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marcusBMG
Joined: 07 Dec 2012
Posts: 1387
Location: Conwy N Wales
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 Posted: Tue Aug 12, 2025 9:51 pm Post subject: Anyone got any M1.8 thread (0.35mm pitch) csk bolts? |
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Posted: Tue Aug 12, 2025 9:51 pm Post subject: Anyone got any M1.8 thread (0.35mm pitch) csk bolts? |
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marcusBMG wrote:
For some reason these just aren't around - everyone lists M1.6 and M2. Don't have to be JIS. Approx 7-10mm lengths . Please msg me...
_________________
pentax ME super (retired)
Pentax K3-ii; pentax K-S2; Samsung NX 20; Lumix G1 + adapters;
Adaptall collection (proliferating!) inc 200-500mm 31A, 300mm f2.8, 400mm f4.
Primes: takumar 55mm; smc 28mm, 50mm; kino/komine 28mm f2's, helios 58mm, Tamron Nestar 400mm, novoflex 400mm, Vivitar 135mm close focus, 105mm macro; Jupiter 11A; CZJ 135mm.
A classic zoom or two: VS1 (komine), Kiron Zoomlock... |
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visualopsins
Joined: 05 Mar 2009
Posts: 11638
Location: California
Expire: 2027-07-11
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Posted: Tue Aug 12, 2025 11:00 pm Post subject: |
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Posted: Tue Aug 12, 2025 11:00 pm Post subject: |
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visualopsins wrote:
DIY? Burkit M1.8 X 0.35 Tap and Die Set, M1.8 x 0.35 Machine Thread Tap and Round Die Right Hand https://www.amazon.com/Burkit-Machine-Thread-Round-Right/dp/B09ZTT736L
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Solinon 1:5.6/18 ASPH.
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
Last edited by visualopsins on Sun Aug 17, 2025 8:26 pm; edited 1 time in total |
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marcusBMG
Joined: 07 Dec 2012
Posts: 1387
Location: Conwy N Wales
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Posted: Sat Aug 16, 2025 12:22 pm Post subject: |
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Posted: Sat Aug 16, 2025 12:22 pm Post subject: |
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marcusBMG wrote:
Thx for response visualopsins
Nobody seems to be able to supply M1.8's. I have a lens with missng bolt, and a diy'ed adapter* that I mistakenly tapped M1.8 only to realise that my 8mm bolts are M1.6. they fit but they're loose. My engineering friend suggested a bit of fine filler to fill out the hole, I may try that.
I've ordered a very cheap die from china....I'll try filing down M2.5's to 1.8mmm and threading them.
*My pentacon 500mm is now an adaptall 
_________________
pentax ME super (retired)
Pentax K3-ii; pentax K-S2; Samsung NX 20; Lumix G1 + adapters;
Adaptall collection (proliferating!) inc 200-500mm 31A, 300mm f2.8, 400mm f4.
Primes: takumar 55mm; smc 28mm, 50mm; kino/komine 28mm f2's, helios 58mm, Tamron Nestar 400mm, novoflex 400mm, Vivitar 135mm close focus, 105mm macro; Jupiter 11A; CZJ 135mm.
A classic zoom or two: VS1 (komine), Kiron Zoomlock...
Last edited by marcusBMG on Mon Aug 25, 2025 11:57 am; edited 1 time in total |
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visualopsins
Joined: 05 Mar 2009
Posts: 11638
Location: California
Expire: 2027-07-11
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Posted: Sat Aug 16, 2025 1:15 pm Post subject: |
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Posted: Sat Aug 16, 2025 1:15 pm Post subject: |
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visualopsins wrote:
 Awesome! That looks really cool...
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Solinon 1:5.6/18 ASPH.
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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kansalliskala
Joined: 19 Jul 2007
Posts: 5117
Location: Southern Finland countryside
Expire: 2016-12-30
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Posted: Sun Aug 17, 2025 4:58 am Post subject: |
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Posted: Sun Aug 17, 2025 4:58 am Post subject: |
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kansalliskala wrote:
| visualopsins wrote: |
| DIY? Burkit M1.8 X 0.35 Tap and Die Set, M1.8 x 0.35 Machine Thread Tap and Round Die Right Hand |
diy 1,8 mm screws 
_________________
MF: Kodak DCS SLR/c; Samsung NX10; OM-10; Canon T50
Zuiko 28/3.5, Distagon 35/2.8; Yashica ML 50/2;
Zuiko 50/1.4; S-M-C 120/2.8; Zuiko 135/3.5; 200/5;
Tamron AD1 135/2.8, Soligor 180/3.5; Tamron AD1 300/5.6
Tamron zooms: 01A, Z-210
Yashicaflex C; Київ 4 + Юпитер 8, 11; Polaroid 100; Olympus XA; Yashica T3
Museum stuff: Certo-Phot; Tele-Edixon 135; Polaris 90-190; Asahi Bellows; Ixus IIs
Projects: Agfa Isolette III (no shutter), Canon AE-1D (no sensor),
Nikon D80 (dead), The "Peace Camera"
AF: Canon, Tokina, Sigma Video: JVC GZ-MG275E |
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visualopsins
Joined: 05 Mar 2009
Posts: 11638
Location: California
Expire: 2027-07-11
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Posted: Sun Aug 17, 2025 8:27 pm Post subject: |
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Posted: Sun Aug 17, 2025 8:27 pm Post subject: |
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visualopsins wrote:
| kansalliskala wrote: |
| visualopsins wrote: |
| DIY? Burkit M1.8 X 0.35 Tap and Die Set, M1.8 x 0.35 Machine Thread Tap and Round Die Right Hand |
diy 1,8 mm screws
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Fixed. Thanks!
