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DIN 938 · 939 · 835 · 940 · ASME B18.31.2

Tap End Stud Bolts Manufacturer in India

One end screws into the tapped part and stays there; the other carries the nut. We make tap end stud bolts to DIN 938, 939, 835 and 940 and ASME B18.31.2, in classes 5.6 to 10.9, A193 B7 and stainless. Below: which metal end suits which material, full dimension tables, length rules, thread fits, the engagement each material needs and a stud finder.

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  • ISO 9001:2015 certified manufacturer
  • Metal end 1 d to 2.5 d
  • Sk6 transition-fit metal end
  • Inch and metric
Stainless steel tap end studs with plain shank
Metric M3 – M52 Inch 1/4 – 4 in Metal end 1–2.5 d
Overview

DIN 938, DIN 939 & DIN 835 Studs (Tap End Stud Bolts): Manufacturer & Exporter

A tap end stud has a short thread for a tapped hole, the metal end, a plain shank, and a longer thread for the nut. It is screwed into a housing, block or casing and left there, so the part on top can be removed and refitted without wearing the tapped thread.

Exotic Alloy manufactures tap end studs in Mumbai, India, for engine, pump, valve, gearbox and turbine builders and for maintenance teams. We supply across India and export to Azerbaijan, the Caspian region, the Gulf and Africa.

Tap end or double end?

A tap end stud has two different threads: a short metal end and a long nut end. Studs with a nut at both ends are on our double end page; threaded right through, see full threaded studs; with a thinner shank, see reduced shank.

DIN 938 / 939 DIN 835 / 940 ASME 1.5 d Sk6 / Sn4 / Fo 8.8 / 10.9 / B7
Tap end stud at a glance
Metric
DIN 938, 939, 835, 940; M3 to M52
Inch
ASME B18.31.2 tap-end stud, 1/4 to 4 in
Metal end
≈ 1 d, 1.25 d, 2 d, 2.5 d; ASME 1.5 d
Fit
Metal end Sk6 (or Sn4, Fo); nut end 6g
Length
DIN: without metal end; ASME: overall
Grades
5.6, 8.8, 10.9; A193 B7, B8M; stainless
Related
Double end, full threaded, nuts
DIN 938 tap end stud M16 by 60 drawn to scale: metal end b1 of 16 mm (about 1 d) with a short thread run-out x2 of 2.5 mm, plain shank, nut-end thread run-out x1 of 5 mm and nut-end thread b of 38 mm; nominal length l of 60 mm is measured from the end of the metal end to the nut end, so the stud is 76 mm long overall b1 16 b 38 (nut end) x2 x1 nominal length l = 60 overall 76 = b1 + l d plain shank ds ≈ d metal end, Sk6 nut end, 6g Designation Stud DIN 938 M16 × 60 Metal end b1 16 mm ≈ 1 d, into steel Nut end b 38 mm (l ≤ 125) Run-outs x1 5 · x2 2.5 mm DIN 938 tap end stud M16 × 60, to scale EXOTIC ALLOY
A DIN 938 M16 × 60 tap end stud, to scale. The nominal length l starts at the end of the metal end; with b1 = 16 mm the stud is 76 mm long. Thread run-outs x1 and x2 are the incomplete threads next to the shank.
Specification

Tap End Stud Specification

The range we manufacture and supply.

Metric standardsDIN 938 (≈ 1 d), DIN 939 (1.25 d), DIN 835 (2 d), DIN 940 (2.5 d)
Inch standardASME B18.31.2 tap-end stud, 1.5 d tap end
SizesM3–M52 (DIN 938), M4–M52 (939), M4–M24 (835, 940); 1/4–4 in
LengthsDIN commercial l 18–400 mm by size; inch to order
ThreadsMetal end Sk6, Sn4 or Fo; nut end 6g; fine pitch; UNC, UNF, 8UN
Grades5.6, 8.8, 10.9; ASTM A193 B7, B7M, B16, B8, B8M; A320 L7; A2 / A4-70
OptionsHex socket in the end, full or reduced body, special metal ends
FinishPlain, zinc plated, PTFE (fluoropolymer) coated
CertificationEN 10204 3.1; 3.2 on request
SupplyStuds alone or with nuts and washers
Metal ends

DIN 938, 939, 835, 940 & ASME: Which Metal End for Which Material

The softer the tapped part, the longer the metal end.

