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DIN 938 Double-End Studs (Metal End ≈ 1 d)

Double-end metric studs to DIN 938 — the metal (screwed-in) end at approximately 1 × thread diameter, nut-end thread length tabulated by grip L through (M52), with the collected pitch/shank-diameter/thread-run-out ladder M3 to (M52).

Last updated: 2026-11

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DIN 938 Double-End Studs (Metal End ≈ 1 d) in an industrial setting
Illustrative image redrawn from real product references — not a photograph of stocked items.

Specifications

DIN 938 is the shortest-engagement member of the classic double-end stud trio: the screwed-in end is sized at roughly one thread diameter — the tabulated b 1 row runs 3 mm at M3 up to 52 mm at (M52) — so it suits tapped holes in reasonably thick, sound material where a longer bite would bottom out or overload the thread. The nut end carries the standard engagement ladders by grip length (L≤125 / 125＜L≤200 / L＞200 rows), which is what the assembler reads when choosing the tapped-hole depth versus the nut thread run. The collected ladder spans M3 to (M52), with fine-thread pitch rows printed where the standard tabulates them and "-" where a size has no fine-thread or long-grip variant in the source. Pair the stud with a class-matched nut off this catalog's metric hex nut line and thread it into the tapping-size hole your drawing calls. Material, property class and finish are not printed by the collected specification — per RFQ (name the class and coating at quotation).

