4140 type), quenched and tempered
Ordering & documentation
Documents
Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.
Quotation
- The fastener family (ASTM A194 Grade 7M Heavy Hex Nuts) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
- Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
- Quantity per size and your target delivery date.
- Destination country, and any required documents (for example a mill test certificate) so the quote includes them.
Sample & supply
Minimum order quantity is 10,000 pieces. Stock items run 3–7 days. Quantities or variants outside the standard range are confirmed at quotation.
Storage & shipping
Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.
Frequently asked questions
What does the "M" in Grade 7M change relative to Grade 7?
The chemistry stays the same — the collected table prints a single AISI 4140-type row for "7 and 7M" — but the M suffix designates the service-controlled variant of the family, the same pattern the specification uses for 2H and 2HM. In practice that means the M grade is ordered where the service qualification (hardness control or matched low-temperature stud regime) names it explicitly. Because the controlled condition differs from the base grade's, this page does not carry grade 7 mechanical figures across: the collected sources print no separate 7M rows, so hardness and proof load confirm per mill certificate.
Which studs pair with Grade 7M nuts?
The collected pairing tables cover the common pairs — B7M with 2HM in the carbon family, A320 L7 with grades 4 and 7 in the alloy family — but do not print a dedicated 7M row, so no pairing is asserted here beyond the grade table's own identification. Where a drawing or service specification calls 7M, it will name the stud specification of record alongside it; order both designations with mill certificates rather than substituting across the M boundary.
What is the MOQ and lead time for this nut type?
The minimum order quantity is 10,000 pieces. Stock items ship in 3–7 days; non-stock items are confirmed at quotation. Common diameters in this nut type are widely stocked; confirm the exact schedule against quantity and size mix at quotation.
What should an RFQ for this nut type state?
State the standard designation (for example DIN 985 or DIN 6923), nominal thread size and pitch (metric coarse unless fine pitch is required), material and strength pairing with the mating bolt, finish (plain, zinc, or hot-dip galvanized where compatible), required certificates such as a mill test report per EN 10204 3.1, and quantity per size — plus destination country.
Request a Quote
Get factory-direct pricing from the manufacturer.
What to include in your inquiry
- ✓ Standard and property class (e.g. DIN 912, ISO 4762, class 8.8) — or a drawing for custom parts.
- ✓ Sizes, lengths and thread type (metric or inch).
- ✓ Quantity per size and your target delivery date.
- ✓ Destination country, plus any coating or finish requirement.
- ✓ Any documents you need with the shipment (e.g. mill test certificate) so the quote includes them.
- ✓ Your inquiry goes straight to the factory team by email and gets a reply within 24 hours.
- ✓ Factory-direct pricing
- ✓ Standard and custom specifications
- ✓ Factory-direct export to buyers in Europe, Asia, the Americas and the Middle East
- ✓ Full fastener family support