Metal ends of five tap end studs at the same scale, screwed into a tapped part: DIN 938 16 mm (about 1 d, for steel), DIN 939 20 mm (1.25 d, cast iron), ASME B18.31.2 5/8 inch 0.938 inch or 23.8 mm (1.5 d), DIN 835 32 mm (2 d, aluminium alloys) and DIN 940 40 mm (2.5 d, light metals of low strength) tapped part (section) 16 mm DIN 938 ≈ 1 d · steel 20 mm DIN 939 ≈ 1.25 d · cast iron 23.8 mm ASME B18.31.2 1.5 d · 5/8-11 UNC 32 mm DIN 835 ≈ 2 d · aluminium alloys 40 mm DIN 940 ≈ 2.5 d · soft light metals tapped surface M16 and 5/8 in, same scale; hole drawn 3 pitches deeper than the metal end EXOTIC ALLOY
Five metal ends at the same scale, M16 and 5/8 in. From 16 mm (DIN 938) to 40 mm (DIN 940); the ASME tap end is 1.5 d.
StandardMetal endIntended tapped materialSizesClasses
DIN 938≈ 1 dSteelM3–M525.6, 8.8, 10.9 (M3–M39)
DIN 939≈ 1.25 dCast ironM4–M52Steel to ISO 898-1, class to order
ASME B18.31.21.5 dNot specified1/4–4 inASTM A193, A320 and other grades
DIN 835≈ 2 dAluminium alloysM4–M245.6, 8.8, 10.9
DIN 940≈ 2.5 dLight metals of low strengthM4–M245.6, 8.8

The intended materials are those named in the scope of each DIN standard. Fine-pitch threads from M8 × 1; other classes and stainless steel by agreement.

Dimensions

Tap End Stud Dimensions

SizePitch P
coarse / fine		Metal end b1Nut end b
l ≤ 125 / ≤ 200 / > 200		Run-out x1 / x2Lengths l
M30.5 / –312 / 18 / –1.25 / 0.718–30
M40.7 / –414 / 20 / –1.75 / 0.920–40
M50.8 / –516 / 22 / –2 / 122–50
M61 / –618 / 24 / –2.5 / 1.2525–60
(M7)1 / –720 / 26 / –2.5 / 1.2528–70
M81.25 / 1822 / 28 / –3.2 / 1.630–80
M101.5 / 1.251026 / 32 / 453.8 / 1.935–100
M121.75 / 1.51230 / 36 / 494.3 / 2.240–120
(M14)2 / 1.51434 / 40 / 535 / 2.545–140
M162 / 1.51638 / 44 / 575 / 2.550–160
(M18)2.5 / 1.51842 / 48 / 616.3 / 3.255–180
M202.5 / 1.52046 / 52 / 656.3 / 3.260–200
(M22)2.5 / 1.52250 / 56 / 696.3 / 3.265–200
M243 / 22454 / 60 / 737.5 / 3.870–200
(M27)3 / 22560 / 66 / 797.5 / 3.8–
M303.5 / 23066 / 72 / 859 / 4.5–
(M33)3.5 / 23272 / 78 / 919 / 4.5–
M364 / 33578 / 84 / 9710 / 5–
(M39)4 / 33884 / 90 / 10310 / 5–
M424.5 / 34290 / 96 / 10911 / 5.5–
(M45)4.5 / 34596 / 102 / 11511 / 5.5–
M485 / 348102 / 108 / 12112.5 / 6.3–
(M52)5 / 352110 / 116 / 12912.5 / 6.3–

DIN 938:2012, mm. M27 b1 is 25 mm in the standard. x2 for M4–M6 is given as 0.9 / 1 / 1.25 mm, as in the 1995 edition and the 1.25 P short run-out; copies of the 2012 table show this row shifted by one size. Commercial lengths listed to M24.

