1095 equivalent grades: ASTM, EN, JIS, GB, DIN
1095 is high-carbon steel (spring / knife / blade steel) specified in ASTM A29. Substitutes are collected here from 6 standard systems; the grading column says whether a certificate covers the swap or an engineer has to. The full 1095 data sheet carries the composition and mechanical tables.
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1095 is cross-certified with CS100, C100S, SK95 (SK4): the composition windows overlap closely enough that one certificate satisfies the other. W1, 1084 / 1084, C90S / C98S and 2 more differ on one limit only — a carbon ceiling, an impact temperature or a strength minimum. 5160, O1, 52100 serve the same purpose without being the same steel, so a substitution there needs the design re-checked rather than the certificate. Across systems that is 1 in BS (superseded British), 2 in EN (European), 1 in JIS (Japan), 5 in AISI / SAE, 1 in GB/T (China), 1 in GOST (Russia/CIS).
Cross-reference table
| Grade | System | Match | Why / differences |
|---|---|---|---|
| CS100 | BS (superseded British) | Identical | BS 1449 CS100 carbon spring strip. |
| C100S | EN (European) | Identical | 1.1274 (EN 10132-4 spring strip): C 0.95–1.05, Mn 0.30–0.60, Si 0.15–0.35. |
| SK95 (SK4) | JIS (Japan) | Identical | JIS G4401 SK95: C 0.90–1.00, Mn 0.10–0.50 — the Japanese knife/saw grade; SK85 (SK5) is the 0.85 % C step. |
| W1 | AISI / SAE | Near | AISI W1 water-hardening tool steel at 0.95–1.05 % C is chemically the same, supplied to tool-steel cleanliness (ASTM A686). |
| 1084 / 1084 | AISI / SAE | Near | 0.84 % C: near-eutectoid, more forgiving heat treatment, slightly tougher — the beginner knifemaker's alternative. |
| C90S / C98S | EN (European) | Near | 1.1217 / 1.1233 — adjacent carbon steps in EN spring-strip grades. |
| T9A / T10A | GB/T (China) | Near | GB/T 1298 T10A: C 0.95–1.04, Mn ≤ 0.40 — Chinese carbon tool steel; T9A at 0.85–0.94. |
| U9A / U10A | GOST (Russia/CIS) | Near | GOST 1435 U10A: C 0.95–1.09, Mn 0.17–0.33 (tool steel); 65G/70S2A are the spring steels. |
| 5160 | AISI / SAE | Functional | 0.6 % C, 0.8 % Cr spring steel: far tougher, less edge retention — for swords, leaf springs and choppers. |
| O1 | AISI / SAE | Functional | Oil-hardening tool steel (1.2510): deeper hardening, better wear, easier quench — the tool-shop upgrade. |
| 52100 | AISI / SAE | Functional | Plain 0.95 % C: similar hardness, much lower hardenability, no chromium carbides — cheaper knife/spring alternative. |
Identical, near and functional are defined once on the grade index; the reason column below says which limit differs in each case.
1095 in BS (superseded British)
- CS100 — Identical BS 1449 CS100 carbon spring strip.
1095 in EN (European)
- C100S — Identical 1.1274 (EN 10132-4 spring strip): C 0.95–1.05, Mn 0.30–0.60, Si 0.15–0.35.
- C90S / C98S — Near 1.1217 / 1.1233 — adjacent carbon steps in EN spring-strip grades.
1095 in JIS (Japan)
- SK95 (SK4) — Identical JIS G4401 SK95: C 0.90–1.00, Mn 0.10–0.50 — the Japanese knife/saw grade; SK85 (SK5) is the 0.85 % C step.
1095 in AISI / SAE
- W1 — Near AISI W1 water-hardening tool steel at 0.95–1.05 % C is chemically the same, supplied to tool-steel cleanliness (ASTM A686).
- 1084 / 1084 — Near 0.84 % C: near-eutectoid, more forgiving heat treatment, slightly tougher — the beginner knifemaker's alternative.
- 5160 — Functional 0.6 % C, 0.8 % Cr spring steel: far tougher, less edge retention — for swords, leaf springs and choppers.
- O1 — Functional Oil-hardening tool steel (1.2510): deeper hardening, better wear, easier quench — the tool-shop upgrade.
- 52100 — Functional Plain 0.95 % C: similar hardness, much lower hardenability, no chromium carbides — cheaper knife/spring alternative.
1095 in GB/T (China)
- T9A / T10A — Near GB/T 1298 T10A: C 0.95–1.04, Mn ≤ 0.40 — Chinese carbon tool steel; T9A at 0.85–0.94.
1095 in GOST (Russia/CIS)
- U9A / U10A — Near GOST 1435 U10A: C 0.95–1.09, Mn 0.17–0.33 (tool steel); 65G/70S2A are the spring steels.
Superseded names for 1095
- C1095 — AISI (pre-1960s): Still printed on knife blanks and saw blades.
- G10950 — UNS
- CS95 / CS100 — BS 1449 (withdrawn): Carbon spring strip.
- Ck101 / C100S — DIN 17222 / EN 10132-4: Cold-rolled spring strip.
- SK4 / SK95 — JIS G4401: SK4 (old) = SK95 (2000+).
- W1 (near) — AISI tool steel: W1 (0.6–1.4 % C water-hardening tool steel) — the same steel with tool-steel quality control.
Key data for 1095
Full composition, mechanical properties by thickness, heat treatment and applications for 1095 →
Verified against ASTM A29/A29M-20 (SAE J403 chemistry). Last checked: September 2026.