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DIN 931 HEX BOLT — Size Navigator

Deterministic evaluation of fastener standards based on geometry, material, and compliance constraints. Complete engineering specifications across all 153 size/grade/finish variants.

DIN 931 Hex Bolt Dimensions

Partially threaded hexagon head bolts, metric coarse thread. Nominal dimensions for width across flats (s) and head height (k) across 17 metric sizes. Values in millimetres.

Size	Width Across Flats (s)	Head Height (k)
M6	10	4
M8	13	5.3
M10	16	6.4
M12	18	7.5
M14	21	8.8
M16	24	10
M18	27	11.5
M20	30	12.5
M22	34	14
M24	36	15
M27	41	17
M30	46	18.7
M36	55	22.5
M42	65	26
M48	75	30
M56	85	35
M64	95	40

Equivalent Standards

DIN 931 is dimensionally cross-referenced with the following standards:

EN ISO 4014
CSN 21101
PN 82101
UNI 5737
EU 24014

Select Size & Grade

Standard

Diameter

Material Grade

Compatibility Result

INSTALLABLE

No constraint violation detected.

Risk Level

0.12

Low structural risk

Evaluation Steps

/standards/din-931/

Canonical equivalence resolved

📋 [EVALUATION LOG]

INPUT → STANDARD: DIN 931 | SIZE: M12 | GRADE: 8.8

✓ STEP 1 → Geometry validation: PASS

✓ STEP 2 → Thread compatibility: PASS

✓ STEP 3 → Load constraint: PASS

ℹ STEP 4 → ISO mapping check: MATCH

✓ RESULT → INSTALLABLE (score 0.12)

📋 Standard Information

Standard DIN 931

Category BOLTS

Type BOLT

Total Specs 153

Available Sizes 17

Material Grades 10.9, 12.9, 5.6, 5.8, 8.8, A2-70, A4-70

Surface Finishes Plain, Stainless Steel

🔗 Cross-Standard Equivalence

Standard	Name	Status	Risk Note
DIN 931, ISO 4014, DIN 933, ISO 4017, ASME B18.2.1, ISO 4032, ISO 7089, DIN 934, DIN 125-A, ASME B18.2.2, DIN 912, ISO 4762	Equivalent standards in cluster	IN CLUSTER	—

Related Standard	Relationship	Confidence
ISO 4014	Equivalent	0.98
DIN 933	Variant	0.85

🧭 Browse by Topic

DIN 931 in the concept layer — Fastener Knowledge:

Bolts — Bolt types, thread variants and the standards that define them.
Metric Fasteners — Metric designation, thread class and DIN / ISO equivalents.

📏 Size Navigator

Select a size to view its complete engineering data — including dimensional tolerances, material grades, mechanical properties, and surface finish options.

M6 9 variants → M7 1 variants → M8 9 variants → M10 9 variants → M12 9 variants → M14 9 variants → M16 9 variants → M18 9 variants → M20 9 variants → M22 9 variants → M24 9 variants → M27 9 variants → M30 9 variants → M33 1 variants → M36 9 variants → M39 1 variants → M42 9 variants → M45 1 variants → M48 9 variants → M52 1 variants → M56 9 variants → M60 1 variants → M64 9 variants →

🔄 Standard Redirect Map

Non-canonical standard paths are automatically redirected to their canonical ISO equivalents via the Engineering Data Authority Lock. Equivalent standards: DIN 931, ISO 4014, DIN 933, ISO 4017, ASME B18.2.1, ISO 4032, ISO 7089, DIN 934, DIN 125-A, ASME B18.2.2, DIN 912, ISO 4762

Source (Non-Canonical)	Target (Canonical Route)
/iso-4014/	/standards/din-931/
/din-933/	/standards/din-931/

                CEV-1 HASH: 8bff5951ec3b1c8112b9c0fcd411ca710111f0f509ff3ee220df8f23815f00f7
                FROZEN: 2026-08-17 20:13:55
                ASSET: standard_map_core.csv
                CLUSTER: [DIN 931, ISO 4014, DIN 933, ISO 4017, ASME B18.2.1, ISO 4032, ISO 7089, DIN 934, DIN 125-A, ASME B18.2.2, DIN 912, ISO 4762]
            
✓ CEV-1 Verified

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DIN 931 Partial Thread Hexagon Head Bolt per DIN 931 specification, available in A4-70 grade with Stainless Steel finish. Engineered for industrial OEM applications requiring 700.0 MPa tensile strength and reliable long-term fastening performance.

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