SizePitch P
coarse / fine		Metal end b1Nut end b
l ≤ 125 / ≤ 200 / > 200		Run-out x1 / x2Lengths l
M40.7 / –514 / 20 / –1.75 / 0.920–40
M50.8 / –6.516 / 22 / –2 / 122–50
M61 / –7.518 / 24 / –2.5 / 1.2525–60
(M7)1 / –920 / 26 / –2.5 / 1.2528–70
M81.25 / 11022 / 28 / –3.2 / 1.630–80
M101.5 / 1.251226 / 32 / 453.8 / 1.935–100
M121.75 / 1.25, 1.51530 / 36 / 494.3 / 2.240–120
(M14)2 / 1.51834 / 40 / 535 / 2.545–140
M162 / 1.52038 / 44 / 575 / 2.550–160
(M18)2.5 / 1.52242 / 48 / 616.3 / 3.255–180
M202.5 / 1.52546 / 52 / 656.3 / 3.260–200
(M22)2.5 / 1.52850 / 56 / 696.3 / 3.265–200
M243 / 23054 / 60 / 737.5 / 3.870–200
(M27)3 / 23560 / 66 / 797.5 / 3.875–280
M303.5 / 23866 / 72 / 859 / 4.585–300
(M33)3.5 / 24272 / 78 / 919 / 4.590–340
M364 / 34578 / 84 / 9710 / 5100–360
(M39)4 / 35084 / 90 / 10310 / 5110–400
M424.5 / 35290 / 96 / 10911 / 5.5120–400
(M45)4.5 / 35896 / 102 / 11511 / 5.5120–400
M485 / 360102 / 108 / 12112.5 / 6.3130–400
(M52)5 / 365110 / 116 / 12912.5 / 6.3140–400

DIN 939:2025, mm.

SizePitch P
coarse / fine		Metal end b1Nut end b
l ≤ 125 / ≤ 200 / > 200		Run-out xLengths l
M40.7 / –814 / 20 / –1.7520–40
M50.8 / –1016 / 22 / –222–50
M61 / –1218 / 24 / –2.525–60
(M7)1 / –1420 / 26 / –2.528–70
M81.25 / 11622 / 28 / –3.230–80
M101.5 / 1.252026 / 32 / 453.835–100
M121.75 / 1.25, 1.52430 / 36 / 494.340–120
(M14)2 / 1.52834 / 40 / 53545–140
M162 / 1.53238 / 44 / 57550–160
(M18)2.5 / 1.53642 / 48 / 616.355–180
M202.5 / 1.54046 / 52 / 656.360–200
(M22)2.5 / 1.54450 / 56 / 696.365–200
M243 / 24854 / 60 / 737.570–200

DIN 835:2025, mm.

SizePitch P
coarse / fine		Metal end b1Nut end b
l ≤ 125 / ≤ 200 / > 200		Run-out xLengths l
M40.7 / –1014 / 20 / –1.7520–40
M50.8 / –1316 / 22 / –222–50
M61 / –1518 / 24 / –2.525–60
(M7)1 / –1820 / 26 / –2.528–70
M81.25 / 12022 / 28 / –3.230–80
M101.5 / 1.252526 / 32 / 453.835–100
M121.75 / 1.25, 1.53030 / 36 / 494.340–120
(M14)2 / 1.53534 / 40 / 53545–140
M162 / 1.54038 / 44 / 57550–160
(M18)2.5 / 1.54542 / 48 / 616.355–180
M202.5 / 1.55046 / 52 / 656.360–200
(M22)2.5 / 1.55550 / 56 / 696.365–200
M243 / 26054 / 60 / 737.570–200

DIN 940:2010, mm.

