SMC Pentax 50 mm f1.4 screws size

Kupepe · 10-07-2018, 09:03 AM

Hello I had given my lens for repair as the metal ring in front of the front element, where the SMC Pentax logo ring screws on, around the front element, was loose and it was moving.

Today as I had my lens hood on and was taking pictures the loose issue appeared again and at some point the hood with the SMC logo ring and the metal ring that has the three screws that fits on the lens fell off. I could not find the third screw. The other two where on the metal ring with the screw holes. Came back and screw then back on and now everything is stable again...

Anyone knows what size those screws are and if the are normal screws or something special made for lens?

Penview52 · 10-07-2018, 09:36 AM

You can not buy now just the screws only. What you can do is buy a junk camera where in you can get screws of same size. Just leave it unscrewed for one, it will still work.

robiles · 10-07-2018, 10:02 AM

Maybe use a bit of loctite (or how's it called) so they dont unscrew anymore.

Kupepe · 10-07-2018, 10:06 AM

So no chance to find them at generic sizes of screws ?

Not a Number · 10-07-2018, 10:16 AM - **1 Like**

As I recall Asahi likes using 1.7mm diameter screws for most of their lenses. The parts list for the 50mm f1.7 shows M1.7 × 4 (1.7mm diameter by 4 mm long). With small screws like these the thread pitch is standard to the diameter so you don't have to know the pitch.

Search on "micro screws" or the specific size to find several sources that sells small screws. You want pan head screws.

Kupepe · 10-07-2018, 10:17 AM

Originally posted by Not a Number

As I recall Asahi likes using 1.7mm diameter screws for most of their lenses. The parts list for the 50mm f1.7 shows M1.7 × 4 (1.7mm diameter by 4 mm long). With small screws like these the thread pitch is standard to the diameter so you don't have to know the pitch.

Search on "micro screws" or the specific size to find several sources that sells small screws.

Thank you ... Will look into it tonight tomorrow

**dean45** · 10-07-2018, 11:27 AM

I got a screw to hold the front ring for a Pentax lens from a old Hard drive.

Dean Sturgis

VSTAR · 10-07-2018, 07:23 PM

Originally posted by Kupepe

Hello I had given my lens for repair as the metal ring in front of the front element, where the SMC Pentax logo ring screws on, around the front element, was loose and it was moving.

Today as I had my lens hood on and was taking pictures the loose issue appeared again and at some point the hood with the SMC logo ring and the metal ring that has the three screws that fits on the lens fell off. I could not find the third screw. The other two where on the metal ring with the screw holes. Came back and screw then back on and now everything is stable again...

Anyone knows what size those screws are and if the are normal screws or something special made for lens?

This may help....eye doctors and stores that sell glasses usually stock extremely small screws for eyeglass repairs. If you get someone who is helpful, they may be able to find a replacement screw for you. Or bring it to me in the Toronto area! Best of luck.

**clickclick** · 10-08-2018, 05:53 AM

Delving into several different lenses resulted in buying a couple different assortments to have common sizes on hand: The M1.7 were hard to find in an assortment, and I had to buy those on their own. Pay attention to head styles!

amazon.com: HVAZI 12 Kinds M1 M1.2 M1.4 M1.6 Small Screws Assortment Kit: Home Improvement?tag=pentaxforums-20&

SNZS-M1.7-5-NBKPan Head Machine Screws for precision instruments: amazon.com: Industrial & Scientific?tag=pentaxforums-20&

amazon.com: Uxcell a15070200ux0006 M2 x 4mm 304 Stainless Steel Phillips Round Head Screws Bolt (Pack of 60): Industrial & Scientific?tag=pentaxforums-20&

10-07-2018, 09:03 AM	#1
Kupepe Forum Member Join Date: Jun 2017 Posts: 51	SMC Pentax 50 mm f1.4 screws size Hello I had given my lens for repair as the metal ring in front of the front element, where the SMC Pentax logo ring screws on, around the front element, was loose and it was moving. Today as I had my lens hood on and was taking pictures the loose issue appeared again and at some point the hood with the SMC logo ring and the metal ring that has the three screws that fits on the lens fell off. I could not find the third screw. The other two where on the metal ring with the screw holes. Came back and screw then back on and now everything is stable again... Anyone knows what size those screws are and if the are normal screws or something special made for lens?