Standard DIN 938 — double-end studs, metal (screwed-in) end ≈ 1 d
Size range M3 – (M52), parenthesised sizes non-preferred per the source notation
Screwed-in end b 1: 3 – 52 mm across the ladder (≈ 1 × d)
Nut-end engagement b by grip: L≤125 / 125＜L≤200 / L＞200 rows per size (12 → 129 mm)
Shank diameter d s: min/max per size (e.g. M10: 9.78 – 10 mm)
Thread variants Coarse pitch tabulated per size; fine-thread rows where the source tabulates them
Material / property class Not tabulated by the collected specification — per RFQ
DIN 938 double-end studs, metal end ≈ 1 d - attribute rows per size (M3 - (M14))All dimensions in millimetres. Attribute labels follow the source: P = pitch (coarse and fine thread variants); b 1 = metal (screwed-in) end length; b = nut-end thread length by grip L; d s = stud (shank) diameter; x 1 / x 2 = thread run-out. Parenthesised sizes are the source's own non-preferred notation. The source prints no material or property-class columns — per RFQ.
AttributeM3M4M5
P — Pitch — Coarse thread0.50.70.8
P — Pitch — Fine thread-1---
P — Pitch — Fine thread-2---
b 1345
b — L≤125121416
b — 125＜L≤200182022
b — L＞200---
d s — max345
d s — min2.863.824.82
x 11.251.752
x 20.70.70.9
  • Row 7 (b — L＞200): The source prints "-" (no tabulated value) for the L＞200 nut-end engagement on M3-M5 — carried verbatim, not read across from larger sizes.
DIN 938 double-end studs, metal end ≈ 1 d - attribute rows per size (M6 - M8)All dimensions in millimetres; labels and reading order as the first table. Parenthesised (M7) is the source's non-preferred notation.
AttributeM6(M7)M8
P — Pitch — Coarse thread111.25
P — Pitch — Fine thread-1--1
P — Pitch — Fine thread-2---
b 1678
b — L≤125182022
b — 125＜L≤200242628
b — L＞200---
d s — max678
d s — min5.826.787.78
x 12.52.53.2
x 211.251.6
DIN 938 double-end studs, metal end ≈ 1 d - attribute rows per size (M10 - (M14))All dimensions in millimetres; labels and reading order as the first table.
AttributeM10M12(M14)
P — Pitch — Coarse thread1.51.752
P — Pitch — Fine thread-11.251.251.5
P — Pitch — Fine thread-2-1.5-
b 1101214
b — L≤125263034
b — 125＜L≤200323640
b — L＞200454953
d s — max101214
d s — min9.7811.7313.73
x 13.84.35
x 21.92.22.5
DIN 938 double-end studs, metal end ≈ 1 d - attribute rows per size (M16 - M20)All dimensions in millimetres; labels and reading order as the first table.
AttributeM16(M18)M20
P — Pitch — Coarse thread22.52.5
P — Pitch — Fine thread-11.51.51.5
P — Pitch — Fine thread-2---
b 1161820
b — L≤125384246
b — 125＜L≤200444852
b — L＞200576165
d s — max161820
d s — min15.7317.7319.67
x 156.36.3
x 22.53.23.2
DIN 938 double-end studs, metal end ≈ 1 d - attribute rows per size ((M22) - (M27))All dimensions in millimetres; labels and reading order as the first table.
Attribute(M22)M24(M27)
P — Pitch — Coarse thread2.533
P — Pitch — Fine thread-11.522
P — Pitch — Fine thread-2---
b 1222425
b — L≤125505460
b — 125＜L≤200566066
b — L＞200697379
d s — max222427
d s — min21.6723.6726.67
x 16.37.57.5
x 23.23.83.8
DIN 938 double-end studs, metal end ≈ 1 d - attribute rows per size (M30 - M36)All dimensions in millimetres; labels and reading order as the first table.
AttributeM30(M33)M36
P — Pitch — Coarse thread3.53.54
P — Pitch — Fine thread-1223
P — Pitch — Fine thread-2---
b 1303235
b — L≤125667278
b — 125＜L≤200727884
b — L＞200859197
d s — max303336
d s — min29.6732.6135.61
x 19910
x 24.54.55
DIN 938 double-end studs, metal end ≈ 1 d - attribute rows per size ((M39) - (M45))All dimensions in millimetres; labels and reading order as the first table.
Attribute(M39)M42(M45)
P — Pitch — Coarse thread44.54.5
P — Pitch — Fine thread-1333
P — Pitch — Fine thread-2---
b 1384245
b — L≤125849096
b — 125＜L≤2009096102
b — L＞200103109115
d s — max394245
d s — min39.6141.6144.61
x 1101111
x 255.55.5
  • Row 9 (d s — min): The source prints the (M39) d s min as 39.61 — above the nominal diameter, while the neighbouring sizes follow the nominal-minus-deviation ladder (41.61 at M42, 44.61 at M45). Carried verbatim from the collected page and not normalized; verify against DIN 938 itself before using this cell.
DIN 938 double-end studs, metal end ≈ 1 d - attribute rows per size (M48 - (M52))All dimensions in millimetres; labels and reading order as the first table.
AttributeM48(M52)
P — Pitch — Coarse thread55
P — Pitch — Fine thread-133
P — Pitch — Fine thread-2--
b 14852
b — L≤125102110
b — 125＜L≤200108116
b — L＞200121129
d s — max4852
d s — min47.6151.54
x 112.512.5
x 26.36.3

Materials

  • Material and property class specified per RFQ — studs are typically produced in carbon steel classes and stainless to match the mating nut; state the class (e.g. 8.8 / A2-70) and coating at quotation

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 (DIN 938 Double-End Studs (Metal End ≈ 1 d)) 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 1,000–10,000 pieces depending on size. Stock items run 3–7 days. High-strength and custom parts run 15–25 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

DIN 938, DIN 939 or DIN 835 — which screwed-in length do I need?

By the tapped hole, not the nut. The three designations differ in the metal end: ≈ 1 d (DIN 938), ≈ 1.25 d (DIN 939) and ≈ 2 d (DIN 835). A short engagement suits strong, deep threads in steel; the longer ends buy thread shear area in softer housings — aluminium, cast iron, shallow or repaired taps — where more engaged turns carry the clamp. Compare the b 1 rows across the three ladders in this catalog (at M12: 12 / 15 / 24 mm) and match your drawing's tapped-hole depth. All three share the same nut-end engagement ladders by grip, so the nut side of the RFQ reads identically.

Related knowledge

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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

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