SizeTap end BM
nom. (min–max), in		U max
UNC / UNF / 8UN		Nut end B min
LT ≤ 10 / ≤ 16 / > 16		Body ds min
UNC, in
1/4 in.375 (.350–.400).100 / .071 / –3/4 / 1 / 1-1/2.241
5/16 in.469 (.440–.498).111 / .083 / –7/8 / 1-1/8 / 1-5/8.303
3/8 in.563 (.532–.594).125 / .083 / –1 / 1-1/4 / 1-3/4.364
7/16 in.656 (.620–.692).143 / .100 / –1-1/8 / 1-3/8 / 1-7/8.426
1/2 in.750 (.708–.792).154 / .100 / –1-1/4 / 1-1/2 / 2.488
9/16 in.844 (.802–.896).167 / .111 / –1-3/8 / 1-5/8 / 2-1/8.550
5/8 in.938 (.892–.983).182 / .111 / –1-1/2 / 1-3/4 / 2-1/4.611
3/4 in1.125 (1.075–1.175).200 / .125 / –1-3/4 / 2 / 2-1/2.735
7/8 in1.313 (1.258–1.368).222 / .143 / –2 / 2-1/4 / 2-3/4.859
1 in1.500 (1.438–1.562).250 / .167 / –2-1/4 / 2-1/2 / 3.983
1-1/8 in1.688 (1.625–1.750).286 / .167 / .2502-1/2 / 2-3/4 / 3-1/41.106
1-1/4 in1.875 (1.813–1.938).286 / .167 / .2502-3/4 / 3 / 3-1/21.231
1-3/8 in2.063 (2.000–2.125).333 / .167 / .2503 / 3-1/4 / 3-3/41.354
1-1/2 in2.250 (2.188–2.313).333 / .167 / .2503-1/4 / 3-1/2 / 41.479
1-5/8 in2.438 (2.375–2.500)– / – / .2503-1/2 / 3-3/4 / 4-1/4–
1-3/4 in2.625 (2.563–2.688).400 / – / .2503-3/4 / 4 / 4-1/21.727
1-7/8 in2.813 (2.750–2.875)– / – / .2504 / 4-1/4 / 4-3/4–
2 in3.000 (2.925–3.075).444 / – / .2504-1/4 / 4-1/2 / 51.975
2-1/4 in3.375 (3.300–3.450).444 / – / .2504-3/4 / 5 / 5-1/22.225
2-1/2 in3.750 (3.675–3.825).500 / – / .2505-1/4 / 5-1/2 / 62.473
2-3/4 in4.125 (4.050–4.200).500 / – / .2505-3/4 / 6 / 6-1/22.723
3 in4.500 (4.425–4.575).500 / – / .250– / 6-1/2 / 72.973
3-1/4 in4.875 (4.775–4.975).500 / – / .250– / 7 / 7-1/23.223
3-1/2 in5.250 (5.150–5.350).500 / – / .250– / 7-1/2 / 83.473
3-3/4 in5.625 (5.525–5.725).500 / – / .250– / 8 / 8-1/23.723
4 in6.000 (5.900–6.100).500 / – / .250– / 8-1/2 / 93.973

ASME B18.31.2-2014 tap-end studs (1.5 d engagement), inch. BM: tap end full thread length, measured from the end; U: chamfer to the first full thread, 1 to 2 pitches; B: full nut-end thread by overall length LT. Reduced-body studs have a smaller shank.

DIN: b1 metal end, b nut-end thread for l ≤ 125 / 125–200 / > 200 mm, x1 and x2 thread run-outs; plain shank ds ≈ d (tolerance h13). Sizes in brackets are second choice. Ends chamfered.

Length & fit

How Tap End Stud Length Is Given & Metal End Fits

How tap end stud length is given, two studs of almost the same size at the same scale: DIN 938 M16 by 60, where the nominal length l of 60 mm excludes the 16 mm metal end, so the stud is 76 mm long; and ASME B18.31.2 5/8 inch by 3 inch, where L T of 3 inches (76.2 mm) is the overall length and the standoff S, 2.062 inches, is L T minus the tap end B M of 0.938 inch b1 16 l = 60 (nominal) DIN 938 M16 × 60 overall 76 mm l excludes the metal end BM 0.938 standoff S = 2.062 (ref.) LT = 3 in (nominal) = overall 76.2 mm ASME B18.31.2 5/8-11 × 3 overall 3 in Lₜ includes the tap end EXOTIC ALLOY
Two studs of almost the same size, two different nominal lengths. DIN 938 M16 × 60 and ASME 5/8 × 3 in are both about 76 mm long overall.
  • DIN: l is the length outside the tapped part, from the end of b1.
  • ASME: LT is overall; standoff S = LT − BM.
  • Sk6 metal end: the stud stays put when the nut is undone.
  • Fo: order it when the stud must come out easily.
ThreadToleranceEffect
Metal end, standardSk6 (DIN 13-51)Transition fit, tighter than 6g
Metal end, optionSn4Medium fit, similar to 6g
Metal end, “Fo”No transition fitFree running in the hole
Nut end6gNormal fit with the nut

DIN tap end studs, as described in the DIN 938 to 940 product data; ends chamfered to DIN 78.

Engagement

How Much Metal End Does Each Material Need?