10-07-2018, 11:27 AM	#7
dean45 Site Supporter Join Date: Mar 2012 Location: Minnesota Photos: Gallery Posts: 31	screws for lens I got a screw to hold the front ring for a Pentax lens from a old Hard drive. Dean Sturgis

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10-07-2018, 09:36 AM	#2
Penview52 Veteran Member Join Date: Apr 2017 Photos: Albums Posts: 327	You can not buy now just the screws only. What you can do is buy a junk camera where in you can get screws of same size. Just leave it unscrewed for one, it will still work.

10-07-2018, 10:02 AM	#3
robiles Veteran Member Join Date: Jan 2014 Location: Deva Posts: 311	Maybe use a bit of loctite (or how's it called) so they dont unscrew anymore.

10-07-2018, 10:06 AM	#4
Kupepe Forum Member Join Date: Jun 2017 Posts: 51 Original Poster	So no chance to find them at generic sizes of screws ?

10-07-2018, 10:16 AM - 1 Like	#5
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,526	As I recall Asahi likes using 1.7mm diameter screws for most of their lenses. The parts list for the 50mm f1.7 shows M1.7 × 4 (1.7mm diameter by 4 mm long). With small screws like these the thread pitch is standard to the diameter so you don't have to know the pitch. Search on "micro screws" or the specific size to find several sources that sells small screws. You want pan head screws.

10-07-2018, 10:17 AM	#6
Kupepe Forum Member Join Date: Jun 2017 Posts: 51 Original Poster	Originally posted by Not a Number As I recall Asahi likes using 1.7mm diameter screws for most of their lenses. The parts list for the 50mm f1.7 shows M1.7 × 4 (1.7mm diameter by 4 mm long). With small screws like these the thread pitch is standard to the diameter so you don't have to know the pitch. Search on "micro screws" or the specific size to find several sources that sells small screws. Thank you ... Will look into it tonight tomorrow

10-07-2018, 07:23 PM	#8
VSTAR Veteran Member Join Date: Mar 2010 Location: Toronto Posts: 390	Originally posted by Kupepe Hello I had given my lens for repair as the metal ring in front of the front element, where the SMC Pentax logo ring screws on, around the front element, was loose and it was moving. Today as I had my lens hood on and was taking pictures the loose issue appeared again and at some point the hood with the SMC logo ring and the metal ring that has the three screws that fits on the lens fell off. I could not find the third screw. The other two where on the metal ring with the screw holes. Came back and screw then back on and now everything is stable again... Anyone knows what size those screws are and if the are normal screws or something special made for lens? This may help....eye doctors and stores that sell glasses usually stock extremely small screws for eyeglass repairs. If you get someone who is helpful, they may be able to find a replacement screw for you. Or bring it to me in the Toronto area! Best of luck.

10-08-2018, 05:53 AM	#9
clickclick Loyal Site Supporter Join Date: May 2016 Location: East Coast Posts: 2,903	Delving into several different lenses resulted in buying a couple different assortments to have common sizes on hand: The M1.7 were hard to find in an assortment, and I had to buy those on their own. Pay attention to head styles! amazon.com: HVAZI 12 Kinds M1 M1.2 M1.4 M1.6 Small Screws Assortment Kit: Home Improvement?tag=pentaxforums-20& SNZS-M1.7-5-NBKPan Head Machine Screws for precision instruments: amazon.com: Industrial & Scientific?tag=pentaxforums-20& amazon.com: Uxcell a15070200ux0006 M2 x 4mm 304 Stainless Steel Phillips Round Head Screws Bolt (Pack of 60): Industrial & Scientific?tag=pentaxforums-20&