https://www.amazon.com/Burkit-Machine-Thread-Round-Right/dp/B09ZTT736L
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Solinon 1:5.6/18 ASPH.
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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marcusBMG
Joined: 07 Dec 2012
Posts: 1387
Location: Conwy N Wales
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Posted: Mon Aug 25, 2025 11:51 am Post subject: |
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Posted: Mon Aug 25, 2025 11:51 am Post subject: |
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marcusBMG wrote:
Thanks visualopsins. That's the body of a tokina 2x tc, cut down and fitted with the ad mount off a fungussed 80-210mm. It was a bit finicky because the pentacon has a prominent raised ridge on its mount, I had to shape an acrylic disk to fit over that.
And the substitute mounts for takumar 500mm and 1000mm are done too.
I made 4 of these so three available to interested persons, who would like the facility of adaptall-ising their 500mm f4.5 or 1000mm f8, easy adaption to any camera, use the tamron adaptall 02F eyepiece adapter and have a nice big scope.
Pic 2 shows the sub mount next to the mount off my K 1000mm. AFAIK the mounts are essentially the same, taks and K series, K series are K bayonet of course
.
_________________
pentax ME super (retired)
Pentax K3-ii; pentax K-S2; Samsung NX 20; Lumix G1 + adapters;
Adaptall collection (proliferating!) inc 200-500mm 31A, 300mm f2.8, 400mm f4.
Primes: takumar 55mm; smc 28mm, 50mm; kino/komine 28mm f2's, helios 58mm, Tamron Nestar 400mm, novoflex 400mm, Vivitar 135mm close focus, 105mm macro; Jupiter 11A; CZJ 135mm.
A classic zoom or two: VS1 (komine), Kiron Zoomlock... |
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HansMoleman
Joined: 12 Jul 2019
Posts: 217
Location: MD USA
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Posted: Mon Aug 25, 2025 3:17 pm Post subject: |
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Posted: Mon Aug 25, 2025 3:17 pm Post subject: |
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HansMoleman wrote:
If you are able to apply sufficient torque for the application Loctite 222MS (purple) for small (under 1/4"/6MM) fasteners will adequately fill gaps up to .2MM when used correctly. |
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marcusBMG
Joined: 07 Dec 2012
Posts: 1387
Location: Conwy N Wales
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Posted: Mon Sep 01, 2025 8:19 pm Post subject: |
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Posted: Mon Sep 01, 2025 8:19 pm Post subject: |
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marcusBMG wrote:
My small dies arrived from China - M1.8 and a M1.7. I filed down a M2.5 12mm bolt using my drill press and a small "warding" flat file and rethreaded it M1.8 - success. But the fit of the bolt was just too tight - M1.7 after all not M1.8, fortunately I had had the wit to get that die too. So I successfully took the M1.8 down to M1.7 (same pitch) and replaced the missing bolt. Then I tried to take down a second one and ....disaster. The bolt snapped leaving a stub jammed in the die. Didn't have the wit to get two of each of them while I was at it, should have done they were that cheap.
Any ideas to get out the snapped off stub?
The dies are just 11.9mm across (15/32"), I made a holder out of a small piece of 6mm polycarbonate sheet. Rather than attemp to turn the die on the bolt shank, I used a screwdriver to screw the bolt into the die.
I decided to rethread the screw holes on the adapter I made for the pentacon 500mm for M2 bolts, that worked fine.
_________________
pentax ME super (retired)
Pentax K3-ii; pentax K-S2; Samsung NX 20; Lumix G1 + adapters;
Adaptall collection (proliferating!) inc 200-500mm 31A, 300mm f2.8, 400mm f4.
Primes: takumar 55mm; smc 28mm, 50mm; kino/komine 28mm f2's, helios 58mm, Tamron Nestar 400mm, novoflex 400mm, Vivitar 135mm close focus, 105mm macro; Jupiter 11A; CZJ 135mm.
A classic zoom or two: VS1 (komine), Kiron Zoomlock... |
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visualopsins
Joined: 05 Mar 2009
Posts: 11638
Location: California
Expire: 2027-07-11
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Posted: Tue Sep 02, 2025 3:23 am Post subject: |
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Posted: Tue Sep 02, 2025 3:23 am Post subject: |
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visualopsins wrote:
Heat the die? Somehow screw out broken stub from other side, perhaps with another screw?
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Solinon 1:5.6/18 ASPH.
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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