Minimum thread engagement for an M16 class 8.8 stud to break before the tapped thread strips, by tapped material, against the metal-end lengths of the standards: about 0.60 d in quenched and tempered C45 steel, 0.76 d in S355, 0.89 d in ductile iron GJS-400, 0.99 d in S235 and 1.37 d in 6061-T6 aluminium; DIN 938 gives 1 d, DIN 939 1.25 d, ASME 1.5 d, DIN 835 2 d and DIN 940 2.5 d M16 class 8.8: minimum engagement before the tapped thread strips, × d DIN 938 DIN 939 ASME DIN 835 DIN 940 0 d 0.5 d 1 d 1.5 d 2 d 2.5 d C45 steel, quenched and tempered: 0.60 d (9.6 mm) for M16 class 8.8 C45 steel, quenched & tempered 0.60 d S355 steel: 0.76 d (12.2 mm) for M16 class 8.8 S355 steel 0.76 d Ductile iron EN-GJS-400: 0.89 d (14.3 mm) for M16 class 8.8 Ductile iron EN-GJS-400 0.89 d S235 steel: 0.99 d (15.9 mm) for M16 class 8.8 S235 steel 0.99 d Aluminium 6061-T6: 1.37 d (22.0 mm) for M16 class 8.8 Aluminium 6061-T6 1.37 d Our calculation: basic-dimension shear areas, shear strength = 0.5 × tensile, no safety factor; grey cast iron is not covered by this method. EXOTIC ALLOY
The engagement at which the stud breaks before the tapped thread strips. In S235 the DIN 938 metal end just holds; aluminium needs DIN 835. Hover a bar for the length in mm.
Size, class 8.8C45 steel, quenched & tempered
650 MPa		S355 steel
470 MPa		Ductile iron EN-GJS-400
400 MPa		S235 steel
360 MPa		Aluminium 6061-T6
260 MPa
M80.58 d0.71 d0.83 d0.92 d1.28 d
M100.59 d0.72 d0.84 d0.94 d1.30 d
M120.59 d0.72 d0.85 d0.95 d1.31 d
M160.60 d0.76 d0.89 d0.99 d1.37 d
M200.60 d0.79 d0.92 d1.03 d1.42 d
M240.60 d0.79 d0.93 d1.03 d1.42 d

Our calculation: Machinery’s Handbook shear areas with basic thread dimensions (external 0.75 π D1, internal 0.875 π d per unit length), shear strength 0.5 × tensile, class 8.8 stud (800 MPa to M16, 830 MPa above), minimum tensile strength of the tapped material. No safety factor; the DIN lengths add margin for tolerances, heat and repeated assembly. Grey cast iron (DIN 939) does not follow the 0.5 × tensile shear rule and is not calculated.

Finder

Tap End Stud Finder: Metal End, Length & Hole

Check the metal end against the tapped material, then find the length.

Stud & joint

Our calculation. Tapped part: its minimum tensile strength Rm (enter any value under Other). Part = thickness of the part clamped onto the tapped face; washer under the nut (0 if none); stick-out beyond the nut, in pitches. Nut: ISO 4032 (metric) or ASME heavy hex (inch), maximum height. DIN length l = part + washer + nut + stick-out, rounded up to the next commercial length; ASME LT = tap end BM + the same, rounded up to 1/4 in (our step). Engagement by the shear-area method of section 06, compared with b1 (DIN) or BM min (ASME).

Result
50
mm length l
0.99
× d needed; metal end 1 d
Metal end / needed:16 / 15.9 mm
Length needed:41.8 mm
Stick-out at this length:12.2 mm (6.1 P)
Thread left under the nut:11 mm
Tapped hole:thread ≥ 16 mm, drill 14 mm
Min. tensile load:125.6 kN
Mass each (steel):91 g
Designation:Stud DIN 938 M16 × 50, 8.8

Materials

Tap End Stud Materials & Coatings

MaterialGradesFinishWhere
Carbon and alloy steelISO 898-1 5.6, 8.8, 10.9Plain, zinc platedEngines, gearboxes, machinery
Cr-Mo alloy steel (4140 type)ASTM A193 B7, B7M; A320 L7Plain, PTFE coatedValve bodies, pumps, pressure equipment
Cr-Mo-V alloy steelASTM A193 B16PlainTurbine and high-temperature casings
Stainless 304 / 316A2-70, A4-70; A193 B8, B8MPlainFood, chemical and marine equipment, as in the photo
Nickel alloysInconel 718, A-286PlainHot sections and subsea equipment
Alloy steel
8.8 · 10.9 · B7

Engine and pressure-equipment studs.

41404340
Stainless
A2 · A4 · B8M

As in the photo.

304316
Nickel alloys
718 · A-286

Heat and corrosion.

Inconel 718A-286
Manufacturing

How Our Tap End Studs Are Made

1

Bar

Certified bar, heat treated for the class.

2

Cut & turn

Cut to length, ends chamfered.

3

Metal end

Thread rolled to Sk6, Sn4 or 6g (Fo).

4

Nut end

Thread rolled to 6g; shank left plain.

5

Drive

Hex socket in the end, if ordered.

6

Finish

Coating, marking and packing.

Applications

Where Our Tap End Studs Are Used

Engines

Cylinder heads, manifolds and covers on blocks.

Pumps & valves

Covers and bonnets on cast bodies.

Gearboxes

Housings and inspection covers.

Turbines & compressors

Split casings and nozzle flanges.

Pressure equipment

Studded nozzles and blind tapped flanges.

Aluminium housings

Long metal ends to DIN 835 and 940.

Quality & testing

Tap End Stud Inspection & Certification

CheckMethodApplied to
Metal-end threadRing gauges for Sk6, Sn4 or 6gEvery lot
Nut-end thread6g GO / NOT GO ring gaugesEvery lot
b1, b, lCallipers, height gaugeEvery lot
Shank diameterMicrometerEvery lot
Hardness, tensileTo ISO 898-1 or ASTMEvery heat-treat lot
MaterialPMI / chemical analysisStainless and alloys

Every shipment includes

  • EN 10204 3.1 certificate with heat number
  • Dimensional and thread gauge report
  • Lot number on every box

On request

  • EN 10204 3.2 with third-party inspection
  • Impact tests for A320 grades
  • PMI and coating reports
FAQ

Tap End Stud Questions, Answered

A stud with a short thread at one end, the metal end, which is screwed into a tapped hole and stays there, a plain shank, and a longer thread at the other end for the nut. DIN 938, 939, 835 and 940 differ in the length of the metal end, about 1 d, 1.25 d, 2 d and 2.5 d; ASME B18.31.2 tap-end studs have a 1.5 d tap end.

The DIN standards name the intended material: DIN 938 (about 1 d) mainly for steel, DIN 939 (1.25 d) for cast iron, DIN 835 (2 d) for aluminium alloys and DIN 940 (2.5 d) for light metals of low strength. A softer tapped material needs a longer engagement before its thread holds the full strength of the stud.

On DIN studs the nominal length l is measured from the end of the metal end to the nut end, so a DIN 938 M16 x 60 stud is 76 mm long overall. On ASME B18.31.2 tap-end studs the nominal length is the overall length; the standoff above the tapped part is that length minus the tap end length.

They describe the thread tolerance of the metal end. Sk6 (DIN 13-51) is a transition fit, tighter than the usual 6g, so the stud stays in the hole when the nut is undone. Sn4 is a medium fit similar to 6g, and Fo in the designation means no transition fit. The nut end is 6g.

The full thread in the hole must be at least as deep as the metal end, b1 on DIN studs or the tap end length on ASME studs, and the drilled hole deeper again for the tap's lead and run-out. Our finder gives the thread depth and the tap drill.

By the shear-area method an M16 class 8.8 stud needs about 0.99 d of engagement in S235 steel for the stud to break before the tapped thread strips; DIN 938 gives 1 d, so it just holds. In 6061-T6 aluminium the same stud needs about 1.37 d, which DIN 835 with 2 d covers.

DIN 938 and DIN 835 list property classes 5.6, 8.8 and 10.9, DIN 940 lists 5.6 and 8.8. Inch tap-end studs are made in ASTM A193 B7, B7M, B16, B8 and B8M and ASTM A320 L7. Stainless A2-70 and A4-70 studs, like those in our photo, are made by agreement.

The metal end is screwed fully into the tapped hole with a stud driver, with two nuts locked against each other on the nut end, or with a hex key in a socket in the end of the stud, as on the studs in our photo. The part is then placed over the stud and clamped with a nut.
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